压电陶瓷驱动的精密微操作平台特性与优化

发布时间：2018-10-19 09:14

【摘要】：设计一种结构紧凑、具有大运动空间和响应快的微操作平台,并对其静态和动态特性进行分析和优化.利用杠杆机构和连杆机构设计一种能实现两级放大的微操作平台,结构对称地设计在同一平面,并采用导向机构实现精确的导向运动.利用功能原理,采用伪刚体方法建立反映平台的静态和动态特性封闭形式的理论模型.由理论模型与有限元分析的结果比较分析可知,两者所得的结果误差范围为6.0%~7.2%,说明所推导模型的正确性.基于理论模型分析构型参数和柔性铰链尺寸参数对放大倍数、输出刚度、应力和固有频率的影响.结果表明,结构参数变化对输出刚度与固有频率的影响是矛盾的,对放大倍数和应力的影响也相互矛盾,需要通过优化结构参数以综合平衡其性能指标.提出一种以综合平衡平台的静态和动态特性为目标,并考虑应力、放大倍数和几何尺寸为约束的优化模型.结果表明优化后的固有频率和放大倍数比优化前均提高,而输出刚度降低,说明优化后的平台性能更好.
[Abstract]:A compact microoperation platform with large motion space and fast response was designed and its static and dynamic characteristics were analyzed and optimized. Using lever mechanism and connecting rod mechanism to design a micro-operation platform which can realize two-stage amplification. The structure is symmetrically designed in the same plane, and the guiding mechanism is used to realize the accurate steering motion. Based on the functional principle, a theoretical model reflecting the closed form of the static and dynamic characteristics of the platform is established by using the pseudo-rigid body method. By comparing the results of the theoretical model and the finite element analysis, it can be seen that the error range of the two results is 6.0 and 7.2, which shows the correctness of the derived model. Based on the theoretical model, the effects of configuration parameters and flexure hinge dimension parameters on magnification, output stiffness, stress and natural frequency are analyzed. The results show that the influence of structural parameters on the output stiffness and natural frequency is contradictory, and the effects on magnification and stress are also contradictory. It is necessary to optimize the structural parameters to balance the performance index comprehensively. This paper presents an optimization model which takes the static and dynamic characteristics of the integrated balance platform as its objective and takes into account the stress, magnification and geometric size constraints. The results show that the natural frequency and magnification of the optimized platform are higher than those before the optimization, but the output stiffness is lower, which indicates that the optimized platform has better performance.
【作者单位】：江西理工大学机电工程学院;
【基金】：国家自然科学基金资助项目(51265016)
【分类号】：TH703;TH112

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