Abstract
Sensation of an intermittent vibration such as bullet train vibrations was equ-alized to the sensation of a continuous random vibration which possessed frequency characteristics of 6 dB/oct between 8 and 80 Hz. The values of the intermittent vibration read by the vibration level meter standardized in this country (physical quantity) corresponded to the equal sensation value of the random vibration (sensa-tion quantity). This type of random vibration was able to use as the model of the bullet train vibrations. It was noticed in the experiment of sensation comparison that the longer the length of rest time between the sample train vibration and the compared random vibration was, the lower the equal sensation values became.
Then, emotion caused by this continuous model random vibration was rated in an evaluation scale in 5 steps (scarcely unpleasant, slightly unpleasant and so on). The experiment was carried out on a vibration table and on 10 male subjects. The first step "scarcely unpleasant" corresponded to 65 dBVL (vibration level, rms acceleration levels weighted by frequency characteristic simulated for human vibra-tion response, in dB) the second step "slightly unpleasant" to 80 dBVL and the third step "unpleasant" to 90 dBVL for vertical vibration. For horizontal vibration, the third step corresponded to 92 dBVL. Thus, the emotional response could be estimated from the observed values obtained from the bullet trains.
