声波在弹性管和刚性管交替联结管内流体介质中传播的钳位效应

本文研究了声波在弹性管和刚性管交替联结管内静止流体介质中的传播特性,从理论和试验两方面指出了在交替联结管道内具有声滤波作用的钳位效应的存在,其声级减小与声波频率有关。这种钳位效应是由于声波在刚性管内与在弹性管内流体介质中传播速度不同所致。文中还获得了衡量钳位效应程度的声压透射系数和声强透射系数的计算公式,以及指出可利用钳位效应来降低某一段管内噪声的可能性。

The Pliers-seat Effect of Sound Wave Spreading in Liquid Within Joined Tube

This paper studies the spreading character of sound waves traveling within a tube filled with liquid that is the junction of an elastic tube and a rigid tube.Both he theory and the experiments show that there exists a pliers-seat effect in the filtering of sound waves within such a tube,that is,the sound pressure level decreases in frequency.This pliers-seat effect results from the difference of sound velocity in the rigid tube and the elastic tube when they are filled with liquid. Formulas of transmission coefficient of the sound pressure and the sound intensity representing the pliers-seat effect have been obtained,and the possibility of reducing noise in a tube by using pliers-seat effect is also suggested.