三悬线式光学头力矩器等效刚度模型

Equivalent Stiffness Model Study of A 3-axis Optical Head Actuator

一阶共振频率是光学头力矩器的重要特性之一,研究的力矩器在聚焦方向、循迹方向和倾斜补偿方向上的固有频率分别为50.5 Hz,54.8 Hz和205.2 Hz。力矩器中支承部件悬线当作悬臂梁处理,利用材料力学和振动理论中梁挠度理论,将力矩器的受力转化为悬线受力,建立了力矩器的在聚焦运动、循迹运动和倾斜补偿运动三个方向的等效刚度模型,等效刚度模型计算结果与仿真结果、实验结果对比,误差均小于1%。

The first resonance frequency is one of the most important characteristics of optical head actuator, and the inherent frequency of studied actuator is 50. 5Hz, 54. 8Hz and 205. 2Hz in focus, track and tilt direction respectively. The hanging wires which bear the actuator＇s main weight can be regarded as ideal cantilevers, after transferring the force distributions of actuator to the force distributions on wires, the equivalent stiffness model has been set up with deflection theory of mechanics of materials and vibration theory in focus move, track move and tilt move respectively. Finally, the equivalent stiffness model results is less than 1% after compared with simulation results and experiments results.