A vibration source and a medium are needed to form a mechanical wave.
机械波的形成需要振源和介质。
A monoaxial vibrating motor placed transversely on a sifter as a vibration source of a high speed sifter was developed in this paper.
提出将单轴振动电机横置于筛体上作为高速振动筛的振动源。
This paper presents a method of using self made vibration source and vibrometer to excitc surface waves (ripples) to produce interference.
介绍了用自制的振源、振子来激发表面波（涟波）产生干涉，从而测出液体的表面张力系数的方法。
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