Optimization is a capability of MSC.NASTRAN that enables
you to synthesize and optimize your designs. Sensitivity
analysis is also available in Optimization.
Optimization may be applied to the following analysis types
- Basic Analysis
- Linear statics analysis
- Normal modes analysis
- Buckling analysis
- Dynamic Response
- Modal frequency response
- Direct frequency response
- Modal transient response
- Acoustic analysis
- Shape variables are tied to the geometry
- Sizing variables are tied to finite element properties
- Shape and sizing variables can both be used in the same run
Efficient optimization algorithms permit the use of hundreds of design variables and responses for large models. Efficiencies include:
- Design variable linking - multiple design variables can be linked
- Approximation methods - three methods are provided
- Robust optimization algorithms - three methods are provided
- Constraint deletion and regionalization - only the critical constraints retained
- Restarts - optimization restarts from a completed design cycle and continued
- Adjustable convergence criteria and move limits - for faster convergence
- Sparse matrix solver - faster speed and minimal disk space
- Adjoint Sensitivity Analysis
- Mode Tracking
Either design objective or the performance constraints
| Analysis Type | Response |
|---|---|
| All | Weight Volume |
| Linear Statics | Displacement Stress Strain Force Lamina strain Lamina stress Lamina failure criterion |
| Normal modes | Normal mode number |
| Buckling | Buckling mode number |
| Frequency response | Displacement Velocity Acceleration Constraint force Stress Force |
| Transient response | Displacement Velocity Acceleration Constraint force Stress Force |
- RMS (root-mean-square) type responses
- Cost and other non-structural objectives
- Model updating to match test data
- Beam properties as a function of sectional dimensions
- Minimization of the maximum response