> ## Documentation Index > Fetch the complete documentation index at: https://docs.ntop.com/llms.txt > Use this file to discover all available pages before exploring further. # Modal Analysis *** ## About this Block **What it does:** Runs an analysis on an [**Simulation Model**](/block-documentation/blocks/structures/model/simulation-model.html) 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. ## Example File Download Example: [Modal Analysis](https://storage.googleapis.com/files-learn/static/ExtendedBlockDocs/modal_buckling_analysis.ntop) ![Modal Analysis](https://storage.googleapis.com/files-learn/static/ExtendedBlockDocs/modal_analysis.png) ***

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. ### Inputs | Name | Type | Description | | - | - | - | | Model | [FE Model](../../../../block-documentation/types/fe-model) | The finite element model. | | Restraints | [Boundary Condition List](../../../../block-documentation/types/boundary-condition) | The displacement restraints. | | Number of modes | [Integer](../../../../block-documentation/types/integer) | Maximum number of modes to calculate. | | Min frequency | [Scalar](../../../../block-documentation/types/scalar) | Lower bound of returned frequencies. | | Max frequency | [Scalar](../../../../block-documentation/types/scalar) | Upper bound of returned frequencies. | ### Outputs | Type | | - | | [Modal Result](../../../../block-documentation/types/modal-result) | ***

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. ### Inputs | Name | Type | Description | | - | - | - | | Model | [FE Model](../../../../block-documentation/types/fe-model) | The finite element model. | | Restraints | [Boundary Condition List](../../../../block-documentation/types/boundary-condition) | The displacement restraints. | | Number of modes | [Integer](../../../../block-documentation/types/integer) | Maximum number of modes to calculate. | | Min frequency | [Scalar](../../../../block-documentation/types/scalar) | Lower bound of returned frequencies. | | Max frequency | [Scalar](../../../../block-documentation/types/scalar) | Upper bound of returned frequencies. | ### Outputs | Type | | - | | [Modal Result](../../../../block-documentation/types/modal-result) | ***

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 | Name | Type | Description | | - | - | - | | Model | [FE Model](../../../../block-documentation/types/fe-model) | The finite element model. | | Restraints | [Boundary Condition List](../../../../block-documentation/types/boundary-condition) | The displacement restraints. | | Number of modes | [Integer](../../../../block-documentation/types/integer) | Maximum number of modes to calculate. | | Min frequency | [Scalar](../../../../block-documentation/types/scalar) | Lower bound of returned frequencies. | | Max frequency | [Scalar](../../../../block-documentation/types/scalar) | Upper bound of returned frequencies. | ### Outputs | Type | | - | | [Modal Result](../../../../block-documentation/types/modal-result) | ***

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 | Name | Type | Description | | - | - | - | | Model | [FE Model](../../../../block-documentation/types/fe-model) | The finite element model. | | Restraints | [Boundary Condition List](../../../../block-documentation/types/boundary-condition) | The displacement restraints. | | Number of modes | [Integer](../../../../block-documentation/types/integer) | Maximum number of modes to calculate. | | Min frequency | [Scalar](../../../../block-documentation/types/scalar) | Lower bound of returned frequencies. | | Max frequency | [Scalar](../../../../block-documentation/types/scalar) | Upper bound of returned frequencies. | ### Outputs | Type | | - | | [Modal Result](../../../../block-documentation/types/modal-result) | This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.