Heavy Truck Seat Belt Restraint FE Simulations
•
1 like•1,268 views
Breakout Session 7: Integrated Solutions for Transportation Safety – ATLAS Center Projects 2015 Traffic Safety Conference by Chiara Silvestri-Dobrovolny, Associate Research Scientist, Texas A&M Transportation Institute
Recommended
More Related Content
What's hot
What's hot (20)
Similar to Heavy Truck Seat Belt Restraint FE Simulations
Similar to Heavy Truck Seat Belt Restraint FE Simulations (20)
More from Texas A&M Transportation Institute
More from Texas A&M Transportation Institute (20)
Recently uploaded
Recently uploaded (17)
Heavy Truck Seat Belt Restraint FE Simulations
- 1. Use of FE Simulations to Parametrically Evaluate and Compare Seat Belt Restraint Systems and Related Injury Risk in Heavy Truck Frontal Crash Conditions 2015 Traffic Safety Conference Corpus Christi, Texas June 09, 2015 Chiara Silvestri Dobrovolny, Ph.D. Associate Research Scientist, TTI Nathan Schulz Graduate Research Assistant, TTI
- 2. Order of Presentation Background Objective Methodology FE Computer Models (Vehicle, ATD, Passive Restraint Systems) FE Computer Frontal Impact Simulations Results Future Research
- 3. Background Approximately 340,000 medium/heavy trucks involved in traffic crashes per year in U.S. 600 fatalities; 20,000 injuries to truck drivers Aggregate cost of crashes to society is $3.1 billion No existing standards for truck cab crashworthiness or occupant protection in heavy truck crashes (although being discussed) Need of additional characterization of crash-injury, current heavy truck crashworthiness, potential benefits of crashworthy structures in heavy truck cabs
- 4. Objectives TTI and UMTRI proposed jointly effort devoted to collect & develop required information by: analyzing crash & travel datasets available at UMTRI and TTI; identify frequencies & costs of types of heavy truck crashes; estimate benefits of crashworthy structures in heavy trucks to reduce death, injury, & societal costs of heavy truck crashes
- 5. Methodology
- 6. FE Computer Models Methodology – Big Picture Heavy Truck ATD Seatbelt Airbag FE Computer Simulations Frontal Impact (Wall) Parametric Variation Seatbelt Properties ATD Injury Criteria + + +
- 7. Simplified Methodology Crash pulse applied to cab mounts Frontal Impact (Wall) ATD Seatbelt Airbag + ++
- 8. Step 1 Develop Heavy Truck Cabin Model
- 9. Current FE Computer Model ? Computer Model – Heavy Truck Need for Occupant Compartment Interior
- 10. Heavy Truck Cabin Model FE Model of Cab-Over-Engine Cabin* * Developed by TTI under project funded by Department of State Morphed Conventional Cab* * As of Peterbilt 387
- 11. Step 2 Develop Heavy Truck Interior Compartment
- 12. Heavy Truck Interior Compartment Cloud Point Scans* * Developed by UMTRI for Peterbilt 387
- 13. Heavy Truck Interior Compartment Models developed applying mesh grid over cloud points
- 14. Step 3 Inclusion of ATD
- 15. ATD Inclusion and Pre-Positioning Existing LSTC Hybrid III 50% Male ATD
- 16. Step 4 Addition of Passive Restraint Systems
- 17. Seatbelt Model Original *Developed by LSTC for Passenger Car Modified *To fit Heavy Truck Geometry Original Modified
- 18. Seatbelt Model Modified *To fit Heavy Truck Geometry
- 19. Airbag Model Airbag - *Developed by NCAC Folded Deployed NCAC Heavy Truck
- 21. Crash Pulse – 35 mph Frontal
- 22. Step 6 FE Parametric Simulations of Frontal Impacts
- 23. Frontal Impacts – 35 mph Baseline No Pretensioner 4 kN Load Limiter 8 kN Load Limiter Lowered D-Ring
- 24. Step 7 ATD Injury Criteria Evaluation
- 26. ATD Injury Criteria Head Injury Criteria (HIC) Head acceleration recorded during impact event employed to calculate HIC representing probability of head injury
- 28. Comparison to IARV Body Region Parameter IARV Injury Criteria % of Critical Value Head HIC 700 104 0.15 Neck Nij 1 0.78 0.78 Neck axial tension(kN) 4.17 2.8 0.68 Chest Deflection (mm) 63 85 1.36 Lower Extremity Femur axial force(kN) -10 -4.7 0.47 Tibia Index 1 2.3 2.26 Tibia axial force(kN) -8 -9.3 1.16 Injury Assessment Reference Values (IARVs) Injury event termed “unlikely” if associated injury value does not exceed IARVs
- 31. Frontal Simulations – No Airbag No Airbag - Baseline No Airbag – No Pretensioner
- 32. Frontal Simulations – No Airbag No Airbag – 4 kN Limit Load No Airbag – Lowered D-Ring
- 33. No Airbag – Injury Probability Head Chest Neck
- 35. Head Injury Probability No Airbag Airbag
- 36. Neck Injury Probability No Airbag Airbag
- 37. Conclusions 35 mph w/OUT airbag and 8 kN load limiter produced lowest injury criteria results for ATD. 35 mph w/airbag and 4 kN load limiter produced lowest injury criteria results for ATD. Inclusion of airbag resulted in significant reduction in probability of neck injury
- 38. Future Research Validation of interior component material modelling (for accurate deformation response of truck cabin interior) Realistic seat characteristics (suspensions) Development and analysis of additional restraint systems side curtain airbag system five point seatbelt …
- 39. Acknowledgements Robert Wunderlich (Associate Director, ATLAS Center, TTI) for sponsoring the project through ATLAS Center Program. DOS for use of COE truck cabin FE model developed by TTI. Jingwen Hu (Associate Research Scientist, UMTRI) for seatbelt model and assistance with FE computer simulations. Akram Abu-Odeh (Research Scientist, TTI) and Kimberley Ryan (Former Graduate Student Worker, TTI) for assistance with TruckSim. Abhinav Mohanakrishnan (Former Graduate Student Worker, TTI) for compilation of injury criteria results.
- 40. Questions? Chiara Silvestri Dobrovolny E-mail: c-silvestri@ttimail.tamu.edu Phone: 979-845-8971