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International Journal of Automotive Technology > Volume 4(3); 2003 > Article
International Journal of Automotive Technology 2003;4(3): 135-140.
OPTIMAL RELIABILITY DESIGN FOR THIN-WALLED BEAM OF VEHICLE STRUCTURE CONSIDERING VIBRATION
S. B. LEE1, S. BAIK2, H. J. YIM1
1Kookmin University
2Ahtti
ABSTRACT
In the deterministic optimization of a structural system, objective function, design constraints and design variables are treated in a nonstatistical fahion. However, such deterministic engineering optimization tends to promote the structural system with less reliability redundancy than obtained with conventional design procedures using the factor of safety. Consequently, deterministic optimized structures will usually have higher failure probatilities than unoptimized structures. Therefore, a balance must be developed between the satistactions of the design requirements and the objectives of reducing manufacturing cost. This paper proposes the reliability-based design optimization (RBDO) technique, which enables the optimum design that considers confidence level for the vibration characteristics of structrual system. Response surface method (RSM) is utilized to approximate the performance functions describing the system characteristics in the RBDO procedure. The proposed optimization technique is applied to the pillar section design considering natural frequencies of a vehicle structure.
Key Words: Body in white (B.I.W.), first-order reliability method (FORM), Monte Carlo simulation (MCS), Reliability-based design optimization (RBDO), Response surface method (RSM), Thin-walled beam
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