尺蠖驱动器箝位机构的优化设计

箝位机构的性能直接影响尺蠖驱动器的性能,为满足尺蠖驱动器箝位机构输出力大、响应速度快和结构紧凑的工作要求,设计了单切口柔性铰链桥式箝位机构.该柔性机构的设计必须综合考虑机构的静动态特性,为此,建立了该机构的理论模型,通过刚度和固有频率的试验测试以及有限元分析,发现结构紧凑的小尺寸桥式柔性机构的理论模型误差较大,很难建立简单精确的理论模型.因此,利用有限元法研究了该柔性机构各几何参数对其静动态特性的影响,并通过改变该柔性机构的几何参数,实现对该柔性机构的静动态特性进行优化,以达到设计要求.结果表明它是一种简单有效的桥式耦合柔性机构的优化设计方法.

Optimum Design of Clamp Device for Inchworm Actuator

The clamp device is very important for inchworm actuator and its static and dynamic characteristics must be considered in design. In order to satisfy the demand for high output force,fast response and compact structure in inchworm actuators,the bridge-type eight-bar clamp mechanism with singlenotch flexure hinges was designed. The theoretical model that characterizes this mechanism was proposed. The experimental results and finite element analysis of the stiffness and natural frequency show that the analytical model has large error for small dimension structure and it is difficult to establish the simple and accurate analytical model. Thus,finite element method was used to study the influence of geometrical dimensions of this compliant mechanism on the static and dynamic characteristics of this mechanism. By changing the geometrical dimensions of this compliant mechanism,the static and dynamic characteristics of the compliant mechanism can be optimized and the corresponding design requirements can be met. The results show that it is a simple and effective optimal design method for bridge-type coupling flexible structures.