Stiffness CSV format for direct load identification

You can define Frequency Response Functions (FRFs) in a StiffnessCsv file format for visualization in post-processing scenarios or as input to direct stiffness Load Identification solutions. FRFs are the response of a structural or vibro-acoustic model under applied loads. In this case, they are stiffnesses per frequency.

StiffnessCsv file format

The StiffnessCsv format is a comma-separated value (CSV) file that contains header information followed by pairs of response and excitation data.

VERSIONFRFUNITSFORMATTARGET_IDTARGET_COMPTitleData...TARGET_IDTARGET_COMPTitleData...

StiffnessCsv strings

The format consists of the following information.

String	Description
VERSION	Version of the StiffnessCsv file format. The current version is 1.
FRF	Type of FRF data in the file, such as, Force / Displacement.
UNITS	Units for the data. For example, force length-1 or angle (degree or radian). If the data is real/imaginary, only one unit type is required.
FORMAT	Format of the data. For example, magnitude/phase or real/imaginary.
TARGET_ID	Response (output) and excitation (input) node IDs.
TARGET_COMP	Target response and excitation Degrees of Freedom: X, Y, or Z.
Title	Title of the column of data when plotted. You can enter a separate title for each column of data.
Data	FRF data. Column 1 contains frequency, column 2 contains response data, and column 3 contains excitation data.

StiffnessCsv file example

The following example contains response-excitation data for Nodes 10 and 11 for components X and Z, and response-excitation data for Nodes 12 and 19 for component Y.

VERSION, 1, 0,FRF, Frequency,Force/Displacement,UNITS,kHz,N/m,rad,FORMAT,Magnitude,Phase,TARGET_ID,10,11,TARGET_COMP,X,X,Frequency,Magnitude,Phase,100,1.111,2.222,200,3.21,1.32,300,1.111,2.222,400,3.21,1.32,500,1.111,2.222,600,3.21,1.32,700,1.111,2.222,800,3.21,1.32,900,1.111,2.222,1000,3.21,1.32,TARGET_ID,10,11,TARGET_COMP,Z,Z,Frequency,Magnitude,Phase,100,2.111,3.222,200,4.21,2.32,300,2.111,3.222,400,4.21,2.32,500,2.111,3.222,600,4.21,2.32,700,2.111,3.222,800,4.21,2.32,900,2.111,3.222,1000,4.21,2.32,TARGET_ID,12,19,TARGET_COMP,Y,Y,Frequency,Magnitude,Phase,100,5.111,6.222,200,2.21,4.32,300,5.111,6.222,400,2.21,4.32,500,5.111,6.222,600,2.21,4.32,700,5.111,6.222,800,2.21,4.32,900,5.111,6.222,1000,2.21,4.32,

StiffnessCsv in post-processing scenarios

When you create a post-processing scenario, you can load a StiffnessCsv .csv file for visualization as a function plot.

To load the file, in the Select Data Source dialog box, from the Format list, select StiffnessCsv.

The software plots the FRFs as frequency and response.

Plot of the X component

You can select the target response and excitation nodes and their components to visualize. The name of the FRF in the Selection node of the Scenario Based Data-Visualization Navigator is displayed as the response node ID and target component followed by the excitation node ID and target component. For example:

R:10:X | E:11:X

For more information, see Create data sources from external files.

Using StiffnessCsv to define FRFs in Load Identification solutions

When you create a direct stiffness Load Identification solution, you can specify a StiffnessCsv .csv file to define the FRFs. You specify the file in the Frequency Response Functions dialog box.

For more information, see Load Identification.

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Stiffness CSV format for direct load identification, Simcenter 3D 2021.1 Series

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