Abstract
The function of artifacts depends on Ba. Ba is defined as elements of human, artifacts and surroundings and the relationships between each of these elements. The different relationship generates the differences in function of artifacts.
Generally, artifacts are used in diverse Ba. But many artifacts are designed under average Ba at present. Therefore, this diversity of Ba results in low evaluation of artifacts under particular human or surroundings.
In order to solve this problem, the objective of the present study is to construct a method for stable evaluation under diverse Ba. First, a method of robust design was proposed. Using objective function including average and variance, the proposed design method can adapt to diverse Ba and features modeling Ba and simulation using Ba model.
Secondly use of this method was confirmed by application for the railway vehicle swing-seat design. Swing-seat has a function, which prevents hip sliding by increasing cushion angle as seat back tilts. In the present study, the diversity of sitting postures and differences in physical constitutions were defined as noise factors. Optimizing design solution (relationships between back angle and cushion angle) for the object variables (hip-sliding force) was attempted. The simulation using Ba model, which was constructed as a dynamic model of human body and seat, was performed.
As a result, optimum relationships between back angle and cushion angle were obtained using the proposed method. It was proved that the proposed design method for diversity of Ba could be useful.
