Techniques for Developing Child Dummy Protection Reference Values. Event Report

Klinich, Kathleen DeSantis; Saul, Roger A.; Auguste, Gaston; Backaitis, Stanley; Kleinberger, Michael · 1996 · ROSA P / United States. Department of Transportation. National Highway Traffic Safety Administration

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Summary

This 1996 report by the Child Injury Protection Team addresses the critical need for developing Protection Reference Values (PRV) for child anthropomorphic test devices (dummies) used in out-of-position (OOP) child/airbag interaction testing. The study distinguishes between injury criteria, which apply to humans, and PRV, which apply to dummies, noting that dummy biofidelity limitations necessitate distinct values. The research was motivated by the lack of specific data for child occupants in OOP scenarios, such as infants in rear-facing seats or unrestrained older children near deploying airbags, where standard frontal restraint data is inapplicable. The methodology involves a comprehensive review of existing literature and data sources to derive these values. The authors examine child physiology, highlighting anatomical differences from adults, such as larger head-to-body mass ratios, flexible skulls with fontanelles, and immature cervical vertebrae, which alter injury mechanisms like spinal cord stretch injuries. The report analyzes biomechanical properties, including age-dependent variations in bone modulus of elasticity and tendon strength. It also reviews epidemiological data from the 1988–1991 NASS database to identify injury patterns, noting that head and face injuries are most frequent. Furthermore, the study evaluates various techniques for establishing injury criteria, including cadaver testing, surrogate testing, accident reconstructions, and the scaling of adult data. The report details the characteristics of specific child dummies, including CRABI, TNO, and Hybrid III models for infants, three-year-olds, and six-year-olds. Key findings indicate that children possess distinct biomechanical responses; for instance, pediatric bone exhibits lower modulus of elasticity and higher energy absorption before fracture compared to adult bone. Epidemiological analysis reveals that while most children sustain minor injuries, severe injuries (MAIS 3+) are rare but often involve the head or neck in OOP airbag interactions. The report identifies that standard adult injury criteria, such as Head Injury Criterion (HIC), may not accurately predict infant brain injury due to skull flexibility and fontanelle presence. The authors summarize available data from cadaver tests, accident reconstructions, and dummy testing programs to propose specific PRV. These proposed values are derived through scaling adult data using anthropometric and mechanical factors, as well as direct analysis of child-specific test results. The significance of this work lies in providing a foundational framework for evaluating child safety in airbag interactions. By establishing PRV tailored to child dummies, the report aims to improve the accuracy of crash testing for OOP scenarios, thereby enhancing the design of restraint systems and airbags for pediatric occupants. The conclusions emphasize that while children may be more resilient in some contexts, their unique anatomical vulnerabilities require specialized protection metrics. The recommendations include further refinement of dummy biofidelity and the continued development of child-specific injury criteria to ensure comprehensive safety standards.

Key finding

Child anatomical differences, including flexible skulls and undeveloped neck muscles, necessitate specific injury criteria distinct from adult standards for out-of-position airbag testing.

Methodology

review

Provenance

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Topics

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• child passenger safety

Information type

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• Empirical Findings: crash risk outcomes