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    Wyświetlanie 1-26 z 26
    Tytuł:
    Machine vibrations with more degrees of freedom
    Autorzy:
    Vondřich, J.
    Thöndel, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1429159.pdf
    Data publikacji:
    2008
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    Matlab
    Simulink
    vibration
    machine
    Opis:
    Rigid mounting of machines to a solid base is one of the requirements for high performance and quality of production. Machine vibrations occur as a result of unbalanced revolving masses, loading forces and moments, starting and coasting of driving motors and other effects. We try to eliminate these undesirable vibrations by suitable mounting of the machine and its parts as much as possible. Suitable mounting of the machine is possible using components such as torsion springs, pneumatic springs, rubber pads or other components. The article describes numerical calculation of optimal displacements the machine for the given his parameters.
    Źródło:
    Journal of Machine Engineering; 2008, 8, 4; 80-87
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Pulley System with Three Degrees of Freedom
    Autorzy:
    Kocárník, P
    Jirku, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/971103.pdf
    Data publikacji:
    2008
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    mechanical system
    pulley system
    simulation
    Matlab
    Opis:
    This paper discusses the dynamic system solution with three degree of freedom consist a weightless cable thrown over two fixed side pulleys and the third, free pulley moving along the rope. The cable is stretched with weights attached to its ends and the weight of the free pulley causes the cable dip. Passive resistance on the pulleys stops them from moving. The mathematical description uses a system of differential equations combined with complex kinematic relationships and a description of the passive resistances. The set of equations is converted to a format suitable for numerical solution and a simulation model is created in the Matlab -Simulink program. The results are presented in the form of various relations of kinematic and dynamic system variables.
    Źródło:
    Journal of Machine Engineering; 2008, 8, 1; 114-122
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic systems with a finite degrees of freedom number
    Autorzy:
    Ładziński, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/229726.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    analytical dynamics
    electromechanical systems
    circuit theory
    Opis:
    Taking as a starting point the law of conservation of the total energy of the system, and introducing two basic state functions - the Lagrangian and the Rayleigh function, the general form of the equation of motion for any dynamic system with a finite number of degrees of freedom is derived. The theory is illustrated by considering the rotating - type electromechanical energy converter with six degrees of freedom being the model of all essentially important types of DC and AC machines, including rotating power amplifiers, induction - and synchronous type motors - all of them discussed from both, the steady-state and the transient point of view. In the next part of the paper there is described a simple electric circuit with its model characterized by the holonomic constraints of the velocity-type. Finally, there is presented the kinematics and dynamics of the interesting mechanical system - the gyroscope placed on the rotating Earth.
    Źródło:
    Archives of Control Sciences; 2014, 24, 2; 207-234
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectral analysis of parametric two degrees- of-freedom system
    Autorzy:
    Krzyżkowski, J.
    Pyryev, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/115639.pdf
    Data publikacji:
    2015
    Wydawca:
    Fundacja na Rzecz Młodych Naukowców
    Tematy:
    parametric vibrations
    Hill equation
    TDOF system
    spectral analysis
    drgania parametryczne
    równanie Hilla
    system TDOF
    analiza widmowa
    Opis:
    In this paper model of a vibrating system of two rotating, stressed to each other and periodically losing contact cylinders is presented. The model is described by two-degrees-of-freedom Hill's differential equations system, which was numerically solved. Spectra of the vibrations were analyzed in here.
    Źródło:
    Challenges of Modern Technology; 2015, 6, 4; 9-13
    2082-2863
    2353-4419
    Pojawia się w:
    Challenges of Modern Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stabilization mechanism for helicopter pad with four degrees of freedom
    Autorzy:
    Brewczyński, D.
    Tora, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/242515.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    mechanical engineering
    maritime engineering
    kinematic analysis
    mechanism design
    safety
    Opis:
    Helipad located on ships greatly increases their ability to perform tactical and logistical abilities. They allow performing reconnaissance from the air, transportation of cargos and people to and from the ship. Landing on a moving ship particularly small size during bad weather is not a safe manoeuvre. Article provides an overview of existing solutions that improve safety during the landing manoeuvre of the helicopter to the ship and describes an innovative mechanism with can stabilize helicopter pad in four degrees of freedom. This solution is characterized in that the landing plate is movable and actuated simultaneously by two support plates and two levers. Plates and levers are driven by separate linear motors that move along the guides connected to the base. The main feature of the mechanism is that when the base is not stable, it can reduce the linear movement of the landing platform in the vertical and transverse direction and angular displacement around an axis perpendicular and parallel to the axis of the ship. A preferred feature of the mechanism is that in folded position it occupies relatively little space. In addition, advantageous attribute of the mechanism is its large working area, enabling the reduction of high amplitude vibration. The article contains a calculation of the kinematics for the proposed structure of the mechanism. It also includes speed drives waveforms, which are the result of simulations for the input parameters of the ship movement.
    Źródło:
    Journal of KONES; 2015, 22, 3; 7-12
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Inverse kinematics model for a 18 degrees of freedom robot
    Autorzy:
    Ortega-Palacios, Miguel Angel
    Palomino-Merino, Amparo Dora
    Reyes-Cortes, Fernando
    Powiązania:
    https://bibliotekanauki.pl/articles/27314227.pdf
    Data publikacji:
    2023
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    bioloid premium robot
    forward kinematics
    inverse kinematic
    kinematic chain
    Opis:
    The study of humanoid robots is still a challenge for the scientific community, although there are several related works in this area, several limitations have been found in the literature that drive the need to develop an inverse kinematic modeling of biped robots. This paper presents a research proposal for the Bioloid Premium robot. The objective is to propose a complete solution to the inverse kinematics model for a 18 DOF (Degrees Of Freedom) biped robot. This model will serve as a starting point to obtain the dynamic model of the robot in a subsequent work. The proposed methodology can be extended to other biped robots.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2023, 17, 1; 21--29
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Autonomy and Control. Dynamics of Degrees of Freedom in Living Systems
    Autorzy:
    Negru, Teodor
    Powiązania:
    https://bibliotekanauki.pl/articles/966756.pdf
    Data publikacji:
    2016-12-01
    Wydawca:
    Uniwersytet Warszawski. Wydział Filozofii
    Opis:
    According to the organizational view, the autonomy of a living system should be approached from the perspective of processes that contribute to generating and constantly maintaining the internal organization of the living system, as well as to preserving the structural relation between the organism and its environment. However, a living system is both a biological organism and a certain type of complex system. Starting from this perspective, I will define the autonomy of a living system as the totality of the states it can access as response to the challenges of the environment, meaning the totality of the system’s degrees of freedom. However, understanding the autonomy of a living system also depends on the account of the controlling mechanisms, which contribute to generating and managing its degrees of freedom. In the case of basic living organisms, one can talk of an adaptive control involving the regulation of the internal processes in order to create a coherent pattern of action that would adjust the internal and external behavior of the organism to the environmental conditions. Regulation of the internal processes and the exchange of matter and energy with the environment determine the emergence of an incipient form of self, which is a consequence of existing correlations among the basic adaptive functions of any biological system. The nervous system provides the organism with an advanced form of control, which implies a flexible and multidimensional state space, whose level of complexity is higher than the one configured by the metabolic reactions. In this case, a sensorimotor self emerges, which is the result of integration of the body and environment into a systemic whole. Moreover, in advanced organisms, such as humans, a new metacognitive level emerges, i.e. consciousness. Consciousness not only enhances the state space of an organism but also creates complex patterns of behavior with new and unpredictable trajectories, which entails multiple and complex degrees of freedom. Consciousness is at the origin of the emergence of a conscious self, which is capable of conscious selection of the constraints that would modulate its behavioral patterns.
    Źródło:
    Filozofia Nauki; 2016, 24, 4; 5-25
    1230-6894
    2657-5868
    Pojawia się w:
    Filozofia Nauki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic model of a crankshaft assembly with two degrees of freedom
    Autorzy:
    Chmielewski, A.
    Bogucki, Ł.
    Gumiński, R.
    Mączak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/244367.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    distributed generation
    dynamic model
    crankshaft assembly
    Opis:
    Nowadays, growing attention is directed towards energy efficiency and issues related to respecting energy. An extremely vital role at improving energy efficiency plays the cogeneration technologies. In the 2012/27/UE Directive [1], the gas turbines [2] in combination with heat recovery, combustion engines [3, 4], steam engines [4], fuel cells [5-7], microturbines [8], Rankine organic cycle [9, 10], Stirling engines [11-15], and others, were included among cogeneration technologies, in which electric energy is produced from waste heat in the combined process. In this work, the distributed generation sources have also been addressed. From the perspective of the article herein, the sources equipped with the crankshaft assembly have been particularly emphasised. This mechanism converts chemical energy of, among others, fuel or working element into mechanical energy (the piston reciprocating motion is converted into rotary motion of a crankshaft). In this work, the physical model of the crankshaft assembly has been shown, with two degrees of freedom. On the basis of analysis of the physical model (with the static mass reduction), a single-piston simulation model has been developed of the crankshaft assembly, using the Matlab&Simulink software. On the basis of the analysis of the system, the motion equations have been derived, which served the purpose of building the simulation model. Because of the conducted simulations, the curves of displacement, velocity, and piston acceleration have been presented, and, respectively, the angular displacement, angular velocity, and angular acceleration of the crankshaft. The constructed model should be seen as a part of a multi-piston working mechanism in a, for example, Stirling engine.
    Źródło:
    Journal of KONES; 2015, 22, 3; 275-282
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Water entry of a wedge into waves in three degrees of freedom
    Autorzy:
    Sun, Shi Yan
    Chen, Hai Long
    Xu, Gang
    Powiązania:
    https://bibliotekanauki.pl/articles/259045.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    water entry
    nonlinear waves
    three degrees of freedom
    boundary element method
    auxiliary function method
    Opis:
    The hydrodynamic problem of a two-dimensional wedge entering into a nonlinear wave in three degrees of freedom is investigated based on the incompressible velocity potential theory. The problem is solved through the boundary element method in the time domain. To avoid numerical difficulties due to an extremely small contact area at the initial stage, a stretched coordinate system is used based on the ratio of the Cartesian system in the physical space to the distance travelled by the wedge in the vertical direction. The mutual dependence of body motion and wave loading is decoupled by using the auxiliary function method. Detailed results about body accelerations, velocities and displacements at different Froude numbers or different waves are provided, and the mutual effect between body motion and wave loading is analysed in depth.
    Źródło:
    Polish Maritime Research; 2019, 1; 117-124
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of anthropomorphic dual arm robot with distinct degrees of freedom for coordinated operations
    Autorzy:
    Abhaykrishna, K. M.
    Parayil, Nidhi Homey
    Reghunandan, Ibin Menon
    Sudheerx, Sudheer A. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/385000.pdf
    Data publikacji:
    2019
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    dual arm robot
    anthropomorphic ratio
    distinct degrees of freedom
    coordination
    object detection
    Opis:
    Development of assistive robots for helping the disabled is a field of research that has gathered attention recently. According to surveys, about one billion people in the world population have some kind of disability. Dual arm robots are a suitable solution for helping people with mobility impairments. The current development in the field of dual-arm robots is focused mainly in the industrial field to carry out cyclic tasks. This includes activities such as pick and place, assembling parts and doing other industrial operations. Unlike human arms, these dual arm robots lack versatility in doing a wide variety of tasks with adequate coordination between the arms. Due to these constraints, industrial dual arm robots cannot be directly implemented for assisting the disabled. This paper focuses on designing a compact dual arm robot which closely mimics human arms to do coordinated tasks with lesser Degrees of Freedom (DoF). Therefore, the developed robot extends its capabilities from industrial applications to daily life activities. Closed loop control is used in actuating the proposed 9 DoF dual arm robot with distinct DoF. Target position is acquired using image processing. Hand to hand coordination in various operations such as pick and place, transferring objects, serving food, etc. has successfully experimented.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2019, 13, 4; 52-64
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quantum Control of Motional States of Neutral Atoms: Exploiting the External Degrees of Freedom
    Autorzy:
    Bigelow, N. P.
    Chałupczak, W.
    Ejnisman, R.
    Pu, H.
    Rudy, P.
    Shaffer, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968501.pdf
    Data publikacji:
    1998-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.75.Fi
    32.80.Pj
    42.50.Dv
    Opis:
    As research in quantum optics has advanced, so too has our ability to precisely tailor the quantum state of a system. Indeed, techniques for quantum state preparation have become sufficiently advanced that an entire subfield has appeared which has been given the name "quantum control". Parallel to these advances have been other striking developments in quantum optics, in particular, laser cooling and trapping of neutral atoms. In this paper we describe some of the recent advancements in laser cooling, particularly in our laboratories, and point out that laser cooling and trapping is also realizing an important form of quantum control. In laser cooling, instead of exercising control over the internal quantum state of an atom or molecule or a laser field, we are instead controlling a complementary set of degrees of freedom: those of the external coordinates of the atom.
    Źródło:
    Acta Physica Polonica A; 1998, 93, 1; 11-29
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Robust flat filtering control of a two degrees of freedom helicopter subject to tail rotor disturbances
    Autorzy:
    Sánchez-Meza, Victor-Gabriel
    Lozano-Hernández, Yair
    Gutiérrez-Frías, Octavio
    Lozada-Castillo, Norma
    Luviano-Juárez, Alberto
    Powiązania:
    https://bibliotekanauki.pl/articles/24200696.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    flat filtering control
    generalized proportional integral control
    nonlinear system
    tail rotor disturbance
    two degrees of freedom helicopter
    sterowanie całkujące
    układ nieliniowy
    zakłócenia wirnika
    Opis:
    This article deals with modelling and a flatness-based robust trajectory tracking scheme for a two degrees of freedom helicopter, which is subject to four types of tail rotor disturbances to validate the control scheme robustness. A mathematical model of the system, its differential flatness and a differential parametrization are obtained. The flat filtering control is designed for the system control with a partially known model, assuming the non-modelled dynamics and the external disturbances (specially the tail rotor ones) to be rejected by means of an extended state model (ultra-local model). Numerical and experimental assessments are carried out on a characterized prototype whose yaw angle (ψ), given by the z axis, is in free form, while the pitch angle (θ), which results from rotation about the y axis, is mechanically restricted. The proposed controller performance is tested through a set of experiments in trajectory tracking tasks with different disturbances in the tail rotor, showing robust behaviour for the different disturbances. Besides, a comparison study against a widely used controller of LQR type is carried out, in which the proposed controller achieves better results, as illustrated by a performance index.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2023, 33, 4; 521--535
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The control system for a manipulator with two degrees of freedom for water hydrostatic transmission drive
    Autorzy:
    Kucybała, P.
    Sobczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/248151.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    fluid power control system
    hydrostatic transmission system
    water hydraulics
    Opis:
    The article presents concepts of control of the manipulator with two degrees of freedom, which uses a water hydraulic power unit to drive the actuators. The proposed control system is based on the use of electromagnetically controlled “rosettes valve” and proportional flow control valve. The control system is implemented using a computer equipped with a module for the real-time operating system (XPC Target) working in connection with the environment Matlab/Simulink. Controlled variable of the drive system is the displacement of the individual hydraulic cylinder and after determining manipulator kinematics, any point of the object in operating space. The positioning error of individual manipulator elements will be determined during the test in terms of different control algorithms, using the PID controller and PWM signal. In addition, it analyses the impact of changes in the velocity of the piston rod for the boom mechanism and the arm mechanism. An important aspect of the presented hydrostatic drive system is the use of water as a medium that physical and chemical properties are different from commonly used hydraulic oil, and which is friendly to the environment and meet the high cleanliness requirements for the fluid used to transfer the hydrostatic energy. Therefore, the control system requires a different approach, tied with synchronous control valves ON/OFF and proportional control flow regulators to achieve high accuracy.
    Źródło:
    Journal of KONES; 2015, 22, 3; 125-132
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Steady state vibration of the periodically forced and damped pure nonlinear two-degrees-of-freedom oscillator
    Autorzy:
    Cveticanin, Livija
    Zukovic, Miodrag
    Cveticanin, Dragan
    Powiązania:
    https://bibliotekanauki.pl/articles/280690.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    non-harmonic excitation
    force identification
    steady-state motion
    van der Pol oscillator
    Duffing oscillator
    Opis:
    In the paper, a pure nonlinear and damped two-mass oscillator excited with a periodical force is considered. The oscillator is modelled with a system of two coupled second order nonlinear and non-homogenous equations. Using the model, two problems are investigated: one, identification of the excitation force for the known vibrating response of the system, and the second, determination of vibrations of the system excited with the known periodical force. Using the steady-state motion of the nonlinear oscillator, a method for identification of the excitation force is developed. For the pure nonlinear oscillator, it is obtained that the forcing function has the form of the Ateb function. However, if the excitation force is known, the procedure for computing the steady-state vibration of the system is introduced. The solution corresponds to steady-state vibrations of the free oscillator, but the amplitude and phase are assumed to be time variable. The averaged solutions are obtained for the pure nonlinear oscillator with an additional linear elastic force and for the van der Pol oscillator. Analytically obtained solutions are compared with numerical ones. They are in good agreement.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2019, 57, 2; 445-460
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Decision of the direct position problem of the joint relative manipulation mechanism with five degrees of freedom
    Autorzy:
    Pashchenko, V. N.
    Meleshchenko, D. I.
    Rashoyan, G. V.
    Malyshev, D. I.
    Kuzmina, V. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/266251.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    kinematyka
    niezawodność maszyn
    manipulator równoległy
    kinematics
    machine reliability
    parallel manipulator
    Opis:
    One of the mechanisms of joint relative manipulation with five degrees of freedom is considered. An approach to solving the direct positional problem is described. A simplified 3D model was created to verify the correctness of the solution. The results of a comparison of calculated and experimental data are presented.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2018, 23, 4; 1025-1033
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new nondeterministic method for optimal selection of master degrees of freedom for dynamic condensation based on evolutionary optimization
    Autorzy:
    Mucha, Waldemar
    Powiązania:
    https://bibliotekanauki.pl/articles/1839637.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    dynamic condensation
    optimization
    evolutionary algorithm
    model order reduction
    Opis:
    The following paper presents a new method for choosing a set of master degrees of freedom for the process of dynamic condensation in order to reduce a finite element model. The general rule is that the more degrees of freedom are eliminated, the more accurate the reduced model is. However, eliminating different subsets (of equal sizes) of degrees of freedom may influence the accuracy differently. Therefore, choosing an optimal subset is crucial. The presented method is based on multicriterial evolutionary optimization which makes it the first nondeterministic approach based on computational optimization technique for this application.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2020, 58, 2; 445-458
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Techniki wykrywania uszkodzeń pamięci z wykorzystaniem stopni swobody testów krokowych
    Memory faults detection techniques with use of degrees of freedom in march tests
    Autorzy:
    Sokół, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/341181.pdf
    Data publikacji:
    2008
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    testowanie pamięci
    testy krokowe
    uszkodzenia PSF
    stopnie swobody
    memory testing
    march tests
    pattern sensitive faults (PSF)
    degrees of freedom
    Opis:
    Publikacja zawiera opis wybranych metod i technik wykrywania uszkodzeń pamięci z wykorzystaniem stopni swobody transparentnych testów krokowych. Główna uwaga została skupiona na uszkodzeniach uwarunkowanych zawartością typu Pattern Sensitive Faults (PSF) jako najtrudniejszych do wykrycia. Zaproponowane wykorzystanie stopni swobody testów krokowych przejawia się możliwością efektywnego przeprowadzenia transparentnego testowania i wykrywania uszkodzeń typu PSF przez proste testy krokowe i bazuje na możliwści wielokrotnego uruchomienia testu przy zmianach warunków początkowych (porządku adresowania) dla każdego uruchomienia. Wykorzystane i zaproponowane metody umożliwiają generowanie pełnych sekwencji adresowych oraz pozwalają na optymalny wybór adresów startowych przy wielokrotnym uruchomieniu testów krokowych. W pierwszej części pracy przedstawiona została problematyka testowania pamięci oraz stopnie swobody testów krokowych. Druga część pracy zawiera opis zaproponowanych rozwiązań wraz z wynikami wybranych eksperymentów.
    Publication shows the description of selected methods and techniques for memory faults detection with use of degrees of freedom inherent to transparent March tests. This paper deals with Pattern Sensitive Faults (PSF) as the most difficult to detect. Proposed techniques of use of degrees of freedom in March testing manifest itself in effective transparent memory testing and PSF faults detection with use of simple March tests, based on the possibility of multiple run of test with different initial conditions like address order for each run. Proposed methods allow us to choose in an optimal way starting addresses for multiple March tests run. In the first part of this publication, memory testing problems, testing principles and degrees of freedom were presented. Second part of this publication shows the description of proposed solutions with selected results.
    Źródło:
    Zeszyty Naukowe Politechniki Białostockiej. Informatyka; 2008, 3; 129-144
    1644-0331
    Pojawia się w:
    Zeszyty Naukowe Politechniki Białostockiej. Informatyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model trajektorii lotu pocisku wirującego o sześciu stopniach swobody zgodny ze Stanagiem 4355
    Equations of motion for six degrees of freedom trajectories of artillery projectiles consistent with Stanag 4355
    Autorzy:
    Baranowski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/211042.pdf
    Data publikacji:
    2008
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    balistyka zewnętrzna
    dynamika lotu
    równania ruchu
    exterior ballistics
    fight dynamics
    equations of motion
    Opis:
    W pracy przedstawiono sposób konstruowania modelu matematycznego dynamiki lotu pocisków stabilizowanych obrotowo, w którym pocisk traktowany jest jako osiowosymetryczna bryła sztywna o sześciu stopniach swobody. Zastosowano nazewnictwo i oznaczenia zgodne ze Stanagiem 4355 ed.4 [7]. Wektorowa postać równań ruchu pocisku jest zaktualizowaną wersją równań opublikowanych w pracy [3]. Skalarne równania zarówno ruchu postępowego, jak i obrotowego wyprowadzono w układzie związanym z Ziemią, wykorzystując zamiast kątów Eulera, cosinusy kierunkowe osi symetrii pocisku.
    In the paper, the equations of motion of a spin-stabilized, dynamically stable, conventional artillery projectile, possessing at least trigonal symmetry were introduced. The vector six degrees of freedom (6-DOF) differential equations of motion are an updated edition of those published at the BRL in report [1] and are consistent with Stanag 4355 [2]. This model is formulated to solve the projectile pitching and yawing motion in terms of direction cosines of the projectile's axis of symmetry, rather than the Euler-angle method.
    Źródło:
    Biuletyn Wojskowej Akademii Technicznej; 2008, 57, 3; 155-172
    1234-5865
    Pojawia się w:
    Biuletyn Wojskowej Akademii Technicznej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The use of synthesis methods in position optimisation and selection of tuned mass damper (TMD) parameters for systems with many degrees of freedom
    Autorzy:
    Dymarek, Andrzej
    Dzitowski, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1409049.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    structural control system
    vibration
    simple fractions
    synthesis
    rational functions
    dynamic characteristics
    Opis:
    The paper formulates and formalises a method for selecting parameters of the tuned mass damper (TMD) for primary systems with many degrees of freedom. The method presented uses the properties of positive rational functions, in particular their decomposition, into simple fractions and continued fractions, which is used in the mixed method of synthesis of vibrating mechanical systems. In order to formulate a method of tuning a TMD, the paper discusses the basic properties of positive rational functions. The main assumptions of the mixed synthesis method is presented, based on which the general method of determining TMD parameters in the case of systems with many degrees of freedom was formulated. It has been shown that a tuned mass damper suppresses the desired resonance zone regardless of where the excitation force is applied. The advantages of the formulated method include the fact of reducing several forms of the object’s free vibration by attaching an additional system with the number of degrees of freedom corresponding to the number of resonant frequencies reduced. In addition, the tuned mass damper determined in the case of excitation force applied at a single point can be attached to any element of the inertial primary system without affecting the reduction conditions in this way. It results directly from the methodology formalised in the paper. As part of the paper, numerical calculations were performed regarding the tuning of the TMD to the first form of free vibration of a system with 3 degrees of freedom. The parameters determined were subjected to analysis and verification of the correctness of the calculations carried out. For the considered case of a system with 3 degrees of freedom together with a TMD, time responses of displacement, from each floor, were generated to excitation induced by a harmonic force equal to the first form of vibration of the basic system. In addition, in the case of the parameters obtained, the response of the inertial element system to which the TMD was attached to random white noise excitation was determined.
    Źródło:
    Archives of Control Sciences; 2021, 31, 1; 185-211
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    WIELOWYMIAROWOŚĆ KREATYWNOŚCI W EDUKACJI
    MULTIDIMENSIONALITY OF CREATIVITY IN EDUCATION
    Autorzy:
    Ronginska, Tatiana
    Powiązania:
    https://bibliotekanauki.pl/articles/424192.pdf
    Data publikacji:
    2019
    Wydawca:
    Lubuskie Towarzystwo Naukowe
    Tematy:
    adaptation
    education
    creativity
    degrees of freedom
    mental health
    adaptacja
    edukacja
    kreatywność
    stopnie swobody
    zdrowie psychiczne
    Opis:
    The paper attempts to analyze the categories of creativity in relation to the tasks of modern education. Creativity is presented in the aspects of adaptation, mental health, intellect and cognitive structure development. Based on the presented content of the components of creativity, the author proposed her own definition of the concept, focusing on its major dimensions, and demonstrated the possibilities to enhance the individual’s creativity in the process of education.
    W artykule przestawiono próbę analizy kategorii kreatywności w odniesieniu do zadań współczesnej edukacji. Kreatywność przedstawiono w aspektach adaptacji, zdrowia psychicznego, inteligencji i rozwoju struktur poznawczych. Na podstawie zaprezentowanych treści kategorii kreatywności zaproponowano autorską definicję pojęcia ze wskazaniem na jej główne wymiary oraz pokazano możliwości wzmocnienia kreatywnego potencjału jednostki w procesie edukacji.
    Źródło:
    Rocznik Lubuski; 2019, 45, 1; 15-27
    0485-3083
    Pojawia się w:
    Rocznik Lubuski
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Peg-on-hole: fundamental principles of motion of a peg leaning on a horizontal hole edge
    Autorzy:
    Chernyakhovskaya, L. B.
    Simakov, D. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/102122.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    cylindrical parts
    three contact points
    complex motion
    two degrees of freedom
    dynamic reactions
    differential equations
    Opis:
    This paper presents a solution to the problem of a peg leaning on the edge of a horizontal hole at three points. The object of the interest is the motion in the course of automated peg-in-hole assembly. The complex motion of a peg is described in two degrees of freedom. These degrees of freedom are planar motion and rotational motion. Planar motion provides parts alignment via a change of nutation angle. Rotational motion occurs around a hole axis. It is described by a precession angle. The kinematic analysis of these was performed. Based on this analysis the directions of the peg velocities at the contact points were established. The directions of forces acting on the peg at these points were also determined. The system of Dynamic Differential Equations of the generalized coordinates was derived. This system determines the equations of the peg motion and dynamic reactions. During rotational motion, the forces acting on the peg at contact points are shown to be significantly reduced. This reduction improves the conditions of parts alignment and increases the assembly quality.
    Źródło:
    Advances in Science and Technology. Research Journal; 2017, 11, 4; 49-59
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metoda Monte Carlo w zagadnieniach o dużej liczbie stopni swobody
    Monte Carlo method in matters with a large number of degrees of freedom
    Autorzy:
    Białas, Teresa
    Jasiński, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/14150186.pdf
    Data publikacji:
    2022-06-30
    Wydawca:
    Akademia Nauk Stosowanych w Nowym Sączu
    Tematy:
    metoda Monte Carlo
    metoda quasi-Monte Carlo
    ciąg Haltona
    szyfrowany ciąg Haltona
    dyskrepancja
    ciąg van der Corputa
    Monte Carlo method
    quasi-Monte Carlo method
    Halton sequence
    scrambled Halton sequence
    discrepancy
    van der Corput sequence
    Opis:
    Wraz ze wzrostem możliwości obliczeniowych komputerów i upowszechnieniu technologii obliczeń chmurowych rośnie znaczenie metod symulacyjnych, w szczególności metody Monte Carlo. Jakość uzyskanych wyników w dużej mierze zależy od zastosowanych w tej metodzie ciągów liczbowych. W artykule przybliżono zagadnienie tworzenia oraz zastosowania ciągów pseudolosowych i quasilosowych. Celem niniejszej publikacji było eksperymentalne zbadanie różnic w uzyskanych wynikach przy zastosowaniu różnych ciągów liczbowych dla zagadnień o dużej liczbie stopni swobody.
    Along with the increase in computing capabilities of computers and the spread of cloud computing technologies, the importance of simulation methods, in particular the Monte Carlo method, grows. The quality of the obtained results largely depends on the number sequences used in this method. The article presents the issue of creating and applying pseudorandom and quasi-random sequences. The aim of this publication was to experimentally investigate the differences in the obtained results using different number sequences for problems with a large number of degrees of freedom.
    Źródło:
    Studia Ekonomiczne. Gospodarka, Społeczeństwo, Środowisko; 2022, 1/2022 (9); 102-110
    2544-6916
    2544-7858
    Pojawia się w:
    Studia Ekonomiczne. Gospodarka, Społeczeństwo, Środowisko
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kształtowanie własności dynamicznych płaskiego równoległoboku przegubowego o dwóch stopniach swobody poprzez zmianę parametrów inercyjnych jego ogniw
    Articulated flat parallelogram with two degrees of freedom by changing the inertia parameters for its bars
    Autorzy:
    Gruszka, P.
    Maciąg, P.
    Markiewicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/250001.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Naukowo-Wydawniczy TTS
    Tematy:
    równoległobok przegubowy
    ruch płaski mechanizmu przegubowego
    articulated parallelogram
    plane motion
    Opis:
    W artykule przedstawiono analizę własności dynamicznych płaskiego równoległoboku przegubowego o dwóch stopniach swobody. Poprzez zmianę parametrów inercyjnych każdego z ogniw ruchomych mechanizmu uzyskano efekt linearyzacji i odsprzężenia dynamicznego równania ruchu polegający na wyeliminowaniu składników zawierających iloczyny współrzędnych niezależnych i ich pochodnych. Za pomocą symulacji numerycznych przedstawiono wpływ tych działań na przebiegi czasowe momentów napędowych i reakcji w przegubach mechanizmu.
    This paper presents the analysis of the dynamic properties of flat parallelogram with two degrees of freedom. Changing the inertia parameters for each bar of the mechanism resulted in linearization and dynamic decoupling of the motion equation in which the terms including the products of the independent coordinates and their derivatives were eliminated. This affects the timing of input torques and performance of the joints which was shown by means of numerical simulations.
    Źródło:
    TTS Technika Transportu Szynowego; 2013, 10; 793-801, CD
    1232-3829
    2543-5728
    Pojawia się w:
    TTS Technika Transportu Szynowego
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Projekt i implementacja laboratoryjnego modułowego manipulatora o pięciu stopniach swobody (5R) z wbudowanym systemem sterowania
    Design and implementation of a laboratory modular manipulator with five degrees of freedom with embedded control system
    Autorzy:
    Augustyn, J.
    Cichocki, Ł.
    Duda, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/275809.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    manipulator
    system mechatroniczny
    system wbudowany
    system sterowania
    system czasu rzeczywistego
    mechatronic system
    embedded system
    real-time system
    Opis:
    W artykule przedstawiono projekt oraz praktyczną realizację modułowego manipulatora o pięciu stopniach swobody. Omówiono założenia projektowe dotyczące części mechanicznej. Zaprezentowano strukturę wieloprocesorowego, hybrydowego systemu sterowania. Manipulator przeznaczony jest do zastosowań laboratoryjno-dydaktycznych.
    This paper presents the design and practical implementation of the modular manipulator with five degrees of freedom. The conceptual design of mechanical parts is depicted. Manipulator platform uses multiprocessor, hybrid control system. This system was designed and developed. The manipulator can be used for laboratory and educational applications.
    Źródło:
    Pomiary Automatyka Robotyka; 2012, 16, 11; 54-58
    1427-9126
    Pojawia się w:
    Pomiary Automatyka Robotyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dokładność oceny współczynnika rozszerzenia metodą efektywnej liczby stopni swobody w oparciu o znajomość splotu trzech rozkładów prawdopodobieństwa
    Accuracy of coverage factor evaluation with the method of effective number degrees of freedom on this basis of fnowledge of the convolution on three probability distributions
    Autorzy:
    Turzeniecka, D.
    Otomański, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/151874.pdf
    Data publikacji:
    2002
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    ocena współczynnika rozszerzania
    metoda efektywnej liczby stopni swobody
    splot trzech rozkładów prawdopodobieństwa
    coverage factor evaluation
    method of effective number degrees of freedom
    fnowledge of the convolution
    three probability distributions
    Opis:
    Przedstawiono wyniki badań błędu oceny współczynnika rozszerzenia przybliżoną metodą efektywnej liczby stopni swobody przy pomiarach posrednich. Porównanie otrzymanych wyników ze znaną oceną tych błędów przy pomiarach bezpośrednich pozwoliło na okreslenie tendencji zmian błędów oceny współczynnika rozszerzenia, kiedy rośnie liczba składowych niepewności standardowych. Wykorzystano do badań znajomość charakterystyk współczynnika rozszerzenia dla splotu trzech wybranych rozkładów prawdopodobieństwa.
    The results of examining error evaluation of the coverage factor with approximate method of effective degrees in indirect measurements have been presented in the paper. comparison of the results obtained with the known evaluation of these errors in direct measurements enabled to determine the change tendency of the error of covertage factor evaluation, when the number of components of standard uncertainties grows. The knowledge of coverage factor characteristics for the convolution of three selected probability distributions was used for the examination.
    Źródło:
    Pomiary Automatyka Kontrola; 2002, R. 48, nr 9, 9; 21-24
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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