有限振幅声波非线性传播畸变消除的研究

在高声强情况下建立一个无畸变（或低畸变）的声场是非线性声学的一个颇有兴趣的问题。本文讨论了频率分别为f₁,f₂和f₃三列声波的非线性相互作用,其中f₁为有限报幅声波的频率,而f₂=2f₁,f₃=3f₁。基于Fenlon关于多频率有限振幅声波传播的理论,作者指出,如果适当控制频率为f₂及f₃声波的初始位相和振幅,就有可能在某些接收点上抑制有限振幅声波的二次及三次谐波,从而使其传播畸变有极明显的降低。

STUDY ON REDUCTION OF NONLINEAR DISTORTION OF FINITE AMPLITUDE SOUND WAVE

The production of an intense sound field with nondistortion （or low distortion） is an interesting problem in nonlinear acoustics. In this article, nonlinear interaction process between three sound waves with frequencies f₁,f₂ and f₃ respectively has been discussed. Let f₁ is frequency of the finite amplitude wave and f₂=2f₁,f₃=3f₁. On the basis of Penlon's theory concerning the propagation of multiple frequency finite amplitude wave the authors have pointed out that by controlling the original phases and amplitudes of the two waves with frequencies f₂ and f₃ respectively, it is possible to cancel out the second and third harmonics of the finite amplitude wave at some receiving points, which shows that the progressive nonlinear distortion is obviously reduced.