Specify Design Requirements

R2026b

Add and edit design requirements, such as lower and upper amplitude bounds, step response characteristics, reference signals, and custom requirements

You can optimize the response of your Simulink^® model to meet both time-domain and frequency-domain design requirements. You can specify your requirements interactively in the app, or at the command line using requirements objects. For information about available requirements, see Supported Design Requirements.

Apps

Response Optimizer

Optimize model response to satisfy design requirements, test model robustness

Blocks

	Check Against Reference	Check that model signal tracks reference signal during simulation
	Check Custom Bounds	Check that model signal satisfies bounds during simulation
	Check Step Response Characteristics	Check that model signal satisfies step response bounds during simulation

Functions

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Time-Domain Requirements

`sdo.requirements.SignalBound`	Piecewise-linear amplitude bound
`sdo.requirements.SignalTracking`	Reference signal to track
`sdo.requirements.StepResponseEnvelope`	Step response bound on signal
`sdo.requirements.PhasePlaneEllipse`	Impose elliptic bound on phase plane trajectory of two signals
`sdo.requirements.PhasePlaneRegion`	Impose region bound on phase plane trajectory of two signals

Variable Requirements

`sdo.requirements.FunctionMatching`	Impose function matching constraint on variable
`sdo.requirements.MonotonicVariable`	Impose monotonic constraint on variable
`sdo.requirements.RelationalConstraint`	Impose relational constraint on pair of variables
`sdo.requirements.SmoothnessConstraint`	Impose bounds on gradient magnitude of variable

Frequency-Domain Requirements

`sdo.requirements.BodeMagnitude`	Bode magnitude bound
`sdo.requirements.ClosedLoopPeakGain`	Closed loop peak gain bound
`sdo.requirements.GainPhaseMargin`	Gain and phase margin bounds
`sdo.requirements.OpenLoopGainPhase`	Nichols response bound
`sdo.requirements.PZDampingRatio`	Damping ratio bound
`sdo.requirements.PZNaturalFrequency`	Natural frequency bound
`sdo.requirements.PZSettlingTime`	Settling time bound
`sdo.requirements.SingularValue`	Singular value bound

Evaluate Requirements

evalRequirement Evaluate design requirement

Check Blocks

`getbounds`	Get bounds specified in Check block
`sdo.setCheckBlockEnabled`	Enable or disable all check blocks in model

Topics

Supported Design Requirements
Time-domain and frequency-domain requirements.
Specify Time-Domain Design Requirements in the App
Specify time-domain requirements such as lower and upper amplitude bounds, step response bounds, reference signals, elliptical bounds, and custom bounds.
Specify Variable Requirements in the App
Specify monotonic, smoothness, and relational constraints on variables in your model.
Specify Frequency-Domain Design Requirements in the App
Specify frequency-domain requirements, such as gain and phase margin bounds, closed-loop peak response bounds, step-response bounds, and custom bounds.
Specify Custom Requirements in the App
This topic shows how to specify custom requirements in the Response Optimizer.
Move Constraints
Position bound edges graphically or by specifying a location.