PSDUNIT
PSDUNIT, TBLNO
, Type
, GVALUE
Defines the type of input PSD.
TBLNO
Input table number.
Type
Label identifying the type of spectrum:
DISP
—
Displacement spectrum (in terms of displacement2/Hz ).
VELO
—
Velocity spectrum (in terms of velocity2/Hz ).
ACEL
—
Acceleration spectrum (in terms of acceleration2/Hz ).
ACCG
—
Acceleration spectrum (in terms of g2/Hz ).
FORC
—
Force spectrum (in terms of force2/Hz ).
PRES
—
Pressure spectrum (in terms of pressure2/Hz ).
GVALUE
Value of acceleration due to gravity in any arbitrary units for Type=ACCG. Default is 386.4 in/sec2.
Notes
Defines the type of PSD defined by the PSDVAL, COVAL, and QDVAL commands.
Force (FORC) and pressure (PRES) type spectra can be used only as a nodal excitation.
GVALUE
is valid only when type ACCG
is specified. A zero or negative value cannot be used. A parameter
substitution can also be performed.
This command is also valid in PREP7.