论文部分内容阅读
对北京市内公共汽车噪声及全身振动进行了测定，并对公共汽车女司乘人员进行工时测定和生育机能调查。结果表明，公共汽车行驶中车厢内噪声为中等强度，噪声范围７２．０～８６．５ｄＢ（Ａ），全身振动强度，司机及乘务员座椅处垂直振动加速度超过了ＩＳＯ２６３１规定的疲劳－减效界限，但未超过４小时暴露极限，水平方向振动均不超标。女司乘人员平均每日实际接触全身振动５小时。回顾性调查表明，女司乘人员接触全身振动１年以上，月经异常发生率显著高于对照组，其中周期异常及重度痛经发生率均高于对照组；女司乘人员自然流产发生率高于对照组，但差异无显著性。
The noise and whole body vibration of bus in Beijing were measured, and the bus crew and crew members were surveyed for working hours and fertility. The results show that the noise in the bus is medium intensity, the noise range is 72.0 ~ 86.5dB (A), the whole body vibration intensity, the vertical vibration acceleration of driver and flight attendant seat exceed the fatigue-reduction limit of ISO2631 , But not more than 4 hours exposure limit, horizontal vibration are not exceeded. On average, the female staff members actually vibrate through the whole body for 5 hours daily. Retrospective survey showed that the female staff members exposed to systemic vibration more than 1 year, the incidence of menstrual abnormalities was significantly higher than the control group, of which cycle abnormalities and the incidence of severe dysmenorrhea were higher than the control group; female staff multiplication occurred more spontaneous abortion Control group, but the difference was not significant.