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FE Model, Restraints, Integer, Scalar, Scalar

FE Model, Restraints, Integer, Scalar, Scalar, 1.1.0

FE Model, Restraints, Integer, Scalar, Scalar, 1.2.0

FE Model, Restraints, Integer, Scalar, Scalar, 1.3.0

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About this Block

What it does: Runs an analysis on an Simulation Model that calculates its natural frequencies (eigenfrequencies) and their corresponding mode shapes. Common uses:
  • Understanding the vibrational characteristics of your model.
Tips:
  • Free modes of vibration calculations don’t consider forces. Therefore, we don’t need to use them in the boundary conditions.
  • Run free-free modal analysis by not providing any Restraints.
  • You can bound the minimum and maximum frequencies, but it will return an error if there are no natural frequencies in that range.
  • When the calculation is complete, a Head’s Up Display (HUD) will appear that allows you to visualize the block’s results. The block’s visibility must be on to see the results window.
  • You can change the min and max values in the colormap by clicking on their values.
  • The “Deformation scale” controls the exaggeration of the displacement for visual inspection.
  • To access the eigenfrequencies, open the Info Panel > Properties. Scroll down and expand the eigenfrequencies. Drag these into the Notebook to use the values.
  • It is recommended to use a Quadratic Geometric order FE Mesh with any analysis to get the most accurate results.

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Example File

Download Example: Modal Analysis Modal Analysis

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FE Model, Restraints, Integer, Scalar, Scalar

Calculate the natural frequencies and mode shapes of an FE Model subject to prescribed boundary conditions. This block calculates a specified number of vibration modes. Providing minimum and maximum frequencies bounds the range of frequencies to be returned. Removing the optional Restraints input leads to a free-free Modal Analysis.

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Inputs

NameTypeDescription
ModelFE ModelThe finite element model.
RestraintsBoundary Condition ListThe displacement restraints.
Number of modesIntegerMaximum number of modes to calculate.
Min frequencyScalarLower bound of returned frequencies.
Max frequencyScalarUpper bound of returned frequencies.

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Outputs

Type
Modal Result

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FE Model, Restraints, Integer, Scalar, Scalar, 1.1.0

Calculate the natural frequencies and mode shapes of an FE Model subject to prescribed boundary conditions. This block calculates a specified number of vibration modes. Providing minimum and maximum frequencies bounds the range of frequencies to be returned. Removing the optional Restraints input leads to a free-free Modal Analysis.

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Inputs

NameTypeDescription
ModelFE ModelThe finite element model.
RestraintsBoundary Condition ListThe displacement restraints.
Number of modesIntegerMaximum number of modes to calculate.
Min frequencyScalarLower bound of returned frequencies.
Max frequencyScalarUpper bound of returned frequencies.

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Outputs

Type
Modal Result

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FE Model, Restraints, Integer, Scalar, Scalar, 1.2.0

Calculate the natural frequencies and mode shapes of an FE Model subject to prescribed boundary conditions. This block calculates a specified number of vibration modes. Providing minimum and maximum frequencies bounds the range of frequencies to be returned. Removing the optional Restraints input leads to a free-free Modal Analysis.

​
Inputs

NameTypeDescription
ModelFE ModelThe finite element model.
RestraintsBoundary Condition ListThe displacement restraints.
Number of modesIntegerMaximum number of modes to calculate.
Min frequencyScalarLower bound of returned frequencies.
Max frequencyScalarUpper bound of returned frequencies.

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Outputs

Type
Modal Result

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FE Model, Restraints, Integer, Scalar, Scalar, 1.3.0

Calculate the natural frequencies and mode shapes of an FE Model subject to prescribed boundary conditions. This block calculates a specified number of vibration modes. Providing minimum and maximum frequencies bounds the range of frequencies to be returned. Removing the optional Restraints input leads to a free-free Modal Analysis.

​
Inputs

NameTypeDescription
ModelFE ModelThe finite element model.
RestraintsBoundary Condition ListThe displacement restraints.
Number of modesIntegerMaximum number of modes to calculate.
Min frequencyScalarLower bound of returned frequencies.
Max frequencyScalarUpper bound of returned frequencies.

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Outputs

Type
Modal Result