This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Occupant Performance with Constant Force Restraint Systems
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1996 by SAE International in United States
Annotation ability available
An extensive study was conducted studying the optimization of seat belt and airbag systems for simultaneous use during an accident. It is an objective of this study to develop an understanding of restraint system interaction and the compromises required for the individual systems to optimize the total response. The study entailed over one hundred full scale dynamic tests controlling seat belt and airbag attributes carefully and varying these attributes methodically. The study shows that significant reductions in occupant injury criteria are possible by tuning the seat belt characteristics predominantly to approximate an ideal belted restraint system. These so called “Constant Force Restraint Systems” can be further expanded to include new levels of pretensioner performance thereby allowing significant injury criteria reduction without increased head or chest excursions. These changes to the belt system also affect the response of the airbag restraint because of the significant changes in the occupant excursion time history. Improvements in the belt system are found in three major categories; initial system stiffness, new levels of pretensioner performance, and careful tuning of the torso harness load limiting response. Further system improvements can be obtained by carefully matching the load limiting response of the torso restraint to the ride down characteristics of the airbag thereby attaining a closer approximation of ideal restraint. Such systems however will require tunability based on the operating environment at the time of the accident.
|Technical Paper||Restraint Force Optimization for a Smart Restraint System|
|Technical Paper||Thoracic Injury Risk in Frontal Car Crashes with Occupant Restrained with Belt Load Limiter|
CitationMiller, H., "Occupant Performance with Constant Force Restraint Systems," SAE Technical Paper 960502, 1996, https://doi.org/10.4271/960502.
Occupant Protection Technologies for Frontal Impact: Current Needs and Expectations for the 21st Century
Number: SP-1144; Published: 1996-02-01
Number: SP-1144; Published: 1996-02-01
- Andrew, S. Occupant Sensing in Smart Restraint Systems Proceedings, Thirty Ninth AAAM Conference Association for the Advancement of Automotive Medicine Des Plaines, IL 1995
- Fredin, S. Injury Reduction Potential for “Smart” Airbags Proceedings, Thirty Ninth AAAM Conference Association for the Advancement of Automotive Medicine Des Plaines, IL 1995
- Hontschik, H. Muller, E. Ruter, G. Necessities and Possibilities of Improving the Protective Effect of Three-Point Seat Belts Proceedings, Twenty-First Stapp Car Crash Conference 20 794 831 Society of Automotive Engineers Warrendale, PA 1977
- Johannessen, G. Mackay, M. Why “Intelligent” Automotive Occupant Restraint Systems? Proceedings, Thirty Ninth AAAM Conference Association for the Advancement of Automotive Medicine Des Plaines, IL 1995
- Mackay, M. Smart Seat Belts - Some Population Considerations Applied to Intelligent Restraint Systems SAE Paper No. 940531 Society of Automotive Engineers Warrendale, PA 1994
- Mackay, M. Intelligent Restraint Systems - What Characteristics Should They Have? Proceedings, AAAM and IRCOBI 113 126 Lyon, France September 1994
- Mertz, H. Williamson, J. Vander Lugt, D. The Effect of Limiting Shoulder Belt Load with Air Bag Restraint SAE Paper No. 950886 Society of Automotive Engineers Warrendale, PA 1995
- Miller, HJ. Injury Reduction with Smart Restraint Systems Proceedings, Thirty Ninth AAAM Conference Association for the Advancement of Automotive Medicine Des Plaines, IL 1995
- Mitzkus, J. Eyrainer, H. SAE Paper No. 840395 Society of Automotive Engineers Warrendale, PA 1984
- Svensson, L. Means for Effective Improvement of the Three Point Seat Belt in Frontal Crashes SAE Paper No. 780898 Society of Automotive Engineers Warrendale, PA 1978
- Walsh, M. Kelleher, B. Development and Evaluation of a Belt Restraint System for Small Cars Using Force Limiting Department of Transportation 1979