振动系统工作在谐振频率处则其工作效率最高，但由于受到负载、温度等因素的影响，其谐振频率往往会发生漂移，为了实现对振动系统工作频率的自动调节，提高系统的工作效率，提出采用搜索振动系统速度阻抗的方法，在无需安装检测谐振频率传感器的条件下，实现振动系统谐振工作点的自感知，并能快速、方便地自动跟踪系统的谐振频率。设计了超磁致伸缩振动器，并给出了振动器机械阻抗的表达式；在分析超磁致伸缩材料磁-机耦合关系的基础上，建立了超磁致伸缩振动系统的速度、阻抗及所受外力的自感知模型；在研制的实验系统上，验证了振动系统谐振频率自感知方法的可行性与正确性。

Work efficiency of vibration system is tiptop while working in resonance frequency, but its resonance frequency occur excursion when affected by load,temperature and other factors. The method of resonance frequency self-sensing and automatic following in convenience and speediness by searching velocity impedance are presented, to self-regulate working frequency and improve working efficiency of vibration system, without fixing sensor for inspecting resonance frequency. Giant magnetostrictive vibrator is designed. Mechanical impedance expression of vibrator is given. Self-sensing models of velocity, impedance and effected force for giant magnetostrictive vibrator are deduced based on analysis of piezomagnetic coupling relation of giant magnetostrictive material. The result of vibration experiment system manifested that the calculation approach of self-sensing resonance frequency is feasible and proper.