psdunit#

SpectrumOptions.psdunit(tblno='', type_='', gvalue='', **kwargs)#

Defines the type of input PSD.

Mechanical APDL Command: PSDUNIT

Command default:

Acceleration (ACEL) spectrum (acceleration 2 /Hz).

Parameters:
tblnostr

Input table number.

type_str

Label identifying the type of spectrum:

  • DISP - Displacement spectrum (in terms of displacement 2 /Hz ).

  • VELO - Velocity spectrum (in terms of velocity 2 /Hz ).

  • ACEL - Acceleration spectrum (in terms of acceleration 2 /Hz ).

  • ACCG - Acceleration spectrum (in terms of g 2 /Hz ).

  • FORC - Force spectrum (in terms of force 2 /Hz ).

  • PRES - Pressure spectrum (in terms of pressure 2 /Hz ).

gvaluestr

Value of acceleration due to gravity in any arbitrary units for Type=ACCG. Default is 386.4 in/sec 2.

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.