Time Varying Forward Projection Using WavenumberFormulation

摘要

The association of the wavenumber method with the FFT algorithm is regarded as a more efficient tool than the Rayleigh integral method for determining harmonicrnacoustic fields from planar radiators. Nevertheless the limitation of this method is that it does not match to the determination of acoustic fields whose sound emission is non-stationary and not limited in time. Therefore the purpose of this work is to provide a method of reconstruction of non-harmonic acoustic fields using in the wavenumber domain a time domain impulse response formulation. Explanations about the theory to reach the impulse response are presented in the paper. A real-time prediction of the acoustic wave propagation in the near-field of vibrating structure or in waveguide for applications in active control is given by the formulation. Numerical simulations are also reported to validate the method. The topic of the simulations is the analysis of non-stationary sound sources.