PARAM, HFREQ

Parameter

Values

Description

HFREQ

<Real>
(Hertz)

Default = None

Defaults

If PARAM, HFREQ is input without specifying a value, the solution runs into an error

Modes with frequencies higher than HFREQ are not used in Modal Frequency Response and Modal Transient Analysis.

HFREQ is used in Response Spectrum Analysis to specify the upper bound of the frequency range of interest for modal combination.

1.	The Residual Vector (RESVEC) calculation still includes the modes above HFREQ so that they are normalized correctly.

2.	Modes that are eliminated by PARAM, HFREQ will display:

a)	an “S” next to the mode number if the mode is eliminated by MODESELECT in one subcase and PARAM, HFREQ in another subcase, or

b)	an “H” next to the mode number if the mode is eliminated only by PARAM, HFREQ.