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Wyświetlanie 1-15 z 23
Tytuł:
An investigation of the suspension characteristics of the line model of the vehicle using the Taguchi method
Autorzy:
Stojanovic, Nadica
Jweeg, Muhsin Jaber
Grujic, Ivan
Petrovic, Miroslav
Muhsen, Sami
Abdullah, Oday I.
Powiązania:
https://bibliotekanauki.pl/articles/27312405.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
ANOVA
dynamika pionowa
układ zawieszenia
vertical dynamics
MATLAB/SIMULINK
comfort
Opis:
It can be considered that the suspension system is one of the most important systems in the VEHICLE. Where it is responsible for the stability and balance of the vehicle’s structure on the roads and curves to ensure the comfort of passengers. Also, it absorbs the shocks resulting from the unevenness of the road and prevents it from reaching the wheelhouse. The influence of the suspension constructive parameters in order to obtain the smallest level of displacements of the sprung mass has been investigated. The following control parameters are the stiffness of the sprung, unsprung mass, and the damping of the sprung mass. The parameter which affects most displacements of the sprung mass was determined by applying the analysis of variance (ANOVA). The investigation was conducted using MATLAB/SIMULINK software, and a line model of a quarter of the vehicle was created. It was determined that the stiffness of sprung has the most significant influence on the displacement of the sprung-mass, which further affect the vehicle’s comfort.
Źródło:
International Journal of Applied Mechanics and Engineering; 2022, 27, 4; 170--178
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wykrywanie uszkodzeń konstrukcji na podstawie analizy zmian parametrów dynamicznych
Structural damage detection based on changes in dynamic parameters
Autorzy:
Ziaja, D.
Miller, B.
Powiązania:
https://bibliotekanauki.pl/articles/371976.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
uszkodzenia konstrukcji
detekcja uszkodzeń
dynamika
SHM
structural damage
damage detection
dynamics
Opis:
W artykule zaprezentowano ideę monitorowania stanu konstrukcji jako działania wspierającego ochronę środowiska. Przedstawiono, na przykładzie badań dwukondygnacyjnej ramy portalowej, wstępną propozycję procedury umożliwiającej detekcję uszkodzeń połączeń w badanej konstrukcji. Prezentowane w opracowaniu wnioski bazują na pomiarach przyspieszeń w wybranych punktach konstrukcji poddanej wzbudzeniu dynamicznemu. Jako narzędzie do analizy zmian parametrów dynamicznych układu wykorzystano jednowarstwowe, jednokierunkowe sztuczne sieci neuronowe.
The article presents the idea of structural health monitoring as a supporting action to protect the environment. The preliminary proposal of a procedure enabling the damage detection of the joints is shown on the example of a two-storey portal frame. Conclusions, presented in the paper, based on the measurement of accelerations in selected points of structure, subjected to dynamic excitation. Single-layer, feed-forward artificial neural networks were used as a tool for the analysis of changes in the dynamic parameters.
Źródło:
Zeszyty Naukowe. Inżynieria Środowiska / Uniwersytet Zielonogórski; 2017, 166 (46); 75-84
1895-7323
Pojawia się w:
Zeszyty Naukowe. Inżynieria Środowiska / Uniwersytet Zielonogórski
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solvability and Asymptotic Behavior of a Population Problem Taking into Account Random Mating and Females Pregnancy
Autorzy:
Skakauskas, V.
Powiązania:
https://bibliotekanauki.pl/articles/929725.pdf
Data publikacji:
2000
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
dynamika populacji
migracja
population dynamics
random mating
gestation of females
migration
Opis:
Two deterministic age-sex-structured population dynamics models are discussed taking into account random mating of sexes (without formation of permanent male-female couples), possible destruction of the fetus (abortion), and female's pregnancy. One of them deals with both random and directed diffusion in the whole space while in the other the population is assumed to be nondispersing. The population consists of three components: one maleand two female, the latter two being the single (nonfertilized) female and the fertilized one. The case of a separable solution of the limited nondispersing population (in which death moduli can be decomposed into the sum of two terms where one of them depends on time and age and theother is a function of time and the population size) is analyzed. The existence of a unique solution of the Cauchy problem for the nondispersing population model is proved and its longtime behavior is demonstrated. An analogous situation for the dispersing population is analyzed, too.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2000, 10, 1; 37-61
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Capture efficiency of magnetically labeled particles traveling through an intracranial aneurysm
Autorzy:
Cardona, M.
Ramírez, J.
Benavides-Moran, A. G.
Powiązania:
https://bibliotekanauki.pl/articles/1839903.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
magnetohydrodynamika
dynamika płynów
śródbłonek
endothelization
particle manipulation
computational fluid dynamics
magnetohydrodynamics
Opis:
Cell manipulation using external magnetic fields has been proposed to accelerate the neck reendothelization of saccular unruptured stented intracranial aneurysms. This work presents a computational fluid dynamics (CFD) model of a Saccular Brain Aneurysm that incorporates a helicoidal stent. An Eulerian-Lagrangian model implemented in ANSYS-Fluent is used to simulate the hemodynamics in the aneurysm. In silico studies have been conducted to describe the incidence of the magnetic field direction, frequency and amplitude on the blood hemodynamics and particle capture efficiency, when an external magnetic field is used to trap magnetically labeled particles traveling through the aneurysm. It is found that the magnetic field direction affects the particle concentration in the target region. Simulation results show that the highest particle capture efficiency is obtained with a 1T magnetic field amplitude in an open bore MRI scanner, when a permanent magnet is used.
Źródło:
International Journal of Applied Mechanics and Engineering; 2021, 26, 1; 65-75
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonlinear vibrations of orthogonal mechanism of shaking table
Autorzy:
Bissembayev, K.
Iskakov, Z.
Powiązania:
https://bibliotekanauki.pl/articles/955226.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
dynamika
stabilność
prędkość kątowa
orthogonal mechanism
dynamics
asymptotic method
essentially nonlinearity
stability
Opis:
The dynamics of orthogonal mechanism in the presence of a shaking table of fixed cargo is studied. The focus is on the vibrational motion of the mechanism in slow-speed motor rotation. The analysis of the solutions for motion nonlinear equations showed that the angular velocity of the guiding link oscillates according to the harmonic law about a mean value. The character of changing its amplitude, depending on the weight of the cargo and the length of the guiding link, is determined. Dependence of the mean angular velocity on the motor torque is set.
Źródło:
International Journal of Applied Mechanics and Engineering; 2014, 19, 3; 487-501
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An interval estimator for chlorine monitoring in drinking water distribution systems under uncertain system dynamics, inputs and chlorine concentration measurement errors
Autorzy:
Łangowski, R.
Brdys, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/330246.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
observer
bounding method
modelling dynamics
water quality
obserwator
dynamika modelowania
jakość wody
Opis:
The design of an interval observer for estimation of unmeasured state variables with application to drinking water distribution systems is described. In particular, the design process of such an observer is considered for estimation of the water quality described by the concentration of free chlorine. The interval observer is derived to produce the robust interval bounds on the estimated water quality state variables. The stability and robustness of the interval observer are investigated under uncertainty in system dynamics, inputs, initial conditions and measurement errors. The bounds on the estimated variables are generated by solving two systems of first-order ordinary differential equations. For that reason, despite a large scale of the systems, the numerical efficiency is sufficient for the on-line monitoring of the water quality. Finally, in order to validate the performance of the observer, it is applied to the model of a real water distribution network.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2017, 27, 2; 309-322
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Markov chain model of phytoplankton dynamics
Autorzy:
Wieczorek, R.
Powiązania:
https://bibliotekanauki.pl/articles/908138.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
dynamika fitoplanktonu
koagulacja
fragmentacja
łańcuch Markowa
phytoplankton dynamics
coagulation
fragmentation
Markov chains
Opis:
A discrete-time stochastic spatial model of plankton dynamics is given. We focus on aggregative behaviour of plankton cells. Our aim is to show the convergence of a microscopic, stochastic model to a macroscopic one, given by an evolution equation. Some numerical simulations are also presented.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2010, 20, 4; 763-771
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of dynamics of a wheeled mobile robot with mecanum wheels with the use of Lagrange equations of the second kind
Autorzy:
Hendzel, Z.
Rykała, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/266008.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
wheeled mobile robots
mecanum wheels
mathematical model
robot mobilny
model matematyczny
dynamika obiektu
Opis:
The work presents the dynamic equations of motion of a wheeled mobile robot with mecanum wheels derived with the use of Lagrange equations of the second kind. Mecanum wheels are a new type of wheels used in wheeled mobile robots and they consist of freely rotating rollers attached to the circumference of the wheels. In order to derive dynamic equations of motion of a wheeled mobile robot, the kinetic energy of the system is determined, as well as the generalised forces affecting the system. The resulting mathematical model of a wheeled mobile robot was generated with the use of Maple V software. The results of a solution of inverse and forward problems of dynamics of the discussed object are also published.
Źródło:
International Journal of Applied Mechanics and Engineering; 2017, 22, 1; 81-99
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A general on-the-fly algorithm for modifying the kinematic tree hierarchy
Autorzy:
Stępień, J.
Polański, A.
Wojciechowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/331314.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
dynamika
animacja
bryła sztywna
dynamics
articulated system
rigid bodies
system hierarchy
contact
animation
Opis:
When conducting a dynamic simulation of a multibody mechanical system, the model definition may need to be altered during the simulation course due to, e.g., changes in the way the system interacts with external objects. In this paper, we propose a general procedure for modifying simulation models of articulated figures, particularly useful when dealing with systems in time-varying contact with the environment. The proposed algorithm adjusts model connectivity, geometry and current state, producing its equivalent ready to be used by the simulation procedure. Furthermore, we also provide a simple usage scenario-a passive planar biped walker.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2012, 22, 2; 423-435
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonlinear analysis of vehicle control actuations based on controlled invariant sets
Autorzy:
Németh, B.
Gáspár, P.
Péni, T.
Powiązania:
https://bibliotekanauki.pl/articles/331245.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
vehicle dynamics
sum of squares programming
Lyapunov method
dynamika pojazdu
metoda Lapunowa
analiza nieliniowa
Opis:
In the paper, an analysis method is applied to the lateral stabilization problem of vehicle systems. The aim is to find the largest state-space region in which the lateral stability of the vehicle can be guaranteed by the peak-bounded control input. In the analysis, the nonlinear polynomial sum-of-squares programming method is applied. A practical computation technique is developed to calculate the maximum controlled invariant set of the system. The method calculates the maximum controlled invariant sets of the steering and braking control systems at various velocities and road conditions. Illustration examples show that, depending on the environments, different vehicle dynamic regions can be reached and stabilized by these controllers. The results can be applied to the theoretical basis of their interventions into the vehicle control system.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2016, 26, 1; 31-43
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The dynamic characteristic and hysteresis effect of an air spring
Autorzy:
Locken, F.
Welsch, M.
Powiązania:
https://bibliotekanauki.pl/articles/264476.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
air springs
dynamic characteristic
transfer thermodynamic to mechanic
dynamika pojazdu
sprężyna powietrzna
sprężyna gazowa
Opis:
In many applications of vibration technology, especially in chassis, air springs present a common alternative to steel spring concepts. A design-independent and therefore universal approach is presented to describe the dynamic characteristic of such springs. Differential and constitutive equations based on energy balances of the enclosed volume and the mountings are given to describe the nonlinear and dynamic characteristics. Therefore all parameters can be estimated directly from physical and geometrical properties, without parameter fitting. The numerically solved equations fit very well to measurements of a passenger car air spring. In a second step a simplification of this model leads to a pure mechanical equation. While in principle the same parameters are used, just an empirical correction of the effective heat transfer coefficient is needed to handle some simplification on this topic. Finally, a linearization of this equation leads to an analogous mechanical model that can be assembled from two common spring- and one dashpot elements in a specific arrangement. This transfer into ”mechanical language” enables a system description with a simple force-displacement law and a consideration of the nonobvious hysteresis and stiffness increase of an air spring from a mechanical point of view.
Źródło:
International Journal of Applied Mechanics and Engineering; 2015, 20, 1; 127-145
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Iterative methods for efficient sampling-based optimal motion planning of nonlinear systems
Autorzy:
Ha, J. S.
Choi, H. L.
Jeon, J. H.
Powiązania:
https://bibliotekanauki.pl/articles/330028.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
optimal motion planning
sampling based algorithm
nonlinear dynamics
planowanie ruchu
algorytm próbkowania
dynamika nieliniowa
Opis:
This paper extends the RRT* algorithm, a recently developed but widely used sampling based optimal motion planner, in order to effectively handle nonlinear kinodynamic constraints. Nonlinearity in kinodynamic differential constraints often leads to difficulties in choosing an appropriate distance metric and in computing optimized trajectory segments in tree construction. To tackle these two difficulties, this work adopts the affine quadratic regulator-based pseudo-metric as the distance measure and utilizes iterative two-point boundary value problem solvers to compute the optimized segments. The proposed extension then preserves the inherent asymptotic optimality of the RRT* framework, while efficiently handling a variety of kinodynamic constraints. Three numerical case studies validate the applicability of the proposed method.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2018, 28, 1; 155-168
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Periodicity of the Population Size of an Age-Dependent Model With a Dominant Age Class by Means of Impulsive Perturbations
Autorzy:
Covachev, V.
Powiązania:
https://bibliotekanauki.pl/articles/929760.pdf
Data publikacji:
2000
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
dynamika populacji
równanie nieliniowe
population dynamics
age-dependent model
periodic solutions
nonlinear delay equations
Opis:
For an age-dependent model with a dominant age class an w-periodic regime of the population size is sought by means of impulsive perturbations. For both noncritical and critical cases of first order the problem is reduced to operator systems solvable by a convergent simple iteration method.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2000, 10, 1; 147-155
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spike patterns and chaos in a map-based neuron model
Autorzy:
Bartłomiejczyk, Piotr
Llovera Trujillo
Signerska-Rynkowska, Justyna
Powiązania:
https://bibliotekanauki.pl/articles/24200689.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
neuronal dynamics
β-transformations
Farey–Lorenz permutations
periodic spiking
chaos
dynamika neuronalna
permutacje Fareya-Lorenza
Opis:
The work studies the well-known map-based model of neuronal dynamics introduced in 2007 by Courbage, Nekorkin and Vdovin, important due to various medical applications. We also review and extend some of the existing results concerning β-transformations and (expanding) Lorenz mappings. Then we apply them for deducing important properties of spike-trains generated by the CNV model and explain their implications for neuron behaviour. In particular, using recent theorems of rotation theory for Lorenz-like maps, we provide a classification of periodic spiking patterns in this model.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2023, 33, 3; 395--408
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Statistical estimation of the dynamics of watershed dams
Autorzy:
Tabor, Z.
Powiązania:
https://bibliotekanauki.pl/articles/907666.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
segmentacja hierarchiczna
dynamika konturowa
morfologia matematyczna
analiza statystyczna
hierarchical segmentation
contour dynamics
mathematical morphology
statistical analysis
Opis:
In the present study the notion of watershed contour dynamics, defined within the framework of mathematical morphology, is examined. It is shown that the dynamics are a direct measure of the 'sharpness' of transition between neighboring watershed basins. The expressions for the expected value and the statistical error of the estimation of contour dynamics are derived in the presence of noise, based on extreme value theory. The sensitivity of contour dynamics to noise is studied. A statistical approach to the notion of contour dynamics is developed and a definition of statistical dynamics is proposed.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2009, 19, 2; 349-360
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 23

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