forced vibration test

The first ten natural frequencies, damping ratios and mode shapes of the dam were measured through steady forced vibration test using multiple vibrators.

用多台起振机进行稳态强迫振动试验，测定了该坝前十阶自振频率、阻尼和振型。

Compared with forced vibration tests, the ambient vibration test is more convenient and it has enough accuracy for the small amplitude response characteristics.

与强迫振动试验相比，环境振动试验比较简单、方便，所确定出的小振幅水平下的木塔结构动力特性具有足够的精度。

Forced surge test may cause over vibration and damage to the compressor rotor during the compressor characteristics test.

压气机特性试验中逼喘是必须进行的，但它常常造成压气机转子振动过大，并对压气机转子造成一定的损伤。