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卧车的舒适度和服务质量受室内噪声和振动的影响很大。1978年10月,为提高服务质量而将卧铺由三层改为二层的14系15型特快卧车投入了新造。从运营情况看,在11、12号卧室内噪声、振动较大,难以睡觉。为此,进行了调查试验。通过采取一些暂定措施(图1),噪声减少了10分贝(A)。但由于进风口设在车下柴油机侧,因而受到柴油机辐射热的影响,并易吸入灰尘等。
The comfort and service quality of the sleeping car are greatly affected by the noise and vibration in the room. October 1978, in order to improve service quality will be sleeper from the third floor to the second floor of the 14 Series 15 Express sleeper into a new. From the operating conditions, in the 11,12 bedroom noise, vibration, difficult to sleep. To this end, conducted a survey test. By taking some tentative measures (Figure 1), noise is reduced by 10 dB (A). However, due to the inlet located under the car side of the diesel engine, which is subject to the radiant heat of diesel engines, and easy to inhale dust.