MDAMP
MDAMP, STLOC, V1, V2, V3, V4, V5, V6
Defines the damping ratios as a function of mode.
STLOCStarting location in table for entering data. For example, if
STLOC= 1, data input in theV1field applies to the first constant in the table. IfSTLOC= 7, data input in theV1field applies to the seventh constant in the table, etc. Defaults to the last location filled + 1.V1,V2,V3, . . . ,V6Data assigned to six locations starting with
STLOC. If a value is already in this location, it will be redefined. Blank values forV2toV6leave the corresponding previous value unchanged.
Notes
Defines the damping ratios as a function of mode. Table position corresponds to mode number. These ratios are added to the DMPRAT value, if defined. Use the STAT command to list current values. This command applies to mode-superposition harmonic (ANTYPE,HARMIC), mode-superposition linear transient dynamic (ANTYPE,TRANS), and spectrum (ANTYPE,SPECTR) analyses. Repeat the MDAMP command for additional constants (10000 maximum).
MDAMP can also be defined in a substructure analysis that uses component mode synthesis. The damping ratios are added on the diagonal of the reduced damping matrix, as explained in Component Mode Synthesis (CMS).
This command is also valid in PREP7.