The component having the lowest frequency in a complex vibration (fundamental frequency or first harmonic).

复杂振动中频率最低的成分(基频或一次谐波)。

youdao

The experiment research on laser micro-Doppler effect for detecting complex vibration of moving target is developed.

建立了激光微多普勒效应探测系统，开展了激光微多普勒效应探测运动目标复合振动的实验研究。

youdao

The experimental results demonstrate that this way is extremely reliable for measuring complex vibration type of blade.

试验结果表明这种方法用于测量叶片的复杂振型是十分可靠的。

youdao

"It's quieter,it has less vibration, its inherently less complex which drives down costs, and it's easier to operate."

VOA: standard.2010.08.11