A Parametric Study of a Side Airbag System to Meet Deflection Based Criteria

[+] Author and Article Information
Yngve Håland

Autoliv AB, Research, S-447 83 Vårgårda, Sweden

Bengt Pipkorn

Department of Injury Prevention, Chalmers University of Technology, S-412 96 Göteborg, Sweden

J Biomech Eng 118(3), 412-419 (Aug 01, 1996) (8 pages) doi:10.1115/1.2796025 History: Received September 14, 1994; Revised August 28, 1995; Online October 30, 2007


A side airbag system comprising a 12 liter bag to cover the BioSid chest and the abdomen down to the arm rest level, and 75 mm of padding to cover the pelvic/thigh area was evaluated by a series of sled tests at two different velocities, 10 m/s and 12 m/s. The initial bag (over) pressure was varied from 0 to 80 kPa and the bag ventilation area was varied from zero to 1500 mm2 . Compressed air was used to fill the bag. It was found that the ventilation of the bag reduced the maximum chest deflection by 30 percent and the maximum viscous criterion, VC, by 50 percent (comparison was made with the same bag without ventilation). A suitable initial bag (over) pressure was found to be about 40 kPa, when the loading of the abdomen was also taken into consideration. The results indicate that the chest deflection is proportional to the door average velocity (during the first 20 ms of deflection) to the power of about 2 and that the VC is proportional to the same velocity to the power of about 4. It was also found that a 12 liter ventilated side airbag resulted in 30–40 percent lower chest deflection and about 60 percent lower VC than 50 mm of chest padding (Ethafoam 220).

Copyright © 1996 by The American Society of Mechanical Engineers
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