This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Load-cell barrier measurements of geometric compatibility
Published June 07, 2000 by Institution of Mechanical Engineers in United Kingdom
In the United States, the National Highway Traffic Safety Administration (NHTSA) routinely measures the force exerted on the rigid barrier in frontal crash tests. Thirty-six load cells on the barrier face measure the distribution of the crash forces. This study examined the load cell barrier data collected during recent years to assess the geometric distribution of the crash forces.
The location of the force center was proposed as a metric for quantitatively describing the geometric properties of the crash forces. The center of force location was calculated for each column of load cells. Variations in the center of force location across the width of the barrier were examined for typical vehicles.
Valid load cell barrier measurements have been made for fifty 1995-1999 vehicles tested in the NCAP program by NHTSA. In this study, values for the center of force and the total barrier force are presented for these fifty vehicles. This paper shows the range of the proposed geometric compatibility parameter measured on cars, pickups, vans, and multi-purpose vehicles, and examines how relationship changes with vehicle crush.
A comparison of the center of force for different vehicles indicated a considerable range between passenger cars and light trucks. The height of the center of force changed with crush distance, and there was a trend for the difference in height among vehicles to decrease with crush distance. The range of the center of force was larger when measured in the center of the vehicle than when measured at the left and right sides. Data filtering introduced distortion in the barrier force measurements at small values of vehicle crush. For low amounts of vehicle crush, unfiltered barrier data was recommended calculating the center of force.