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

Open Access

Figure 3

Evolution of the norm of the relative difference with the reference impedance (10⁵ conical frustums with Bessel functions) versus the length of each frustum for different approximations (cylinders with Bessel functions, conical frustums with Bessel functions, 1st or 2nd order approximation of losses).

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