1. Description
This component operates the Eigenvalue Analysis Control function in Civil NX.
Eigenvalue analysis provides dynamic properties of a structure by solving the characteristic equation composed of mass matrix and stiffness matrix. The dynamic properties include natural modes (or mode shapes), natural periods (or frequencies) and modal participation factors.
The Eigenvalue Analysis Control can be found in the Civil NX main menu,select [Analysis] tab > [Analysis Control] Group > [Eigenvalue] Menu
2. Grasshopper Path
[Midas] > [Analysis] > [Eigenvalue Analysis Control]
Type 1 : Eigen Vectors-Subspace Iteration
3. Component Image
4. Input/Output Value
- Input Data
| Index | Name | Description | Type | Default |
Previous |
|---|---|---|---|---|---|
| 1 | iFREQ | Number of Frequencies | Integer | - | - |
| 2 | iTER | Number of Iterations | Integer | - | - |
| 3 | iDIM | Subspace Dimension | Integer | 0 | - |
| 4 | TOL | Convergence Tolerance | Real | 0 | - |
- Output Data
| Index | Command | Description | Type | Method |
Next |
|---|---|---|---|---|---|
| 1 | EIGV | Create Eigenvalue Analysis Control (Eigen Vectors-Subspace Iteration) |
Json | PUT |
- |
Type 2 : Eigen Vectors-Lanczos
3. Component Image
4. Input/Output Value
- Input Data
| Index | Name | Description | Type | Default |
Previous |
|---|---|---|---|---|---|
| 1 | iFREQ | Number of Frequencies | Integer | - | - |
| 2 | FRMIN * | Minmum cps | Real | - | - |
| 3 | FRMAX * | Maximum cps | Real | - | - |
| 4 | Eigen Vector Frequency range of interest | Eigen Vector Frequency range of interest | Select | false | - |
| 5 | Eigen Vectors Strum Sequence Check | Eigen Vectors Strum Sequence Check | Select | false | - |
Activation Condition
* Only for if Eigen Vector Frequency range of interest is true
- Output Data
| Index | Command | Description | Type | Method |
Next |
|---|---|---|---|---|---|
| 1 | EIGV | Create Eigenvalue Analysis Control (Eigen Vectors-Lanczos) |
Json | PUT |
- |
Type 3 : Ritz Vectors
3. Component Image
4. Input/Output Value
- Input Data
| Index | Name | Description | Type | Default |
Previous |
|---|---|---|---|---|---|
| 1 | iGNUM | Number of Generations for Each GL-link Force | Integer | - | - |
| 2 | vRITZ | Starting Load Vectors | Object | - | Eigenvalue Ritz Vectors |
| 3 | Ritz Vectors Include GL - link force vector | Include GL - link force vector | Select | false | - |
- Output Data
| Index | Command | Description | Type | Method |
Next |
|---|---|---|---|---|---|
| 1 | EIGV | Create Eigenvalue Analysis Control (Ritz Vectors) |
Json | PUT |
- |
5. Reference API Manual Link