噪声已成为当前引入注目的问题。从1973年起,日本国营铁路就开始重视这一问题,并和制造厂家一起,着手研究内燃机车的防止噪声和降低噪声的措施。关于柴油机的机械噪声,主要采取复盖柴油机的办法;对排气噪声,则加装消声器;为了大幅度降低冷却风扇的噪声,则放弃轴流式 Noise has become the current focus of attention. Since 1973, the state-owned railway in Japan has begun to attach importance to this issue and, together with the manufacturers, started to study measures to prevent noise and reduce noise in diesel locomotives. On the mechanical noise of diesel engines, the main way to cover the diesel engine; exhaust noise, the installation of muffler; in order to significantly reduce the cooling fan noise, then give up axial flow