管内平面波の減衰定数 : 減衰伝搬を伴う消音系の音響特性第1報

概要

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The sound pressure distribution of standing waves and the attenuation characteristics of plane waves in a straight tube with a solid end are derived as a function of attenuation constant δ, using the fundamental equation which holds for plane waves propagating in a tube with frictional dissipation. Calculated results of the acoustic characteristics are given as a function of the non-dimensional attenuation coefficient η, which is fixed by the attenuation constant δ times length of tube l. The attenuation constant δ are measured by using these acoustic characteristics of plane waves in a straight tube with frictional dissipation. The experimental results of attenuation constants δ regress to the approximate equation, which is derived from a fundamental equation. The calculated values of attenuation constant δ by regression formula are compared with the experimental results, and they are found to be in good agreement. From these results, the following facts are confirmed that the attenuation constant δ is given as a function of a sound wave length and Reynolds number which is fixed by the inner diameter of a tube, kinematic viscosity and the sound velocity, and that the attenuation constant δ can not be negligible for the acoustic characteristics of resonance frequency ranges in a tube system.
社団法人日本音響学会の論文
1979-04-01