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Brumbelow, Matthew L.
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Next Steps for the IIHS Side Crashworthiness Evaluation Program

Insurance Institute for Highway Safety (IIHS)-Raul A. Arbelaez, Becky C. Mueller, Matthew L. Brumbelow, Eric R. Teoh
Published 2019-07-08 by The Stapp Association in United States
Abstract - IIHS has been conducting side impact crash tests since 2003. To understand how the side crashworthiness program can be enhanced, an ongoing research effort is focused on understanding the correlation between IIHS ratings and driver death rate. In addition, the performance of good-rated late-model vehicles has been assessed in higher severity side crash tests. The purpose of this short communication is to summarize the ongoing work and potential next steps toward developing a new crash test procedure or updating ratings criteria to further advance side crashworthiness.
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Evaluation of US Rear Underride Guard Regulation for Large Trucks Using Real-World Crashes

Insurance Institute for Highway Safety-Matthew L. Brumbelow, Laura Blanar
Published 2010-11-03 by The Stapp Association in United States
Current requirements for rear underride guards on large trucks are set by the National Highway Traffic Safety Administration in Federal Motor Vehicle Safety Standards (FMVSS) 223 and 224. The standards have been in place since 1998, but their adequacy has not been evaluated apart from two series of controlled crash tests. The current study used detailed reviews of real-world crashes from the Large Truck Crash Causation Study to assess the ability of guards that comply with certain aspects of the regulation to mitigate passenger vehicle underride. It also evaluated the dangers posed by underride of large trucks that are exempt from guard requirements. For the 115 cases meeting the inclusion criteria, coded data, case narratives, photographs, and measurements were used to examine the interaction between study vehicles. The presence and type of underride guard was determined, and its performance in mitigating underride was categorized. Overall, almost one-half of the passenger vehicles had underride damage classified as severe or catastrophic. These vehicles accounted for 23 of the 28 in which occupants were killed. For the cases…
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Measurement Error in Lateral Thoracic Deflection and Deflection Rate Due to Oblique Loading

Insurance Institute for Highway Safety-Matthew L. Brumbelow, David S. Zuby
Published 2007-04-16 by SAE International in United States
Anthropometric test devices (ATDs) instrumented with potentiometers and accelerometers are used regularly to assess thoracic injury risk in side impact crash tests. Measurements from these sensors are compared with injury assessment reference values (IARVs) for lateral loading to establish the risk of injury for humans subjected to similar impacts. In crash tests, the deflections and deflection rates derived from these two types of sensors (potentiometers vs. accelerometers) have varying degrees of agreement. In some cases, differences can be relatively large. In the past, it was unclear whether the reason for the differences was off-axis loading that misaligned the accelerometers used in the calculation, an inherent inability of the potentiometer to capture high deflection rates under certain conditions, or some other phenomenon. Lateral pendulum impacts were conducted using a SID-IIs ATD with varying degrees of off-axis loading and were filmed from above with a high-speed digital imager. Under oblique loading conditions, the potentiometer's rotation caused the sensor to underreport the full lateral component of deflection rate by 3-5 percent and deflection by 12-22 percent. Rotation of…
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