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Your search keyword '"Margielewicz, Jerzy"' showing total 138 results
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138 results on '"Margielewicz, Jerzy"'

2. Influence of the potential barrier switching frequency on the effectiveness of energy harvesting

Author

Margielewicz, Jerzy, Gaska, Damian, Litak, Grzegorz, Haniszewski, Tomasz, Wolszczak, Piotr, and Trigona, Carlo

Subjects
Physics - Applied Physics, Nonlinear Sciences - Adaptation and Self-Organizing Systems
Abstract

Dynamical systems for kinetic energy harvesting have recently been designed that use nonlinear mechanical resonators and corresponding transducers to create electrical output. Nonlinearities are important for providing a broadband input frequency efficiency, which is necessary to ensure that the output voltage is at a satisfactory level in the case of a variable ambient vibration source. In this paper, we analyze the dynamics of such a system with the additional possibility of a switching potential barrier in the nonlinear resonator. In order to improve the effectiveness of the energy harvester, we numerically test the possibility of using abrupt changes in the system parameters. We analyze the voltage output for various frequencies of both the harmonic excitations and the potential barrier switching. In a range that includes low and high switching frequencies of potentials, the periodic solutions dominate in the bifurcation diagrams. With regard to the large switching frequency, the effective values of the voltage at the piezoelectric electrodes are significantly reduced. The highest effective values of the voltage that are induced at the piezoelectric electrodes are observed when the chaotic solutions appear due to their specific ability to pass the potential barrier for relatively small excitation. The results also show that mechanical damping with high-enough magnitudes minimize the influence of the transient states caused by the switching potentials., Comment: 42 pages, 13 figures

Published
2023

3. Impulse excitation diagram as a tool to achieve high energy orbits

Author

Gaska, Damian, Margielewicz, Jerzy, Litak, Grzegorz, Wolszczak, Piotr, and Bucki, Slawomir

Subjects
Electrical Engineering and Systems Science - Systems and Control, Physics - Applied Physics
Abstract

The paper presents the application of a new impulse excitation diagram (IED) to help realize high-energy orbits in nonlinear energy harvesting systems. In the case of non-linearity, we can deal with the occurrence of coexisting solutions and the proposed diagram allows for the use of the impulse excitation method in order to change the solution. For this purpose, the author's IED diagram was presented to determine the characteristics, duration and moment of initiation of the external disturbing impulse in order to jump to another orbit. An application example is the quasizero energy harvester and two different impulse characteristics., Comment: 5 pages, 4 figures

Published
2023
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6. Application of Bond Graphs in Modelling of the Energy Harvesting Systems from Vibrating Mechanical Devices

Author

Margielewicz, Jerzy, Gąska, Damian, Litak, Grzegorz, Haniszewski, Tomasz, Ceccarelli, Marco, Series Editor, Agrawal, Sunil K., Advisory Editor, Corves, Burkhard, Advisory Editor, Glazunov, Victor, Advisory Editor, Hernández, Alfonso, Advisory Editor, Huang, Tian, Advisory Editor, Jauregui Correa, Juan Carlos, Advisory Editor, Takeda, Yukio, Advisory Editor, Zawiślak, Stanisław, editor, and Rysiński, Jacek, editor

Published
2022
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13. Nonlinear dynamics of single-stage gear transmission

Author

Wojnarowski, Józef, Margielewicz, Jerzy, Ceccarelli, Marco, Series Editor, Hernandez, Alfonso, Editorial Board Member, Huang, Tian, Editorial Board Member, Takeda, Yukio, Editorial Board Member, Corves, Burkhard, Editorial Board Member, Agrawal, Sunil, Editorial Board Member, and Uhl, Tadeusz, editor

Published
2019
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44. Identification of Biomechanical Properties of Temporomandibular Discs

Author

Kijak, Edward, Margielewicz, Jerzy, and Pihut, Małgorzata

Subjects
Article Subject
Abstract

Purpose of the Paper. The study was aimed at identifying the biomechanical properties of the temporomandibular disc. Material. Experimental and model tests were conducted on ten fresh porcine temporomandibular joint discs. The average thickness of disc tissue was, accordingly, 2.77 mm for the anterior zone, 3.98 mm for the posterior, and 1.54 mm for the intermediate. The selection of research material in the form of porcine discs was due to the similarity to human discs. Methods. Discs were loaded in cycles, a temporary course with the amplitude 3 N and frequency 0.07 Hz, and growth in the load was 1 N/s. The selection of load frequency was due to real conditions of temporomandibular joint functioning during mastication. The necessary experimental research was conducted on a testing machine with a measurement range of 2.5 kN. Results. The obtained numeric calculation results indicate that the number of load cycles has a decisive impact on the limitation of energy dispersion capacity through disc tissue. This phenomenon was observed in all the studies on the disc areas. Along with the growth in load cycles, discs are stiffened, and the most significant stiffness was observed in the intermediate area. Conclusions. Based on the conducted research, it should be concluded that excessive load affecting temporomandibular joints caused by the act of mastication and occlusal forces generated during parafunction and in people with defined long-term bruxism has crucial importance on biomechanical disc properties and hence the course of temporomandibular joint conditions.

Published
2020
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