Design of natural frequency adjustable electromagnetic actuator and active vibration control test

Abstract

An important issue in inertia electromagnetic actuator is that the best performance of device is limited to a very narrow bandwidth around the natural frequency. In order to overcome this issue of the conventional inertia electromagnetic actuator, an inertia electromagnetic actuator capable of adjusting the natural frequency is introduced. This paper presents theoretical investigation, design method, and experimental tests of the natural frequency adjustable electromagnetic actuator. The optimal design scheme is obtained by using ANSOFT software and experimental tests are conducted to examine the practical property of natural frequency adjustable electromagnetic actuator. Following the results obtained by property experiments, a series of active vibration control tests are carried out and experimentally verified that although the measured natural frequencies at different positions cannot satisfy the theoretical values perfectly, natural frequency adjustable electromagnetic actuator still works very well at test frequencies and reduces the vibration from 18.3 dB to 11.3 dB at frequency of 26.25 Hz.