Harmonic distortion arises from the nonlinear vibrations of mechanical device of seismic source and the coupling between the vibrator and the ground.
由于震源的机械装置和振动装置的非线性振动以及振板与大地的耦合等问题，在震源向地下输入能量的同时，也产生了谐波畸变。
An overview of the research conducted in the area of linear and nonlinear vibrations in the turning-point frequency range of loudspeakers and revolution shells is given in chapter 1.
第1章回顾了扬声器和旋转薄壳在转点频段的线性和非线性振动，发现旋转薄壳转点问题中尚有若干问题有待进一步研究。
The spectrum curves determined for linearly elastic systems still have significance for nonlinear hysteretic vibrations.
线性弹性系统确定的谱曲线对非线性滞回振动仍然是有意义的。
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