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Abstract
An experimental set up was fabricated to measure the pressure distribution on the seat pan and back-rest of a tractor seat. Experiments were conducted with four different seat pans having radius of curvatures of 60, 75, 90 and cm, four backrests with radius of curvatures of 30, 60, 90 and cm, and three back-rest inclinations of 0°, 5° and 10° on representative Indian tractor operators. The subjective assessment of perceived comfort at the seat-operator interface was also recorded. Experiments were conducted in a randomized block design and the data obtained were analysed using suitable computer packages. Results indicate that all the parameters, namely seat pan, back-rest profile curvatures and the back-rest angle of inclination, affect the pressure distribution. It is concluded that a seat pan with radius of curvature 75cm, back-rest with radius of curvature 30 cm and back-rest inclination of 10° are the most suitable parameters for Indian tractor operators.