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Linear Spectral Analysis

This filter sets the settings for linear spectral analysis.

Filter "Linear spectral analysis" sets the settings for linear spectral analysis.

Select Arrays (Point Values For Processing or Total Values For Processing) to process the results.

Methods to get the final results (Absolute sum, Sqaure root of sum of squares, Complete quadratic combination) get the final response result using different combinations of modal results.

Field Add preload solution takes into account the static solution while getting the final result.

Constant Mode Damping Ratio and Damping Ratio Data sets the damping coefficient numerically or tabularly, respectively.

Field Resonse Spectrum data sets tabular dependences of acceleration, velocity, and displacement spectra on frequency.

Summation of the load selects a method for combining the response results when loading along one axis to obtain the final result when loading along several axes.

Property Description Default Limitation
Point Values For Processing Possibility to select fields whose results will be displayed All fields are included  
Total Values For Processing Similar to Point Values For Processing. The difference is the results of the total values ​do not depend on the choice of nodes Off (option of calculating reactions is disabled in the preprocessor); All fields are included (option of calculating reactions is enabled in the preprocessor)  
Absolute sum, Sqaure root of sum of squares, Complete quadratic combination Methods to get the final results Three methods are included  
Add preload solution While getting the final result , it takes into account the static solution Off  
Constant Mode Damping Ratio Sets the damping coefficient numerically 0.01 Non-negative number
Damping Ratio Data The possibility to set a csv table of damping coefficient values depending on the mode number   Csv-file reads by the reader. "," is used as the data separator for columns.The file should contain a column with mod numbers and a column of damping coefficients.The first line of the file should contain column names without spaces:

'mode' - column of mode numbers;

'ksi' - column of damping coefficients.

If the mod number in the file is greater than the total number of mods in the calculation, this line is ignored. For modes not specified in the file, a constant damping coefficient of the mode is applied. Example file:

mode,ksi

2.0.5

10.0.1
Resonse Spectrum data Possibility to set csv-table of displacement spectrum values ​​(velocity, acceleration) depending on frequency   Csv-file reads by the reader."," is used as the data separator for columns. The file must contain a column of frequencies and columns of components of the displacements (velocities, accelerations) spectrum along the coordinate axes. The first line of the file should contain column names without spaces.

"f" - column of frequencies;

"dx"/"dy"/"dz" - spectrum of displacements along the corresponding axes;

"vx"/"vy"/"vz" - spectrum of velocities;

"ax"/"ay"/"az" - acceleration spectrum.

Only one type of spectrum can be used for each coordinate direction. Example file:

f,dy,az

0,1,0,5,1

10,-0,1,0,2
Summation of the load The possibility to choose a method for combining the response results when loading along one axis to obtain the final result when loading along several axes Off (loading along one axis); Sum (loading along several axes)