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DINAME 2017
XVII International Symposium on Dynamic Problems of Mechanics
EFFECT OF MISTUNING ON THE HARVESTED ENERGY FROM A NONLINEAR SYSTEM WITH WEAK COUPLING
Submission Author:
Maryam Ghandchi Tehrani , UK , United Kingdom
Co-Authors:
Maryam Ghandchi Tehrani, Najib Kacem, NOUREDDINE BOUHADDI
Presenter: Maryam Ghandchi Tehrani
doi://10.26678/ABCM.DINAME2017.DIN17-0189
Abstract
In this paper, the potential benefit of mistuning on the harvested energy from a nonlinear system is investigated. Previously, it has been demonstrated that the mistuning of the linear periodic weakly coupled system can increase the harvested power significantly [1,2]. In this paper, the work is extended to a nonlinear system with weak linear coupling as shown in Figure 1. The nonlinearities taken into account include a Duffing nonlinear spring due to an electromagnetic set-up and a cubic electrical damping, which is used in the electrical circuit as nonlinear resistive load to harvest energy. A two degree-of-freedom (dof) spring-mass-damper system with grounded nonlinear springs is considered. The mistuning is achieved by a slight variation of one of the masses. An electromagnetic energy harvester is used to harvest energy from the motion of the mistuned mass. The response and the harvested power of the mistuned system is obtained using harmonic balance method as a function of the mistuning parameter. The effects of the mistuning, damping and excitation level on the harvested power are investigated. The performance (harvested power) of the linear and nonlinear electrical damper is also compared for different values of mistuning and excitation levels. The system can easily be generalized to n DOF to represent a quasi-periodic structure. References. [1] P.V. Malaji and S.F. Ali, Energy Harvesting from Near Periodic StructuresMechanisms and Machine Science, 23, 2015, pp.411-419. [2] M. Ghandchi Tehrani, N. Kacem and N. Bouhaddi, Effect of Multiple Mistuning in Vibration Energy Harvesting from Weakly Coupled Periodic Structures, POWERMEMS2017, submitted.
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