acdecom.WaveGuide.get_modalmatrix

WaveGuide.get_modalmatrix(f, **kwargs)

Returns the modal matrix that can be used for the mode decomposition. Takes flow-effects, temperature, and pressure into account.

\[p = M p_\pm\]

where \(p_\pm\) is a row vector containing the complex mode amplitudes of all cut-on modes in \(z_+\) and \(z_-\) direction and \(p\) is a row vector with measured pressure values in the frequency domain.

Parameters

• f (float) – Frequency in Hz.

• Mach_number (float, optional) – Mach_number of the medium inside the waveguide. Defaults to the value stored in self.M. If specified, it overwrites the value stored in self.M.

• t (float, optional) – Temperature of the medium inside the waveguide. Defaults to the value stored in self.t. If specified, it overwrites the value stored in self.t.

• Ps (float, optional) – Static pressure of the medium inside the waveguide. Defaults to the value stored in self.p0. If specified, it overwrites the value stored in self.p0.

Returns

The modal matrix with the dimensions (Microphones x (2 x cuton_mode))

Return type

numpy.ndArray