线性时变结构模态参数时域辨识方法的研究进展

Research Progress on Time-domain Modal Parameter Estimation Methods for Linear Time-varying Structures

随着工程领域的不断拓展,越来越多具有显著时变特性的工程结构进入应用,时变结构动力学问题日渐凸显。从反问题的角度出发,介绍了时变结构动力学问题的研究背景与时变结构模态参数辨识的意义。在对时变结构模态参数辨识方法进行分类的基础上,给出了从参数化时域辨识模型中提取“时间冻结”模态参数的过程。系统全面地总结了时变结构模态参数时域辨识方法的研究进展,归纳了现阶段可用于辨识方法验证的实验系统,指出了该领域目前存在的一些问题以及今后需要进一步研究的主要方向。

With the development of engineering applications, more and more time-varying structures are being used and their intrinsic time-varying characteristics are increasingly inevitable, which brings us many problems on time-varying structural dynamics. The research background of time-varying structural dynamics and the motivation of modal parameter estimation for time-varying structures are first introduced from the standpoint of inverse problems. The modal parameter estimation methods for linear time-varying structures are classified, and the procedures to obtain “frozen-time” modal parameters from parametric time-domain identified models are subsequently presented. By investigating state-of-the-art of time-domain modal parameter estimation methods for time-varying structures and the existing experimental verification systems, major issues and future research directions in this area are finally discussed.