This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Potential Improvements to Impact Responses of the Flexible Legform Impactor
Technical Paper
2014-01-0520
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
The validity of evaluating FlexPLI peak injury measures has been shown by the correlation of the peak measures between a human FE model and a FlexPLI FE model. However, comparisons of tibia bending moment time histories (BMTHs) between these models show that the FlexPLI model exhibits a higher degree of oscillatory behavior than the human model.
The goal of this study was to identify potential improvements to the FlexPLI such that the legform provides more biofidelic tibia BMTHs at the normal standing height. Impact simulations using a human FE model and a FlexPLI FE model were conducted against simplified vehicle models to compare tibia BMTHs. The same series of impact simulations were conducted using the FlexPLI models that incorporated potential measures to identify measures effective for further enhancement of the biofidelity. An additional analysis was also conducted to investigate the key factor for minimizing the oscillation of the tibia BMTH.
The results of this study showed that the change of the mass distribution between the bony and flesh parts, along with the addition of the mass compensating for the upper body, provide more biofidelic FlexPLI tibia BMTHs, when used at the normal standing height. It was also found from the additional analysis that the primary factor for the oscillation of the tibia BMTH is the natural frequency of the skin/flesh part, rather than its damping characteristics.
Recommended Content
Citation
Takahashi, Y. and Ikeda, M., "Potential Improvements to Impact Responses of the Flexible Legform Impactor," SAE Technical Paper 2014-01-0520, 2014, https://doi.org/10.4271/2014-01-0520.Also In
References
- Konosu , A. , Issiki , T. , Tanahashi , M. , Suzuki , H. Development of a Flexible Pedestrian Legform Impactor Type GT (Flex-GT) Proceedings of 20 th ESV Conference, Paper Number 07-0178 2007
- Japan Automobile Manufacturers Association and Japan Automobile Research Institute Development of a FE Flex-GTR-prototype Model and Analysis of the Correlation between the Flex-GTR-prototype and Human Lower Limb Outputs using Computer Simulation Models 8 th FlexPLI Technical Evaluation Group (Flex-TEG) Meeting Document, Document Number TEG-096 2009
- Takahashi , Y. , Ikeda , M. , Imaizumi , I. , Kikuchi , Y. et al. Validation of Pedestrian Lower Limb Injury Assessment using Subsystem Impactors Proceedings of IRCOBI Conference 304 315 2012
- United Nations Fourth progress report for Phase 2 of gtr No. 9 (Pedestrian safety) Document Number ECE/TRANS/WP.29/2013/129 2013
- OICA Proposal for Procedure to Process FlexPLI Measurements in Rebound Phase Document of 5 th meeting of the Informal Group on Phase-2 of UN GTR No.9, Document Number GTR9-5-08 2012
- Takahashi , Y. , Ikeda , M. , Imaizumi , I. , Kikuchi , Y. et al. Validation of Pedestrian Lower Limb Injury Assessment using Subsystem Impactors Proceedings of IRCOBI Conference 304 315 2012
- Japan Automobile Manufacturers Association and Japan Automobile Research Institute Flex-GT Full Calibration Test Procedures 5 th Flex-TEG Meeting Document, Document Number TEG-047 2007
- United Nations Global technical regulation No. 9 (Pedestrian Safety) - Phase-2 of the global technical regulation, Proposal for Amendment 2 Document Number ECE/TRANS/WP.29/GRSP/2011/13 2011
- Konosu , A. , Issiki , T. , Takahashi , Y. Evaluation of the Validity of the Tibia Fracture Assessment using the Upper Tibia Acceleration Employed in the TRL Legform Impactor Proceedings of IRCOBI Conference 251 267 2009
- Takahashi , Y. , Kikuchi , Y. Biofidelity of Test Devices and Validity Criteria for Evaluating Knee Injuries to Pedestrians Proceedings of 17th ESV Conference, Paper Number 373 2001
- Gayzik , F. Completion of Phase I Development of the Global Human Body Models Consortium Mid-Sized Male Full Body Finite Element Model SAE International Government Industry Meeting Jan. 2012 https://www.ghbmc.com/GHBMCStatus.pdf