機械設計データとして有効な感性評価値の尺度段階および被験者数

概要

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It is necessary to know small but enough number of the subject for obtaining reliable design information from the sensory evaluation in mechanical engineering field. In this study, the sensory evaluation of the optimum diameter easy to grasp cylindrical object was performed and the relationship between the scale division ranks and the number of the subjects was investigated. The numbers of the scale division ranks employed were six, i.e., from 2 to 7, and the one hundred subjects were participated at the sensory evaluation tests. The mean values of the optimum grasping diameter were about 35mm for all division ranks. The distribution pattern of the subjective score of optimum diameter showed same with the kurtosis of 3 and the skewness of 0.3. Necessary time for the evaluation of the optimum diameter was increased with the scale division rank, but in the case of the scale division ranks over 4, the time necessary for enough high accuracy of the evaluation was the certain amount time. It was revealed that the numbers of the subjects needed for the evaluation with high accuracy were over 20 by using the ranks over 4 and over 10 by using the ranks over 6 and 7 division rank.