This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Dynamic Analysis of ELR Retractor Spoolout
Technical Paper
2001-01-3312
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Contemporary production emergency locking seatbelt retractors (ELRs) have been proven very effective in the crash environment for which they have been primarily designed and most adequately tested, that is, in the full frontal crash mode. However, researchers have documented spool out during offset, angled, override, underride, and rollover crashes where seatbelt retractors are subject to acceleration pulses in varying directions, including the vertical plane. Occupant motions during these real world accident modes may also impart loads into the belts and belt hardware (webbing and buckle assemblies) that may not be immediately apparent in the frontal barrier test mode. Numerous laboratory studies have demonstrated that the inertial sensor can be held in the neutral position when an overriding opposing force is applied to the retractor, resulting in webbing spool out. Various ELR designs include ball and cage sensors, pendulum, and disk systems.
These authors have mounted various typical production ELR type retractors to testing apparatus capable of applying acceleration pulses in various directions. These experiments demonstrate, via high-speed video, the potential for belt spool out with an opposing, overriding force. Moreover, these experiments, when considered with respect to real world out-of-plane crashes, explain the significant belt spool out documented in the field.
Recommended Content
Authors
Topic
Citation
Meyer, S., Hock, D., Herbst, B., and Forrest, S., "Dynamic Analysis of ELR Retractor Spoolout," SAE Technical Paper 2001-01-3312, 2001, https://doi.org/10.4271/2001-01-3312.Also In
References
- Meyer, S.E. Davis, M. Chng, D. Herbst, B Forrest, S. 2000 “Three-Point Restraint System Design Considerations for Reducing Vertical Occupant Excursion in Rollover Environments,” 2000 SAE International Congress & Exposition Detroit, MI
- Meyer, S.E. Forrest, S. Hayden, J. 2000 “The Effect of Vertical Acceleration Pulses on Emergency Locking Seatbelt Retractors,” 48 2000 Advances in Bioengineering ASME
- Renfroe, D.A. 1996 “Rollover Ejection While Wearing Lap and Shoulder Harness: The Role of the Retractor,” SAE 960096
- Viano, D.C. 1992 “Crash Injury Prevention: A Case Study of Fatal Crashes of Lap-Shoulder Belted Occupants,” SAE 922523
- Viano, D.C. 1992 “Restraint of a Belted or Unbelted Occupant by the Seat in Rear-End Impacts,” SAE 922522
- Viano, D.C. Arepally, S. 1990 “Assessing the Safety Performance of Occupant Restraint Systems,” SAE 902328
- Rains, G.C. Kanianthra, J.N. 1995 “Determination of the Significance of Roof Crush on Head and Neck Injury to Passenger Vehicle Occupants in Rollover Crashes,” SAE 950655
- Shaibani, S. 1991 “Characteristics of Safety Systems Activated by Inertial Sensors,” 19th International Workshop on Human Subjects for Biomechanical Research San Diego, CA
- Shaibani, S. 1992 “Performance of Inertial Sensors During Multiplanar Travel,” 20th International Workshop on Human Subjects for Biomechanical Research Seattle, WA
- Adomeit, D. Balser, W. 1987 “Items of an Engineering Program on an Advanced Web-clamp Device,” SAE 870328 1987 SAE International Congress and Exposition Detroit, MI
- Stucki, L. Galganski, R.A. 1987 “Safety Performance Improvement of Production Belt System Assemblies,” SAE 870654 1987 SAE International Congress and Exposition Detroit, MI
- Moffatt, E.A. Thomas, T.M. Cooper, E.R. 1995 “Safety Belt Buckle Inertial Responses in Laboratory and Crash Tests,” SAE 950887
- Molz, F.J. IV, Bidez, M.W. Zeidler, F Breitner, R. 1997 “Spinal Burst or Compression Fractures within Automotive Crashes Due to Vertical Force Components,” SAE 970498
- Arndt, M.W. 1998 “Testing of Seats and Seat Belts for Rollover Protection Systems in Motor Vehicles,” SAE 982295