sdo.requirements.ClosedLoopPeakGain class

Package: sdo.requirements

Closed loop peak gain bound

Description

Specify lower or equality bounds on the closed loop peak gain of a linear system. The closed loop can be formed using negative, positive or no feedback. You can then optimize the model response to meet these bounds using sdo.optimize.

You must have Simulink^® Control Design™ software to specify closed-loop peak gain bounds.

Construction

pkgain_req = sdo.requirements.ClosedLoopPeakGain creates a sdo.requirements.ClosedLoopPeakGain object and assigns default values to its properties.

pkgain_req = sdo.requirements.ClosedLoopPeakGain(Name,Value) uses additional options specified by one or more Name,Value pair arguments. Name is a property name and Value is the corresponding value. Name must appear inside single quotes (''). You can specify several name-value pair arguments in any order as Name1,Value1,...,NameN,ValueN.

Input Arguments

Name-Value Pair Arguments

Specify optional comma-separated pairs of Name,Value arguments. Name is the argument name and Value is the corresponding value. Name must appear inside quotes. You can specify several name and value pair arguments in any order as Name1,Value1,...,NameN,ValueN.

Use Name,Value arguments to specify properties of the requirement object during object creation. For example, requirement = sdo.requirements.ClosedLoopPeakGain('Type','<=') creates an sdo.requirements.ClosedLoopPeakGain object and specifies the Type property as an upper bound.

Properties

Description	Requirement description, specified as a character vector. For example, 'Requirement on signal 1'. Default: ''
FeedbackSign	Feedback loop sign to determine the peak gain of the linear system. Must be –1 or 1. Use –1 if the loop has negative feedback and 1 if the loop has positive feedback. Default: –1
MagnitudeUnits	Magnitude units of the requirement. Must be 'db' (decibels) or 'abs' (absolute units). Default: 'abs'
Name	Requirement name, specified as a character vector. Default: ''
PeakGain	Peak gain bound. Default: 2
Type	Peak gain requirement type, specified as one of the following: '<=' — Upper bound '==' — Equality bound 'min' — Minimization objective Default: '<='

Methods

evalRequirement

Evaluate peak gain bound for linear system

Copy Semantics

Handle. To learn how handle classes affect copy operations, see Copying Objects.

Examples

Construct a closed loop peak gain object and specify peak gain requirement.

r = sdo.requirements.ClosedLoopPeakGain;
r.PeakGain = 2;

Alternatively, you can specify the peak gain during construction:

r = sdo.requirements.ClosedLoopPeakGain('PeakGain',2);

Alternatives

Use getbounds to get the bounds specified in Check Nichols Characteristics (Simulink Control Design) block.