心地よいと感じる揺れに関する基礎研究 : 加速度波形の包絡線に関する周波数分析(機器の音質・振動評価技術,ワークショップ「低周波音に関する最新技術」,振動・騒音改善技術)

抄録

The purpose of this study is to examine the condition of "comfortable swinging". The swinging of the low frequency seems to be sensed in the semicircular canals which sense the posture. Therefore, an equipment is developed for measuring the three-axial acceleration on the ear where is near the semicircular canals. Then, acceleration on the ear of person swung by the active swing chair realizing the comfortable swing and by the active rocking chair changing the driving force with heartbeat fluctuation is measured. It is clarified that the power spectrum of the envelope of acceleration waveform shows the relationship of "1/f". Next, the acceleration on the ear of person riding a pickup truck with hard suspension, comfortable car with soft suspension and comfortable limited express train is measured. The deference between the power spectrum of the envelope of acceleration sensed comfortable and one sensed uncomfortable is clarified.