【摘要】 根据环境激励具有随机性以及线性系统在环境激励下各输出点响应之间的相关函数与系统的脉冲响应函数具有相同的数学表达式等特点 ,给出了在线模态参数识别的理论 ,并提出了仅根据环境激励响应识别模态参数的新方法 .该方法简单实用 ,不仅能在线识别参数 ,而且对单输入和多输入均适用 .数值算例表明 ,该方法不仅能识别稀疏模态 ,而且也能识别密集模态 ,是一个有效的在线模态参数识别方法且具有鲁棒性 .更多还原

【Abstract】 An on line parameter identification technique (OLPIT) was presented according to the ambient excitation characteristics and the response cross correlation function that is a sum of decaying sinusoids of the same form as the impulse response function of the original system. The theory of OLPIT was given and OLPIT is a new method of identification modal parameters from the response of engineering structures under ambient excitation. The method is a very powerful and applicable tool for the analysis of structures. The simulation demonstrates that the method is effective in identifying complex modes even with close frequencies and is robust to the measurement noise.更多还原