Development of simplified models for design and optimization of automotive structures for crashworthiness

Simplified models can be useful for up-front design of automotive structures for passenger safety during crash. Formulations based on the system identification approach are presented for development of simplified models for simulation and design for automotive crash environment. Numerical crash data available from experiments or simulations are used in the development of such models. Parametric as well as nonparametric formulations of the problem are investigated. Standard nonlinear programming optimality conditions and methods are used to solve the resulting nonlinear identification problem. Simple numerical examples are solved to illustrate the proposed formulations and methodologies. As a practical example, the front horn of an automotive structure is replaced by a single degree of freedom system (SDOF). Two basis functions that identify the given target data are studied: Hat functions (piecewise linear) and Chebyshev polynomials. Effects of the number of design variables on the final solution to the problem are investigated. In addition, using the identified SDOF model, redesign of the front horn to improve its performance is discussed.

Authors and Affiliations

1. Optimal Design Laboratory, College of Engineering, The University of Iowa, Iowa City, Iowa 52242 USA e-mail: Jasbir-Arora@uiowa.edu, , , , , , US

   C.H. Kim, A.R. Mijar & J.S. Arora

Received March 2, 2000 Revised manuscript received November 14, 2000

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