amplitude resonance

The subharmonic instability can be found in a wide extent of the frequencies and Reynolds numbers and the growth rates and amplification factors of amplitude are much higher than that of the primary wave. The secondary subharmonic resonance may be an intrinsic transition mechanism of compressible boundary layer.

二次亚谐波在很宽频率和雷诺数范围内不稳定，其增长率和幅值放大因子都远大于初始波，二次亚谐共振是可压缩边界层转捩的内在机制。

Damping wakes possible finite steady-state vibration amplitude at resonance.

在共振时,阻尼可能限制稳定振动的振幅.

If lower mode damping is increased in order to limit the resonance amplitude, the rattle threshold speed will increase.

增大低阶模态阻尼，能够增大拍击门槛转速。

Then theoretical resonance length, small end diameter, displacement node, magnification factor, shape factor and other parameters of the amplitude amplifier pole could be determined.

确定出其理论共振长度、小端直径、位移节点、放大系数、形状因数等参数。

It is found from experimental investigations on the distortion of ferromagnetic resonance curve and the broadening fo the resonance linewidth due to amplitude modulation that the relationship between apparent linewidth and true linewidth is in agreement with Wahlquist equation [ 1], when small modulation condition is satisfied.

本文通过调制幅度引起铁磁共振曲线畸变和使共振线宽增加的实验研究，发现满足小调制条件时，视在线宽和真实线宽的关系符合文献[1]所提出的方程式。