Volunteer tests on human tolerance levels of pretension for reversible seatbelt tensioners in the pre-crash-phase phase I results: tests using a stationary vehicle

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Lorenz, Bernd¹; Kallieris, Dimitrios¹; Strohbeck-Kuehner, Peter¹; Mattern, Rainer¹; Class, Uwe²; Lueders, Michael²

Volunteer tests on human tolerance levels of pretension for reversible seatbelt tensioners in the pre-crash-phase phase I results: tests using a stationary vehicle

Proceedings of the 2001 International IRCOBI Conference on the Biomechanics of Impact

Affiliations

¹Institute of Legal and Traffic Medicine, University of Heidelberg, Germany

²TRW Occupant Safety Systems, Alfdorf, Germany
Abstract and keywords

It is the aim of this current study to define the maximum force of seatbelt pretension in the precrash-phase tolerable for a car passenger. This is attempted by volunteer tests using a car fitted with a prototype of a reversible system for belt pretension. The volunteers (14 f, 10 m, aged 16 to 73) represent a broad spectrum of car-users.

Up to now 64 tests were conducted in a stationary vehicle to determine the tolerable strain especially under Out of Position (OOP) conditions.

The head acceleration measured through accelerometers which were mounted on individually fitted dental adapters, was rather low in all tests with some increase for the OOP-experiments (amax= 2,9 g).

Belt forces were 0,16 kN < FBmax < 0,29 kN.

Under the present test set up and conditions, the loadings were assessed by the test persons as tolerable and acceptable. In general, the belt forces measured with shorter and lightweight persons were higher than those measured with tall and heavier persons. This can be improved by a special algorithm e.g. in connection with a weight-sensor in the car seat so as to better adapt the system to the anthropometric parameters of the occupant.

Keywords: reversible seatbelt tensioner; safety belts; volunteers; tolerances; soft tissue

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Cited By (6)

Year	Entry
2015	Jakobsson L, Axelson A, Björklund M, Nilsson P, Victor T. Run off road safety. In: Proceedings of the 24th International Technical Conference on the Enhanced Safety of Vehicles (ESV). June 8-11, 2015; Gothenburg, Sweden.
2007	Good C, Viano D, McPhee J, Ronsky J. Modeling biomechanics of volunteers subject to loading by a motorized shoulder belt tensioner. In: Proceedings of the 2007 International IRCOBI Conference on the Biomechanics of Impact. September 19-21, 2007; Maastricht, The Netherlands.381-384.
2015	Jakobsson L, Lindman M, Björklund M, Victor T. Rear‐end impact: crash prevention and occupant protection. In: Proceedings of the 2015 International IRCOBI Conference on the Biomechanics of Injury. September 9-11, 2015; Lyon, France.803-813.
2021	Jakobsson L, Östh J, Bohman K. Rear-end impact assessment expanded with pre-impact posture variations. In: Proceedings of the 2021 International IRCOBI Conference on the Biomechanics of Injury. September 8-10, 2021; Online.753-770.
2013	Develet J-A, Carlsson A, Svensson M, Fredriksson R, Bråse D, Holcombe S. Evaluation of the biofidelity of the BioRID-II and THOR-NT anthropomorphic test devices under seatbelt pre-pretensioner loading in stationary conditions. In: Proceedings of the 9th Ohio State University Injury Biomechanics Symposium. May 19-21, 2013; Columbus, OH.
2007	Good CA. Biomechanics of Occupant Loading by Pre-Crash Motorized Shoulder Belt Tensioning [PhD thesis]. Calgary, AB: University of Calgary; 2007.