一种改进模态参数识别方法在结构工程中的应用

摘要

提出了一种采用带有间断频率的经验模式分解(EMD)与自然激励法(NEXT)相结合的新的模态时域识别方法,并在理论上证明了该方法的正确性.数值模拟与工程实例识别结果表明,该方法能够准确识别出结构的模态频率和模态阻尼比.%A new data analyzing method which consists of mainly the empirical mode decomposition (EMD) with intermittency frequency and the developed natural excitation technique(NExT) is presented. The validity of the method has been proved theoretically. Finally, the results of simulation and engineering example suggest that this new method could exactly identify the structure vibration frequency and the mode damping ratio.