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• W1276394440 abstract "Pre-pretensioner (PPT) seatbelts are equipped with an electrical pretensioner thattightens the belt in safety critical situations and liberates some webbing if the driver isable to avoid the hazard. These PPT seatbelts introduce new loading scenarios, posinga requirement to evaluate the biofidelity of present-day Anthropometric Test Devices(ATDs). This study evaluates the biofidelity of ATDs of different sizes in four predefinedpositions under PPT seatbelt loading also considering the habituation effect.Data from 5th and 50th percentile females, and 95th percentile male volunteers and theircorresponding ATDs- Hybrid III 5th and 95th percentile dummies, and a prototypeBioRID 50 percentile female dummy were analyzed. Evaluation of the biofidelity wasdone by comparing the responses of volunteers and ATDs. Basic kinematics parameters were tracked with TEMA3.5-012 software and the seatbelt force, currentand voltage signals were obtained from the transducer. Corridors were generated withthe volunteer subjects’ mean response ±1 standard deviation. Hybrid III family doesnot reproduce human-like motion of the head-neck complex under PPT loading due tothe stiffness of the neck and torso. The 50thpercentile female BioRID dummy showsa reversed trend compared to the flexion-extension motion of the volunteers. Changesin stiffness and damping properties may lead to improvements in biofidelity of thesedummies under low load conditions (PPT loading). In general, the small femalevolunteers are observed to have larger head-neck rotation amplitudes, which maycontribute to higher whiplash risk in females. Large male volunteers show lowerbackset reduction and low T1 kinematics compared to other sizes of volunteers. Somevolunteers exhibit limited range of head-neck motion compared to others, which maybe a result of neck muscle tension.Current studies about PPT seatbelts suggest that there is a scope to develop morepowerful systems that may use higher forces to reposition the occupant before animpact. This study identifies injury assessment reference values for neck injuries andoptimal force values for PPT development. Dynamic and static tests were conductedwith H-III6C and the BioRID50F prototype. Two safe crash pulses, one with amaximum deceleration of 4g at56msandadeltaVof9km/hand another with amean acceleration of 6g and a delta V of 28km/h were used in child and adult ATDsrespectively. Neck injury assessment reference values(NICprotraction and NIJ)wereobtained from the dynamic tests and literature review. In static tests, neck injurycriteria for higher seatbelt forces were obtained to compare them with the previousthresholds.Forcescloseto600Nmightbe critical in children when seated slightlyleaning forward. Some test results were discarded due to technical limitations, hencefor future testing it is recommended to use sensors and data acquisition systemsaccordingtothelowloadingscenario." @default.
• W1276394440 created "2016-06-24" @default.
• W1276394440 creator A5059480540 @default.
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• W1276394440 date "2015-01-01" @default.
• W1276394440 modified "2023-09-26" @default.
• W1276394440 title "Evaluating biofidelity of Anthropometric Test Devices under the use of Pre-Pretensioners - Evaluation of future Pre-Pretensioner system with respect to injury levels" @default.
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