一类非线性系统载荷识别的组合迭代法

Combined Iteration Method of Load Identification for Complicated Nonlinear Space Structure

针对一类非线性系统提出了一种新的载荷识别方法,组合迭代法。该方法通过有限元方法和主动控制方法组合迭代来实现一类非线性系统的载荷识别。首先将非线性系统的有限元模型模态缩减成简化模型,由简化模型组成主动控制的被控对象;然后在选定的控制律下,设计控制调节器,使该系统监测点的响应功率谱密度达到预定谱,从而得到系统激励,即被识别的载荷;最后由非线性有限元响应验证载荷的合理性。对圆锥壳-包带组合系统载荷识别的数值研究表明了组合迭代法的有效性。该方法为导弹、宇宙飞船、航天飞机、火箭等航天航空结构振动试验的载荷识别提供指导作用,将促进航天航空事业的发展。

A combined iteration method for load identification is proposed to analyze the nonlinear dynamical system by joining finite element method with active control method. The finite element models of nonlinear dynamical systems are firstly simplified to construct the controlled plant. Then under the selected control law, the controller is designed to produce the system excitation, namely the identified load, and the validity of the load is then finally checked via the response of the nonlinear finite element model. The numerical example demonstrates the effectiveness of combined iteration method for a connected conical shell betting system.