Module Solver

source code

Solver.py - Multimodal wave propagation solver.

This is an implementation of the theory presented in references [1] and [2] with boundary layer loss model from reference [3].

References:

1. V. Pagneux, N. Amir, and J. Kergomard, "A study of wave propagation in varying cross-section waveguides by modal decomposition. Part I. Theory and validation," J. Acoust. Soc. Am., vol. 100, 1996, pp. 2034-2048.
2. Amir, N., Pagneux, V., & Kergomard, J. (1997). A study of wave propagation in varying cross-section waveguides by modal decomposition. Part II. Results. The Journal of the Acoustical Society of America, 101(5), 2504-2517.
3. Bruneau, A. M., Bruneau, M., Herzog, P., & Kergomard, J. (1987). "Boundary layer attenuation of higher order modes in waveguides." Journal of Sound and Vibration, 119(1), 15-27.

Example:

>>> import wiat
>>> din = 0.02
>>> dout = 0.025
>>> f = numpy.arange(50.,500.,10.)
>>> air = wiat.util.air_properties(25.)
>>> c = wiat.MM.Waveguides.QuarterCircleHorn(din, dout)
>>> rad = wiat.MM.Radiation.RadiationFlanged(dout)
>>> Z5 = wiat.MM.Solver.SolveImpedance(c,rad,f,air,5)