The predicted influence of changes to the vehicle front end profile on the flexible lower legform impactor performance.

Paper #:
  • 2018-01-1047

Published:
  • 2018-04-03
Abstract:
Abstract: The global requirements of pedestrian protection for lower leg impacts to vehicle fronts, for both Regulatory and consumer assessment rating purposes, are now firmly assigned to vehicle development and is a key influence to the vehicle design and style from the outset of the vehicle engineering process. Today, for pedestrian lower leg impact protection, the flexible lower legform impactor is the assigned impactor. This impactor, by virtue of its increased flexibility and more biofidelic response compared to the previous WG17 impactor, requires careful consideration of the vehicle front end profile and positioning of the key pedestrian protection features. The typical key pedestrian protection features that’s are engineered for the lower legform impact are the bonnet front edge, the bumper, and the lower valance or lower spoiler. At the early stages of the vehicle programme, the front end style will undergo numerous iterations, and it is important to qualify the potential risks to meeting the required engineering attribute targets. To support the subjective evaluation of the vehicle front end styling from concept CAS (computer aided surface) for pedestrian protection at this critical early stage of the vehicle programme, a spring model, representing the key pedestrian protection features, was created and correlated to a reference vehicle model. A DoE (Design of Experiment) was then generated, based on the correlated spring model, to understand the influence of the position of all the key pedestrian protection features on the flexible lower legform performance. The predicted vehicle front end styling influences were tabulated as a result of the DoE study. This paper will discuss the spring model setup, the correlation results, the DoE conditions, and the subsequent results and predicted styling influences that affected the results.
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