detection of perception threshold of horizontal vibration caused by wind load in a condition approximating a living environment and its performance assessment

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The past studies on perception threshold of horizontal vibration were based on the results of experiments in a condition different from the actual life environment. In this study, vibration tests to subjects in a condition approximating a living environment, and its purpose is to investigate evaluation of perception threshold of horizontal vibration suitable for daily life.This study focuses on subjects' situation and visual sensation as they influence their perception threshold of horizontal vibration. In the case where the subjects are expecting the vibration, they can perceive smaller acceleration vibrations. However, in the case where the subjects are not expecting the vibration and are relaxed by television etc., the perception threshold becomes higher. As a comparison of the past experimental results, the subjects' consciousness of vibration has the most influence on the perception threshold, and that depends on the methods of evaluating the perception threshold.And results of questionnaires show that visual and auditory sensation influence perception threshold. So experiments have been carried out to determine the sense of horizontal vibration where subjects can see the view from a window. The visual situation has the greatest influence on vibration perception, and this is closely connected with vibration amplitude. Vibrations can not be perceived physically in the low frequency and small acceleration range, but they can be recognized visually as movement of the view. Therefore, many subjects can perceive vibrations when they can see the view.From the results, the investigators evaluate perception thresholds of horizontal vibration in consideration of circumferential factors and rank them relative to the past guidelines.