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小物体在振动时一般不会产生高的噪声级,这是因为接触物体面处于运动状态的空气面积不大,振动不能有效地转化为声能.然而,如果在振动物体的一端连上一块面积较大的板块,由于受激空气的面积变大,物体振动能量就能较有效地转变为空气声,产生高噪声级.音叉若不与“音板”相连,仅仅产生微弱的声音.暖气装置的循环泵可引起管子的振动,这种振动引起的噪声很小,但一旦和散热器相连,那么在散热的同时,噪声也会一起辐射出来.
Small objects generally do not produce high levels of noise when vibrating because the area of the air in contact with the object is not large and vibrations can not be efficiently converted into sound energy. However, if one area of the vibrating object is connected to an area In larger sections, as the area of the stimulated air becomes larger, the vibrational energy of the object can be more efficiently converted into airborne sound resulting in a higher noise level. The tuning fork, if not connected to the “sound board”, produces only a faint sound. Of the circulating pump can cause tube vibration, the noise caused by this vibration is very small, but once connected with the radiator, then the heat at the same time, the noise will be radiated together.