sdo.requirements.PZDampingRatio class

Package: sdo.requirements

Damping ratio bound

Description

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.

Construction

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

gainphase_req = sdo.requirements.PZDampingRatio(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.PZDampingRatio('Type','>=') creates an sdo.requirements.PZDampingRatio object and specifies the Type property as a lower bound.

Properties

DampingRatio	Damping ratio bound. Must be a finite scalar between 0 and 1. Default: 0.7071
Description	Requirement description, specified as a character vector. For example, 'Requirement on signal 1'. Default: ''
Name	Requirement name, specified as a character vector. Default: ''
Type	Damping ratio bound type, specified as one of the following values: '<=' — Upper bound '>=' — Lower bound '==' — Equality bound 'max' — Maximization objective Default: '>='

Methods

evalRequirement	Evaluate damping ratio bound on linear system
getOvershoot	Convert damping ratio to equivalent overshoot value
setOvershoot	Set overshoot to an equivalent damping ratio

Copy Semantics

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

Examples

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);

Alternatives

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