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Wyświetlanie 1-15 z 171
Tytuł:
Adjustment and implementation of CAD/CAM systems being used in polish aviation industry
Autorzy:
Adamski, W.
Powiązania:
https://bibliotekanauki.pl/articles/99527.pdf
Data publikacji:
2010
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
model based definition
design
methods
Opis:
This paper describes the detailed methods and process of creating MBD model (Model Based Definition) - presently used in aviation and automotive industry. Existing formats of the Authority dataset have been presented. Using CAD/CAM systems requires introduction of full control of all software used during entire manufacturing process. To maintain DPD (Digital Product Definition) data configuration, controlling production hardware and tools, all media created on the DPD data need to include dataset clear name, revisions level and any other additional unique client identification. There are two methods of reliable verification of data translation or transmission among reality by the use of computer hardware and software. The purpose of this paper is to present new rules of working with CAD/CAM systems in modern enterprises using manufacturing technologies of XXI'st century.
Źródło:
Journal of Machine Engineering; 2010, 10, 3; 37-47
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-agent system inspired distributed control of a serial-link robot
Autorzy:
Soumya, S.
Guruprasad, K. R.
Powiązania:
https://bibliotekanauki.pl/articles/384673.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
model-based control
distributed control
manipulator control
Opis:
Inspired by the multi-agent systems, we propose a model-based distributed control architecture for robotic manipulators. Here, each of the joints of the manipulator is controlled using a joint level controller and these controllers account for the dynamic coupling between the links by interacting among themselves. Apart from the reduced computational time due to distributed computation of the control law at the joint levels, the knowledge of dynamics is fully utilized in the proposed control scheme, unlike the decentralized control schemes proposed in the literature. While the proposed distributed control architecture is useful for a general serial-link manipulator, in this paper, we focus on planar manipulators with revolute joints. We provide a simple model-based distributed control scheme as an illustration of the proposed distributed model-based control architecture. Based on this scheme, distributed model-based controller has been designed for a planar 3R manipulator and simulations results are presented to demonstrate that the manipulator successfully tracks the desired trajectory.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2020, 14, 1; 29-38
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of an innovative approach for complex, causally determined failure chains
Autorzy:
Bielefeld, O.
Dransfeld, H.
Schlüter, N.
Winzer, P.
Powiązania:
https://bibliotekanauki.pl/articles/407289.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
model-based failure analysis
reliability
quality
safety
Opis:
A high number of examples in today’s global industry prove that it is difficult to ensure a certain level of quality. One possible reason is the increasing complexity of modern mechatronic product systems. Interface problems due to several involved science disciplines and the lack of understanding subsystems, which are delivered by different suppliers, make it difficult to identify critical components and specifications of elements. Furthermore, it is even harder to estimate the effects of elements because of their unknown dependencies and relations. Therefore it becomes more and more improbable to develop a safe, sustainable and high quality product right from the beginning. In order to understand failures in complex system structures today’s engineering industries need a generic approach that increases the understanding of systems, identifies critical components and considers the different levels of a system. It shall examine failures that cause system errors but also failures that limit system functions. Thus, it is necessary to model and simulate the causally failure chains and analyse over several system levels and elements with their dependencies. This leads to a better understanding of the whole picture of cause and effect. This research paper points out which requirements this new model-based approach has to fulfill and how it is possible to link quality and reliability methods to achieve an overall understanding and analysis of a complex system to assure high quality and sustainability.
Źródło:
Management and Production Engineering Review; 2017, 8, 3; 3-12
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and testing of power system protection functions using Simulink and EMTP
Autorzy:
Sawko, P.
Hill, K.
Evans, G.
Powiązania:
https://bibliotekanauki.pl/articles/410599.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
model based design
test automation
Simulink and EMTP
Opis:
This paper presents how simulation of power system behaviour under different disturbances can be used to test protection algorithms. A method for co-simulation using Electromagnetic Transient Program (EMTP) and Simulink is presented along with the procedure used for testing protection algorithms against different power system waveforms. The advantages of model based design are described showing how a realistic model of protection relay can be designed and how individual components are integrated.
Źródło:
Present Problems of Power System Control; 2013, 4; 51-65
2084-2201
Pojawia się w:
Present Problems of Power System Control
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some Applications of Panel Data Models in Small Area Estimation
Autorzy:
Nekrašaitė-Liegė, Vilma
Powiązania:
https://bibliotekanauki.pl/articles/465626.pdf
Data publikacji:
2011
Wydawca:
Główny Urząd Statystyczny
Tematy:
Small area estimation
panel-type data
model-based
model-assisted
Opis:
This study uses a real population from Statistics Lithuania to investigate the performance of different types of estimation strategies. The estimation strategy is a combination of sampling design and estimation design. The sampling designs include equal probability design (SRS) and unequal probability designs (stratified SRS and model-based sampling designs). Design-based direct Horvitz-Thompson, indirect model-assisted GREG estimator and indirect model-based estimator are used to estimate the totals in small area estimation. The underlying panel-type models (linear fixed-effects type or linear random-effects type) are examined in both stages of estimation strategies: sample design and construction of estimators.
Źródło:
Statistics in Transition new series; 2011, 12, 2; 265-280
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Model based compensation of geometrical deviations due to process forces
Autorzy:
Denkena, B.
Dahlmann, D.
Peters, R.
Witt, M.
Powiązania:
https://bibliotekanauki.pl/articles/99994.pdf
Data publikacji:
2017
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
model based compensation
reduction of geometrical errors
real-time model
Opis:
Machining accuracy can be considerably affected by deflections of machine tool components and the workpiece. This work presents a new approach for real-time deflection compensation, based on control integrated models. A real-time material removal rate (MRR) simulation determines the depth of cut which is used for process force calculation by Kienzle-Equations. Machine tool and workpiece deflections are then derived from a mechanical model using the calculated process forces. For this purpose, control based signals are used as model inputs. The total deviation is sent to the position controller as a setpoint offset. A dynamometer was applied to validate the simulated process forces. The presented approach was validated for cylindrical turning operations on chucked steel shafts. The experiments were carried out on a high-precision slant bed lathe. The results show, that geometrical errors could be reduced by more than 70% on average.
Źródło:
Journal of Machine Engineering; 2017, 17, 1; 5-16
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The comparison of model-based clustering with heuristic clustering methods
Autorzy:
Witek, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/657968.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
heurisic methods of clustering
probability models
model-based clustering
Opis:
Najczęściej w różnych analizach statystycznych wykorzystywane są klasyczne metody analizy skupień, opierające się na podejściu heurystycznym. W referacie zaprezentowane zostanie podejście modelowe w analizie skupień (model-based clustering), bazujące na modelach probabilistycznych. W części empirycznej referatu podejście to zostanie porównane z klasycznymi metodami taksonomicznymi (metodami hierarchicznymi oraz metodami iteracyjno- aglomeracyjnymi).
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2011, 255
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Teoria reakcji na pozycję w podejściu modelowym w takso- nomii
Item response theory in model-based clustering
Autorzy:
Genge, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/425062.pdf
Data publikacji:
2016
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
item response theory
latent class analysis
model-based clustering
Opis:
Item response theory is considered to be one of the two trends in methodological assessment of the reliability scale. In turn, latent class models can be viewed as a special case of model-based clustering, for heterogenous multivariate discrete data. We used the approach combining item response theory and latent class models to find groups of Polish households’ with similar saving ability levels. We analyzed data collected as part of the Polish Social Diagnosis using MultiLCIRT package of R.
Źródło:
Econometrics. Ekonometria. Advances in Applied Data Analytics; 2016, 1 (51); 9-19
1507-3866
Pojawia się w:
Econometrics. Ekonometria. Advances in Applied Data Analytics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigate the effectiveness of psychological treatment on the life quality and coping styles of Shishe abusers, based on the matrix model
Autorzy:
Dehkordi, Mahnaz Ali Akbari
Alipour, Ahmad
Saberi, Afshin
Powiązania:
https://bibliotekanauki.pl/articles/1191235.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Matrix model based psychological therapy
Life quality
Coping styles
Opis:
The current research was aimed to investigate the effectiveness of psychological treatment on the life quality and coping styles of Shishe abusers, based on the matrix model. The current study was semi-experimental. The statistical population of this research consisted of Shishe abusers in the city of Rasht. The research sample included 20 people who were selected through in access method and were randomly divided into two experimental and control groups. The World Health Organization's Life Quality Scale and Parker and Andler's Coping Styles Scale were administered to both groups in form of pretest and posttest. Findings: Findings revealed that participants' scores in therapeutic sessions were significantly higher compared to those in the control group in regard to subscales of problem oriented and emotion oriented coping styles. Also, in relation to life quality subscales, it was determined that experimental group scores in subscales of interpersonal relations, physical health and life requirements were significantly higher than those in the control group. It appears that a psychological therapy, based on a matrix model, cam cause to promote peoples' life quality level and thus offer more effective techniques for coping with negative stresses and emotions.
Źródło:
World Scientific News; 2016, 54; 98-109
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Poczucie śląskości wśród Ślązaków – analiza empiryczna z wykorzystaniem modeli klas ukrytych
A sense of being Silesian – an empirical analysis with the use of latent class models
Autorzy:
Genge, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/425295.pdf
Data publikacji:
2013
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
latent class analysis
mixture model
model-based clustering
categorical data
Opis:
The paper focuses on latent class models and their application for quantitative data. Latent class modeling is one of multivariate analysis techniques of the contingency table and can be viewed as a special case of model-based clustering, for multivariate discrete data. It is assumed that each observation comes from one of the numbers of subpopulations, with its own probability distribution. We used latent class analysis for grouping and detecting homogeneity of Silesian people using poLCA package of R. We analyzed data collected by the Department of Social Pedagogy, University of Silesia in Katowice.
Źródło:
Econometrics. Ekonometria. Advances in Applied Data Analytics; 2013, 4(42); 48-59
1507-3866
Pojawia się w:
Econometrics. Ekonometria. Advances in Applied Data Analytics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
SAE Teaching Using Simulations
Autorzy:
Burgard, Jan Pablo
Münnich, Ralf
Powiązania:
https://bibliotekanauki.pl/articles/465634.pdf
Data publikacji:
2015
Wydawca:
Główny Urząd Statystyczny
Tematy:
small area estimation
teaching
simulations
design-based simulations model-based simulations
Opis:
The increasing interest in applying small area estimation methods urges the needs for training in small area estimation. To better understand the behaviour of small area estimators in practice, simulations are a feasible way for evaluating and teaching properties of the estimators of interest. By designing such simulation studies, students gain a deeper understanding of small area estimation methods. Thus, we encourage to use appropriate simulations as an additional interactive tool in teaching small area estimation methods.
Źródło:
Statistics in Transition new series; 2015, 16, 4; 603-610
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Model-Based Design in algorithms’ prototyping for experimental acorn scarification rig
Zastosowanie metodyki projektowania opartej na modelu w prototypowaniu algorytmów dla badawczego stanowiska skaryfikacji żołędzi
Autorzy:
Przybyło, J.
Jabłoński, M.
Pociecha, D.
Tadeusiewicz, R.
Piłat, A.
Walczyk, J.
Kiełbasa, P.
Szczepaniak, J.
Adamczyk, F.
Powiązania:
https://bibliotekanauki.pl/articles/335729.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Maszyn Rolniczych
Tematy:
scarification
acorn
Model-Based Design
control
skaryfikacja
żołędzie
projektowanie
model MBD
sterowanie
Opis:
Assessment of viability of oak seeds is mainly performed by mechanical scarification followed by visual assessment by trained employees. This procedure is slow and prone to human errors, thus automation of this process is desirable. Shortening the design of complex automation systems requires the use of modern methods, allowing for modeling and simulation of systems containing elements of mechanical, electrical and digital components. The article presents selected aspects of the design of control algorithms for the acorn scarification prototype. A virtual prototyping and Model-Based Design (MBD) approach have been used.
Jedną ze stosowanych metod badania zmian mumifikacyjnych nasion jest skaryfikacja mechaniczna, połączona ze wzrokową oceną żywotności nasion przez człowieka. Ręcznie wykonywana procedura jest powolna i podatna na błędy, dlatego też automatyzacja tego procesu jest pożądana. Skrócenie czasu projektowania złożonych systemów automatyki wymaga stosowania nowoczesnych metod, pozwalających na modelowanie i symulację systemów zawierających elementy zarówno mechaniczne, elektryczne, jak i podzespoły cyfrowe. W artykule zaprezentowano wybrane aspekty projektowania algorytmów sterujących stanowiska badawczego do skaryfikacji żołędzi. Do rozwoju stanowiska badawczego wykorzystano wirtualne prototypowanie oraz metodykę projektowania opartą na modelu (MBD - ang. Model-Based Design).
Źródło:
Journal of Research and Applications in Agricultural Engineering; 2017, 62, 1; 166-170
1642-686X
2719-423X
Pojawia się w:
Journal of Research and Applications in Agricultural Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non‐linear model‐based predictive control for trajectory tracking and control effort minimization in a smartphone‐based quadrotor
Autorzy:
García, Luis
Rosero, Esteban
Powiązania:
https://bibliotekanauki.pl/articles/27314228.pdf
Data publikacji:
2022
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
quadrotor
model-based predictive control
smartphone
trajectory tracking
energy consumption
Opis:
In this paper, the design and implementation of a nonlinear model‐based predictive controller (NMPC) for predefined trajectory tracking and to minimize the control effort of a smartphone‐based quadrotor are developed. The optimal control actions are calculated in each iteration by means of an optimal control algorithm based on the non‐linear model of the quadrotor, considering some aerodynamic effects. Control algorithm implementation and simulation tests are executed on a smartphone using the CasADi framework. In addition, a technique for estimating the energy consumed based on control signals is presented. NMPC controller performance was compared with other works developed towards the con‐ trol of quadrotors, based on an H∞ controller and an LQI controller, and using three predefined trajectories, where the NMPC average tracking error was around 50% lower, and average estimated power and energy consumption slightly higher, with respect to the H∞ and LQI controllers.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2022, 16, 4; 13--18
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The method of developing the power supply system for electric rental go-kart
Autorzy:
Mateja, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2203617.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
go-kart
kart
electric vehicle
Model-Based Design
battery cell
Opis:
This article presents the results of work related to the power supply system for 10kW electric, rental go-kart. The research took into account a few types of battery cells. For the case study, the best option was chosen taking into account the restrictions included in the multicriteria analysis for further application. Chosen BLDC motor and battery type were tested on test stands and simulated in MATLAB/Simulink. Simulation model allowed to compare the characteristics from test stands and simulation and next tune the model. Minimum capacity of the batteries had to allow for at least 20 minutes of drive. Chosen elements: electric motor, motor controller, battery cells, BMS allowed to build the first prototype. Tests in real conditions showed the difference between simulation and research system. We could notice what to improve to tune the simulation model and the kart power supply system.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2023, 26(1); 45--56
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
State of the Art in Predictive Control of Wheeled Mobile Robots
Autorzy:
Harasim, P.
Trojnacki, M.
Powiązania:
https://bibliotekanauki.pl/articles/384731.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
wheeled mobile robot
motion control
predictive control
model-based control
optimization
Opis:
The paper is concerned with the problem of tracking control of wheeled mobile robots (WMRs) using predictive control systems. Various kinematic structures of WMRs important from the point of view of motion control are discussed. A hierarchical approach to the problem of motion control of this kind of robots is presented. The problems of trajectory tracking and path following control of WMRs are briefly discussed. The methods of predictive control of WMRs are described in detail and the following aspects relevant to predictive control are considered: kinematic structures of robots, slip of wheels and its compensation, assumed constraints, methods of optimization of the objective function, problems of model nonlinearity, linearization and discretization, stability of the control system and use of the state observers.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2016, 10, 1; 34-42
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 171

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