An electromagnetic torsion active vibration absorber based on the FxLMS algorithm

Abstract

Dynamics vibration absorbers are an effective solution to the problem of vibration. However, there are relatively few applications in low-frequency torsional vibration control. Therefore, for low-frequency torsional vibration, this paper proposes an electromagnetic torsional active vibration absorber, and establishes an active control system based on the filter-x least mean square (FxLMS) algorithm. First of all, the electromagnetic torsion actuator structure is designed with an electromagnetic-permanent magnetic hybrid structure, and the theoretical model of electromagnetic torque is established. Moreover, the influence of structural parameters on the linear stable interval of electromagnetic torque is analyzed, and the effective stroke range of electromagnetic torsion actuator is determined. Then, based on the FxLMS algorithm, the control system of the electromagnetic torsion active vibration absorber is established, and the theoretical model of the secondary channel transfer function is obtained. Furthermore, it is verified by simulation analysis, the results show that the electromagnetic torsional active vibration absorber can achieve good low-frequency torsional vibration absorption performance and is significantly better than without control under the excitation of harmonic torque and white noise torque. Finally, an experimental investigation is carried out on the electromagnetic torsion active vibration absorber based on the FxLMS algorithm to verify the feasibility and effectiveness of the electromagnetic torsion active vibration absorber.