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为了能有效地减小换能器的体积,实现同位控制及对换能器工作频率的自动调节,提高换能器的工作效率,提出了超磁致伸缩换能器的谐振频率自动跟踪方法。根据超磁致伸缩材料压磁方程,建立了超磁致伸缩换能器速度、阻抗及所受外力的自感知模型;分析了利用感知阻抗自动搜索谐振频率的工作原理,在无需安装检测谐振频率传感器的条件下,实现换能器谐振工作点的自感知,并能方便、快速地自动跟踪系统的谐振频率。在研制的实验装置上,比较分析了扫频方式和搜索感知阻抗方式跟踪谐振频率的一致性,验证了换能器谐振频率自动跟踪方法的可行性与正确性。
In order to effectively reduce the volume of the transducer, realize the homologous control and automatically adjust the working frequency of the transducer and improve the working efficiency of the transducer, a method of automatically tracking the resonant frequency of the giant magnetostrictive transducer is proposed. According to the magnetostrictive equation of the giant magnetostrictive material, the self-sensing model of the velocity, impedance and external force of the giant magnetostrictive transducer is established. The working principle of using the sensing impedance to search the resonant frequency automatically is analyzed. Sensor conditions, the realization of transducer resonance point of self-sensing, and can easily and quickly automatically track the resonant frequency of the system. On the experimental device, the consistency between the tracking frequency and the frequency of the search-perceptual impedance is analyzed and compared. The feasibility and correctness of the automatic tracking method for the resonant frequency of the transducer are verified.