A great number of factors affect the uncomfortable of seats. Apart from external appearance, the most important is the comfort for users in designing an un-adjustable seat. A system or suggested principles which assist designers in designing the comfort of the seats to testees will benefit waist of users, and hence prevent them from potential discomfort and injuries. This study attempts to develop digital design platforms, and allows designers to measure the design scale of the comfort. We expect to find the association between seat parameter interaction and comfort. For example, when the seat height is much lower than the knee of testees, they can stretch calf forward if the space allows, so that their thighs contact the surface of the seat to share sciatic pressure in greater comfort. We believe to have changes of comfort in opposition to different seat parameter combinations. The final results will help effective reference parameters of comfort in seat design.
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