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Crash Sensing and Algorithm Development for Frontal Airbag Systems Using CAE Methods and Mechanical Tests
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 08, 2004 by SAE International in United States
Annotation ability available
Mathematical models in combination with mechanical tests were used to develop a frontal crash sensing system and algorithm. The required sensor closure time for the initiation of driver side airbag deployment was estimated by means of multi body dynamics occupant models. The crash sensing system and algorithm were developed using predictions from a finite element model of the front structure of a passenger vehicle. All models were validated by means of mechanical tests. Generally good agreement was obtained between the predictions from the models and the results from the mechanical tests.
In the sensor closure time analysis two occupant sizes were used, the 50%-ile male and the 5%-ile female occupant. Two restraint conditions were evaluated, no belt and a belt system incorporating a pretensioner. A number of crash pulses of various severity were used. In the analysis proper sensor closure time was found to be the time it takes a free flying mass to travel 94 mm minus 30 ms (inflation time of the airbag).
To properly deploy an airbag system in a crash an airbag initiation algorithm was designed. The algorithm was developed using mechanical test results and mathematical model predictions. In the mechanical tests carried out for this purpose the front structure of a medium size passenger vehicle was mounted on a cart. The cart with front structure was impacting various objects at various impact speeds.
The algorithm was relative velocity based using crush zone and centrally mounted accelerometers. The algorithm was able to discriminate between crashes in which the airbag should be initiated and crashes in which the airbag should not be initiated. The airbag initiation time computed using the algorithm was allowing for timely initiation and inflation of a driver side airbag for protection of a passenger vehicle occupant.
|Technical Paper||Tradeoffs Encountered in Evaluating Crash Sensing Systems|
|Technical Paper||Advancements in Crash Sensing|
|Technical Paper||Development of CAE-Based Crash Sensing Algorithm and System Calibration|
CitationPipkorn, B., "Crash Sensing and Algorithm Development for Frontal Airbag Systems Using CAE Methods and Mechanical Tests," SAE Technical Paper 2004-01-1633, 2004, https://doi.org/10.4271/2004-01-1633.
CAE Methods for Vehicle Crashworthiness and Occupant Safety, and Safety-Critical Systems
Number: SP-1870; Published: 2004-03-08
Number: SP-1870; Published: 2004-03-08
- Department of Transportation 2003 National Highway Traffic Safety Administration Federal Motor Vehicle Standards (FMVSS 208) June 2003
- Allianz Zentrum fur Technik GMBH AZT-Procedure for Conducting a Low Speed 15 km/h Offset Insurance Crash Test to Determine the Damageability and Repairability Features of Motor Vehicles Allianz Zentrum fur Technik GMBH (AZT)
- Kullgren, A. Krafft, M. Tingvall, C. Lie, A. 2003 Combining Crash Recorder and Paired Comparison Technique:Injury Risk Functions in Frontal and Rear Impacts with Special Reference to Neck Injuries Eighteen International Technical Conference on the Enhanced Safety of Vehicles Paper Nagoya, Japan. Paper no 404
- Chan, C-Y. 2000 Fundamentals of Crash Sensing in automotive Air Bag Systems Society of Automotive Engineers 0-7680-0499-3 37 51
- Dalmotas 1996 Air Bag Deployment Crashes in Canada Fifteenth International Technical Conference on the Enhanced Safety of Vehicles Melbourne 1996 155 167
- Lin, C. Neal, M. Wang, J. T. 2000 Can Finite Element Model be Used to Aid in Calibrating a Crash Sensing System? 2000 ASME Design Engineering Technical Conference & Computers and Information in Engineering Conference Sept 10-13 2000 Baltimore, Maryland
- Chou, C. Le, J. Chen, P. Bauch, J. D. 2001 Development of CAE Simulated Crash Pulses for Airbag Sensor Algorithm/Calibration in Frontal Impacts Seventeenth International Technical Conference on the Enhanced Safety of Vehicles Amsterdam 2001
- Liu, J. K-H. 1993 SIR Sensor Closure Time Prediction for Frontal Impact Using Full Vehicle Finite Element Analysis SAE Paper 930643
- Stutzler, F-J. Chou, C.C. Le, J. Chen, P. 2003 Development of CEA-Based Crash Sensing Algorithm and System Calibration, Airbags and Safety Test Methodology 121 131 SAE Paper 2003-01-0509
- Hanssen, A., G. Lorenzi, L. Berger, K. K. Hopperstad, O. S. Langseth, M. 2000 A Demonstrator Bumper System Based on Aluminum Foam Filled Crash Boxes International Journal of Crash 2000 5 4 381 392