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The Application of Optimization Techniques to Problems of Automotive Crashworthiness
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English
Abstract
A method for automating the selection of front-end structural stiffnesses for barrier impact standards is presented. Presently the standard analysis tool is the impact simulation method in which static nonlinear force-deformation curves of components are used in a computer integration of the equations of motion. Current design methods involve manually modifying the force-deformation curves to produce an acceptable design. This process may be significantly improved by the use of optimization methods.
An improved impact simulation model which calculates the steering column envelopment is introduced. To express the effect of passenger compartment deceleration on potential injury, a vehicle crash severity index is introduced and is shown to be positively correlated with potential injury based on the chest severity index. An optimization technique is used to find a set of design variables which will satisfy constraints placed on the above measures of crashworthiness; namely, the steering column envelopment and the vehicle crash severity index. The shape similarity of force-deformation curves from car to car for a given component suggests the use of a scale factor on the curves as a design variable.
Authors
Citation
Bennett, J., Lin, K., and Nelson, M., "The Application of Optimization Techniques to Problems of Automotive Crashworthiness," SAE Technical Paper 770608, 1977, https://doi.org/10.4271/770608.Also In
References
- Kamal, M. M. “Analysis and Simulation of Vehicle to Barrier Impact,” SAE Transactions 79 Paper 700414 1970
- Lin, K. H. Augustitus, J. A. Kamal, M. M. “Computer Simulation of Vehicle-to-Barrier Impact -- A User's Guide,” Research Publication GMR-1943 General Motors Research Laboratories Warren, Michigan August 8 1975
- Danforth, J. P. Randall, C. D. “Modified ROS Occupant Dynamics Simulation User Manual,” Research Publication GMR-1254 General Motors Research Laboratories Warren, Michigan October 26 1972
- Bennett, J. A. “Automated Design of Multi-Objective Systems,” ASME Design Engineering Technical Conference Washington, D. C. ASME Paper 75-DET-111 September 1975
- Vanderplaats, G. N. “CONMIN-A FORTRAN Program for Constrained Function Minimization,” NASA TM-X-62.282 August 1973