MDAMP

MDAMP, STLOC, V1, V2, V3, V4, V5, V6
Defines the damping ratios as a function of mode.

MP ME ST PR PRN <> <> <> PP EME MFS

STLOC

Starting location in table for entering data. For example, if STLOC = 1, data input in the V1 field applies to the first constant in the table. If STLOC = 7, data input in the V1 field applies to the seventh constant in the table, etc. Defaults to the last location filled + 1.

V1, V2, V3, . . . , V6

Data assigned to six locations starting with STLOC. If a value is already in this location, it will be redefined. Blank values for V2 to V6 leave 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 STAT command to list current values. Applies to the mode-superposition harmonic (ANTYPE,HARMIC), the mode-superposition linear transient dynamic (ANTYPE,TRANS), and the spectrum (ANTYPE,SPECTR) analyses. Repeat MDAMP command for additional constants (10000 maximum).

MDAMP can also be defined in a substructure analysis using component mode synthesis with fixed-interface method (ANTYPE,SUBSTR with CMSOPT,FIX and SEOPT,,,3). The damping ratios are added to the diagonal of the reduced damping matrix as explained in Component Mode Synthesis (CMS).

This command is also valid in PREP7.

Menu Paths

Main Menu>Preprocessor>Loads>Load Step Opts>Time/Frequenc>Damping
Main Menu>Solution>Load Step Opts>Time/Frequenc>Damping

Release 16.2 - © SAS IP, Inc. All rights reserved.