Speaker: Grzegorz Litak
Time: 10:00 am, Oct. 28th.
Location: SIST 1A-200
Host: Prof. Junrui Liang
Abstract:
This study presents a nonlinear piezoelectric energy harvesting system enhanced by an auxiliary oscillator, aiming to overcome the narrow bandwidth limitation of traditional linear resonant energy harvesters. A common energy harvesting device uses a piezoelectric patch on a cantilever beam with a tip mass. The usual configuration exploits the linear resonance of the system excited by harmonic force. A cantilever beam with a tip mass that is mounted vertically and excited in the transverse direction at its base is considered. For a frequency broadband effect the non-linear potential is applied. In our system the mass-spring resonator coupled to the piezoelectric is moving in a nonlinear potential together with an additional oscillator which plays a role of nonlinear amplitude amplifier. The electromechanical equations of motion for this system are developed, and its response for a range of parameters is investigated using phase portraits and bifurcation diagrams. We also examine the multiple solutions and associated power outputs. It facilitate the design of nonlinear broadband energy harvester.
Bio:
Prof. Grzegorz Litak completed his M.Sc. degree in physics at University of Maria Curie Skłodowska (UMCS) in Lublin, in 1988. Later, working on the effect of disorder on correlated and exotic superconductors, he received his Ph.D (1994) and D.Sc (2002) degrees from the same University. After defending his Ph.D thesis he moved to in Lublin where he is presently working as a full professor. From 1994 he also started his research on nonlinear dynamics. He focused on bifurcation theory, chaotic dynamics and nonlinear time series analysis. Recently, he was also involved in research on mechanical and thermal energy harvesting, focusing on frequency broadband effects. G. Litak published about 400 papers including about 330 in the international journals.
沪公网安备 31011502006855号
