【摘要】 结构动力响应作为模态参数识别的输入数据,对识别结果存在一定的影响。扩展特征系统实现算法(EERA)是一种多输入输出的结构模态参数识别的时域方法,相比于特征系统实现算法(ERA)应用范围可以扩展到任何随机响应,具有识别精度高、稳定性好等特点。该文主要对EERA算法,在分别采用加速度、速度和位移动力响应作为输入时,对两个自由度弹簧阻尼质量系统和实验室环境下6层框架结构识别的结果进行了比较分析,得出EERA对任何动力响应均适用,并且建议采用加速度动力响应信号识别高阶模态。更多还原

【Abstract】 The dynamic responses,as the input data of modal parameters identification,would affect the identification results whichever the identification method could be used.As one of the modal parameters identification with multi-input and multi-output in a time domain,the extended eigensystem realization algorithm(EERA) could be directly applied for an arbitrary random forced vibration system with the advantage of high accuracy,stable and so on.The paper identifies the modal parameters of two kinds of models,2-NDof spring-damping-mass system for numerical model and 6-story frame structure for experimental model,via EERA with the 3 different sets of input responses of acceleration,velocity and displacement.The conclusions show that EERA could apply to any dynamic response without any code change,and acceleration response should be used when higher modes need to be identified.更多还原