LVSCALE, FACT, LDSTEP
Scales the load vector for mode-superposition analyses.
FACTScale factor applied to both the real and imaginary (if they exist) components of the load vector. Defaults to 0.0.
LDSTEPSpecifies the load step number from the modal analysis (MODCONT,ON). It corresponds to the load vector number. Defaults to 1. The maximum admissible value is the number of vectors written in the Jobname.MODE file.
Specifies the scale factor for the load vector that was created in a modal (ANTYPE,MODAL) analysis. Applies only to the mode-superposition transient analysis (ANTYPE,TRANS), mode-superposition harmonic analysis (ANTYPE,HARMIC), random vibration analysis (ANTYPE,SPECTR with SPOPT,PSD), and multiple point response spectrum analysis (ANTYPE,SPECTR with SPOPT,MPRS). For PSD and MPRS analyses, LVSCALE is only applicable for pressure loading.
The LVSCALE command supports tabular boundary
conditions (%TABNAME_X%) for FACT input
values only as a function of time in the mode-superposition transient
(ANTYPE,TRANS) or as a function of frequency in
mode-superposition harmonic (ANTYPE,HARMIC).
MPC contact generates constraint equations that can include constant terms (included on the right-hand side of the system equation). The LVSCALE command scales the constant terms.
In mode-superposition transient and harmonic analyses, all of the load vectors need to be scaled in the first load step. Use a zero scale factor if they are not actually used in this first load step. Similarly, in random vibration and multipoint response spectrum analyses, all of the load vectors need to be scaled in the first participation factor calculation (PFACT). Use a zero scale factor if they are not actually used for the first input table.
This command is also valid in PREP7.