This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Approaches to Modeling the Dynamic Interaction for an Automotive Seat and Occupant System
Technical Paper
2007-01-0988
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
There are a wide variety of approaches to model the automotive seat and occupant interaction. This paper traces the studies conducted for simulating the occupant to seat interaction in frontal and/or rear crash events. Starting with an initial MADYMO model, a MADYMO-LS/DYNA coupled model was developed. Subsequently, a full Finite Element Analysis model using LS/DYNA was studied. The main objective of the studies was to improve the accuracy and efficiency of CAE models for predicting the dummy kinematics and structural deformations at the restraint attachment locations in laboratory tests. The occupant and seat interaction was identified as one of the important factors that needed to be accurately simulated. Quasi-static and dynamic component tests were conducted to obtain the foam properties that were input into the model. Foam specimens and the test setup are discussed. Different material models in LS/DYNA were evaluated for simulating automotive seat foam. Some of the run-time difficulties with using solid elements for the simulation are also addressed. Penetration issues of the dummy to the seat finite element analysis model can be resolved using a settling run or morphing techniques. Additional parameters that could affect simulation results include the dummy positioning, friction between the contact surfaces and seat belt properties. In addition to the cushion, there is compliance from the supporting structure, which includes the seat mat and the springs that connect to the seat frame. The conclusion from these studies is that a full finite element analysis code is best suited for modeling the details of the seat structure and the seat foam material as well as the dummy components. Some level of component testing is required for validating and advancing the prediction capability of CAE models.
Recommended Content
Authors
- Gurunath Vemulakonda - Ford Motor Company
- Ben-Ren Tang - Ford Motor Company
- Raj Jayachandran - Ford Motor Company
- Deborah Wan - Ford Motor Company
- Sarbasubha-Guha Thakurta - Ford Motor Company
- J. Michael Chang - Ford Motor Company
- Tau Tyan - Ford Motor Company
- James Cheng - Ford Motor Company
- Jiamaw Doong - Ford Motor Company
- Len Shaner - Ford Motor Company
- Dilip Bhalsod
Citation
Vemulakonda, G., Tang, B., Jayachandran, R., Wan, D. et al., "Approaches to Modeling the Dynamic Interaction for an Automotive Seat and Occupant System," SAE Technical Paper 2007-01-0988, 2007, https://doi.org/10.4271/2007-01-0988.Also In
Modeling, Testing and Design of Materials for Dummies and Structures for Crash Safety Applications
Number: SP-2095; Published: 2007-04-16
Number: SP-2095; Published: 2007-04-16
SAE 2007 Transactions Journal of Passenger Cars: Mechanical Systems
Number: V116-6; Published: 2008-08-15
Number: V116-6; Published: 2008-08-15
References
- IIHS Status Report 34 5 May 22 1999
- Krafft M. Kullgren A. Tingvall C. Bostrom O. Fredriksson R. “How Crash Severity in Rear Impacts Influences Short- and Long-term Consequences to the Nock” Accid Anal Prev. 32 187 195 2000
- Kim A. Anderson KF at al “A Comparison of the Hybrid III and BioRID II Dummies in Low-Severity Rear-Impact Sled Tests” 45 th Stapp Car Crash Journal 2001
- Viano D. Olsen S. Locke G. S. Humer M. “ Neck Biomechanical Responses With Active Head Restraints: Rear Barrier Test with BioRID and Sled Tests with Hybrid III SAE paper 2002-01-0030
- Lovsund P. Nygren A. Tingvall C. ”Neck Injuries in Rear End Collisions Among Front and Rear Seat Occupants Proc. IRCOBI 319 325 1998
- Panjabi M. Wang J. Delson N. “Neck Injury Criterion Based on Intervertebral Motion and Its Evaluation Using an Instrumented Neck Dummy” IRCOBI Conf 179 190 1999
- Cavender K. D. “Real Time Foam Performance Testing” Journal of Cellular Plastic 29 350 363 1993
- ASTM D3574 Standard Test Methods for Flexible Cellular Materials - Slab, bonded, and Molded Urethane Foams 1995
- Cavender K. D. Kinkelaar M. R. “Real Time Dynamic Comfort and Performance Factors of Polyurethane Foam in Automotive Seating” SAE paper 960509
- White S. W. Kim S. K. Davies P. Bajaj A. K. “Modeling and Measurement of Occupied Car Seats” SAE paper 1999-01-1690
- Chae C. K. Kim K. J. Jang H. K. Cho Y. H. “An Experimental Study on Dynamic Characterization of Polyurethane Foams Employed in Automotive Seating Application ” KSAE paper 2000-03-3033
- Chae C. K. Song S. Kim K. J. Jang H. K. Kim S. H. Cho Y. H. “Dynamic Characterization of Foam Materials and Its Application to Modeling of Automotive Seat-Passenger System” SAE paper 2001-01-1559
- Widdle R., Jr Bajaj A. K. Davies P. “Linking of Continuum and Microstructure Models of Foam to Aid in the Design of Automotive Seating” SAE paper 2004-01-0379
- Sopher S. R. “Advancements in Soft Polyolefin Bead Foams for Automotive Interior Trim Components” SAE paper 2004-01-1716
- Mehta B. V. Petkar P. Williams R. II “Importance of Seat and Head Restraint Positions in Reducing Head-Neck Injuries” SAE paper 2001-01-2659
- Brown D. Gabler H. “Modeling of Commuter Category Aircraft Seats Under Crash Loading” SAE paper 2003-01-3028
- Casati F.M Berthevas P.R. Herrington R.M. Mayazaki Y. “The contribution of Molded Polyurethane Foam Characteristics to Comfort and Durability of Car Seats” SAE Paper No. 1999-01-0585
- McEvoy J.T “Advances in Polyurethane Foam Property Control” SAE paper 2001-01-0325
- LS/DYNA Keyword User's Manual, Version 970 Livermore Software Technology Corporation April 2003