Nastran reference manual : Pressure Freq Type 1 (lines and surfaces)


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Defines a frequency dependent dynamic pressure for frequency response problems use.
This load is very similar to "Freq Dynamic Type 1" with some changes in parameters:
A=scale factor was changed to a vector that the user has to introduce using statements: X-Pressure, Y-Pressure, and Z-Pressure.
Ft = Frequency delay is equal to zero.
= Phase lead is equal to zero.
C(f) and D(f) are functions defined by tables of interpolation. Tables have to be created before assigning this condition and associated to the condition using statements "Table Interpolation Values C[f]" or "Table Interpolation Values D[f]".
In conclusion, the final aspect of the load is as follows:

If lines are used, it is possible to select in which coordinate system (BASIC, ELEMENT) and which type of load (NORMAL, PROJECTED) will be applied to line of geometry. Descriptions of these statements are explained with more details in static loads that can be applied to lines. See these chapters for more information.
This load can be assigned over lines and affects elements of the mesh.

Remarks
This load is only available for MSC/NASTRAN and NE/NASTRAN codes.