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本文讨论利用振动系统的随机响应和自由响应信号识别系统模态参数问题。文中提出了将系统的固有频率与阻尼比同振型先后予以识别的方法。提出了一种在实数域内识别模态参数中幅值与相位的新方法,并得到一个简化算式。模拟计算和现场试验表明,本法是行之有效的。最后对有关模型定阶及虚假模态的剔除等问题进行了探讨。
This article discusses the use of vibrational system response and free response signal to identify the modal parameters of the system. In this paper, the natural frequency and damping ratio of the system have been identified with the vibration mode has been identified. A new method of identifying amplitude and phase in modal parameters in real number domain is proposed and a simplified formula is obtained. Simulation and field tests show that this method is effective. Finally, some problems such as the order of model and the elimination of false modal are discussed.