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Compact electromagnetic vibration suppressor and energy harvester; an experimental study
Aref Afsharfard,Kyung Chun Kim,Hooman Zoka 국제구조공학회 2024 Smart Structures and Systems, An International Jou Vol.33 No.3
In this study, an electromagnetic dynamic vibration suppressor and energy harvester is designed and studied. In this system, a gear mechanism is used to convert the linear motion to continuous rotary motion. Governing equations of motion for the system are derived and validated using the experimental results. Effects of changing the main parameters of the presented system, such as mass ratio, stiffness ratio and gear ratio on the electro-mechanical behavior of system are investigated. Moreover, using so-called Weighted Cost Function, the optimum parameters of the system are obtained. Finally, it is shown that the presented electromagnetic dynamic vibration absorber not only can reduce the undesired vibration of the main system but also it can harvest acceptable electrical energy.
Novel modeling of circular piezoelectric devices as vibration suppresser and energy harvester
Ahmad Saadatinasab,Aref Afsharfard 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.5
In this paper, a simple model for circular piezoelectric energy harvester is theoretically and experimentally studied. For this reason, vibration behavior of a circular piezoelectric device, which simply called piezoelectric buzzer, is modeled as a changeable cross-section beam. A new quartic polynomial function is introduced to precisely describe the vibratory behavior of the circular piezoelectric device. The obtained electromechanical equations of motion are experimentally validated. As a case study, application of the presented circular piezoelectric device is studied when it is used in a galloping-based energy harvester. Finally, the optimized parameters of the presented energy harvester and vibration suppressor are presented and its efficiency is studied.