Abstract
Supporting stiffness of the seat is one of the important components affecting dynamic characteristics recognized by a passenger. To analyze dynamic characteristic of seat for vehicles operating on various road conditions, the seat should be understood together with the oscillation due to road irregularity. In this study, the viscoelastic properties of flexible polyurethane foam under compression was measured and used in estimating the dynamic characteristic of seat analyzed as a simplified geometry. The beam transfer function method is used to obtain the dynamic properties of the foam under compression. The viscoelastic properties were obtained to the maximum compression level of 70%. The simple seat model was composed rigid base, edge blocks, elastic supports, and flexible polyurethane foam, and the method is used in the same way to obtain the dynamic support properties. The equivalent support stiffness was estimated on various locations on the seat, and the effects of each component such as the compression level, the foam type, and the stretch of elastic support were analyzed.
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