一种单自由度柔顺铰链的优化设计

An optimized design for a single-degree-of-freedom compliant hinge

柔性机构通过减少非柔性机构的零件数及装配环节,提高了机构的可靠性、精度及寿命等。在设计一种柔顺机构时,确定其尺寸参数从而实现最优的工作状态是十分重要的。本文应用了伪静态方法建立一种柔顺铰链的静动力学模型,以机构的刚度与固有频率为目标,通过改变机构的几何尺寸,得到了两种改进的模型。这两种模型分别适用于不同的工作模式,大范围运动与高速往复运动。本文利用有限元分析验证了两种理论模型的正确性。

Flexible mechanism improves the reliability, precision and life of the mechanism by reducing the number of parts and assembly links of non flexible mechanism. When designing a compliant mechanism, it is very important to determine its size parameters so as to achieve the optimal working state. In this paper,the pseudo static method is used to establish a static and dynamic model of compliant hinge. Two improved models are obtained by changing the geometric size of the mechanism, aiming at the stiffness and natural frequency of the mechanism. These two models are suitable for different working modes, large-scale motion and high-speed reciprocating motion. The correctness of the two theoretical models is verified by finite element analysis.