一种自动识别结构模态参数的随机子空间方法

摘要

Real-time online monitoring of the structure put forward the demand for the automatic identification of the structural modal parameters.The current methods of the structural modal parameter identification require manual intervention,in order to realize real-time monitoring of the structure,this article attempts to develop an automatic structural modal parameters identification method.Stochastic subspace method only needs to determine one parameter,which is "system order".This paper proposes a method for automatic identification system order based on the frequency stability and vibration mode stability,based on those,we established an automatic identification method for structural modal parameters.Through identification two bridge examples,the reliability and applicability of the method was verified.%对结构进行实时在线监测的要求提出了对结构模态参数进行自动识别的需求.目前发展的结构模态参数识别方法均需要人工干预,为实现无人值守的结构实时监测目标,试图发展一种结构模态参数自动识别方法.随机子空间法唯一需要确定的参数是“系统的阶次”,因此,提出了一种基于频率稳定性和振型稳定性自动判别系统阶次的方法,基于此,建立了基于随机子空间法的模态参数自动识别方法;通过两个桥梁算例,对该方法的适用性和鲁棒性进行了验证.