NSM

Subcase Information Entry The NSM command can be used to select a non-structural mass set for mass generation.

Format

NSM = option

Example 1

In this example, NSM 12 is applied to the model for Subcase 1 and NSM 13 is applied to the model for Subcase 3. There is no non-structural mass applied to the model for Subcase 2:
SUBCASE 1
ANALYSIS=STATICS
SPC = 1
LOAD = 2
NSM=12
	
SUBCASE 2
ANALYSIS=STATICS
SPC = 3
LOAD = 4
	
SUBCASE 3
ANALYSIS=STATICS
SPC = 5
LOAD = 5
NSM=13

BEGIN BULK
NSM,12,PSOLID,3,0.3
NSM,13,PSOLID,3,0.7

Example 2

In this example, NSM 12 is applied to the model for Subcase 1 and NSM 13 is applied to the model for Subcase 3. Since there is no NSM entry within Subcase 2, the global reference of NSM 14 is used.
NSM=14
SUBCASE 1
ANALYSIS=STATICS
SPC = 1
LOAD = 2
NSM=12
	
SUBCASE 2
ANALYSIS=STATICS
SPC = 3
LOAD = 4
	
SUBCASE 3
ANALYSIS=STATICS
SPC = 5
LOAD = 5
NSM=13

BEGIN BULK
NSM,12,PSOLID,3,0.3
NSM,13,PSOLID,3,0.7
NSM,14,PSOLID,3,0.5

Definitions

Argument Options Description
option <SID>

No default
SID
Set identification number of a NSMADD Bulk Data Entry or, if NSMADD Bulk Data Entry does not exist with this SID, the set identification of NSM, NSM1, NSML and NSML1 Bulk Data Entries.

Comments

  1. Only one NSM Subcase Information Entry can be present in the model.
  2. The value of the non-structural mass does not change during Topology Optimization.
  3. The NSM Subcase Entry is currently subcase-dependent only for Linear Static Analysis and Nonlinear Static Analysis. For all other solution sequences, the NSM entry should be defined globally above the first SUBCASE statement. If the NSM Subcase Entry is specified within any subcase which is not linear static or nonlinear static, then the run will be terminated with an error. Refer to Example 1 and Example 2 for a better understanding of current support for non-structural mass.