Holt J J, Broste S K, Hansen D A
Department of Otolaryngology, Marshfield Clinic, WI 54449.
Laryngoscope. 1993 Mar;103(3):258-62. doi: 10.1288/00005537-199303000-00004.
Noise levels of 155 tractors on 36 farms were studied. The range of noise levels at the driver's ear level with radios off and windows closed (if so equipped) was from 78 to 103 dB. Seventy-five percent of tractors without cabs had noise levels in excess of 90 dB, compared to only 18% of tractors with cabs. The use of a radio adds an average of 3.1 dB of noise. When some cab windows are open and the radio is on, an average of 4.2 dB is added to the cab noise. From the results of this study, the authors recommend hearing protection when time on a tractor with a cab approaches 3 to 4 hours and when time on a tractor without a cab approaches 1.5 to 2 hours. Limited use of the radio is also recommended.
对36个农场的155台拖拉机的噪音水平进行了研究。在收音机关闭且车窗关闭（如果配备）的情况下，驾驶员耳部水平的噪音范围为78至103分贝。75%无驾驶室的拖拉机噪音水平超过90分贝，相比之下有驾驶室的拖拉机只有18%。使用收音机平均会增加3.1分贝的噪音。当驾驶室的一些窗户打开且收音机开着时，驾驶室噪音平均会增加4.2分贝。根据这项研究的结果，作者建议，当在有驾驶室的拖拉机上工作时间接近3至4小时以及在无驾驶室的拖拉机上工作时间接近1.5至2小时时，应佩戴听力保护装置。还建议限制收音机的使用。
