随机子空间法的模态识别正逐渐成为国内外结构损伤识别研究的一大热点。随机子空间识别法是一般基于环境振动信号,结合系统识别、线性代数和统计学的理论建立随机状态空间模型,进行模态参数识别。通过一个三跨连续梁为算例,验证了随机子空间法模态参数识别的可行性。 Stochastic subspace method modal recognition is gradually becoming a hot topic in structural damage identification research at home and abroad. The stochastic subspace identification method is based on the environment vibration signals. Combining with system identification, linear algebra and statistics theory, a stochastic state space model is established to identify modal parameters. A three-span continuous beam is taken as an example to verify the feasibility of modal parameter identification in stochastic subspace method.