mdof.modes

mdof.modes(inputs, outputs, dt, **options)

Fundamental periods P and modeshapes Phi identification from input and output arrays.

Parameters:

• inputs (array) – input time history. dimensions: \((q,nt)\), where \(q\) = number of inputs, and \(nt\) = number of timesteps.

• outputs (array) – output response history. dimensions: \((p,nt)\), where \(p\) = number of outputs, and \(nt\) = number of timesteps

• dt (float) – timestep.

• method (string, optional) – system identification method. default is “srim”, other options are “okid-era” and “okid-era-dc”.

• decimation (int, optional) – decimation factor. default: 1

Returns:

(P, Phi)

Return type:

tuple of 1D array, ND array