以电磁铁为作动器，提出了一种新型电磁式主动吸振器，并对其力特性进行了 研究。首先，建立了作动器的电磁力数学模型; 然后，基于作动器的电磁力数学模型， 建立了主动吸振器的运动学方程，并对其电磁力和驱动力特性进行了分析; 最后，考虑 到主动吸振器在实际工作中产生的驱动力与理想驱动力之间存在不可避免的偏差，对实 际驱动力与理想驱动力存在一定的幅值、相位和频率差时对主动吸振器减振效果的影响 进行了理论分析，并搭建了简支平板试验台，对理论分析结果进行了试验验证。结果表 明: 实际驱动力与理想驱动力的幅值、相位差越大，减振效果越差; 当实际驱动力与理 想驱动力存在频率差时，主动吸振器无减振效果。

A new electromagnetic active vibration absorber was desiggned by using an electromagnet as the actua- tor，and its force characteristics was studied． Firstly，the mathematical model for electromagnetic force of actuator was built． Secondly，the kinematical equation of the active vibration absorber was deduced based on the mathe- matical model，and the characteristics of electromagnetic force and driving force was analyzed． Finally，conside- ring the inevitable variance between the practical driving force and the ideal driving force of active vibration absor- ber，the influence of the variance in amplitude，phase and frequency on the performance of the active vibration ab- sorber was analyzed analytically． Experiment bench for a plate was set up，and the theoretical analysis has been verified by experiments． The results show that the greater the amplitude and phase variance between the practical driving force and the ideal driving force is，the poorer the damping effect is; when there is frequency variance，ac- tive vibration absorber has no damping effect．