基于柔性铰链的微位移放大机构设计

Design of micro-displacement amplifier based on flexure hinges

为了对柔性铰链进行优化设计,定义了一个新的参数并用它来讨论5种常见的柔性铰链—直梁型柔性铰链、圆角直梁型柔性铰链、椭圆型柔性铰链、抛物线型柔性铰链和双曲线型柔性铰链。首先建立了一个柔性铰链的有限元模型并用理论分析验证它的正确性。由于刚度是影响柔性铰链性能的最重要的参数,定义了一个参数λ——柔性铰链凹口处长与宽的比值。然后通过有限元分析得出5种柔性铰链刚度比值ε的曲线,并且基于此比值设计了一个压电致动器的微位移放大机构。本文的设计方法以及刚度比ε有助于我们设计这一类型的微位移放大机构。

To optimize the design of flexure hinges, a new parameter is defined to discuss the stiffness characterization of five general flexure hinges, which are leaf type flexure hinge, corner-filled flexure hinge, elliptical flexure hinge, parabolic flexure hinge and hyperbolic flexure hinge. First, a finite element model of flexure hinges is developed and confirmed by the theoretical formulation data. Because the stiffness is the most important parameters to access the performance of flexure hinges, we find a parameter λ, which is defined as the ratio of the length and width of the notch. Then the stiffness ratio ε of five general flexure hinges is obtained by finite element analysis. Based on this ratio, a micro-displacement amplifier is designed which used for piezoelectric actuator. This method and the stiffness ratio are very helpful to design the micro-displacement amplifier.