一种单自由度振动系统动态载荷识别方法

摘要

The spacecraft is in a complicated mechanical environment, and its external load can not be measured directly. So a mechanical load identification method is proposed for spacecraft during the flight phase. Based on the Duhamel’s integration, with the second order polynomial as the base function, the dynamic load identification mode for a single-degree-of-freedom vibration system is built. The simulation results show that this method has a high identification precision and the problem of error accumulation is solved. The method can provide theoretical bases and technological supports for the test validation and engineering applications.%航天器在飞行过程中经历了复杂的力学环境，但是目前又无法直接测量出这种复杂力学载荷函数。针对这一问题，提出了一种应用力学载荷识别方法确定航天器所经受力学载荷的新方法，针对单自由度振动系统模型，以二次多项式为基函数，推导建立了基于Duhamel积分的动态载荷识别模型。仿真分析结果表明，该方法具有很高的识别精度，且不存在误差积累问题。该方法为下一步试验验证和工程应用提供了理论基础和技术支撑。