| Closely related with the practical problems in engineering,this dissertation deals with micro-positioning platform for ultra-precision turning machine in order to improve machining accuracy. Based on many data which have been collected, a kind of single degree of freedom micro-positioning system, which uses double parallel four-bar flexure hinges as the preload mechanism and be driven by a piezoelectric translator is developed. Based on the study, the structural parameters are optimized, and experimental tests have been carried out. The main achievements are summarized as follows.A kind of micro-positioning platform driven by piezoelectric translator, preloaded by flexure hinges is designed. With the aid of the finite element method and optimization design, the structural parameters of the flexure hinges are analyzed. The suggestion on optimizing the structural parameter is put forth.The static and dynamic characteristics of the double parallel four-bar flexure hinges have been analyzed through the finite element method, and the characteristics are obtained.Simplifying the micro-positioning platform into a single degree of freedom spring-damping system, the dynamic model has been established. The dynamic characteristics and transfer function of the system are analyzed.In order to eliminate the non-linearity and improve the accuracy of the output, some control methods are investigated.The static and dynamic characteristics of the micro-positioning platform are also studied by experimental method. The results of theoretical analysis, finite element method and experimental tests prove that the theory and method applied in design are right and efficient. |
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