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DINAME2019
DINAME2019
Isolae present in electromechanical systems with nonlinearities: a tradeoff between risk and usefulness
Submission Author:
Willian Minnemann Kuhnert , SP
Co-Authors:
Willian Minnemann Kuhnert, Marcos Silveira, Andrea Cammarano, Paulo José Paupitz Gonçalves
Presenter: Willian Minnemann Kuhnert
doi://10.26678/ABCM.DINAME2019.DIN2019-0133
Abstract
This paper presents some highlights on the complex dynamics of electromechanical (EM) systems with nonlinear characteristics. In particular, it focuses on isolated branches in the frequency response, also known as ``isolae''. EM systems are used in a wide range of applications including mechanical isolation, actuation and energy harvesting. Nonlinearities that naturally occur in EM systems can lead to unexpected and consequently dangerous responses if not adequately taken into account. Knowing the full dynamics of these systems reduces the risk of failure in operation, but also allow for a smarter design, where the nonlinearities are not feared but used to improve the performance of the EM system. For example, in energy harvesting, nonlinearities can be used to broaden the frequency band of operation. In this study the following nonlinear parameters are considered: stiffness, inductance and capacitance. The study was conducted using direct integration approaches and numerical continuation together with analytical methods such as harmonic balance: the frequency responses were computed and the nonlinear parameters that can result in isolae were identified. The results show that EM systems with nonlinear parameters present a variety of bifurcations and that some of these can be advantageous for vibration isolation and energy harvesting.
Keywords
Electromechanical, nonlinear dynamics, energy harvesting, Isolae, Isolation
