control.DescribingFunctionNonlinearity

class control.DescribingFunctionNonlinearity[source]

Bases: object

Base class for nonlinear systems with a describing function.

This class is intended to be used as a base class for nonlinear functions that have an analytically defined describing function. Subclasses should override the __call__ and describing_function methods and (optionally) the _isstatic method (should be False if __call__ updates the instance state).

Methods

`__call__`	Evaluate the nonlinearity at a (scalar) input value.
`describing_function`	Return the describing function for a nonlinearity.

__call__(A)[source]: Evaluate the nonlinearity at a (scalar) input value.

describing_function(A)[source]

Return the describing function for a nonlinearity.

This method is used to allow analytical representations of the describing function for a nonlinearity. It turns the (complex) value of the describing function for sinusoidal input of amplitude A.

Parameters

Afloat: Amplitude of the sinusoidal input to the nonlinearity.

Returns

float: Value of the describing function at the given amplitude.