COMSOL 6.3 - mphreduction

Return reduced-order state-space matrices for a model.

data = mphreduction(model, romtag, …) extracts the reduced-order state-space matrices from the reduced-order model romtag. The reduced-order model can either be created in the COMSOL GUI or via the API.

The function mphreduction accepts the following property/value pairs:

Table 6-37: property/value pairs for the mphreduction command.
property	value	default	description
out	Cell array of strings	'all'	Names of output matrices
return	struct \| ss	struct	Return type

The following values are valid for the out property:

Table 6-38: Property/Value Pairs for the property out.
Property	expression	description
out	Kr	Stiffness matrix
	Dr	Damping matrix
	Dra	Damping ratio matrix
	Er	Mass matrix
	Br	Input matrix
	Cr	Output matrix
	F	Input feedback matrix
	B0r	Initial value input matrix
	B0rdot	Initial value time derivative input matrix
	Brdot	Time derivative input matrix
	Brdotdot	Second time derivative input matrix
	Mc	Damping matrix
	MA \| A	Stiffness matrix
	MB \| B	Input matrix
	D	Input feedback matrix
	C	Output matrix
	L	Load vector
	Y0	Output bias
	U0	Initial value vector
	Udot0	Initial derivative vector
	Kud	Stiffness matrix times ud

The return type ss requires that the Control System Toolbox is installed.