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

An inertia electromagnetic actuator capable of adjusting natural frequency is designed in this paper. There are two procedures in the design of electromagnetic actuator: magnetic circuit design and stiffness conditioning design. ANSOFT software is used to simulate the magnetic circuit during the magnetic circuit design and optimize the design of the actuator. In order to adjust the natural frequency, the actuator spring is designed adjustable to meet the different need of the system stiffness. Using the X-LMS algorithm,a series of active vibration control test has been done on the test bench. Experiment results show that if fixing the adjustable spring, the actuator can be used as a normal actuator, and it can only get the best control effect at one natural frequency. But when using the adjustable spring, it can get the best control effect at four natural frequency. At different control frequency, that actuator can improve the control effect about 0.4~6.9dB.