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Measurement Error in Lateral Thoracic Deflection and Deflection Rate Due to Oblique Loading
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 16, 2007 by SAE International in United States
Annotation ability available
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 the rib accelerometer under similar loading conditions produced readings 2 percent higher than the lateral peak deflection rate and 5-9 percent higher than the lateral peak deflection. These results suggest that improvements to ATD designs or new sensor technologies are needed.
CitationBrumbelow, M. and Zuby, D., "Measurement Error in Lateral Thoracic Deflection and Deflection Rate Due to Oblique Loading," SAE Technical Paper 2007-01-0705, 2007, https://doi.org/10.4271/2007-01-0705.
- American Automobile Manufacturers Association. 1998. Comment to the National Highway Traffic Safety Administration on Advanced Technology Air-bags (AAMA S98-13) - Attachment C: Proposal for Dummy Response Limits for FMVSS 208 Compliance Testing. Docket No. NHTSA 98-4405, Notice 1; DMS Document No. NHTSA-1998-4405-79, Dec. 17, 1998. Washington, DC.
- Mertz H.J., and Weber D.A., 1982. Interpretations of the impact responses of a three-year-old child dummy relative to child injury potential. Proceedings of the 9th International Technical Conference on Experimental Safety Vehicles, 368-76. Washington, DC: National Highway Traffic Safety Administration
- Mertz H.J., 1993. Anthropomorphic test devices. Accidental Injury: Biomechanics and Prevention (eds. A.M. Nahum and J.W. Melvin), 66-84. New York, NY: Springer-Verlag.
- Mertz H.J.,; Prasad P.,; and Irwin N.L., 1997. Injury risk curves for children and adults in frontal and rear collisions (SAE 973318). Proceedings of the 41st Stapp Car Crash Conference (P-315), 13-30. Warrendale, PA: Society of Automotive Engineers.
- Pintar F.A ,; Yoganandan N ,; Hines M.H.,; Maltese M.R.,; McFadden J.,; Saul R.,; Eppinger R.,; Khaew-pong N.,; and Kleinberger M., 1997. Chestband analysis of human tolerance to side impact (SAE 973320). Proceedings of the 41st Stapp Car Crash Conference (P-315), 63-74. Warrendale, PA: Society of Automotive Engineers.
- Viano D.C.,; Fan A.,; Ueno K.,; Walilko T.,; Cava-naugh J.,; and King A., 1995. Biofidelity and injury assessment in EuroSID I and BioSID (SAE 952731). Proceedings of the 39th Stapp Car Crash Conference, 307-25. Warrendale, PA: Society of Automotive Engineers.
- International Organization for Standardization. 1997. Road vehicles: anthropomorphic side impact dummy; Lateral impact response requirements to assess the biofidelity of the dummy. ISO/TC22/ SC12/WG5 Document N455, Revision May 4, 1997. Geneva, Switzerland.
- Byrnes K.,; Abramczyk J.,; Berliner J.,; Irwin A.,; Jen-sen J.,; Kowsika M.,; Mertz H.J.,; Rouhana S.W.,; Scherer R.,; Shi Y.,; Sutterfield A.,; Xu L.,; Tylko S.,; and Dalmotas D., 2002. ES-2 dummy biomechanical responses (SAE 2002-22-0018). Proceedings of the 46th Stapp Car Crash Conference (P-383), 353-396. Warrendale, PA: Society of Automotive Engineers.
- Cesari D.,; Compigne S., ; Scherer R.,; Xu L.,; Taka-hasi N.,; Page M.,; Asakawa K.,; Kostyniuk G.,; Haut-mann E.,; Bortenschlager K.,; Sakurai M.,; and Hari-gae T., 2001. WorldSID prototype dummy biomechanical responses (SAE 2001-22-0013). Proceedings of the 45th Stapp Car Crash Conference (P-375). Warrendale, PA: Society of Automotive Engineers.
- Scherer R.D.,; Kirkish S.L.,; McCleary J.P., ; Rou-hana S.W.,; Athey J.B.,; Balser J.S.,; Hultman R.W.,; Mertz H.J.,; Berliner J.M.,; Xu L.,; Kostyniuk G.W.,; Salloum M.,; Wang Z.,; and Morgan C.R., 1998. SID-IIs Beta+-prototype dummy biomechanical responses (SAE 983151). Proceedings of the 42nd Stapp Car Crash Conference (P-337). Warrendale, PA: Society of Automotive Engineers.
- Insurance Institute for Highway Safety. 2005. Crash-worthiness evaluation side impact crash test protocol (ver. IV). Arlington, VA.
- Side Airbag Out-of-Position Technical Working Group. 2003. Recommended procedures for evaluating occupant injury risk from deploying side airbags.
- Denton Robert A., Inc. 2006. New product announcement: RibEye ATD thorax displacement technology. Rochester Hills, MI.
- National Highway Traffic Safety Administration. 2001. THOR alpha user's manual (ver. 1.1). Washington, DC.