基于基函数分解的连续变速颤振边界预测方法

摘要

针对连续变速颤振试验实测信号的特点及在线处理需求，提出一种基于基函数展开的时变参数建模方法。通过对结构响应信号建模和稳定性判据的趋势分析，得到颤振边界随时间变化的预测曲线。依据颤振试验机理，采用白噪声激励多模态耦合系统的方式生成了相应的仿真信号，进而在不同信噪比下验证了方法的数值性能。最后通过气弹模型低速风洞试验进一步检验本文方法的工程实用性。%According to the characteristics and online processing requirements of the actual measuring signal in flutter test with progression variable speed (FTPVS),a time-varying parameter modeling algorithm based on basis function expansion is pre-sented in this paper. The prediction curves of flutter boundary versus time variation were obtained on the basis of modeling of structural response signal and trend analysis of the stability criterion. According to the mechanism of flutter test,the correspon-ding simulation signal is generated with the mode that the white noise stimulates the multi-modal coupling system. The numerical performance of the method was verified at different SNRs. The practical applicability of the method was checked in aeroelastic model wind-tunnel test.