Direct Optimization (original) (raw)
Direct Optimization https://www.lsoptsupport.com/examples/optimization/direct-optimization https://www.lsoptsupport.com/@@site-logo/LS-Opt-Support-Logo480x80.png
In this example a direct optimization method, the Genetic Algorithm, is used instead of a metamodel-based approach to solve the optimization problem explained in Crashworthiness Optimization.
The problem is of a simplified vehicle moving at a constant velocity and crashing into a pole.
| The problem illustrates the following features: A direct simulation-based optimization (Direct Genetic Algorithm) Dealing with an infeasible design formulation Use of composite functions Use of the LS-DYNA result interfaces | The criteria of interest are the following: Head injury coefficient (HIC) of a selected point (15ms) Component Mass of the structural components (bumper, front, hood and underside) Intrusion computed using the relative motion of two points Design variables: The hood, front and underside (parts 3, 4 and 5 in Fig. 1(b)) are grouped under a single design variable: thood The bumper (part 2 in Fig. 1(b)) is identified as another design variable: tbumper |
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Design Formulation
The design formulation is as follows:
- Minimize HIC(15 ms) subject to Intrusion (50 ms) < 550 mm and mass < 0.5. The intrusion is measured as the distance between the nodes 167 and 432 (for the location of the nodes see Fig. 1).