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Damping ratio bound


Specify bounds on the damping ratio of the poles of a linear system. You can then optimize the model response to meet these bounds using sdo.optimize. You can also use this object to specify overshoot bound.

You must have Simulink® Control Design™ software to specify damping ratio requirements.




dampReq = sdo.requirements.PZDampingRatio creates a sdo.requirements.PZDampingRatio object and assigns default values to its properties.


dampReq = sdo.requirements.PZDampingRatio(Name=Value) specifies one or more properties using name-value arguments. For example, dampReq = sdo.requirements.PZDampingRatio(DampingRatio=0.8) creates an sdo.requirements.PZDampingRatio object and sets the damping ratio to 0.8

Before R2021a, use commas to separate each name and value, and enclose Name in quotes. For example, dampReq = sdo.requirements.PZDampingRatio("DampingRatio",0.8) creates an sdo.requirements.PZDampingRatio object and sets the damping ratio to 0.8.


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Damping ratio bound, specified as a finite scalar between 0 and 1.

Requirement description, specified as a character vector. For example, 'Requirement on signal 1'.

Requirement name, specified as a character vector.

Damping ratio bound type, specified as one of the following:

  • '<=' — Upper bound

  • '>=' — Lower bound

  • '==' — Equality bound

  • 'max' — Maximization objective

Object Functions

setOvershootSet overshoot of sdo.requirements.PZDampingRatio object
getOvershootGet overshoot from sdo.requirements.PZDampingRatio object
evalRequirementEvaluate design requirement
copyCopy design requirement
getGet design requirement property values
setSet design requirement property values


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Construct a damping ratio object and specify the damping ratio.

r = sdo.requirements.PZDampingRatio;
r.DampingRatio = 0.1;

Alternatively, you can specify the damping ratio during construction.

r = sdo.requirements.PZDampingRatio('DampingRatio',0.1);


Use getbounds to get the bounds specified in a Check Pole-Zero Characteristics (Simulink Control Design) block.

Version History

Introduced in R2010b