When the exciting force was constant the average level of sound radiation produced by modal vibration has a linear relationship with the level of mode shapes.
得出，当激振点不变时，激振力级的变化与振动模态辐射的平均声压级成线性关系；
In the ambient vibration test, the dynamic characteristics of the bridge and the tension force of the cables under constant load were measured.
进行现场环境振动试验，测量了该桥的竖向、扭转动力特性，以及吊索恒载下的索力。
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