Abstract
Energy dissipation of N wave compared with linear attenuation in a circular pipe is discussed. A single sound pulse of finite amplitude which is initially sinusoidal propagates into the pipe and its wave form is distorted by the nonlinear effects in addition to the linear absorption caused by the tube-wall effects. It is found in some cases that the total dissipation of energy included in whole wave shows lower attenuation than that of the small amplitude wave, despite its nonlinear distortion effect. It is concluded that this propagation behaviour appears for the waveform progressively distorted from a sinusoidal to an N wave, because the attenuation of energy is unaffected by the nonlinear dissipation before a shock front is formed.
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