Anthropomorphic Dummy Positioning and Repeatability Measurements

NHTSA · 1981 · ROSA P / United States. National Highway Traffic Safety Administration

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Summary

This 1981 report by Dynamic Science, Inc., funded by the National Highway Traffic Safety Administration (NHTSA), evaluates the repeatability of anthropomorphic dummy positioning and the feasibility of proposed seat belt compliance procedures. The study was motivated by industry concerns regarding a Notice of Proposed Rulemaking for Federal Motor Vehicle Safety Standard (FMVSS) No. 208. Critics argued that the proposed requirement—mandating that torso belts fall within a specific "belt fit zone" on a Part 572 test device—lacked objectivity due to poor repeatability and might force manufacturers to violate anchorage location requirements specified in FMVSS 210. The research comprised two tasks. Task 1 assessed the repeatability of dummy placement across four vehicle types: a 1980 Volkswagen Rabbit, a 1979 Chevrolet Citation, a 1979 Chevrolet C-10 pickup, and a 1980 Ford Econoline 150 van. Two independent technicians placed two different Part 572 dummies into the driver’s seat of each vehicle for a total of forty trials. Seat belt anchorages were modified to ensure the belt fell within the fit zone, and landmark positions (head, shoulder, hip) were measured relative to the vehicle’s seating reference point. Task 2 investigated the sensitivity of belt position to dummy placement variations using the Chevrolet C-10. The dummy was subjected to large deviations, including upward and downward shifts via weights or blocks, and forward or rearward movements, to determine if the belt remained within the fit zone. The results indicated that repeatability in positioning the upper torso of the dummy was poorer for the van and pickup truck than for the passenger cars, as evidenced by larger standard deviations in head and shoulder target measurements. However, despite these positional variations, the dislocation of the belt centerline relative to the fit zone remained approximately the same across all vehicles. This demonstrated that belt position within the fit zone is not highly sensitive to variations in dummy placement. In Task 2, the torso belt remained within the fit zone even with significant deviations in dummy position. Regarding regulatory compliance, three of the four vehicles met FMVSS 210 anchorage requirements after modification. The Volkswagen Rabbit failed to meet the standard because the modified upper torso anchor angle exceeded the allowable 80-degree limit by 7 degrees.

Key finding

Repeatability in the positioning of the upper torso of the dummy was poorer for the van and pick-up than for passenger cars, but the position of the belt in the belt fit zone is not highly sensitive to variations in dummy position.

Methodology

lab_experiment

Sample size: 40

Provenance

The full processing record for this entry. Every stage of this paper's journey through the pipeline is logged — what ran, with which tool and model, how many attempts it took, and when it last completed. Discovered via bulk_ingest_rosap on 2026-05-23 (6 acquisition events logged).

Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.

Topics

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• seat belt use

Information type

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• Applied Guidance: standards test procedures