微位移放大模块的刚度分析

Stiffness Analysis of Micro-Driving Displacement Amplifier Module

刚度的优劣很大程度上影响着全柔性微动机构末端执行器的定位精度及动态特性,因而建立全柔性微动机构较为简便的、精确的刚度模型变得尤为重要。以全柔性微位移放大模块为例,采用伪刚体法并依据构件之间的弹性变形关系得到模块机构的运动方程,利用全柔性微位移放大模块在运动过程中能量的转化关系,结合功能原理建立机构的刚度模型,并通过算例对其进行ANSYS有限元仿真分析。结果表明理论计算值与仿真结果误差在5%之内,具有较高精度。

Stiffness greatly affects the actuator positioning accuracy and dynamic characteristic of compliant mechanism,so how to establish the more convenient and accurate stiffness model for flexible mechanism is a key problem.To build a pseadorigid-body of micro-driving displacement amplifier module targeting,the motion equation can be built based on the elastic deformation relationship of the components.Afterwards,stiffness model could be set up by taking advantage of energy conversion relationship and function principle.For this example,FEA alsois used to verify the theory.It shows that deviation between theoretical calculation and simulation result is below 5％,which means a relative higher precision of the method.