Function
- Arrange the results of a free vibration analysis of the model (Natural periods of vibration, participating masses by vibration modes, etc.). Check Eigenvectors in a spreadsheet format table.
- Modal Direction Factor, Modal Participation Factor and Participation Vector have been added to the output so as to check various eigenvalue analysis results in a table.
- Check the mode shape normalized to unity (maximum eigenvector = 1).
- Table Tool in Gen NX offers a variety of powerful built-in functions. Refer to the following items for detail directions:
Usage of Table Tool
Terminology
Familiarize with Usage
Basic directions (Cell motion, selection, size control, etc.)
Data manipulation (Add, delete, modify data, etc.)
Copy/Paste data using clipboard
Supplementary Table functions
Table Sorting
Table format setting
Auto-fit column width
Graph printing
Supplementary functions by Table types
Node/Element Table
Results Table
Call
From the Main Menu select [Results] tab > [Type : Analysis Result] > [Table] group > [Result Tables] > [Vibration Mode Shape Table]
Input
(Refer to "Vibration Mode Shape")
Upon executing the Vibration Mode Shape Table function, Records Activation Dialog prompts. Click OK Button after selecting the output entities such as nodes or elements, loading conditions, construction stages, etc.
Note
Refer to Results Table of "Usage of Table Tool" for the usage of Records Activation Dialog.
Refer to Usage of Table Tool and check the following data :
Check the natural periods of vibration and the participating masses by vibration modes from the summary table of the Eigenvalue analysis results shown in the figure.
Modal Participation Masses : Mass participation by modes
Modal Participation Factor
Modal Direction Factor : Modal effective mass ratio (Participation ratios by degrees of freedom on the basis of participation ratio of each mode being set at 100%)
Reselect 'Active by Eigenmode...' in Context Menu and assign the desired mode to check the natural vibration mode vectors.
Eigenvector : for each degree of freedom
Note
Display eigenvectors in the unit consistent with the input mass unit.
Participation Vector : Eigenvector for each degree of freedom * Modal Participation Factor
Select ' Normalize by Max. Displ.' in Context Menu and assign the desired mode to check the mode shape normalized to unity.
Normalize by Max. Displ. : Display the Mode Shape normalized to unity (maximum eigenvector = 1).
Note 1
In the old version, the Mode Shape was normalized to mass using the program's internal units, N & m. In V720, the Mode Shape is normalized to mass using units consistent with the input data.
(,
: Mode Shape Vector,
: Mass in the Input Unit)
Note 2
Applicable to both Lumped Mass and Consistent Mass