A response surface-based deterministic and robust multi-objective optimisation for side impact scenario is presented. Two conflicting objectives, structural weight and front door velocity are minimised simultaneously, under a set of crash safety constraints. This constrained, vector optimisation problem is solved using the in-house optimisation code GDOT. Mixed design variables (continuous and discrete) are considered in this problem where material properties are varied between HSS and MS. The deterministic multiobjective optimisation shows that the both weight and front door velocity can be reduced simultaneously (by 28 and 5.82%, respectively) with improved safety performance. This study shows the distribution of higher yield strength material on the B-pillar inner panel with lower yield strength material on the floor-side inner panel to improve on the vehicle performance under side impact. Two robustness quantification strategies are studied and it is shown that robust optimal front shifts away from its deterministic counterpart, indicating that both objective values increase once we introduce robustness. This behaviour corroborate that the optimal front is shifts away from the constraint boundary on inclusion of robustness criteria. The effects of user-defined robustness parameters are also discussed. Also, the use of an archive of computed feasible solutions for computational efiiciency is attempted and it reduces the number of function evaluations quite significantly (depending on the precision required), especially with robustness, to hasten the optimisation process. Looking at a broader picture, this methodology can potentially fill the gap between numerically optimised system development and simulation-driven product development process by aming to achieve designs that are 'first-time right'.
Multi-objective robust optimisation for crashworthiness during side impact
Robuste Gesamtoptimierung des Aufprallenergieabsorptionsvermögens bei einem seitlichen Aufprall
International Journal of Vehicle Design ; 43 , 1-4 ; 116-135
2007
20 Seiten, 14 Bilder, 8 Tabellen, 11 Quellen
Aufsatz (Zeitschrift)
Englisch
Anwendung im Fahrzeugbau , Pkw (Personenkraftwagen) , Aufprallenergieabsorptionsvermögen , Aufprall , Verkehrsunfall , Gewichtsminimierung , Materialeigenschaft , Fahrzeugsicherheit , Karosserie , Produktentwicklung , Systementwurf , stabile Bauweise , Konstruktionsmethodik , Rechnersimulation , Design-Optimierung
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