空间微振动模拟器构型优化设计研究

Study of Configuration Optimization Design for Space Vibration Simulator

为提高空间隔振技术的有效性和可靠性,设计一种关于于Stewart并联平台的空间微振动模拟器用作地面试验的振源,并对机构理想构型的设计进行研究。首先,对机构进行数学建模并结合虚功原理和Newton-Euler欧拉公式,得到系统广义质量、刚度、阻尼以及各阶固有频率的数学解析式。然后,根据模拟器的振动频率范围,利用分离变量法对构型参数进行优化设计得到理想构型。为了验证构型下机构仿真振动的有效性和准确性,通过逆动力学解算出输入并将其赋予模型,得到机构的输出力曲线,分析结果表明正弦振动扰动力控制误差为1.58db,输出扰动力频率控制精度为2.85%,各项参数均满足空间微振动模拟器的技术指标要求。

To improve the effectiveness and reliability of the space vibration isolation technology, a space micro vibration simulator based on the Stewart platform is designed as the vibration source for ground test, and deep re- search of the configuration optimization is made. Firstly a mathematical system model is built according to the Newton - Euler dynamic approach and virtual work equation, and the formulations for the system mass matrix, stiffness ma- trix, damping matrix and the modes are obtained. Then the optimal structure is got by using the variable separation method with the consideration of the frequency range of the simulated vibration. To verify the effectiveness and accu- racy of the vibration simulation of the system in the optimal shape, the input force curves of the six legs are computed by the anti -dynamic modeling and then imported. The system output force curve is acquired and it shows that the control error of the sin disturbing force is 1.58db and that of the disturbing force frequency is 2. 85% , which meets the technical requirements.