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Wyświetlanie 1-15 z 15
Tytuł:
Programowanie sanacji przestrzeni wiejskiej. Autorskie mechanizmy planistyczne na rzecz zrównoważonego kształtowania obszarów wiejskich
Programming of rural space sanation. Author planning mechanisms for sustainable shaping of rural areas
Autorzy:
Barełkowski, Robert
Wojtyra, Bartosz
Powiązania:
https://bibliotekanauki.pl/articles/650949.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
planowanie przestrzenne
obszary wiejskie
strategiczne rezerwy inwestycyjne
metoda FAST
spatial planning
rural areas
strategic investment resources
FAST method
Opis:
In the first part of the paper, the authors diagnose problems of spatial planning process in Poland being the result of the implementation of effective law. They identify how practice affected by this law generates land use conditions in the rural space. Common situation is that there is apparent lack of integration of planning and strategic documents affecting spatial policies within one territorial unit (commune) and their execution. This deficiency along with inefficient regulations are exploited and in conjunction with other phenomena like increased and uncontrolled development pressure (e.g. by property owners), particularization of prioritization in issuing administrative decisions related to land use, predatory economy of agricultural land, produce unsatisfactory qualities of the built environment. Also, social participation in spatial planning system is often limited and doesn’t meet specific objectives. In the second part, the authors use case studies in order to propose the method applied, as a part of research and related experiment, to the planning process. This study is immersed in particular, practical experience. The method encompasses: scenario-based approach (as part of the P.R.S. method), monitoring and evaluation of spatial policy in communes, introduction of multi-criteria analyses. These mechanisms allow for allowing to identify and understand the conditions and background of activities for spatial policy and aim to improve planning documents. In the summary, the authors construct a list of recommendations regarding programming of rural development planning. They emphasize the need for a stronger integration of spatial regulation on different levels of management of planning process. They postulate to amplify the integration of planning documents even if it means some degree of reorientation of initially stipulated hierarchy. One of key issues is the introduction of constant and continuous monitoring of spatial policy, preceding decision-making. The solution could be seen as a multi-criteria assessment of spatial conditions and directions, development studies should be based on. Public participation is depicted also as integrated and permeate community share in decision-making focused on clearly defined objectives, countering the conflicts arising from particularism of inhabitants. Authors attempt to define their interpretation of holistic approach to planning studies and documents using broad perspective, with recognition of necessity to acknowledge the uniqueness of every area or site, resulting in respecting different characteristics by relevant establishing of different planning objectives.
W pierwszej części artykułu autorzy diagnozują problemy procesu planowania przestrzennego w Polsce wynikające z obowiązującego systemu prawnego oraz identyfikują ich efekty w przestrzeni wiejskiej. W drugiej części skupiają się na prezentacji trzech wątków badawczych, stanowiących propozycję aplikacyjnych metod wdrażanych eksperymentalnie do procesu planistycznego, bazując na doświadczeniach praktycznych. W podsumowaniu konstruują listę rekomendacji dotyczących programowania sanacji zagospodarowania obszarów wiejskich.
Źródło:
Acta Universitatis Lodziensis. Folia Geographica Socio-Oeconomica; 2018, 32
1508-1117
2353-4826
Pojawia się w:
Acta Universitatis Lodziensis. Folia Geographica Socio-Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isogeometric Fast Multipole Boundary Element Method Based on Burton-Miller Formulation for 3D Acoustic Problems
Autorzy:
Chen, Leilei
Zhao, Wenchang
Liu, Cheng
Chen, Haibo
Marburg, Steffen
Powiązania:
https://bibliotekanauki.pl/articles/177486.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
isogeometric analysis
boundary element method
Burton-Miller method
acoustic scattering
fast multipole method
Opis:
An isogeometric boundary element method is applied to simulate wave scattering problems governed by the Helmholtz equation. The NURBS (non-uniform rational B-splines) widely used in the CAD (computer aided design) field is applied to represent the geometric model and approximate physical field variables. The Burton-Miller formulation is used to overcome the fictitious frequency problem when using a single Helmholtz boundary integral equation for exterior boundary-value problems. The singular integrals existing in Burton-Miller formulation are evaluated directly and accurately using Hadamard’s finite part integration. Fast multipole method is applied to accelerate the solution of the system of equations. It is demonstrated that the isogeometric boundary element method based on NURBS performs better than the conventional approach based on Lagrange basis functions in terms of accuracy, and the use of the fast multipole method both retains the accuracy for isogeometric boundary element method and reduces the computational cost.
Źródło:
Archives of Acoustics; 2019, 44, 3; 475-492
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On speeding up nano- and micromechanical calculations for irregular systems with long-range potentials
Autorzy:
Rybarska-Rusinek, L.
Rejwer, E.
Linkov, A.
Powiązania:
https://bibliotekanauki.pl/articles/201034.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nano- and micromechanics
long-range interaction
fast multipole method
cluster intensity
Opis:
Irregular systems with long-range interactions and multiple clusters are considered. The presence of clusters leads to excessive computational complexity of conventional fast multipole methods (FMM), used for modeling systems with large number of DOFs. To overcome the difficulty, a modification of the classical FMM is suggested. It tackles the very cause of the complication by accounting for higher intensity of fields, generated by clusters in upward and especially in downward translations. Numerical examples demonstrate that, in accordance with theoretical estimations, in typical cases the modified FMM significantly reduces the time expense without loss of the accuracy.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 2; 337-344
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Konstruowanie macierzy unitarnych dla kwantowego algorytmu decyzyjnego
Constructing unitary matrices for quantum decision algorithm
Autorzy:
Wiśniewska, J.
Powiązania:
https://bibliotekanauki.pl/articles/305969.pdf
Data publikacji:
2008
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
algorytm decyzyjny
kwantowa implementacja
metoda szybkiego wyznaczania macierzy unitarnych
decision algorithm
quantum implementation
fast method of calculating unitary matrix
Opis:
Praca zawiera opis algorytmu decyzyjnego oraz propozycję jego kwantowej implementacji. Algorytm składa się z czterech kroków - prowadzą one do wyznaczenia macierzowej postaci operatora kwantowego, który pozwala na rozwiązanie postawionego zadania decyzyjnego. Dla zadania decyzyjnego o n zmiennych należałoby rozwiązać układ 2 2n równań, aby wyznaczyć postać wspomnianego operatora. Dlatego też w pracy została opisana metoda szybkiego wyznaczania macierzowej postaci operatora unitarnego, która praktycznie eliminuje konieczność wykonywania jakichkolwiek obliczeń matematycznych.
Thesis includes description of decision algorithm and a proposal of its quantum implementation. The algorithm is based on four steps, which lead to construct matrix form of quantum operator solving given decision task. To calculate matrix form of mentioned operator, for decision problem with n variables, a system of 2 2n equations should be solved - that is why, in this thesis, also a fast method of constructing unitary matrix were presented.
Źródło:
Biuletyn Instytutu Systemów Informatycznych; 2008, 2; 59-65
1508-4183
Pojawia się w:
Biuletyn Instytutu Systemów Informatycznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
2D Structural Acoustic Analysis Using the FEM/FMBEM with Different Coupled Element Types
Autorzy:
Chen, L.
Zhao, W.
Liu, C.
Chen, H.
Powiązania:
https://bibliotekanauki.pl/articles/176330.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
boundary element method
finite element method
discontinuous boundary elements
acoustic fluid-structure interaction
fast multipole method
Opis:
A FEM-BEM coupling approach is used for acoustic fluid-structure interaction analysis. The FEM is used to model the structure and the BEM is used to model the exterior acoustic domain. The aim of this work is to improve the computational efficiency and accuracy of the conventional FEM-BEM coupling approach. The fast multipole method (FMM) is applied to accelerating the matrix-vector products in BEM. The Burton-Miller formulation is used to overcome the fictitious eigen-frequency problem when using a single Helmholtz boundary integral equation for exterior acoustic problems. The continuous higher order boundary elements and discontinuous higher order boundary elements for 2D problem are developed in this work to achieve higher accuracy in the coupling analysis. The performance for coupled element types is compared via a simple example with analytical solution, and the optimal element type is obtained. Numerical examples are presented to show the relative errors of different coupled element types.
Źródło:
Archives of Acoustics; 2017, 42, 1; 37-48
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Method of measurement and reduction of the electromagnetic disturbances inducted by switching surges in LV circuits
Metoda pomiaru i redukcji zaburzeń elektromagnetycznych indukowanych przez przepięcia łączeniowe w obwodach nN
Autorzy:
Wąsik, Patryk D.
Powiązania:
https://bibliotekanauki.pl/articles/2070265.pdf
Data publikacji:
2021
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
EMI
circuit breaker
fast measurement method
LV circuits
wyłącznik nadprądowy
szybka metoda pomiarowa
obwody nN
Opis:
This paper presents a fast, reliable and portable method for measuring electromagnetic disturbances in LV circuits (overcurrent circuit breakers). The experiment was carried out under conditions reflecting the real measurement environment. The method was verified and confirmed by a series of measurements with passive components reducing the disturbance. The results of the measurements made it possible to obtain suitable EMI reduction solutions, which can be used to protect commutators or end consumers. The results obtained make it possible to apply the method to measurements of multichannel circuit breakers, in which measuring the turn-on time of individual channels is important for the correct operation of the devices.
W artykule przedstawiono szybką, niezawodną i przenośną metodę pomiaru zaburzeń elektromagnetycznych w obwodach nN (wyłączniki nadprądowe). Eksperyment przeprowadzono w warunkach odzwierciedlających rzeczywiste środowisko pomiarowe. Metoda została zweryfikowana i potwierdzona serią pomiarów z elementami pasywnymi redukującymi zaburzenia. Wyniki pomiarów pozwoliły na uzyskanie odpowiednich rozwiązań redukcji zaburzeń elektromagnetycznych. Dobrane komponenty mogą być wykorzystane do ochrony komutatorów lub odbiorników końcowych. Uzyskane wyniki pozwalają na zastosowanie metody do pomiarów wyłączników wielobiegunowych, w których pomiar czasu załączenia poszczególnych biegunów jest istotny dla poprawnej pracy urządzeń.
Źródło:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2021, 11, 4; 55--61
2083-0157
2391-6761
Pojawia się w:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dokładność rozwiązania w konwencjonalnej oraz szybkiej wielobiegunowej metodzie elementów brzegowych
The accuracy of solutions in conventional and fast multipole boundary element method
Autorzy:
Rynkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/404067.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Symulacji Komputerowej
Tematy:
metoda elementów brzegowych
szybka wielobiegunowa metoda elementów brzegowych
dokładność rozwiązania
conventional BEM
fast multipole method FMM
accuracy of solution
Opis:
W pracy przedstawiono porównanie dokładności rozwiązania dwuwymiarowego pola temperatury przy wykorzystaniu klasycznej metody elementów brzegowych oraz szybkiej wielobiegunowej metody elementów brzegowych (ang.: Fast Multipole Method FMM). Porównano rozwiązanie zagadnienia przy różnym stopniu dyskretyzacji Unii brzegowej. Przedstawiono czas obliczeń dla obu metod.
The purpose of this article is to attempt to compare the accuracy of numerical solution for the conventional and fast multipole boundary element method, with different panels number on boundary area. The paper presents a comparison of the accuracy of solutions for interior points and especially the points located near the edge of the area. The calculation time were compared.
Źródło:
Symulacja w Badaniach i Rozwoju; 2014, 5, 1; 19-28
2081-6154
Pojawia się w:
Symulacja w Badaniach i Rozwoju
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Level-set based segmentation of carotid arteries in computed tomography angiography images
Autorzy:
Pięciak, T.
Baran, M.
Urbańczyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/333312.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
segmentacja obrazu
zbiór poziomu progowego
angiografia tomografii komputerowej
tętnice szyjne
image segmentation
threshold level set
fast marching method
computed tomography angiography
carotid arterie
Opis:
In this paper a segmentation algorithm of carotid arteries on computed tomography angiography (CTA) images is proposed. The algorithm is based on the threshold level set approach. In the basic version, the algorithm analyzes CTA slices beginning at the brachiocephalic trunk and going towards carotid arteries. Second variant of the algorithm performs segmentation in the opposite direction, which implies that the algorithm can follow branches e.g. subclavian arteries. The localization process of the initial contour, for threshold level set method, on the first slice is based on curvature anisotropic diffusion filter, the Gaussian filter and fast marching method. The article contains segmentation results for tested sets of method parameters. Experimental results show that optimal set of parameters ensuring that the threshold level set method performs segmentation of the entire subclavian arteries, does not exist.
Źródło:
Journal of Medical Informatics & Technologies; 2011, 17; 281-286
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation of Neurotransmitter Transport in a Presynaptic Bouton of a Neuron
Autorzy:
Siwek, Bartlomiej
Powiązania:
https://bibliotekanauki.pl/articles/1373424.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
numeric simulation
Galerkin method
fast transport
neurotransmitter
presynaptic button
Opis:
In this paper the results of numerical simulation of neurotransmitter fast transport in a presynaptic bouton of a biological neuron are presented. A mathematical model governing the transport that is fully described in [2] is recalled. A numerical simulation scheme, used parameters and their origins are described. Finally, the results of the simulation are presented.
Źródło:
Schedae Informaticae; 2010, 19; 9-22
0860-0295
2083-8476
Pojawia się w:
Schedae Informaticae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Voltage Security Assessment of Power System
Autorzy:
Chowdhury, Amit Kumar
Mondal, Surajit
Alam, S. K. Mehboob
Pal, Jagadish
Powiązania:
https://bibliotekanauki.pl/articles/1193939.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
1P-1Q Method
Fast Decoupled Load flow
Voltage Collapse
Voltage Performance index
Voltage Stability
Voltage insecurity
Opis:
This paper deals with the security aspects of power system by evaluating the severity of transmission line outage. Voltage security assessment is made by determining the power flow in the line using load flow for each contingency. The severity of contingency is measured using a scalar index called Voltage performance index. 1P-1Q Method and Fast Decoupled load flow are used as approximate and exact load flow methods for Voltage security assessment respectively. Contingency analysis is carried out and ranked lists in the decreasing order of severity based on Voltage Performance Index values are prepared for standard test systems. The severity of line is evaluated and compared using these load flow methods.
Źródło:
World Scientific News; 2015, 21; 36-50
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Order-disorder structural transitions in synthetic filaments of fast and slow skeletal muscle myosins under relaxing and activating conditions.
Autorzy:
Podlubnaya, Zoya
Malyshev, Sergey
Nieznański, Krzysztof
Stępkowski, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/1044221.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
method of slow skeletal muscle myosin preparation.
Ca2+-induced structural transitions
myosin filaments
fast and slow skeletal muscle myosin
Opis:
In the previous study (Podlubnaya et al., 1999, J. Struc. Biol. 127, 1-15) Ca2+-induced reversible structural transitions in synthetic filaments of pure fast skeletal and cardiac muscle myosins were observed under rigor conditions (-Ca2+/+ Ca2+). In the present work these studies have been extended to new more order-producing conditions (presence of ATP in the absence of Ca2+) aimed at arresting the relaxed structure in synthetic filaments of both fast and slow skeletal muscle myosin. Filaments were formed from column-purified myosins (rabbit fast skeletal muscle and rabbit slow skeletal semimebranosus proprius muscle). In the presence of 0.1 mM free Ca2+, 3 mM Mg2+ and 2 mM ATP (activating conditions) these filaments had a spread structure with a random arrangement of myosin heads and subfragments 2 protruding from the filament backbone. Such a structure is indistinguishable from the filament structures observed previously for fast skeletal, cardiac (see reference cited above) and smooth (Podlubnaya et al., 1999, J. Muscle Res. Cell Motil. 20, 547-554) muscle myosins in the presence of 0.1 mM free Ca2+. In the absence of Ca2+ and in the presence of ATP (relaxing conditions) the filaments of both studied myosins revealed a compact ordered structure. The fast skeletal muscle myosin filaments exhibited an axial periodicity of about 14.5 nm and which was much more pronounced than under rigor conditions in the absence of Ca2+ (see the first reference cited). The slow skeletal muscle myosin filaments differ slightly in their appearance from those of fast muscle as they exhibit mainly an axial repeat of about 43 nm while the 14.5 nm repeat is visible only in some regions. This may be a result of a slightly different structural properties of slow skeletal muscle myosin. We conclude that, like other filaments of vertebrate myosins, slow skeletal muscle myosin filaments also undergo the Ca2+-induced structural order-disorder transitions. It is very likely that all vertebrate muscle myosins possess such a property.
Źródło:
Acta Biochimica Polonica; 2000, 47, 4; 1007-1017
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of MIMO system over fast fading channels
Modelowanie systemów MIMO w środowisku zaników szybkich
Autorzy:
Pawelec, J.
Krawczyk, Z.
Kosmowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/251812.pdf
Data publikacji:
2012
Wydawca:
Instytut Naukowo-Wydawniczy TTS
Tematy:
MIMO system
multiple input multiple output
Alamouti
fast fading channel
SISO systems
Monte Carlo method
system MIMO
środowisko zaników szybkich
SISO
metoda Monte Carlo
Opis:
Two models of the Alamouti multiple input – multiple output (MIMO) system have been formed: the analytical and simulation one. The first model is simple and it reflects the quasi-static Rayleigh fading phenomena, while the second one is advanced and it expresses the fast fading effects. The results of analysis and simulations show that the Alamouti MIMO architecture significantly over performs the SISO systems (the SNR gain ~20 dB), but mainly within the quasi-static environment. In mobile conditions this gain and/or the overall system capacity under go a sharp decline.
W referacie poddano eksperymentom symulacyjnym dwa modele MIMO Almaoutiego. Model funkcjonujący w warunkach quasi-statycznych zaników Rayleigha oraz w warunkach zaników szybkich Nakagami’ego. Dokonano oszacowania jaki jest rzeczywisty zysk zastosowania MIMO względem systemu jednokanałowego SISO. W modelowaniu wykorzystano Metodę Monte Carlo.
Źródło:
TTS Technika Transportu Szynowego; 2012, 9; 285-290, CD
1232-3829
2543-5728
Pojawia się w:
TTS Technika Transportu Szynowego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A high-accuracy method of computation of X-ray waves propagation through an optical system consisting many lenses
Autorzy:
Kshevetskii, S.
Wojda, P.
Powiązania:
https://bibliotekanauki.pl/articles/1938594.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska
Tematy:
X-ray wave
X-ray optic
lens
non-uniform medium
focusing
numerical method
simulation
finite differences
stability
numerical error
wave phase
electromagnetic wave
fast oscillating function
Opis:
The propagation of X-ray waves through an optical system consisting of many X-ray refractive lenses is considered. Two differential equations are contemplated for solving the problem for electromagnetic wave propagation: first – an equation for the electric field, second – an equation derived for a complex phase of an electric field. Both equations are solved by the use of a finite-difference method. The simulation error is estimated mathematically and investigated. The presented results for equations show that in order to establish a high accuracy computation a much smaller number of points is needed to solve the problem of X-ray waves propagation through a multi-lens system when the method for the second equation is used. The reason for such a result is that the electric field of a wave after passing through many lenses is a quickly oscillating function of coordinates, while the electric field phase is a quickly increasing, but not oscillating function. Therefore, a very detailed difference grid, which is necessary to approximate the considered electric field can be replaced by not such a detailed grid, when computations are made for the complex wave of the electric field. The simulation error of both suggested methods is estimated. It is shown that the derived equation for a phase function allows efficient simulation of propagation of X-rays for the multi-lens optical system.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2016, 20, 2; 171-186
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
NFTSM control of direct yaw moment for autonomous electric vehicles with consideration of tire nonlinear mechanical properties
Autorzy:
Sun, Xiaoqiang
Wang, Yujun
Cai, Yingfeng
Wong, Pak Kin
Chen, Long
Powiązania:
https://bibliotekanauki.pl/articles/2173619.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
autonomous electric vehicles
direct yaw moment control
DYC
tire nonlinear mechanical properties
nonsingular fast terminal sliding mode
NFTSM
trust-region interior-point method
pojazd elektryczny autonomiczny
kontrola momentu odchylenia bezpośrednia
właściwości mechaniczne opon nieliniowe
niesingularny tryb szybkiego przesuwania terminala
metoda punktu wewnętrznego regionu zaufania
Opis:
To improve the curve driving stability and safety under critical maneuvers for four-wheel-independent drive autonomous electric vehicles, a three-stage direct yaw moment control (DYC) strategy design procedure is proposed in this work. The first stage conducts the modeling of the tire nonlinear mechanical properties, i.e. the coupling relationship between the tire longitudinal force and the tire lateral force, which is crucial for the DYC strategy design, in the STI (Systems Technologies Inc.) form based on experimental data. On this basis, a 7-DOF vehicle dynamics model is established and the direct yaw moment calculation problem of the four-wheel-independent drive autonomous electric vehicle is solved through the nonsingular fast terminal sliding mode (NFTSM) control method, thus the optimal direct yaw moment can be obtained. To achieve this direct yaw moment, an optimal allocation problem of the tire forces is further solved by using the trust-region interior-point method, which can effectively guarantee the solving efficiency of complex optimization problem like the tire driving and braking forces allocation of four wheels in this work. Finally, the effectiveness of the DYC strategy proposed for the autonomous electric vehicles is verified through the CarSim-Simulink co-simulation results.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 3; art. no. e137065
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
NFTSM control of direct yaw moment for autonomous electric vehicles with consideration of tire nonlinear mechanical properties
Autorzy:
Sun, Xiaoqiang
Wang, Yujun
Cai, Yingfeng
Wong, Pak Kin
Chen, Long
Powiązania:
https://bibliotekanauki.pl/articles/2128162.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
autonomous electric vehicles
direct yaw moment control
DYC
tire nonlinear mechanical properties
nonsingular fast terminal sliding mode
NFTSM
trust-region interior-point method
pojazd elektryczny autonomiczny
kontrola momentu odchylenia bezpośrednia
właściwości mechaniczne opon nieliniowe
niesingularny tryb szybkiego przesuwania terminala
metoda punktu wewnętrznego regionu zaufania
Opis:
To improve the curve driving stability and safety under critical maneuvers for four-wheel-independent drive autonomous electric vehicles, a three-stage direct yaw moment control (DYC) strategy design procedure is proposed in this work. The first stage conducts the modeling of the tire nonlinear mechanical properties, i.e. the coupling relationship between the tire longitudinal force and the tire lateral force, which is crucial for the DYC strategy design, in the STI (Systems Technologies Inc.) form based on experimental data. On this basis, a 7-DOF vehicle dynamics model is established and the direct yaw moment calculation problem of the four-wheel-independent drive autonomous electric vehicle is solved through the nonsingular fast terminal sliding mode (NFTSM) control method, thus the optimal direct yaw moment can be obtained. To achieve this direct yaw moment, an optimal allocation problem of the tire forces is further solved by using the trust-region interior-point method, which can effectively guarantee the solving efficiency of complex optimization problem like the tire driving and braking forces allocation of four wheels in this work. Finally, the effectiveness of the DYC strategy proposed for the autonomous electric vehicles is verified through the CarSim-Simulink co-simulation results.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 3; e137065, 1--13
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-15 z 15

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