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Construction and 3D model of stand for investigating a non-ideal forcing in a nonlinear chain dynamics of self-excited oscillators with friction
(Wydawnictwo Politechniki Łódzkiej, 2021) Rogala, Patryk; Olejnik, Paweł; Awrejcewicz, Jan
The research involves application and research on a non-ideal forcing to modelling and identification of vibrating systems with friction. It is still an innovative approach in the numerical analysis of vibrations of mechatronic machines and devices. This will allow to make a much real numerical modelling and more efficient identification of nonlinear dynamic phenomena observed in vibrating systems with friction, and thus, a better modelling of such phenomena in computer programs. To obtain the goal, initial 3D model of the mechanical stand was made in the CAD software. Based on the 3D model, real stand will be built, and experiments will be held to obtain data that will be necessary to ensure correctness of the mathematical model, which also will be studied and developed.
Drive-by-wire of a converted into electric car Syrena 105 enabling Hardware-In-Loop tests of driving
(Wydawnictwo Politechniki Łódzkiej, 2021) Adamski, Paweł; Olejnik, Paweł
In this work, replacing an electronic throttle pedal and a driver in an electric car converted into electric by a hardware-in-loop workbench is described, highlighting the advantage of drive-by-wire feature that appeared after conversion. Drive-by-wire facilitates replacing a driver by Hardware-In-Loop (HIL) workbench, as instead of simulating a mechanical pedal depression by a servomechanism, electric signals can be transmitted directly from the workbench. Thanks to one-pedal-driving feature of the motor controller used in the car, there is a possibility of performing a variety of road tests replacing only the electronic throttle pedal. Hardware interventions in the car are described and sample HIL test results are presented.
DSTA-2015 Conference Books vol. 1
(Politechnika Łódzka. Wydział Mechaniczny. Katedra Automatyki, Biomechaniki i Mechatroniki., 2015) Awrejcewicz, Jan; Kaźmierczak, Marek; Mrozowski, Jerzy; Olejnik, Paweł
Proceedings of the 13th Conference „Dynamical Systems - Theory and Applications" summarize 164 and the Springer Proceedings summarize 60 best papers of university teachers and students, researchers and engineers from whole the world. The papers were chosen by the International Scientific Committee from 315 papers submitted to the conference. The reader thus obtains an overview of the recent developments of dynamical systems and can study the most progressive tendencies in this field of science.
DSTA-2015 Conference Books vol. 2
(Politechnika Łódzka. Wydział Mechaniczny. Katedra Automatyki, Biomechaniki i Mechatroniki., 2015) Awrejcewicz, Jan; Kaźmierczak, Marek; Mrozowski, Jerzy; Olejnik, Paweł
Proceedings of the 13th Conference „Dynamical Systems - Theory and Applications" summarize 164 and the Springer Proceedings summarize 60 best papers of university teachers and students, researchers and engineers from whole the world. The papers were chosen by the International Scientific Committee from 315 papers submitted to the conference. The reader thus obtains an overview of the recent developments of dynamical systems and can study the most progressive tendencies in this field of science.
DSTA-2015 Conference Books vol. 3
(Politechnika Łódzka. Wydział Mechaniczny. Katedra Automatyki, Biomechaniki i Mechatroniki., 2015) Awrejcewicz, Jan; Kaźmierczak, Marek; Mrozowski, Jerzy; Olejnik, Paweł
Proceedings of the 13th Conference „Dynamical Systems - Theory and Applications" summarize 164 and the Springer Proceedings summarize 60 best papers of university teachers and students, researchers and engineers from whole the world. The papers were chosen by the International Scientific Committee from 315 papers submitted to the conference. The reader thus obtains an overview of the recent developments of dynamical systems and can study the most progressive tendencies in this field of science.
DSTA-2017 Conference Books - Abstracts
(Wydawnictwa Uczelniane Politechniki Łódzkiej, 2017) Awrejcewicz, Jan; Kaźmierczak, Marek; Mrozowski, Jerzy; Olejnik, Paweł
DSTA-2017 Conference Books vol. 1
(Lodz University of Technology Press, 2017) Awrejcewicz, Jan; Kaźmierczak, Marek; Mrozowski, Jerzy; Olejnik, Paweł
DSTA-2017 Conference Books vol. 2
(Lodz University of Technology Press, 2017) Awrejcewicz, Jan; Kaźmierczak, Marek; Mrozowski, Jerzy; Olejnik, Paweł
DSTA-2017 Conference Books vol. 3
(Lodz University of Technology Press, 2017) Awrejcewicz, Jan; Kaźmierczak, Marek; Mrozowski, Jerzy; Olejnik, Paweł
DSTA-2019 Conference Books – Abstracts
(Lodz University of Technology Press, 2019) Awrejcewicz, Jan; Kaźmierczak, Marek; Mrozowski, Jerzy; Olejnik, Paweł
DSTA-2019 Conference Books vol. 2
(Lodz University of Technology Press, 2019) Awrejcewicz, Jan; Kaźmierczak, Marek; Olejnik, Paweł
DSTA-2021 Conference Books – Abstracts
(Lodz University of Technology Press, 2021) Awrejcewicz, Jan; Kaźmierczak, Marek; Mrozowski, Jerzy; Olejnik, Paweł
From Preface: This is the sixteen time when the conference “Dynamical Systems – Theory and Applications” gathers a numerous group of outstanding scientists and engineers, who deal with widely understood problems of theoretical and applied dynamics. Organization of the conference would not have been possible without a great effort of the staff of the Department of Automation, Biomechanics and Mechatronics. The patronage over the conference has been taken by the "Excellent Science" program of the Polish Ministry of Education and Science. It is a great pleasure that our invitation has been accepted by so many people, including good colleagues and friends as well as a large group of researchers and scientists, who decided to participate in the conference for the first time. With proud and satisfaction we welcome 748 authors from 52 countries all over the world. They decided to share the results of their research and many years experiences in the discipline of dynamical systems by submitting many very interesting papers. This booklet contains a collection of 364 abstracts, which have gained the acceptance of referees and have been qualified for publication in the conference edited books.[...]
Identification of a non-linear damping coefficient characteristics in the free decay test of a single pendulum with friction.
(Politechnika Łódzka. Wydział Mechaniczny. Katedra Automatyki, Biomechaniki i Mechatroniki., 2015) Awrejcewicz, Jan; Olejnik, Paweł
A pendulum in form of an equal arms angle body being a part of a two degrees-of-freedom mechanical system with friction is identified with respect to the observed in uence of some resistance of its rotational motion in ball bearings. It is damped in a much more complex manner, what could be considered as a non-linear damping. There is supposed between others, that the effective non-linear damping characteristics depends on a few effects such as fluid friction caused by vibrations of the pendulum with two springs in the air, as well as unknown kinds of a frictional resistance existing in ball bearings. The model under investigation finds its real realization on a laboratory rig designed for experimental investigations of viscous and structural frictional effects. A transient response oscillations of the pendulum are described by the explicitly state-dependent free decay. A free decay test of the pendulum with the state dependent non-linear parameters of damping and stiffness has been performed in this paper. It provided interesting observations that led to elaboration of a method of the overall damping coefficient identification. Effects of application of the proposed semi-empirical method of identification of the overall damping and stiffness coefficients have been illustrated and discussed.
Influence of a relatively high frequency structure vibrations on the dynamics of real stick-slip motion
(Wydawnictwo Politechniki Łódzkiej, 2021) Olejnik, Paweł; Górniak vel Górski, Adrian; Cebulak, Maciej; Awrejcewicz, Jan
The work concerns the research on the impact of structure vibrations on the dynamics of frictional contact of bodies moving in relation to each other and remaining in frictional contact, causing a stick-slip motion. A literature review was carried out, describing mainly the phenomena concerning friction, but also the dynamics of vibrations and non-ideal energy sources that induce system oscillations. In the next step an experimental station for investigation of friction equipped with a new subsystem inducing high-frequency vibrations is presented to propose a modified physical model of the investigated frictional system. After analysing the most important factors influencing the behavior of the tested system, a mathematical description was prepared, which in theory showed the potential influence of the attached subsystem on the dynamics of the movement of the tested object - the frictional connection. Various methods of implementing the unbalance of rotors, being the source of highfrequency excitation, have been considered. At the final stage, a series of measurements of the displacement of the vibrating block on the moving belt was performed with the highfrequency excitation turned on and off. The prepared graphs were used to analyse the dynamics of frictional contact and the impact of non-autonomous vibrations on the occurrence of the stick-slip phenomenon.
Matematyczne i numeryczne metody analizy bifurkacji i dynamiki chaotycznej układów mechanicznych z tarciem i uderzeniami
(Wydawnictwo Politechniki Łódzkiej, 2006) Awrejcewicz, Jan; Pyryev, Jurij; Kudra, Grzegorz; Olejnik, Paweł; Wydział Mechaniczny. Politechnika Łódzka.; Faculty of Mechanical Engineering. Lodz University of Technology.; Kapitaniak, Tomasz; Wodziński, Piotr; Kaźmierczak, Marek; Olejnik, Paweł; Jakubowski, Krzysztof; Świder, Jerzy; Grądzki, Ryszard
Książka obejmuje wprowadzenie do podstaw teoretycznych, modelowania i metod numerycznych, związanych z analizą dynamiki bifurkacyjnej i chaotycznej układów mechanicznych z tarciem i uderzeniami. Autorzy przedstawiają oryginalne metody modelowania i analizy wybranych układów mechanicznych niegładkich oraz prezentują nowe wyniki uzyskane w tym obszarze dynamiki nieliniowej układów dyskretnych.
Mathematical Modelling of an extended Swinging Atwood Machine
(Wydawnictwo Politechniki Łódzkiej, 2021) Yakubu, Godiya; Olejnik, Paweł; Awrejcewicz, Jan
An extended model for a variable-length pendulum’s mechanical application is being derived from the Swinging Atwood Machine (SAM). An electrical component consisting of an electromagnet and armature coil is attached on the link connected to the counterweight mass on the left-hand side of the modified SAM to provide an excitation force for the system when an electric current is induced. The extended SAM presents a novel SAM concept being derived from a variable-length double pendulum with a suspension between the two pendulums. The equations of motion are simulated to see the trajectory of the two pendulums. The results of original numerical simulations show some compact regions of attraction at some regimes. Therefore, the extended SAM’s nonlinear dynamics presented in the current work can be thoroughly studied, and more modifications can be achieved. The new technique can reduce residual vibrations through damping when the desired level of the crane is reached. It can also be used in simple mechatronic and robotic systems.
Metody numeryczne rozwiązywania, analizy i kontroli nieciągłych układów dynamicznych.
(Wydawnictwo Politechniki Łódzkiej, 2013) Olejnik, Paweł
Praca przedstawia opis metod matematycznych i procedur numerycznych służących do rozwiązywania zagadnień modelowania i sterowania nieciągłych układów dynamicznych. Uzyskanie pożądanej dokładności rozwiązania równań różniczkowych modelujących stan układu dynamicznego z tarciem, niejednoznacznością parametrów lub opóźnieniem czasowym wymaga stosowania metod dedykowanych. Rozwiązywanie i analiza układów nieciągłych związana z poprawa wydajności metod numerycznych odkrywa istniejący zakres trudności, wyodrębniając interesujące oszacowania i wyprowadzenia matematyczne opisane w tej monografii. Pozwala to na lepsze zrozumienie i dokładniejsze przybliżenie procesów fizycznych zachodzących w rzeczywistych układach drgających.
Modelowanie i optymalizacja dyskretnych układów mechatronicznych
(Wydawnictwa Politechniki Łódzkiej, 2015) Olejnik, Paweł; Awrejcewicz, Jan; Lewandowski, Donat
Postęp cywilizacyjny stał się przyczynkiem do rozwoju nauk interdyscyplinarnych. Na tym gruncie rozwinęła się mechatronika – nowoczesna dziedzina nauki, obejmująca doskonale opanowaną mechanikę, nowszą elektronikę oraz równolegle formowaną wiedzę z zakresu symulacji numerycznych, sterowania i optymalizacji. Te ostatnie stawiają mechanikę układów dynamicznych i elektronikę w całkiem nowej roli. Są one podstawą projektów mechatronicznych o znaczeniu eksperymentalnym – poznawczym i praktycznym – aplikacyjnym. Z tego względu, inżynier mechatronik, automatyk lub elektronik powinien czerpać wiedzę użyteczną i nabywać takie umiejętności, które pozwolą mu sprostać wyzwaniom technicznym na miarę XXI wieku. Przyszły inżynier-naukowiec to coraz częściej student nauk technicznych. Wiedza techniczna oraz przekonanie o potrzebie jej wykorzystania zyskuje na znaczeniu, ponieważ wiąże się z rozwojem cywilizacyjnym. Wymierne korzyści obejmują wytwarzanie dóbr materialnych, poprawiających jakość życia ludzi, składowanie i transport towarów, komunikację i telekomunikację, automatyzację procesów technologicznych, produkcję i dostawy energii, wydobycie surowców, opanowanie środowiska naturalnego, unowocześnienie struktur wojskowych, loty w przestrzeń kosmiczną i wiele innych. Wynika z tego, że programy kształcenia studentów na kierunkach technicznych muszą być na bieżąco dostosowywane do pędzącego postępu cywilizacyjnego. Zagadnienia o charakterze teoretycznym i doświadczalnym podejmowane w tej monografii wychodzą temu naprzeciw.
Occurrence of strick-slip phenomenon.
(Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2007) Awrejcewicz, Jan; Olejnik, Paweł
A self-excited system wit h unilateral friction contact modelled by a two degrees-of-freedom mechanical system, where the normaI farce varies during displacement of a block has been studied. The constructed real laboratory rig approximates the investigated system, and it includes feedback reinforcement of the friction force acting on the vibrated block. Some methods of data acquisition and data handling procedures are proposed for experimentally observed results and data collection. A novel static friction force model for both positive and negative velocities of the base is proposed.