DETERMINATION OF THE POLYURETHANE PARAMETERS FOR RIDING COMFORT EVALUATION IN AUTOMOBILE SEATING APPLICATION 2019-01-0931
Riding comfort for automobile seating can be basically classified in two categories, long time riding comfort and short term riding comfort. The two main attributes that govern the riding comfort are static spring constant and energy lost due to hysteresis. The emerging trend towards long term riding comfort could be governed by the above mentioned factors.
The energy lost due to hysteresis and the nature of the loss could be controlled by the nature of the PU foam via its material and hardness. The nature with which the energy is released considering the same material and varying the hardness directly contributes to the comfort analysis for automobile seating and vice versa. Two curves can define a same area but the loading and unloading trend for the two cases could be different and so be the riding comfort. A conclusion would be drawn by obtaining hysteresis loss rate by playing with different parameters (hardness, density). One parameter would be varied by keeping the others constant. The data presented will show the difference in comfort by variation of hardness and density of an automobile seat. Hysteresis loss rate graph would be obtained for all the seating combination via physical testing of the seats.