This paper describes a numerical procedure for the optimisation of an existing restraint system including an `OEM's' airbag in front collisions. The solution process was systematically divided into four steps: (1) development of a computer model for the MADYMO computer code; (2) validation of the model by comparing the numerical and experimental results; (3) investigation of sensitivities of injury criteria to design changes; and (4) optimisation of the restraint system and airbag for minimum injury. The results indicate that the `OECM's' driver-side airbag and the existing restraint system can be substantially improved. By optimising the airbag and the restraint system separately, the overall separately, the overall injury levels are reduced by 17% and 9% respectively. When the airbag and the restraint system are optimised together, a 33% reduction of overall injury level has been achieved. It reveals that the airbag and the restraint system have to be tuned together to achieve the maximum safety performance.
Samenvatting