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Mechanical-Thermal Simulation of Passenger-Loaded Vehicle Seat in Severe Winter Conditions
Technical Paper
2004-01-1507
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This paper presents a comprehensive steady-state numerical study for an occupant-loaded vehicle seat with internal heating under severe winter conditions. A participant-based postural study showed that the nominal peak occupant seat pressure was 6kPa on the seat cushion, and 2.5kPa on the backrest. Uni-axial compression tests also indicated non-linear stress-strain behaviors in seating. Using an internally developed 3-D numerical model, it was found that the thermal resistance from contact and clothing was uniform (hc=144W·K−1·m−2) throughout the occupied regions. Their contribution to the overall thermal resistance was relatively minor, however, compared to that of skin (hoverall=27.2W·K−1·m−2).
The thermal-mechanical simulations were conducted at heat input levels between 20W and 80W, using I-DEAS 10 and the TMG package as the simulation platform. Comparisons was also made between occupied seat with deflected and non-deflected mesh. The occupant deflection helped reduce the thermal resistance in the occupied region, which resulted in a slight decrease in heater temperature, accompanied by an increase in the average surface temperature, compared to corresponding undeformed results.
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Citation
Chan, E., Karimi, G., Rose, D., and Culham, J., "Mechanical-Thermal Simulation of Passenger-Loaded Vehicle Seat in Severe Winter Conditions," SAE Technical Paper 2004-01-1507, 2004, https://doi.org/10.4271/2004-01-1507.Also In
Heat Exchangers and Their Simulation, Thermal Management, and Fundamental Advances in Thermal and Fluid Sciences
Number: SP-1818; Published: 2004-03-08
Number: SP-1818; Published: 2004-03-08
References
- Thermal properties of tissue. Technical report, Department of atomic physics, Lund institute of technology, Lund, Sweden 2003
- Burch S.D. Ramadhyani S. Pearson J.T. Analysis of passenger thermal comfort in an automobile under severe winter conditions ASHRAE Transactions 98 (1) 247 257 1992
- Cheng P. Heat transfer in geothermal systems Advances in Heat Transfer 20 893 898 1978
- Fanger P.O. Thermal comfort: analysis and applications in environmental engineering McGraw Hill 1972
- Haslam R.A. Parsons K.C. An evaluation of computer-based models that predict human responses to the thermal environment ASHRAE Transactions 94 (1) 1342 1360 1988
- Karimi G. Chan E.C. Culham J.R. Experimental study of thermal modeling of an automobile driver with heated and ventilated seat 2003 SAE Digital Human Modeling Conference number 2003-01-2215 Montréal, Québec 2003
- Karimi G. Chan E.C. Culham J.R. Linjacki I. Brennan L. Thermal ocmfort analysis of an automobile driver with heated and ventilated seat SAE 2002 World Congress Detroit, Michigan 2002 2002-01-0586
- Lotens W.A. Comparison of thermal predictive models for clothed humans ASHRAE Transactions 94 (1) 1321 1341 1988
- Ragan R. Kernozek T.W. Bidar M. Matheson J.W. Seat interface presurs on various thicknesses of foam wheelchair cushions: a finite modeling approach Archives of Physical Medicine and Rehabilitation 83 872 875 2002
- Todd B.A. Smith S.L. Vongpaseuth T. Polyurethane foams: effecs of specimen size when determining cushioning stiffness Journal of Rehabilitation Research and Development 35 (2) 219 224 1998