Abstract
Electromagnetic transducers (ETs) has been getting attention to harvest energy from low-frequency vibration of structures. To improve the ET, the tuned inertial mass electromagnetic transducer (TIMET) has been proposed by the authors. The TIMET consists of a ball screw mechanism, rotational mass, turning spring, and permanent magnet synchronous motor (PMSM) and its energy absorption capability can be increased by taking advantage of the resonance effect of the rotational mass due to the tuning spring. However, the TIMET cannot give the high performance under vibration with unexpected frequencies because of the mechanism. To address this issue, this paper proposes the electromagnetic transducer with a variable tuned inerter which can adapt to the frequency change of external disturbances. This paper introduces the variable inerter system and presents the energy harvesting performance obtained from the sine sweep wave testing.
