The variation of structural frequency before and after the damage is believed to be a most available and widely used modal parameter because of its easy testability and high measure precision.
由于结构频率测试容易测试并且有较高的测量精度，因此成为损伤识别中广泛应用的模态参数。
The variation of structural frequency before and after the damage is believed to be a most available and widely used modal parameter because of its easy testing and high measure precision.
由于结构频率容易测试并且有较高的测量精度，因此成为损伤识别中广泛应用的模态参数。
The result shows that this frequency measure system has the characteristics of the low cost, high speed, the equal precision and etc. It can be used widely in future.
结果表明：这种频率测量系统具有成本低、高速、等精度等特点，应用前景广阔。
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