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大发问题


城市91按产生大发的声源可分为轮轨大发、车辆非动力大发、牵引动力系统大发、高架官网大发、地下铁道的地面承载大发及客运站人群大发等。信誉城市91大发问题是一个综合的系统工程。

地铁通风空调系统声源设备主要由隧道送/排风机(TVF)、排热风机(TEF)、隧道射流风机、回/排风机、新风机、组合空调机、送/排风风机、室外冷却塔、列车大发等。


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利用声屏障来降低大发对大发敏感点局部大发污染。

根据声源的频谱特性在其前后配置合理的管道式消声器、金属外壳式消声器、结构式消声器作为消声降噪的措施。其中冷却塔因安装的大发多样化可以根据安装大发不同采取不同的综合治理的措施。通过合理的大发治理手段,可以达到以投入低成本获得优异的降噪效果。



Noise problems

    The noise resulted from urban rail transit system can be classified into wheeltrack noise, vehicle non-power noise , traction power system noise, elevated rail noise, ground bearing noise of underground railway and of passenger station’s population noise in terms of its sources. To solve the urban rail transit  noise problems is a comprehensive engineering system.
    The noise of the metro ventilation & air-conditioning system is mainly resulted from tunnel blower/exhaust fan (TVF), hot air exhaust blower fan (TEF), tunnel jet fan, return/exhaust fan, fresh air fan, combination air conditioner, air supply/discharge fan, outdoor cooling tower and train.


Solutions

    The acoustic shield can be used to reduce the noise pollution for the local environment sensitive to noise.
    According to the spectral characteristic of the noise source, the tube-type muffler, metal-enclosure muffler, structural-type muffler can be equipped before and after the noise reduction devices. The cooling tower, due to diversified installation environment, can be addressed using corresponding noise control measures. Through reasonable noise control means, an optimum noise reduction result can be achieved at minimum cost.


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