有限振幅N波と連続鋸歯状波のエネルギー消散の比較

概要

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A theoretical calculation is made on nonlinear attenuation of energy including in an N waveform under comparison with energy dissipation of repeated sawtooth waves. It is found that the attenuation coefficient of energy of N wave estimated is only a quarter of the coefficient of the repeated sawtooth waves, when both waveforms have initially the same pressure amplitude and also the same wavelength at origin located at sound source. Therefore, N wave can propagate longer distance than the sawtooth waves with its pulselength increasing with propagation distance, while the wavelength of the repeated sawtooth waves is invariant. However, the change of the energies of both waves are governed by only a parameter which is given by product of initial slope of straightline between the shock fronts and the propagation distance.
社団法人日本音響学会の論文