Optimal design and experimentation of a low-parasitic performance-balanced compliant guide platform
Inspired by the movement process and symmetrical structure of the hind limbs of frogs. A com-pliant tool guide platform that combines long stroke and high working frequency was proposed. The prob-lems of short working stroke of the direct drive type and low working frequency of the amplified type in the tool guiding platform were solved. First of all,a preliminary model of the compliant guide platform was proposed. The lengths of important rods were determined. In the second place,multi-objective optimiza-tion design was carried out on the preliminary model using finite element analysis. And the entropy weight method and the distance between superior and inferior solutions (TOPSIS) were used to rank the scores. On this basis,the structure was further optimized for the multi-operational topology using finite element analysis. In the end,the test prototype was machined for experimental testing. The finite element analysis and experimental results show that the amplification ratio of the guide platform is 4.67. And the maximum stroke can reach about 90 μm. The first-order natural frequency is 1765 Hz. The results of experimental tests on amplification ratio and natural frequency indicate that the proposed tool guide platform is capable of achieving long stroke and high frequency motion. And the X-axis parasitic error is 0.0022％. This can be seen as the presence of low parasitic displacements in the guide platform. At the same time,the resolution of the guide platform can reach the sub-micron level. And the trajectory tracking error is about 2％. Com-bining the simulation and experimental test results,the proposed compliant tool guide platform can achieve precision guided motion.
compliant mechanismpiezoelectric actuationlong strokefinite element designparasitic displacement
万方数据
维普
