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本文对铁道部环保示范工程——长沙机务段ＤＦ４型及ＮＤ２型两台位水阻试验台噪声治理工程所采用的大型敞开式隔声库、大型排烟消声器及大型排风消声器及其综合降噪效果进行了理论分析，并给出了噪声治理前后内燃机车水阻试验的噪声测量值。测量及试运行结果表明：该工程既能在无能耗的条件下解决机车水阻试验时的通风散热问题，又能达到国家环保要求。
In this paper, the Ministry of Railways environmental demonstration project - Changsha locomotive depot DF4 and ND2 two water resistance test bed noise control project used in large open soundproof warehouse, large exhaust muffler and large exhaust muffler and its comprehensive The noise effect is analyzed theoretically, and the noise measurement of water resistance test of diesel locomotive before and after noise control is given. The results of measurement and test run show that the project can not only solve the problem of ventilation and heat dissipation during locomotive water resistance test without energy consumption, but also meet the national environmental protection requirements.