free-response method 自由反应法
At last, ITD method based on free acceleration response is used to identify mode parameters, frequencies and modal.
最后利用基于加速度响应的ITD法识别结构的模态参数：频率和振型等。
Structural free vibration characterization and seismic response were calculated by means of beam-plate linear mathematical model of finite element method.
采用梁、板线性有限元数学模型计算了结构自振特性和地震响应。
A new method of estimating characteristic parameters for continuous spectrum of response signal of damped free vibration is presented in this paper.
针对自由衰减振动信号的连续谱，提出了一种估计特征参数的方法。
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