Propagation of finite amplitude wave through circular pipe with discontinuity cross sections

概要

論文の詳細を見る
The propagation of the finite amplitude wave through the pipe system which is made of the infinite long pipe with two discontinuity cross sections is dealt with in this paper. At first, the measurement of the nonlinear response of the system is made by the use of the impulsive incident wave similar to a period of sinusoidal waveform, and then the simulation of the transmitted wave through the system is performed under some assumptions to compare the experimental results. In the simulation, the linear theory is used in the operation of the reflection and the transmission at the boundary, and the nonlinear theory is used in the operation of the propagation through the pipe. The simulation results agreed with the observed results well. On the other hand, considerable disagreement between simulated results and the linear theory are found around a certain frequency given by dip in the spectrum, and so it may be concluded that the nonlinear response of the system is determined by the waveform distortion due to the finite amplitude effect with propagation through the pipe, and therefore the response depend upon not only the amplitude but also the pulse-length of the incident wave.
社団法人日本音響学会の論文