These are infragravity waves, so called because they are sub-harmonics of the original gravity waves.
这就是亚重力波，之所以这样命名是因为它们是原始重力波的分谐波。
The measurement results and analyses shows that the sub-harmonics in, loudspeaker shell are caused by the interaction of vibration modes.
对扬声器的非线性分谐波的测量分析表明，扬声器薄壳分谐波的产生源于扬声器薄壳模态的相互作用。
The dynamical model of jump vibration is built, the nonlinear dynamical characteristic of jump vibration is studied and find the sub-harmonics vibration is main characteristic.
建立了振动压路机跳帧的动力学模型，研究了跳振时振动压路机的非线性动力学特性，选取次谐波共振为跳振的主要特征。
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