大转角快速反射镜柔性机构的优化设计与动态分析OA北大核心CSTPCD

This study presents the design of a flexible mechanism with a large deflection angle for piezoelectric-driven fast-reflecting mirrors,to address the common issue of small deflection range.First,a study was conducted on the correlation among the nested hierarchy,configuration,natural frequency,and amplification factor of the flexible mechanism.Accordingly,a preliminary plan was developed for the design of a three-stage hybrid configuration.The mechanism was discretized into flexible hinges,rigid bodies,and concentrated masses as basic units.Subsequently,a general dynamic stiffness model was constructed for the flexible mechanism using the matrix displacement method.This model establishes a mapping relationship between the structural parameters of the flexible mechanism and the deflection angle of the fast-reflecting mirror.On this basis,a modal analysis of the flexible mechanism was performed,whereby the key dimensional parameters of the fast-reflecting mirror's flexible mechanism were optimized.Compared to similar research conducted domestically and internationally,this configuration achieves a mechanical deflection angle greater than 100 mrad by ensuring miniaturization and a higher first-order natural frequency.