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Auto/Steel Partnership - American Iron and Steel Institute

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Primary Changes<br />

• Topological changes<br />

- LH rail<br />

- RH rail<br />

- Bumper design<br />

- Rail extension joint<br />

- Shot gun <strong>and</strong> fender<br />

• Length of front rail section reduced by 100 mm<br />

• ULSAB tire size changed from 195/60 R15 to 205/60 R16<br />

• Vehicle lumped mass increased by 360 lb<br />

LIGHTWEIGHT FRONT END STRUCTURE<br />

Phase I Final Report<br />

Design Space<br />

Secondary Changes<br />

Due to topological modifications in the LH rail, secondary changes were<br />

made to the following:<br />

• Suspension tower (Skirt)<br />

• Cradle – 2 nd U bar<br />

• Engine bracket <strong>and</strong> engine mount bracket<br />

• Reinforcement added in the middle of the LH rail, due to rail bump, <strong>and</strong><br />

at rear of the rail, due to tire flop (rail plan curvature change)<br />

Due to topological modifications in the RH rail, secondary changes were<br />

made to the following:<br />

• Suspension tower (Skirt)<br />

• Battery size <strong>and</strong> position changed due to changes in the front rail<br />

design<br />

• Reinforcement added at the front of the RH rail, due engine divot, <strong>and</strong><br />

at the rear of the rail, due to tire flop (rail plan curvature change)<br />

The bumper height <strong>and</strong> width were suitably increased in order to achieve a<br />

better crush pattern (see Chapter 4, Bumper Design).<br />

Front End Components Selected For Upgraded Package Studies<br />

The following parametric studies were performed for the upgraded package:<br />

• Static stiffness<br />

• Dynamic stiffness<br />

• NCAP<br />

• IIHS<br />

Details of the parameters selected for the upgraded package studies can<br />

be obtained from Parametric Study/Design of Experiments [5].<br />

<strong>Auto</strong>/<strong>Steel</strong> <strong>Partnership</strong><br />

22

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