The stiffness of ems is controllable , and taking it as the kernel , an emdva which natural frequency can adjust according to the frequency of the excitation force is designed . the emdva can adjust its natural frequency to keep up with the frequency of the excitation force acted on the main mass , reach in the almost perfect status of dynamic harmonization absorption and obtain satisfactory absorption effect 该电磁弹簧的刚度值是可控的，以此电磁弹簧为核心，设计了一种固有频率可实时调整的电磁式动力吸振器，该动力吸振器能够调节其固有频率与作用在主质量上的激励力的频率保持一致，从而达到接近理想的动力调谐吸振状态，获得满意的吸振效果。
