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Performance Evaluation of Child Dummies and Baboons in Child Restraint Systems in a Systematized Crash Environment
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English
Abstract
A three-part program was undertaken to establish an appropriate means of evaluating child restraints in automobile crashes.
A standard seat was designed to provide a reproducible test base on which to evaluate child restraint systems in dynamic testing. Developmental and evaluation data are presented, including child restraint performance tests. Results showed the standard seat to be a durable, repeatable, and economical test platform which provides a realistic base for evaluation of child restraint systems.
Commercially available three- and six-year-old child dummies were evaluated for their anthropometric measurements and dynamic response characteristics in pendulum impact tests and simulated crashes in representative automobile-child seat restraint environments. Simulated crashes included 20 and 30 mph frontal and 20 mph side impacts on automobile and specially designed bench seats. Two types of child seats, the G. M. “Love Seat” and Chrysler “Mopar,” were selected for testing as representative of belt and padding restraint types currently in use.
The three-year-old child dummies were found to be capable of providing repeatable measurements of the head and chest accelerations and head deflections in sled tests and to be sufficiently sensitive of detecting differences in the crash environments.
Acceleration measurements on both six-year-old child dummies were found to contain resonances.
An extensive sled testing was performed with child restraint systems to determine which of the two types of dummies simulate best the in-vivo response of primates and what criteria may be employed to measure the dummy response and the efficacy of child protection systems. Test results indicate that the mechanical test dummy, consisting of clearly defined adjustable body segments, is a better simulator than the lumped mass unadjustable type. Test results also indicate that current instrumentation technology for application to in-vivo subjects is not adequately developed to permit consistent measurements in terms of “G” levels, injury criteria, etc. A better correlative measure between primates and mechanical child dummies is the head excursion, in both the forward- and lateral-collision modes. This is, however, limited to the first collision phase and is not valid for the rebound phase. The tested shield-type child restraint exposed the occupant to potential risk of ejection during the rebound mode of the forward-collision phase and to substantial excursion in lateral collisions if the seat does not have provisions for limiting the lateral motion of the test subject.
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Authors
- Stanley H. Backaitis - Dept. of Trans., National Hwy. Traffic Safety Admin.
- Jere W. Medlin - Dept. of Trans., National Hwy. Traffic Safety Admin.
- Vladislav G. Radovich - Dept. of Trans., National Hwy. Traffic Safety Admin.
- Richard L. Stalnaker
- Mahesh P. Shah
- John T. Shaffer - 6570th Aerospace Med. Res. Lab.
- Robert M. Letscher - 6570th Aerospace Med. Res. Lab.
Citation
Backaitis, S., Medlin, J., Radovich, V., Stalnaker, R. et al., "Performance Evaluation of Child Dummies and Baboons in Child Restraint Systems in a Systematized Crash Environment," SAE Technical Paper 751153, 1975, https://doi.org/10.4271/751153.Also In
References
- Young J. W. McConville J. T. Reynolds H. M. Snyder R. G. “Anthropometric Dimensions Representative of Average Three and Six Year Old Children Sizes for the Construction of Mastermodel Body Forms,” Final Report DOT HS-801-638 April 1975
- Schreck R. M. Patrick L. M. “Frontal Crash Evaluation Tests of the GM Child Seat Harness,” Research Publication GMR-1780 January 10 1975
- Massing D. E. Naab K. N. Yates P. E. “Performance Evaluation of New Generation 50th Percentile Anthropomorphic Test Devices, Volumes I and II,” Final Reports DOT-HS-801-431 and DOT-HS-801-432 March 1975
- Piziali R. A. “An Evaluation of the Performance Characteristics of Anthropomorphic Test Devices, Volume I,” Final Report DOT-HS-800-869 June 1973