Autor: Van, T. T. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Analiza właściwości dynamicznych obserwatora Luenbergera dla układu napędowego z połączeniem sprężystym
Analyzis of the dynamic properties of the Luenberger observer for the drive system with elastic joint
Autorzy:: Tran Van, T.
Powiązania:: https://bibliotekanauki.pl/articles/1807992.pdf
Data publikacji:: 2011
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: układ dwumasowy
obserwator Luenbergera
tłumienie drgań
Opis:: In the paper issues related to design of the Luenberger observer for the drive system with elastic joint is presented. After short introduce into the topic the mathematical model of the drive is presented. Next the methodology of the design of the Luenberger observer is shown in detail. The classical as well as the alternative location (on the circle as well as on the line) of the system closed-loop poles are considered. The dynamical properties of the designed estimator are examined under simulation tests.
Źródło:: Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały; 2011, 65, 31; 366-377
1733-0718
Pojawia się w:: Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Locating critical circular and unconstrained failure surface in slope stability analysis with tailored genetic algorithm
Autorzy:: Pasik, T.
van der Meij, R.
Powiązania:: https://bibliotekanauki.pl/articles/178579.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: genetic algorithm
Spencers method
slope stability
critical failure surface
uplift phenomenon
Opis:: This article presents an efficient search method for representative circular and unconstrained slip surfaces with the use of the tailored genetic algorithm. Searches for unconstrained slip planes with rigid equilibrium methods are yet uncommon in engineering practice, and little publications regarding truly free slip planes exist. The proposed method presents an effective procedure being the result of the right combination of initial population type, selection, crossover and mutation method. The procedure needs little computational effort to find the optimum, unconstrained slip plane. The methodology described in this paper is implemented using Mathematica. The implementation, along with further explanations, is fully presented so the results can be reproduced. Sample slope stability calculations are performed for four cases, along with a detailed result interpretation. Two cases are compared with analyses described in earlier publications. The remaining two are practical cases of slope stability analyses of dikes in Netherlands. These four cases show the benefits of analyzing slope stability with a rigid equilibrium method combined with a genetic algorithm. The paper concludes by describing possibilities and limitations of using the genetic algorithm in the context of the slope stability problem.
Źródło:: Studia Geotechnica et Mechanica; 2017, 39, 4; 87-98
0137-6365
2083-831X
Pojawia się w:: Studia Geotechnica et Mechanica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Rozmyty obserwator Luenbergera dla układu napędowego z połączeniem sprężystym
Fuzzy Luenberger observer for the drive system with elastic joint
Autorzy:: Tran Van, T.
Kamiński, M.
Szabat, K.
Powiązania:: https://bibliotekanauki.pl/articles/1811981.pdf
Data publikacji:: 2012
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: obserwator Luenbergera
system rozmyty
układ dwumasowy
tłumienie drgań
Opis:: In the paper issues related to design of the fuzzy Luenberger observer for the drive system with elastic joint is presented. After short introduce the methodology of the design of the classical Luenberger observer is shown. Then the idea of the fuzzy selection of the Luenberger observer is introduced. The effectiveness of the proposed approach is shown in the simulation study.
Źródło:: Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały; 2012, 66, 32; 135-144
1733-0718
Pojawia się w:: Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Rozmyte estymatory mechanicznych zmiennych stanu układu napędowego z połączeniem sprężystym
Mechanical state variables fuzzy estimators for the two-mass system
Autorzy:: Kamiński, M.
Tran Van, T.
Szabat, K.
Powiązania:: https://bibliotekanauki.pl/articles/1807709.pdf
Data publikacji:: 2011
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: estymacja zmiennych stanu
systemy neuronowo-rozmyte
napęd dwumasowy
tłumienie drgań
Opis:: In the paper the issues related to the design of fuzzy estimators for the state variable estimation of the two-mass system are presented. In the introduction the estimation method are presented and their properties described. Next the two-mass system model and the considered control structure are presented. The design aspects of the fuzzy estimators are discussed. The theoretical consideration are confirmed by the simulation tests. In the study the samples obtained in the laboratory set-up are also used.
Źródło:: Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały; 2011, 65, 31; 211-221
1733-0718
Pojawia się w:: Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: The influence of a thoracolumbosacral orthosis on gait performance in healthy adults during walking
Autorzy:: Van Criekinge, T.
Truijen, S.
Hallemans, A.
Saeys, W.
Powiązania:: https://bibliotekanauki.pl/articles/306970.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: tułów
lokomocja
kinematyka
zjawisko biomechaniczne
torso
orthotic devices
locomotion
kinematics
biomechanical phenomenon
Opis:: Since the thorax and pelvis are primary determinants of normal and pathological walking, it is important to know how gait performance is influenced when the trunk is constraint. The objective of this study is to investigate the effect of a thoracolumbosacral orthosis (TLSO) on gait performance in healthy adults during overground walking. Methods: Fourteen healthy volunteers walked with and without TLSO. Outcome measures consisted of spatiotemporal parameters and clinically important joint angular time profiles of the lower limbs. Joint angular time profiles were assessed in the sagittal, frontal and transversal plane. A paired t-test was used for discrete parameters and spm1d for assessing the joint angular time profiles. Results: Walking with a constraint resulted in decreased stride time and step time, increased step width and cadence. In the sagittal plane, no significant differences were observed regarding joint kinematics in the hip, knee and ankle. In the frontal plane, decreased adduction during stance and abduction during swing was observed in the hip. In the transversal plane, increased external rotation of the hip and increased internal rotation of the ankle was seen when wearing a contstraint. Conclusions: Wearing a TLSO can already bring forth significant changes in gait performance, suggesting an important relationship between trunk movements and mobility.
Źródło:: Acta of Bioengineering and Biomechanics; 2018, 20, 4; 15-21
1509-409X
2450-6303
Pojawia się w:: Acta of Bioengineering and Biomechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Experience Report: Towards Extending an OSEK-Compliant RTOS with Mixed Criticality Support
Autorzy:: Gupta, T.
Luit, E. J.
van den Heuvel, M. M. H. P.
Bril, R. J.
Powiązania:: https://bibliotekanauki.pl/articles/384148.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: OSEK
RTOS
mixed criticality
real-time operating system
Opis:: Background: With an increase of the number of features in a vehicle, the computational requirements also increase, and vehicles may contain up to 100 Electronic Control Units (ECUs) to accommodate these requirements. For cost-effectiveness reasons, amongst others, it is considered desirable to limit the growth of, or preferably reduce, the number of ECUs. To that end, mixed criticality is a promising approach that received a lot of attention in the literature, primarily from a theoretical perspective. Aim: In this paper, we address mixed criticality from a practical perspective. Our prime goal is to extend an OSEK-compliant real-time operating system (RTOS) with mixed criticality support, enabling such support in the automotive domain. In addition, we aim at a system (i) supporting more than two criticality levels; (ii) with minimal overhead upon an increase of the so-called criticality level indicator of the system; (iii) requiring no changes to an underlying operating system; and (iv) featuring further extensions, such as hierarchical scheduling and multi-core. Method: We used the so-called adaptive mixed criticality (AMC) scheme as a starting point for mixed criticality. We extended that scheme from two to more than two criticality levels (satisfying (i)) and complemented it with specified behavior for criticality level changes. We baptized our extended scheme AMC*. Rather than selecting a specific OSEK-compliant RTOS, we selected ExSched, an operating system independent external CPU scheduler framework for real-time systems, which requires no modifications to the original operating system source code (satisfying (iii)) and features further extensions (satisfying (iv))). Results: Although we managed to build a functional prototype of our system, our experience with ExSched made us decide to rebuild the system with a specific OSEK-compliant RTOS, being µC/OS-II. We also briefly report upon our experience with AMC* and suggest directions for improvements. Conclusions: Compared to extending ExSched with AMC*, extending µC/OS-II turned out to be straightforward. Although we now have a basic system operational and available for experimentation, enhancements of the AMC*-scheme are considered desirable before exploitation in a vehicle. Background: With an increase of the number of features in a vehicle, the computational requirements also increase, and vehicles may contain up to 100 Electronic Control Units (ECUs) to accommodate these requirements. For cost-effectiveness reasons, amongst others, it is considered desirable to limit the growth of, or preferably reduce, the number of ECUs. To that end, mixed criticality is a promising approach that received a lot of attention in the literature, primarily from a theoretical perspective. Aim: In this paper, we address mixed criticality from a practical perspective. Our prime goal is to extend an OSEK-compliant real-time operating system (RTOS) with mixed criticality support, enabling such support in the automotive domain. In addition, we aim at a system (i) supporting more than two criticality levels; (ii) with minimal overhead upon an increase of the so-called criticality level indicator of the system; (iii) requiring no changes to an underlying operating system; and (iv) featuring further extensions, such as hierarchical scheduling and multi-core. Method: We used the so-called adaptive mixed criticality (AMC) scheme as a starting point for mixed criticality. We extended that scheme from two to more than two criticality levels (satisfying (i)) and complemented it with specified behavior for criticality level changes. We baptized our extended scheme AMC*. Rather than selecting a specific OSEK-compliant RTOS, we selected ExSched, an operating system independent external CPU scheduler framework for real-time systems, which requires no modifications to the original operating system source code (satisfying (iii)) and features further extensions (satisfying (iv))). Results: Although we managed to build a functional prototype of our system, our experience with ExSched made us decide to rebuild the system with a specific OSEK-compliant RTOS, being µC/OS-II. We also briefly report upon our experience with AMC* and suggest directions for improvements. Conclusions: Compared to extending ExSched with AMC*, extending µC/OS-II turned out to be straightforward. Although we now have a basic system operational and available for experimentation, enhancements of the AMC*-scheme are considered desirable before exploitation in a vehicle.
Źródło:: e-Informatica Software Engineering Journal; 2018, 12, 1; 305-320
1897-7979
Pojawia się w:: e-Informatica Software Engineering Journal
Dostawca treści:: Biblioteka Nauki

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