RBEs and MPCs in MSC.Nastran2课件.ppt

RBEs and MPCs in MSC.Nastran;RBEs and MPCs;Motion at one GRID drives another;Motion at one GRID drives another;RBEs and MPCs;Small Displacement Theory Rotations;Geometry-based RBAR RBE2 Geometry- User-input based RBE3 User-input based MPC;Common Geometry-Based Rigid Elements;The RBAR;The RBAR;RBAR Example: Fastener;RBAR Example: Pin-Joint;The RBE2;RBE2 Example;RBE2 Example;Common RBE2/RBAR Uses;RBE3 Elements;RBE3 Description;RBE3 Description;U99 = (U1 + U2 + U3) / 3 3 * U99 = U1 + U2 + U3 -U1 = + U2 + U3 - 3 * U99;RBE3 Is Not Rigid!;RBE3: How it Works?;RBE3: How it Works?;RBE3: How it Works?;RBE3: How it Works?;RBE3: How it Works?;Example 1;Example 1: Force Through CG;Example 1: Force Through CG;Example 1: Force Through CG ;Example 2;Example 2: Load not through CG;Example 3;Example 3: Transverse Load on Beam;Example 3: Transverse Load on Beam;Example 3: Transverse Load on Beam;Displacements with quadratic weighting factors virtually equivalent to those from RBE2 (Beam Theory), but do not impose “plane sections remain planar” as does RBE2.;Example 3: Transverse Load on Beam;Example 3: Transverse Load on Beam;Example 4;Example 4: Use RBE3 for Unconstrained Motion;Example 4: Use RBE3 for Unconstrained Motion;Example 4: Use RBE3 for Unconstrained Motion;Example 4: Use RBE3 for Unconstrained Motion;Example 4: Use RBE3 for Unconstrained Motion;Example 4: Use RBE3 for Unconstrained Motion;Example 5;Example 5: 3D to Stick Model Connection;Example 5: 3D to Stick Model Connection;Example 5: 3D to Stick Model Connection;Example 5: 3D to Stick Model Connection;Example 5: 3D to Stick Model Connection;Example 6;Example 6: Using RBE3 to Visualize “Beam” Modes;Example 6: Using RBE3 to Visualize “Beam” Modes;Example 6: Using RBE3 to Visualize “Beam” Modes;Example 6: Using RBE3 to Visualize “Beam” Modes;Example 7;Example 7: RBE3 Connection of Incompatible Elements ;Example 7: RBE3 Connection of Incompatible Elements;Example 7: RBE3 Connection of Incompatible Elements;Example 7: