1
Download Chapter 2 EXECUTIVE CONTROL COMMANDS
Transcript
SPC User’s Reference Manual Bulk Data Entry SPC Defines sets of single-point constraints and static enforced displacements. Format and Example: 1 SPC SPC 2 3 4 5 6 7 8 SID GID1 DOF1 δ1 GID2 DOF2 δ2 103 133 Field 1 1.25 106 1 Contents 9 10 -2.4 Data Range Default SID Single-point constraint set identification number. [1] Integer>0 Required GIDi GRID or SCALAR point identification numbers. Integer>0 Required DOFi List of degrees of freedom. DOF Code Required di Value of enforced displacement for all components designated by GIDi and DOFi. [2] Real 0.0 Remarks: 1. Single-point constraint sets must be selected in the Case Control packet with the command: SPC = SID 2. Enforced displacements in dynamics are defined using TLOADi and RLOADi Bulk Data entries. They may not be defined using the SPC Bulk Data entry. 3. The component DOFi specified are placed in the s-set. Therefore, they must not appear on Bulk Data entries such as MPC, SUPORT or OMIT, that place them in mutually exclusive sets. 4. SPC degrees of freedom may be redundantly specified as permanent constraints on GRID Bulk Data entries. 5. In Nonlinear Steady State Heat Transfer analysis, all boundary condition degrees of freedom which have prescribed temperature values must be specified using both SPC and TEMP or TEMPD Bulk Data entries. The boundary condition values which are used by UAI/NASTRAN are those specified on the TEMP or TEMPD entries. These Bulk Data entries must also be selected with the TEMP(ESTIMATED), TEMP(MATERIAL) or TEMP(BOTH) Case Control command. UAI/NASTRAN BULK DATA 7-333 7 BULK
