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findStructuralDamping

Find damping model assigned to structural dynamics model

Description

example

dma = findStructuralDamping(structuralmodel.DampingModels) returns the damping model and its parameters assigned to the structural dynamics model. The toolbox supports the proportional (Rayleigh) damping model and the modal damping model. The parameters of the proportional damping model are the mass and stiffness proportional damping parameters. The parameter of the modal damping model is the modal damping ratio.

Use this function to find which damping model and parameters are currently active if you made multiple damping assignments.

Examples

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Find the damping model assignment for a 3-D model.

Create a transient structural model.

structuralModel = createpde('structural','transient-solid');

Import and plot the geometry.

importGeometry(structuralModel,'Block.stl');
pdegplot(structuralModel,'CellLabels','on')

Specify the stiffness proportional damping parameter.

structuralDamping(structuralModel,'Beta',40);

Now specify the mass proportional damping parameter.

structuralDamping(structuralModel,'Alpha',10);

Check the damping parameter assignment for structuralModel. Notice that the Beta parameter is empty.

findStructuralDamping(structuralModel.DampingModels)
ans = 
  StructuralDampingAssignment with properties:

      RegionType: 'Cell'
        RegionID: 1
    DampingModel: "proportional"
           Alpha: 10
            Beta: []
            Zeta: []

When you specify damping parameters by calling the structuralDamping function several times, the toolbox uses the last assignment. Specify both the mass and stiffness parameters.

structuralDamping(structuralModel,'Alpha',10,'Beta',40);

Check the damping parameter assignment for structuralModel.

findStructuralDamping(structuralModel.DampingModels)
ans = 
  StructuralDampingAssignment with properties:

      RegionType: 'Cell'
        RegionID: 1
    DampingModel: "proportional"
           Alpha: 10
            Beta: 40
            Zeta: []

Input Arguments

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Damping model of the structural model, specified as a DampingModels property of a StructuralModel object.

Output Arguments

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Damping model assignment, returned as a StructuralDampingAssignment object. For details, see StructuralDampingAssignment Properties.

Introduced in R2018a