When the driver sits on the seat, the cushion supports more than 70% of body weight. Based on this the driver feels discomfort due to the pain and numbness caused by body pressure concentration in the ischial tuberosity. So, the purpose of this study is to analyze the stiffness of the seat cushion according to sitting strategy and to obtain basic data that can be reflected in the design of the seat cushion pad. First, the static stiffness characteristics of the seat cushion pad were determined through a static load test. Next, we measured the body pressure distribution of 20 subjects. Based on this, we derived 7 types of average body pressure distribution. And as the hardness distribution of the seat cushion, it was judged that it would be less hard feeling at the pressure concentration region. Finally, we compared the deflection and stiffness of the seat cushion using the average body pressure distribution and the static stiffness data of the seat cushion.

The users who use the wheelchair are confined to a wheelchair for a long time. Accordingly, the use of seat cushion for pressure distribution is very important in order to prevent a bedsore. Therefore, this paper provides useful information for design of seat cushion through statistical testing among nothing cushion, low cell type of air cushion, high cell type of air cushion, and jelly type of air cushion. It turned out that the jelly type and high cell type of air cushion have a serious effect on decision and design of seat cushion.