声场中声能量与传递

当声波传播偏离平面波传播规律时，声场中存在无功声强，影响声能量的传递，有部分能量滞留在声场中。在近场，局部声源表面有时吸收声场中的能量，这成为声场中出现负声强的原因之一。

Acoustical Energy and Transfer in a Sound Field

If the propagation of sound wave diverges from the propagation regularity of the plane wave,the reactive sound intensity exists in the sound field,which has an effect on the acoustical energy transfer,and a part of the energy is kept in the sound field.In the near field,a local surface of sound source has an ability of absorbing energy.This becomes one reason of negative sound intensity in the sound field.