Abstract:

Proposed a method to measure the gravity center of vehicle crash test dummy parts, because the position of gravity center is an important parameter that needs be guarantee. Used an estimation method of uncertainty estimation in indirect measurement based on the moment balance principle to analyze the  measurement error. Designed and manufactured a device to measure and display the gravity center of crashtest dummy-parts directly based on single chip microcomputer technology. Tests validated the accuracy of the device. The results show that the measurement accuracy is related to the mass of dummy parts and the distance between 3 supporting points. The device is easy to operate with a gravity-center measuring-precision of 70 μm at a 200 mm distance between the supporting points of sensors, while the maximum theoretical error of this method is 29 μm.

Key words: automotive passive safety, vehicle crash tests,  dummy, parts&rsquo, gravity centers, moment equilibrium, single-chip micro computers