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Validity of Comfort Assessment in RAMSIS
Technical Paper
1999-01-1900
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This paper describes the validation of the Comfort Assessment function of RAMSIS performed at Saab Automobile AB. The purpose was to find out if the effects of a change in design on comfort can be predicted by RAMSIS.
An interior mock-up of a car was used, in which seat, steering wheel, accelerator pedal, brake pedal and clutch pedal could be adjusted independently. In this mock-up 21 test subjects (10 men, 11 women) were told to adjust the steering wheel and the seat in the way that they obtained a good driving position. Pedals were fixed at a pre-defined position. The test subjects were told to judge the discomfort of the driving position on a scale from 1 to 10 with 1 meaning “not at all comfortable” and 10 meaning “very comfortable”. Then the test subjects were told to adjust the pedals and seat to improve the driving position, and asked to judge the discomfort of the new driving position. The seat, steering wheel and pedal positions were recorded for the two driving positions. Also, some anthropometric key dimensions were measured.
A CAD model of the interior mock-up was created and transferred to RAMSIS. The anthropometric measures of the 21 test subjects were used to create RAMSIS manikins corresponding to each test subject. The manikins were positioned in the previously recorded seating position with the pre-defined pedal position. A task defining which points on the manikin should touch which surfaces in the model was created so that the manikin was positioned in a driving position. RAMSIS was used to calculate the comfort values. The pedals were repositioned according to the individual pedal arrangement for each manikin and the manikin was repositioned to the second driving position. The same task was used to calculate a new driving position, and the comfort values were calculated.
For three manikins RAMSIS determined a worse comfort rating in the second driving position while the test subject specified a better comfort rating. In ten cases RAMSIS predicted a better comfort while also the test subjects rated the driving position as better. In the rest of the cases either RAMSIS predicted a better comfort while the test subject did not find the second driving position better (but not worse) or vice versa.
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Citation
Nilsson, G., "Validity of Comfort Assessment in RAMSIS," SAE Technical Paper 1999-01-1900, 1999, https://doi.org/10.4271/1999-01-1900.Also In
References
- Rothwell, P.L. Hickey, D.T. 1986 Three-dimensional Computer Models of Man. Proceedings of the Human Factors Society 30th Annual Meeting, 216 220 Dayton, Ohio
- Nilsson, G. 1994 On Development of Tools for Ergonomic Simulation and Evaluation in a Computerized Environment, Licentiate thesis, Chalmers University of Technology, Gothenburg, Sweden
- Eriksson, J. 1994 Computer Aided Planning of Environment Adaptation for Physically Disabled, Licentiate thesis, Lund Institute of Technology, Lund University, Lund, Sweden
- Porter, J.M. Case, K. Freer, M.T Bonney, M.C. 1993 Computer-aided ergonomics design of automobiles, Peacock B. Karwowski W. Automotive Ergonomics 43 77 Taylor & Francis London
- Loczi, J. Dietz, M. Nilsson, G. 1999 Validation and Application of the 3-D CAD Manikin RAMSIS in Automotive Design, SAE paper 99B-172