Transfer matrix of a truncated cone with viscothermal losses: application of the WKB method

Open Access

Figure 4

Deviation of the resonance parameters to those of the reference impedance (conical frustums with ZK-losses for equivalent radius) for different approximations (cylinders with ZK-losses, conical frustums with 1st or 2nd order approximation of losses): (a) resonance frequencies and (b) resonance magnitudes. Finest slicing (10⁵ conical frustums of m).

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