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Using Vehicle EDR Data to Calculate Motorcycle Delta-V in Motorcycle-Vehicle Lateral Front End Impacts
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on April 14, 2020 by SAE International in United States
This research focuses on the use of Event Data Recorders (EDR) to assist in calculating speed loss or Delta-V undergone by a motorcycle in a broadside type impact into a vehicle. One common methodology in calculating motorcycle Delta-V utilizes measurement of the deformation to both the vehicle and motorcycle. In certain scenarios however, it becomes difficult to calculate the motorcycle Delta-V from analysis of deformation. For instance, if the front suspension becomes fractured or separated on the motorcycle, or the motorcycle collides with the wheel area of the vehicle, deformation measurement may be unfavorable. If the struck vehicle has EDR data, this could be a useful tool in calculating motorcycle Delta-V or corroborating motorcycle Delta-V calculations from crush or other methodologies. Certain parameters critical to calculation of motorcycle Delta-V must be considered, including the appropriate effective mass to use for the motorcycle/rider combination. In addition, comparisons were made between instrumented yaw rate and calculated yaw rate to account for the airbag control module (ACM) location. In this study, three crash tests were performed in which a motorcycle with dummy rider traveling at roughly 42 to 50 mph collided into the right front corner of a vehicle traveling between 5 and 16 mph. In all three tests, both the vehicle and motorcycle were instrumented with triaxial accelerometers and triaxial rate gyros. The first test involved a 2002 Kawasaki ZRX1200R traveling at 42.2 mph into the right front corner of a 2009 Chevrolet Malibu traveling at 5 mph. The impact occurred just forward of the vehicle’s right front wheel area. The second test involved a 2006 Yamaha YZF-R6 traveling at 48.1 mph into the right front corner of a 2012 Ford Focus traveling at 16.2 mph. The impact occurred near the vehicle’s right front headlight/bumper reinforcement area. The third test involved a 2013 Kawasaki Ninja EX300 traveling at 50.5 mph into the right front corner of a 2015 Nissan Sentra traveling at 8 mph. Again, the impact occurred near the vehicle’s right front headlight/bumper reinforcement area. In all the tests, the vehicle ACM-recorded data underreported the longitudinal Delta-V in the range of 0.5-0.8 mph. Additionally, in all tests the vehicle ACM-recorded data overreported the lateral Delta-V by 0.4-0.5 mph. This overreporting was present after adjustments were made for the ACM location. Overall, the EDR data was able to predict the motorcycle Delta-V within a range of -4.7 mph to +4.8 mph. The underpredicted values were calculated with full rider and motorcycle weight, and the overpredicted values were calculated with half the rider weight.