EVALUATION METHODS FOR VIBRATION EFFECT
EVALUATION METHODS FOR VIBRATION EFFECT
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DOI：
10.2486/indhealth.5.183
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发表时间：
1968
影响因子：
2
通讯作者：
T. Miwa
中科院分区：
文献类型：
--
作者：
T. Miwa
连续正弦振动的感知和情绪反应主要表现为振动剧烈和不愉快或难以忍受的感觉。本文通过与连续正弦振动的比较，得到了脉冲正弦振动、阻尼振动和累积振动三种脉冲的振动强度。选择连续正弦振动的频率与每个脉冲的基频相同。对10名男性受试者进行直立坐姿，在垂直方向和水平方向进行全身振动，在垂直方向进行手部振动。脉冲正弦振动的持续时间和基频分别在0.005至6秒和2-300 Hz之间变化，但其水平保持不变。脉冲正弦波的振动强度随其持续时间的增加而增加，在2至60 Hz的频率范围内约为2秒。增加的速率可以用斜率为7 dB / 10年的直线来近似表示。通过基频前一周期的峰间幅值和持续时间来评价阻尼振动的振动强度。通过最大峰幅值以下1.5 dB处的最大峰幅值、基频值和持续时间来判断组合振动的振动强度。还测量了脉冲正弦波的感知阈值，可以用与振动强度（7 dB / 10年持续时间）具有相同斜率的直线近似表示。
Perceptional and emotional responses on continuous sinusoidal vibrations characteriz-ed as vibration greatness and unpleasant or unbearable feeling were reported in the pre-vious papers.In this paper, the vibration greatness of three kinds of pulses such as pulsed sinusoidal, damped and built-up vibrations is obtained in comparison with a continuous sinusoidal vibration. The frequency of the continuous sinusoidal vibration is selected to be the same as the fundamental frequency of each pulse. Ten male subjects sitting erect are given the whole body vibration in vertical and horizontal directions and the hand vibration in vertical direction.Durations and fundamental frequencies of the pulsed sinusoidal vibrations are changed between 0.005 and 6 sec, and 2-300 Hz respectively, but their level is maintained constant. The vibration greatness of the pulsed sine waves increases with their dura-tion up to approximately 2 sec in the frequecy range between 2 and 60 Hz. The rate of the increase can be approximated by the straight line with the slope of 7 dB / decade of duration.The vibration greatness of the damped vibration can be evaluated by peak-to-peak amplitude and duration of initial one period of its fundamental frequency.The vibration greatness of the built-up vibration can be estimated by its maximum peak-to-peak amplitude, fundamental frequency and duration corresponding to the am-plitude 1.5 dB below the maximum peak-to-peak amplitude.The perceptional threshold for the pulsed sinusoidal waves is also measured and can be approximated by the line with the same slope as that of the vibration greatness (7 dB / decade of duration).