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6. Acoustic transfer function of an isothermal line
The value of introducing the matrices or thermoacoustic transfer functions of a circuit's components is obvious when modeling for optimization. The theory developed above also makes it possible to characterize an isothermal component by its characteristic matrix M di . Thus, for the case of isothermal walls, let B T ≥ 0, neglecting thermal relaxation 1/r T , and positing for acoustic admittance A U ≥ jωc u , with Δ ≥ – 4C T ≥ 4Z U A U , we finally find the following matrix:
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Acoustic transfer function of an isothermal line
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