Archives ESA


Jacobian Ratio – Surface Mesh Quality

The quality of a surface mesh can be checked in Patran by using the following commands:   Elements -> Verify -> Element -> Jacobian Ratio -> Apply   The surface mesh should have a maximum of near 1.

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Cyclic Symmetry

Two different methods: Read More...

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Rotating Nodal coordinate frames

Finite Elements - Modify - Node - Edit: Analysis Coord system = Coord 1 – Reference Coord System = Coord 1 - Analysis - solution type - normal modes - solution parameters - enable: cyclic symmetry - write out a nastran input deck - in Additional Information: Product Family: MSC.

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Multi-Point Constraints MPC – RBE2 & RBE3

This article describes the concept of the Rigid Elements in NASTRAN.

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RIGID – RBE2

Example of a 1/8 symmetry plate that is simply supported along the outer edge, clamped with a ‘bolt head’ up to a certain diameter, and loaded with a pressure.

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RBE2

Use to connect a concentrated mass with 6 DOF to solid element nodes with 3 DOF Read More...

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RBE3

RBE3 is the most commonly used interpolation element.

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Example 1 – RBE3 used to prevent rigid body displacement

In this example we restrain an externally pressurized cylinder that is free-free, i.

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RBE3 Usage Example: More Flexible Attachments

Date: 2-18-05, by Paul Curry A comparison of the RBE2 and RBE3 multi-point constraint elements.

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MPC’s used in Random Vibration Analysis

With a model created, meshed and with a static check run completed and validated, create a single base node for excitation.

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