三维悬线式力矩器的等效刚度模型

Equivalent rigidity model for three-axis suspended actuators

三维悬线式力矩器是高密度光学头系统中的核心组件,其等效平动刚度和转动刚度直接决定着光学头克服和补偿系统误差的能力。该文根据三维悬线式力矩器的悬浮支撑模型,依据外力作用下悬线的变形协调关系,利用卡氏最小功原理建立了三维悬线式力矩器在各个有效运动方向上的等效刚度模型。进而由等效刚度可计算出三维悬线式力矩器的固有频率。最后利用Doppler激光测振仪对实验样品进行固有频率测试,实验结果与理论结果相比,最大误差不超过8.5%。该等效刚度模型对力矩器可动部的设计具有重要的理论指导作用。

In three-axis suspended actuators, the core component in high-density optical pickups, the equivalent translational and rotational rigidities determine the sensors ability to overcome and compensate for system errors. A suspended poling model based on the Castigliano theorem was used to predict the rigidity in each direction based on the deformation of the wires. Then, the natural frequency in each direction was calculated using an equivalent rigidity. Finally, several actuator samples were tested on a Doppler vibrometer to get the natural frequency in each direction. The maximum error between the theoretical and experimental results is less than 8. 5%. Thus the equivalent rigidity model can be used for improved actuator designs of high density optical pickups.