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Vehicles modified with a wheelchair transporting apparatus are generally used for improving wheelchair users'' mobility. However, in designing the apparatus, consideration for passengers'' discomfort and fatigue is not sufficient. As a countermeasure of this problem, both vibration characteristics of the passenger-wheelchair system and passengers'' sensitivity need to be studied. In previous study, authors constructed a vibration simulation model to predict vibration on passengers'' body from floor vibration. This study aims to clarify the relationship between vibration and comfort, and to propose a method to support designing WTA by the findings of this study. First, we carried out a vibration experiment with a vibration generator that vibrated the passenger-wheelchair system and measured floor vibration, vibration on the human body, and subjective evaluation. Second, we discussed experimental results.

Against discomfort of vehicles for wheelchair users, countermeasures such as a vibration absorber are required. To determine the optimal characteristics of the absorber, we had proposed the Comfort Evaluation Prediction System (CEPS) that can predict subjective evaluation from floor vibration, considering passengers' constitutions and wheelchair types. The purpose of this paper is to construct a model that simulates the vibration transmited to the passenger as part of the CEPS. We modeled a wheelchair-bound passenger and estimated unknown parameters by the result of a modal experiment. Then some simulations were carried out to suggest applicability of the model.