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Lap-Shoulder Belt Performance as a Function of Occupant Size
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 11, 2005 by SAE International in United States
Annotation ability available
The Federal Motor Vehicle Safety Standards (FMVSS) require rear seat, lap/shoulder belts to “fit” Hybrid III dummies ranging in size from a 6 year old child (H3-6C) to a 95th-percentile-male (H3-95M). No dynamic performance FMVSS, however, exist for rear seat belt systems. Variations in the three-dimensional “fit” of the same lap-shoulder belt positioned around these extreme dummy sizes suggest a possible difference in performance.
The purpose of this study was to assess the performance of two production lap-shoulder belt designs in a large SUV buck on a rebound sled using instrumented H3-6C, 5th-percentile-female (H3-5F) and H3-95M dummies. Sled velocities were approximately 35 kph.
Test instrumentation included: lap and shoulder belt load transducers, triaxial accelerometers at the center of gravity of the head, triaxial accelerometers and a deflection gauge in the chest, and six-axis force (and moment) transducers in the neck of the dummy. Tests were photographed using high-speed digital photography in the oblique and lateral views at rates of approximately 1,000 frames per second. In addition, pre- and post test images were taken using still digital photography. Sensor signals were filtered according to SAE specifications. Physical evidence on the lap-shoulder belts and retractor housings were carefully documented.
A relationship exists between belt loads to the restraint as a function of occupant mass and sled velocity. Physical damage to the belt systems provides forensic evidence that varies with occupant mass, crash severity and principal direction of force.
CitationBidez, M., Hauschild, H., Syson, S., and Mergl, K., "Lap-Shoulder Belt Performance as a Function of Occupant Size," SAE Technical Paper 2005-01-1705, 2005, https://doi.org/10.4271/2005-01-1705.
Air Bags, Occupant Protection, and Child Passenger Restraints
Number: SP-1933 ; Published: 2005-04-11
Number: SP-1933 ; Published: 2005-04-11
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