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在美国,目前用于干线铁路牵引和调车作业的电力传动内燃机车共有27000多台。其中很多机车在最大功率工况下,在相距线路30.5米处的噪声值达93分贝,在空转工况下达73分贝。美国环保局现巳颁布了若干标准。标准规定新造机车在最大功率和空转时的噪声值必须分别降至87分贝和70分贝。这一规定的实行促使人们极大地关注电力传动内燃机车的噪声
In the United States, there are currently more than 27,000 electric drive diesel locomotives used for traction and shunting of trunk railways. Many of these locomotives have a noise level of 93 dB at 30.5 m from the line at maximum power and 73 dB at idle. The U.S. Environmental Protection Agency has now promulgated certain standards. The standard stipulates that the noise of new locomotives at maximum power and idling must be reduced to 87 dB and 70 dB, respectively. The implementation of this regulation has prompted great attention to the noise of electric drive diesel locomotives