Research Papers

Lower Universal Anchorages and Occupant Safety In Rear Impacts

Version 1
Date added June 15, 2000
Downloaded 0 times/fois
Category 2000 General Meeting BlainVille
Tags Student Paper Award Winner
Author/Auteur Simone Lalande
Award/Prix Étudiant 1 Student


The Universal Children’s Restraint Anchorage system (UCRA) is a new method of installing an infant or a child restraint into a vehicle without the use of a seat belt. This system consists of an upper top tether and two lower anchorages. The system will be legislated by Transport Canada. Preliminary studies had shown that an adult or an older child seated in a vehicle seat fitted with lower anchorages may be injured during a rear impact if the anchorages are too far forward. The challenge was to develop tests to be incorporated into the UCRA safety regulation to minimize injuries to adults from the anchorages. Vehicle manufacturers would have the option of complying with either a dynamic rear impact test or a static push test. An acceptable injury threshold level had to be determined. Before full scale tests were done, pendulum tests were conducted to ensure that the pressure measuring technique to be used was appropriate. Next, ten dynamic rear impact tests were staged to measure the actual pressure at the buttocks of test dummies. Fourteen static push tests were then conducted using various loading rates to accurately simulate a dynamic test. The injury threshold level was found to be 13 800 kPa for both the dynamic and static push tests. To minimize testing costs, the procedures for both tests were developed so that the method would be identical to that used for other regulatory tests already required in the Canadian safety regulations. The static push test would use a loading rate to be determined by more testing. If the recorded pressure does not exceed 13 800 kPa during either test, the vehicle would be in compliance.

Simone Lalande