Nonlinear Acoustic Propagation in the Atmosphere

Numerical Modeling using the Nonlinear Progressive Wave Equation (NPE)

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Outdoor Sound Propagation

Figures 10.a and 10.b show the evolution of the spectrum as a function of altitude for the previous signals during propagation.

Fig. 10.a : Evolution of the spectrum versus altitude during the linear acoustic propagation

Fig. 10.b : Evolution of the spectrum versus altitude during the nonlinear acoustic propagation

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