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    Wyświetlanie 1-29 z 29
    Tytuł:
    Navigational decision support system during approach manoeuvre in emergency STS transfer operation
    Autorzy:
    Witkowska, A.
    Śmierzchalski, R.
    Wilczyński, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2068876.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
    Tematy:
    lightering
    trajectory planning
    approach manoeuver
    Opis:
    The paper is concerned with the problem of safe trajectory planning for approaching during emergency STS (Ship to Ship) transfer operation with oil spill. The safe trajectory means that the way points does not cross in the area of the environment with the static and dynamic obstacles and at the same time satisfies ship's stopping and speed deceleration performance. The evolutionary path planning algorithm is used to determine trajectory designed as way points and straight line segments between them. The way points - ship positions and velocity can be treated as reference value to support navigator in decision making during Approach Manoeuvre and to mitigate the risk of collision which mostly results from exceed velocity of approaching. The task of trajectory planning is defined as constant optimization process to minimize trajectory length, course alteration and maximize safety in a navigational environment. This paper examines exemplary navigational scenario based on emergency STS accident.
    Źródło:
    Journal of Polish Safety and Reliability Association; 2017, 8, 1; 175--182
    2084-5316
    Pojawia się w:
    Journal of Polish Safety and Reliability Association
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Trajectory planning for kinematically redundant robots using jacobi matrix – an industrial implementation
    Autorzy:
    Walther, M.
    Sewohl, A.
    Schlegel, H.
    Neugebauer, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/99976.pdf
    Data publikacji:
    2017
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    redundant robots
    trajectory planning
    jacobian matrix
    pseudoinverse
    Opis:
    The widespread use of robots in industry contributes significantly to high productivity. Serial 6-axis robots are used in large quantities, e.g. for assembly or welding. A current emerging trend is the use of robots for classic tasks of a machine tool like finishing of milled workpieces. For such applications, standard robots are usually extended by additional axes like linear axes or rotary tilting tables. Therefore, the overall system becomes kinematically redundant. To be able to calculate the axis quantities via inverse kinematics for a given path, additional degrees of freedom must be bound. In order to automatically and optimally consider the additional axis motion a method, using the pseudoinverse of the Jacobian matrix, is discussed. Due to the dependence of the Jacobi matrix on the robot's current joint position, numerical inaccuracies, which in turn reflect a path error, are inherent to this method. By feedback control of the path error, in the form of a classic control loop, the error can be reduced so that a practical implementation on industrial robot controller is possible. In the article possibilities for parameterisation of the algorithm as well as proof of stability of the closed loop are presented. The results obtained are verified by a concrete application.
    Źródło:
    Journal of Machine Engineering; 2017, 17, 3; 24-35
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Data Acquisition in a Manoeuver Auto-negotiation System
    Autorzy:
    Szlapczynska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/116788.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Trajectory Planning with Negotiation
    Trajectory Planning
    Negotiation
    Auto-Negotiation System
    Data Acquisition, Manoeuvering
    vessel traffic service (VTS)
    Collision Avoidance
    Opis:
    Typical approach to collision avoidance systems with artificial intelligence support is that such systems assume a central communication and management point (such as e.g. VTS station), usually located on shore. This approach is, however, not applicable in case of an open water encounter. Thus, recently a new approach towards collision avoidance has been proposed, assuming that all ships in the encounter, either restricted or open water, communicate with each other and negotiate their maneuvers, without involving any outer management or communication center. Usually the negotiation process is driven by the collision avoidance software and called auto-negotiation. This paper elaborates on data acquisition problem in case of the maneuver auto-negotiation. It focuses on ships' initialization in the system and data gathering.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2015, 9, 3; 343-348
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Continuous-curvature trajectory planning
    Autorzy:
    Roth, Jörg
    Powiązania:
    https://bibliotekanauki.pl/articles/1837365.pdf
    Data publikacji:
    2021
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    mobile robot
    trajectory planning
    continuous-curvature paths
    clothoid
    Opis:
    Continuous-curvature paths play an important role in the area of driving robots: as vehicles usually cannot change the steering angle in zero-time, real trajectories must not have discontinuities in the curvature profile. Typical continuous-curvature paths are thus built of straight lines, arcs and clothoids. Due to the geometric nature of clothoids, some questions in the area of trajectory planning are difficult the answer – usually we need approximations here. In this paper we describe a full approach for continuous-curvature trajectory planning for mobile robots – it covers a maneuver-based planning with Viterbi optimization and geometric approximations required to construct the respective clothoid trajectories.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2021, 15, 1; 9-23
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Trajectory planning for narrow environments that require changes of driving directions
    Autorzy:
    Roth, Jörg
    Powiązania:
    https://bibliotekanauki.pl/articles/2141777.pdf
    Data publikacji:
    2021
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    mobile robot
    navigation
    trajectory planning
    complex turning situations
    Opis:
    In the area of mobile robotics, trajectory planning is the task to find a sequence of primitive trajectories that connect two configurations, whereas non-holonomic constraints, obstacles and driving costs have to be considered. In this paper, we present an approach that is able to handle situations that require changes of driving directions. In such situations, optimal trajectory sequences contain costly turning maneuvers – sometimes not even on the direct path between start and target. These situations are difficult for most optimization approaches as the robot partly has to drive paths with higher cost values that seem to be disadvantageous. We discuss the problem in depth and provide a solution that is based on maneuvers, partial backdriving and free-place discovery. We applied the approach on top of our Viterbi-based trajectory planner.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2021, 15, 4; 18-29
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Algorithms and calculation scheme for planning the way of movement of trajectory point during maneuvering for anchoring
    Autorzy:
    Surinov, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2063956.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    algorithms for planning ships trajectories
    planning the way of movement
    algorithms
    maneuvering for anchoring
    route planning
    ship’s trajectory planning
    algorithms for ships trajectories
    trajectory planning
    Opis:
    The analysis of the historical aspect of the development of the maneuvering during anchoring shows that during the movement there is no time to control the position by technical means, due to the speed of the process of changing the parameters of movement. The main purpose of this research is to modify the methodological basis for the preparation of flight planning during anchoring with increased accuracy to determine the coordinates along which the ship will move. The methodology of this work is based on the calculation of trajectory points of the path in combination with the method of segments on the map using the characteristics of the maneuverability of the vessel. The method is based on determining the coordinate matrices of rectilinear and curvilinear sections through which the vessel passes during maneuvering for anchoring. The calculation program is developed in Excel, and allows without the help of a micro calculator that takes into account the maneuverability of the vessel in the automatic system. Thus, the control of the center of gravity of the vessel relative to a given path line is performed. A high-precision system for automatic determination of planned coordinates by trajectory points on track and traffic control during anchoring has been developed, which is based on recently developed algorithms, calculation schemes and methods at the Maritime University, which are based on the latest meaningful models of high-precision planning movement on them. This approach automates the process of controlling safe traffic, including the use of decision support systems, including stranding prevention and collisions with other vessels. The results of the research can be used on a ship for automated planning of coordinates on waypoints and control of traffic on them for safe maneuvering, as well as for training navigators on specialized simulators to perform trajectory planning, including limited conditions.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2021, 15, 3; 629--638
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Verification of ships trajectory planning algorithms using real navigational data
    Autorzy:
    Lazarowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/117103.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Visibility Graph-search Algorithm (VGA)
    Discrete Artificial Potential Field (DAPF)
    real navigational data
    ARPA
    ship's trajectory planning
    ship's trajectory planning algorithms
    Ant Colony Optimization (ACO)
    Trajectory Base Algorithm (TBA)
    Opis:
    The paper presents results of ship's safe trajectory planning algorithms verification. Real navigational data registered from a radar with an Automatic Radar Plotting Aid on board the research and training ship Horyzont II were used as input data to the algorithms. The algorithms verified in the presented research include the Ant Colony Optimization algorithm (ACO), the Trajectory Base Algorithm (TBA), the Visibility Graph-search Algorithm (VGA) ant the Discrete Artificial Potential Field algorithm (DAPF). Details concerning data registration and exemplary results obtained with the use or real navigational data are introduced and summarized in the paper. Presented results prove the applicability of proposed algorithms for solving the ship's safe trajectory planning problem.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2019, 13, 3; 559-564
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of ship’s trajectory planning in collision situations by hybrid genetic algorithm
    Autorzy:
    Ni, S.
    Liu, Z.
    Cai, Y.
    Wang, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/259640.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    trajectory planning
    Multiple Genetic Algorithm
    ship collision avoidance
    nonlinear programming
    COLREGs
    Opis:
    Ship collision-avoidance trajectory planning aims at searching for a theoretical safe-critical trajectory in accordance with COLREGs and good seamanship. In this paper, a novel optimal trajectory planning based on hybrid genetic algorithm is presented for ship collision avoidance in the open sea. The proposed formulation is established based on the theory of the Multiple Genetic Algorithm (MPGA) and Nonlinear Programming, which not only overcomes the inherent deficiency of the Genetic Algorithm (GA) for premature convergence, but also guarantees the practicality and consistency of the optimal trajectory. Meanwhile, the encounter type as well as the obligation of collision avoidance is determined according to COLREGs, which is then considered as the restricted condition for the operation of population initialization. Finally, this trajectory planning model is evaluated with a set of test cases simulating various traffic scenarios to demonstrate the feasibility and superiority of the optimal trajectory.
    Źródło:
    Polish Maritime Research; 2018, 3; 14-25
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Trajectory Planning with Negotiation for Maritime Collision Avoidance
    Autorzy:
    Hornauer, S.
    Hahn, A.
    Blaich, M.
    Reuter, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/116268.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Trajectory Planning
    Negotiation
    route planning
    Collision Avoidance
    vessel traffic service (VTS)
    Expert Knowledge
    COLREGs
    Opis:
    The problem of vessel collisions or near-collision situations on sea, often caused by human error due to incomplete or overwhelming information, is becoming more and more important with rising maritime traffic. Approaches to supply navigators and Vessel Traffic Services with expert knowledge and suggest trajectories for all vessels to avoid collisions, are often aimed at situations where a single planner guides all vessels with perfect information. In contrast, we suggest a two-part procedure which plans trajectories using a specialised A* and negotiates trajectories until a solution is found, which is acceptable for all vessels. The solution obeys collision avoidance rules, includes a dynamic model of all vessels and negotiates trajectories to optimise globally without a global planner and extensive information disclosure. The procedure combines all components necessary to solve a multi-vessel encounter and is tested currently in simulation and on several test beds. The first results show a fast converging optimisation process which after a few negotiation rounds already produce feasible, collision free trajectories.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2015, 9, 3; 335-341
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Trajectory planning of end-effector with intermediate point
    Planowanie trajektorii ruchu chwytaka z punktem pośrednim
    Autorzy:
    Graboś, A.
    Boryga, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1366160.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    planowanie trajektorii
    chwytak
    wielomianowy profil przyspieszenia
    udar
    trajectory planning
    polynomial acceleration profile
    jerk
    Opis:
    The article presents the Polynomial Cross Method (PCM) for trajectory planning of an end-effector with an intermediate point. The PCM is applicable for designing robot end-effector motion, whose path is composed of two rectilinear segments. Acceleration profile on both segments was described by the 7th-degree polynomial. The study depicts an algorithm for the method and the research results presented as the runs of resultant velocity, acceleration and linear jerk of the stationary coordinate system.
    W pracy zaprezentowano metodę PCM (Polynomial Cross Method) do planowania trajektorii ruchu chwytaka z punktem pośrednim. PCM ma zastosowanie do planowania ruchu chwytaka, którego tor składa się z dwóch odcinków prostoliniowych. Profil przyspieszenia na obu odcinkach opisany został wielomianem siódmego stopnia. W pracy przedstawiono algorytm metody oraz wyniki w postaci przebiegów prędkości, przyspieszenia i udaru liniowego.
    Źródło:
    Eksploatacja i Niezawodność; 2013, 15, 2; 182-187
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A trajectory planning based controller to regulate an uncertain 3D overhead crane system
    Autorzy:
    Aguilar-Ibanez, Carlos
    Suarez-Castanon, Miguel S.
    Powiązania:
    https://bibliotekanauki.pl/articles/330904.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    overhead crane
    adaptive control
    trajectory planning
    Barbalat's lemma
    suwnica pomostowa
    sterowanie adaptacyjne
    planowanie trajektorii
    Opis:
    We introduce a control strategy to solve the regulation control problem, from the perspective of trajectory planning, for an uncertain 3D overhead crane. The proposed solution was developed based on an adaptive control approach that takes advantage of the passivity properties found in this kind of systems. We use a trajectory planning approach to preserve the accelerations and velocities inside of realistic ranges, to maintaining the payload movements as close as possible to the origin. To this end, we carefully chose a suitable S-curve based on the Bezier spline, which allows us to efficiently handle the load translation problem, considerably reducing the load oscillations. To perform the convergence analysis, we applied the traditional Lyapunov theory, together with Barbalat’s lemma. We assess the effectiveness of our control strategy with convincing numerical simulations.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2019, 29, 4; 693-702
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Planning of collision-free trajectory for mobile manipulators
    Autorzy:
    Pająk, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/265205.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    mobilny manipulator
    planowanie trajektorii
    mobile manipulator
    path following
    trajectory planning
    penalty function
    control constraints
    Opis:
    A method of planning sub-optimal trajectory for a mobile manipulator working in the environment including obstacles is presented. The path of the end-effector is defined as a curve that can be parameterized by any scaling parameter, the reference trajectory of a mobile platform is not needed. Constraints connected with the existence of mechanical limits for a given manipulator configuration, collision avoidance conditions and control constraints are considered. The motion of the mobile manipulator is planned in order to maximize the manipulability measure, thus to avoid manipulator singularities. The method is based on a penalty function approach and a redundancy resolution at the acceleration level. A computer example involving a mobile manipulator consisting of a nonholonomic platform and a SCARA type holonomic manipulator operating in a two-dimensional task space is also presented.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2013, 18, 2; 475-489
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Motion planning for mobile surgery assistant
    Autorzy:
    Pajak, G.
    Pajak, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/306369.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    mobile manipulator
    path following
    trajectory planning
    surgery assistant
    manipulator mobilny
    planowanie trajektorii
    śledzenie ścieżki
    Opis:
    The paper presents a method of motion planning for a mobile manipulator acting as a helper providing the necessary tools or a surgery assistant carrying out pre-planned procedures. Mobility of this system makes it possible to reach the position which will give optimal access to the operating field. The path of the end-effector, determined during operation pre-planning, is defined as a curve parameterized by any scaling parameter, the reference trajectory of a mobile platform is not needed. The motion of the mobile manipulator is planned in order to maximise the manipulability measure, thus to avoid manipulator singularities. The method is based on a penalty function approach and a redundancy resolution at the acceleration level. Constraints connected with the existence of mechanical limits for a given manipulator configuration, collision avoidance conditions and control constraints are considered. A computer example involving a mobile manipulator consisting of a nonholonomic platform (2,0) class and a 3 DOF RPR type holonomic manipulator operating in a three-dimensional task space is also presented.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2014, 16, 2; 11-20
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Trajectory planning for tractor turning using the trigonometric transition curve
    Planowanie trajektorii nawrotu ciągnika z wykorzystaniem trygonometrycznej krzywej przejściowej
    Autorzy:
    Boryga, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/11541884.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Inżynierii Rolniczej
    Tematy:
    trajectory planning
    headland maneuvers
    trigonometric transition curve
    smooth trajectory
    planowanie trajektorii
    manewry na uwrociach
    trygonometryczna krzywa przejściowa
    trajektoria gładka
    Opis:
    This paper presents a method of utilizing a transition curve in planning the movement trajectory of agricultural machinery during the headland turns. The approach involves using the transition curve, whose curvature and tangent angle are described by the trigonometric function. For the designed course, the kinematic quantities, wheel turning angles, and their rates of change were determined for two models of agricultural tractors. The algorithm proposed in this study ensures continuity and smooth changes in the kinematic quantities and can be applied to the trajectory planning of agricultural implements and machines, autonomous vehicles, mobile robots, manipulators, and CNC machines.
    W pracy przedstawiono sposób wykorzystania krzywej przejściowej w planowaniu trajektorii ruchu maszyn rolniczych podczas jazdy na uwrociu. Zaplanowano zastosowanie krzywej przejściowej, której krzywizna i kąt stycznej do krzywej opisane są funkcją trygonometryczną. Dla zaplanowanego toru jazdy wyznaczono przebiegi wielkości kinematycznych oraz kąty skręcenia kół i prędkości ich zmian dla dwóch modeli ciągnika rolniczego. Zaproponowany w pracy algorytm, zapewnia ciągłość oraz łagodne zmiany wielkości kinematycznych i może być stosowany do planowania trajektorii ruchu agregatów i maszyn rolniczych, pojazdów autonomicznych, robotów mobilnych, manipulatorów i maszyn CNC.
    Źródło:
    Agricultural Engineering; 2023, 27, 1; 203--212
    2083-1587
    Pojawia się w:
    Agricultural Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fast and smooth trajectory planning for a class of linear systems based on parameter and constraint reduction
    Autorzy:
    Liu, Guangyu
    Wu, Shangliang
    Zhu, Ling
    Wang, Jiajun
    Lv, Qiang
    Powiązania:
    https://bibliotekanauki.pl/articles/2055148.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    constraint reduction
    parameter reduction
    fast calculation
    trajectory planning
    redukcja ograniczeń
    redukcja parametrów
    szybka kalkulacja
    planowanie trajektorii
    Opis:
    Fast and smooth trajectory planning is crucial for modern control systems, e.g., missiles, aircraft, robots and AGVs. However, classical spline based trajectory planning tools introduce redundant constraints and parameters, leading to high costs of computation and complicating fast and smooth execution of trajectory planning tasks. A new tool is proposed that employs truncated power functions to annihilate some constraints and reduce the number of parameters in the optimal model. It enables solving a simplified optimal problem in a shorter time while keeping the trajectory sufficiently smooth. With an engineering background, our case studies show that the proposed method has advantages over other solutions. It is promising in regard to the demanding tasks of trajectory planning.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2022, 32, 1; 11--21
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Planowanie trajektorii ruchu zespołu robotów mobilnych z zastosowaniem metody warstwicowej
    Motion trajectory planning of multi-robot team using contour line method
    Autorzy:
    Kowalczuk, Z.
    Duzinkiewicz, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/153784.pdf
    Data publikacji:
    2008
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    planowanie trajektorii
    zespoły robotów
    metoda sztucznego potencjału
    trajectory planning
    multi-robot teams
    artificial potential field method
    Opis:
    Podstawową część artykułu stanowi opis zaproponowanej przez autorów metody planowania trajektorii ruchu dla zespołu autonomicznych robotów mobilnych poruszających się w określonym szyku. Zastosowano w tym celu zmodyfikowaną metodę sztucznego potencjału , nazwaną przez autorów metodą warstwicową. Przedstawiona procedura jest wieloetapowa. Każdy z etapów został opisany z zastosowaniem odpowiednich schematów proceduralnych, zaś wyniki działania każdego z algorytmów składowych zostały zilustrowane wykresami pochodzącymi z symulacji komputerowych.
    The purpose of the paper is to introduce a multi-stage trajectory planning algorithm for mobile robots. Unmanned Ground Vehicles (UGVs) and Unmanned Aerial Vehicles (UAVs) became very popular in the last few years. Many military and civil applications can be found in real life. One of the most challenging issues regarding UGVs and UAVs concern their autonomous control in environment with obstacles. The proposed algorithm is based on a contour line method, modification of the artificial potential field method designed to efficiently escape local minima of the artificial potential function.
    Źródło:
    Pomiary Automatyka Kontrola; 2008, R. 54, nr 3, 3; 140-144
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Collision-Free Trajectory Planning for Mobile Manipulators Subject to Control Constraints
    Planowanie bezkolizyjnej trajektorii manipulatorów mobilnych przy ograniczeniach na sterowania
    Autorzy:
    Pajak, G.
    Pajak, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/139950.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mobile manipulator
    path following
    trajectory planning
    penalty function
    control constraints
    manipulator mobilny
    planowanie trajektorii
    funkcja kary
    Opis:
    A method of planning collision-free trajectory for a mobile manipulator tracking a line section path is presented. The reference trajectory of a mobile platform is not needed, mechanical and control constraints are taken into account. The method is based on a penalty function approach and a redundancy resolution at the acceleration level. Nonholonomic constraints in a Pfaffian form are explicitly incorporated to the control algorithm. The problem is shown to be equivalent to some point-to-point control problem whose solution may be easier determined. The motion of the mobile manipulator is planned in order to maximise the manipulability measure, thus to avoid manipulator singularities. A computer example involving a mobile manipulator consisting of a nonholonomic platform (2,0) class and a 3 DOF RPR type holonomic manipulator operating in a three-dimensional task space is also presented.
    W pracy opisano tok postępowania podczas budowy modeli symulacyjnych z wykorzystaniem programu SolidWorks i Matlab/Simulink. Tworzenie modelu symulacyjnego przebiega etapami, to znaczy najpierw opracowywany jest model geometryczny w programie SolidWorks, następnie dzięki możliwości wymiany danych, model CAD jest implementowany w środowisku obliczeniowym Matlab/Simulink. Modele SimMechanics pozwalają na śledzenie wielu parametrów, np. trajektorii, prędkości, czy przyspieszeń dowolnych elementów układu złożonego. W pracy, jako przykłady modeli symulacyjnych opracowanych zgodnie z zaprezentowana metoda, pokazano modele laboratoryjnego żurawia samochodowego oraz żurawia leśnego. Modele te umożliwiają wizualizacje zadanego - za pomocą wymuszeń kinematycznych - cyklu pracy.
    Źródło:
    Archive of Mechanical Engineering; 2014, LXI, 1; 35-55
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The agent, state-space model of the mobile robot
    Agentowy model robota mobilnego w przestrzeni stanu
    Autorzy:
    Oprzędkiewicz, K.
    Ciurej, M.
    Garbacz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/275765.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    mobile robot
    trajectory planning
    agent model
    design pattern
    Braitenberg algorithm
    robot mobilny
    planowanie trajektorii
    model agentowy
    wzorce projektowe
    algorytm Braitenberga
    Opis:
    The paper is devoted to present a new agent model of wheeled mobile robot. The proposed model based on nonlinear state space, discrete model of kinematics and employes Braitenberg algorithm to control the robot during move to target with passing obstacles. As a real robot the Khepera robot with IR proximity sensors was considered. The proposed agent model can be generalized onto another similar classes of devices. Results of experiments show that the proposed model correctly describes the behaviour of real device during realization of different jobs, for example obstacle passing.
    W artykule zaprezentowano nowy model agentowy kołowego robota mobilnego. Proponowany model bazuje na nieliniowym równaniu stanu opisującym kinematykę robota i wykorzystuje algorytm Braitenberga z zadanym punktem końcowym w celu omijania przeszkód. Jako przykład rzeczywistego robota rozważono robot Khepera III z czujnikami IR do wykrywania i omijania przeszkód. Zaproponowany model agentowy może być uogólniony na inne klasy podobnych urządzeń. Wyniki symulacji pokazują, że zaproponowany model dobrze opisuje zachowanie się rzeczywistego urządzenia podczas realizacji różnych zadań, np. przy omijaniu przeszkód.
    Źródło:
    Pomiary Automatyka Robotyka; 2018, 22, 3; 41-50
    1427-9126
    Pojawia się w:
    Pomiary Automatyka Robotyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi-criteria ACO-based algorithm for ship’s trajectory planning
    Autorzy:
    Lazarowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/116548.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    colregs
    ships manoeuvering
    Ant Colony Optimization (ACO)
    ship’s trajectory planning
    route planning
    multi-criteria ACO-based algorithm
    guidance
    navigation and control (GNC)
    ARPA
    Opis:
    The paper presents a new approach for solving a path planning problem for ships in the environment with static and dynamic obstacles. The algorithm utilizes a heuristic method, classified to the group of Swarm Intelligence approaches, called the Ant Colony Optimization. The method is inspired by a collective behaviour of ant colonies. A group of agents - artificial ants searches through the solution space in order to find a safe, optimal trajectory for a ship. The problem is considered as a multi-criteria optimization task. The criteria taken into account during problem solving are: path safety, path length, the International Regulations for Preventing Collisions at Sea (COLREGs) compliance and path smoothness. The paper includes the description of the new multi-criteria ACO-based algorithm along with the presentation and discussion of simulation tests results.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2017, 11, 1; 31-36
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of the obstacle vector field method for trajectory planning of a planar manipulator in simulated microgravity
    Autorzy:
    Rybus, Tomasz
    Aleksiejuk, Konrad
    Basmadji, Fatina Liliana
    Sikorski, Adam
    Powiązania:
    https://bibliotekanauki.pl/articles/27314465.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Centrum Badań Kosmicznych PAN
    Tematy:
    collision-free trajectory planning
    obstacle vector field
    OVF
    method, active debris removal
    ADR
    free-floating manipulator
    planar air-bearing microgravity symulator
    Opis:
    Capture and removal of large space debris is needed to prevent the growth of the debris population in low Earth orbit. Capture of a non-cooperative object by a manipulator mounted on a chaser satellite requires collision-free trajectory of the manipulator. The obstacle vector field (OVF) method allows to solve the trajectory planning problem in difficult scenarios. The OVF method is based on a vector field that surrounds the obstacles and generates virtual forces that drive the manipulator around the obstacles. The original formulation of the OVF method allows to obtain the desired position of the gripper, but not the desired orientation. To perform the grasping manoeuvre, the gripper has to be positioned in a specific point and aligned with the grasping interface. In this paper, we propose a modification to the OVF method that allows to obtain the desired position and orientation of the gripper. Moreover, we investigate the practical applicability of the OVF method. The OVF method is demonstrated in experiments performed on a planar air-bearing microgravity simulator. The presented results prove that the OVF method can be applied for a real system operating in simulated microgravity conditions.
    Źródło:
    Artificial Satellites. Journal of Planetary Geodesy; 2023, 58, Special Issue 1; 171--187
    2083-6104
    Pojawia się w:
    Artificial Satellites. Journal of Planetary Geodesy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Trajectory Planning for Mobile Manipulators with Control Constraints
    Planowanie trajektorii dla manipulatorów mobilnych z ograniczeniami na sterowania
    Autorzy:
    Pająk, Grzegorz
    Pająk, Iwona
    Powiązania:
    https://bibliotekanauki.pl/articles/27312424.pdf
    Data publikacji:
    2023
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    mobile robots
    trajectory planning
    state constraints
    control constraints
    obstacle avoidance
    roboty mobilne
    planowanie trajektorii
    ograniczenia na stan
    ograniczenia na sterowanie
    unikanie kolizji
    Opis:
    This paper presents the method of trajectory planning for mobile manipulators considering limitations resulting from capabilities of robotic system actuators. The fulfillment of control constraints is achieved by introducing virtual control scaling of the robot trajectory in the limited periods of time. Such an approach allows researchers to obtain the trajectories fulfilling control constraints without significantly increasing the time of task execution. The proposed method generates sub-optimal trajectories maximizing the manipulability measure of the robot arm, preserves mechanical and collision avoidance limitations and can be used in real-time trajectory planning. The effectiveness of the presented solution is confirmed by computer simulations involving a mobile manipulator with parameters corresponding to KUKA youBot.
    W pracy przedstawiono metodę planowania trajektorii dla manipulatorów mobilnych uwzględniającą ograniczenia wynikające z możliwości układów napędowych robota. Spełnienie ograniczeń na sterowana zostało osiągnięte poprzez wprowadzenie wirtualnego sterowania skalującego trajektorię robota w ograniczonych przedziałach czasu. Takie podejście pozwoliło na uzyskanie trajektorii spełniających ograniczenia na sterowania bez znaczącego wydłużenia czasu realizacji zadania. Zaproponowana metoda generuje sub-optymalne trajektorie maksymalizując miarę manipulowalności ramienia robota, zachowuje ograniczenia mechaniczne oraz warunki unikania kolizji i może być zastosowana do planowania trajektorii w czasie rzeczywistym. Skuteczność zaproponowanego rozwiązania została potwierdzona symulacjami komputerowymi wykonanymi z użyciem mobilnego manipulatora o parametrach odpowiadających robotowi KUKA youBot.
    Źródło:
    Pomiary Automatyka Robotyka; 2023, 27, 2; 21--30
    1427-9126
    Pojawia się w:
    Pomiary Automatyka Robotyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An offline path planning method for autonomous vehicles
    Autorzy:
    Barsi, Á.
    Nyerges, Á.
    Potó, V.
    Tihanyi, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/111781.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    connected and automated vehicles
    autonomous driving
    self-driving vehicles
    trajectory planning
    path planning
    sterowanie pojazdem
    zautomatyzowany pojazd
    pojazdy samojezdne
    planowanie trajektorii
    planowanie ścieżki
    planowanie trasy
    pojazd autonomiczny
    Opis:
    Driving a road vehicle is a very complex task in terms of controlling it, substituting a human driver with a computer is a real challenge also from the technical side. An important step in vehicle controlling is when the vehicle plans its own trajectory. The input of the trajectory planning are the purpose of the passengers and the environment of the vehicle. The trajectory planning process has several parts, for instance, the geometry of the path-curve or the speed during the way. Furthermore, a traffic situation can also determine many other parameters in the planning process. This paper presents a basic approach for trajectory design. To reach the aim a map will be given as a binary 2204 x 1294 size matrix where the roads will be defined by ones, the obstacles will be defined by zeros. The aim is to make an algorithm which can find the shortest and a suitable way for vehicles between the start and the target point. The vehicle speed will be slow enough to ignore the dynamical properties of the vehicle. The research is one of the first steps to realize automated parking features in a self-drive car.
    Źródło:
    Production Engineering Archives; 2018, 19; 37-42
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evolutionary Ship Track Planning within Traffic Separation Schemes – Evaluation of Individuals
    Autorzy:
    Szłapczyński, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/116089.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    collision avoidance
    Track Planning
    ship trajectory
    Opis:
    The paper presents an extended version of the author’s Evolutionary Sets of Safe Ship Trajectories method. The method plans safe tracks of all ships involved in an encounter including speed reduction maneuvers, if necessary, and taking into account Rule 10 of COLREGS, which specifies ships’ behavior within Traffic Separation Schemes governed by IMO. The paper focuses on the evaluation phase of the evolutionary process and shows how fitness function is designed to compare various possible tracks as well as to assess the quality of a final solution. The impact of the fitness function on the method’s results is illustrated by examples.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2013, 7, 2; 301-308
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Methods of Determining the Safe Ship Trajectory
    Autorzy:
    Lisowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/116647.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    ship route
    Safe Ship Trajectory
    route planning
    Determining the Safe Ship Trajectory
    ship trajectory
    Artificial Neural Network (ANN)
    game theory
    computer simulation
    Opis:
    The paper describes six methods of optimal and game theory and artificial neural network for synthesis of safe control in collision situations at sea. The application of optimal and game control algorithms to determine the own ship safe trajectory during the passing of other encountered ships in good and restricted visibility at sea is presented. The comparison of the safe ship control in collision situation: multi-step matrix non-cooperative and cooperative games, multi-stage positional non-cooperative and cooperative games have been introduced. The considerations have been illustrated with examples of computer simulation of the algorithms to determine safe of own ship trajectories in a navigational situation during passing of eight met ships.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2016, 10, 2; 223-228
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A rational B-Spline curves in robot collision - free movement planning
    Autorzy:
    Reclik, D.
    Kost, G. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/384235.pdf
    Data publikacji:
    2008
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    robot's motion planning
    non-collision trajectory
    NURBS and B-Spline curves
    Opis:
    In this paper there is described the using of 2D robot workspace analysis method with smoothing process by using B-Spline curves [7]. The robot workspace analysis is necessary to generate the collision-free movement paths. This paper is connected with a project, which will be ended with fully functional added application in robot off-line programming. In the last part of this project the authors created the motion planner based on grading function and Markov chains. This planner allows determining the collision-free trajectory of robot bunch. Determining the collision-free trajectory generates a lot of step functions – all movements were possible in only one direction (parallel to Cartesian axes) [1,7]. The worked out planner choose the best path – by shortest movement length or shortest movement time criterion. Achieved path is optimised and smooth by using NURBS and B-Spline curves [2,4,5], which is the main goal of this paper. Smoothing and time-function making is very important, because it allows getting the speed and acceleration data, which are necessary in robot controlling. B-Spline curves fulfil continuous first and second derivate condition. Another advantage of using B-Spline is a possibility to enlarge the movement quality by using the minimal acceleration criteria. This allows growing the steadiness of movement.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2008, 2, 3; 38-42
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling and control of a skid-steering mobile platform with coupled side wheels
    Autorzy:
    Tchoń, K.
    Zadarnowska, K.
    Juszkiewicz, Ł.
    Arent, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/953057.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wheeled mobile platform
    dynamics
    motion planning
    trajectory tracking
    koła
    platforma mobilna
    dynamika
    planowanie ruchu
    śledzenie trajektorii
    Opis:
    This study is devoted to the modeling and control of a 4-wheel, skid-steering mobile platform with coupled side wheels, subject to lateral and longitudinal slips. The dynamics equations of the platform are derived, and 16 variants of motion distinguished. For the variant of motion allowing for all possible slips of the wheels two control problems are addressed: the motion planning problem and the trajectory tracking problem. The former problem is solved by means of a Jacobian motion planning algorithm based on the Endogenous Configuration Space Approach and, complementarily, using the Optimal Control Approach. The Nonlinear Model Predictive Control is applied to the latter problem. Performance of these control algorithms is illustrated by a sort of the parking problem. Significant robustness of the predictive control algorithm against the model uncertainty is revealed.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 3; 807-818
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Route prediction for a person in water drifting in chosen basins using graph theory
    Autorzy:
    Kijewska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/135003.pdf
    Data publikacji:
    2017
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    route prediction
    trajectory prediction
    object movement
    search planning
    survivor
    person in water
    search and rescue
    graph theory
    Opis:
    In this paper, the route prediction for a person in water was performed on the basis of a developed graph algorithm. This person drifted in water under the influence of surface currents and wind. The total drift route for the person in water was established as the route in a weighted directed graph. Vertices of this graph correspond to given points within a given basin. Additionally, the graph’s edges show possible directions of the overall human drift. The weight of the given edge describes the difference between the gradient of the edge and the total drift direction calculated on the basis of surface current field data and wind field data. An application has been created on the basis of a given algorithm which might be used to support the search for survivors in coastal areas (e.g. port basins, basins adjacent to the port, bays and sea areas) for which hydrodynamic models reliably reflect local phenomena.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2017, 50 (122); 45-51
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A graphical model to determine the influence of surface currents on small objects immersed in water
    Autorzy:
    Kijewska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/135216.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    estimating survivor location
    search survivor movement
    object searching
    search planning
    trajectory prediction
    search and rescue
    graph theory
    hydrodynamic models
    Opis:
    This paper proposes a model of the interactions between surface currents and small, moving objects. These objects are immersed in water so that the part extending above the water is no larger than a human head. These interactions are defined as the weighted-directed graph. The basis for determining the edge weights are the directions of the surface currents. The speeds of these currents are used to calculate the time of moving objects. According to the modelling method of the surface-current influence on small objects, presented in this paper, it is possible to implement an application supporting search-and-rescue-operation planning. This method can be used to locate small objects, such as survivors, when planning search-and-rescue operations. Thus, the routes of these objects moving together with surface-water masses can be predicted using this method.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2016, 47 (119); 170-175
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A nature inspired collision avoidance algorithm for ships
    Autorzy:
    Lazarowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/24201448.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    collision avoidance algorithm
    safe own Ship's Trajectory
    safe navigation
    ant colony optimization
    firefly agorithm
    path planning
    swarm intelligence
    nature inspired computing
    Opis:
    Nature inspired algorithms are regarded as a powerful tool for solving real life problems. They do not guarantee to find the globally optimal solution, but can find a suboptimal, robust solution with an acceptable computational cost. The paper introduces an approach to the development of collision avoidance algorithms for ships based on the firefly algorithm, classified to the swarm intelligence methods. Such algorithms are inspired by the swarming behaviour of animals, such as e.g. birds, fish, ants, bees, fireflies. The description of the developed algorithm is followed by the presentation of simulation results, which show, that it might be regarded as an efficient method of solving the collision avoidance problem. Such algorithm is intended for use in the Decision Support System or in the Collision Avoidance Module of the Autonomous Navigation System for Maritime Autonomous Surface Ships.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 2; 341--346
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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