Processing the response signals by using the random decrement technique, a unique corresponding to each mode is obtained, which represents a free vibration response of the structure.
应用随机减量技术对响应信息进行处理，相应于结构的每一振型可得到一条独特的随机衰减曲线，该曲线代表结构自由振动响应。
As an example, the frequency and its vibration mode of a rectangular plate with four edges free have been solved.
以四边自由矩形板为例求解了板的频率及其振型。
To check up the IP's vibration property, the IP's constrained-free mode is calculated referring to the modal testing requirement of the IP.
为检验仪表板总成的振动特性，参考仪表板总成的模态试验要求，计算仪表板总成的约束-自由模态；
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