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Extraction of high contributing sound of Air Handling Unit and noise reduction using transfer path analysis

机译：传输路径分析提取空气处理单元的高贡献声和降噪

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Air handling unit (AHU) is generally built in a machine room of a building and controls the temperature in multiple office spaces. The motors of AHU generate sound and vibration and have a possibility to cause noise problem in office. Accordingly, it is necessary to extract high contributing part of the AHU and apply intensive countermeasures to the part quickly. In this study, we attempted to reduce the noise by applying the operational TPA to the simple AHU model. In the test, the radiated sound in front of the model was recorded and the frequency band which increased the overall noise level was extracted. In addition, operational TPA was applied to find out the main contributor to the radiated noise. As the result, the noise at 200 Hz band was large and the motor radiated noise was found to be the main contributor. Furthermore, the noise was increased in the unit case by the cavity resonance. Then, the inside volume of the AHU was separated using a plastic plate for the reduction of the motor noise in the unit. The result showed that the unit radiated noise at the frequency band could be decreased well.
机译：空气处理单元（AHU）通常内置于建筑物的机室，并控制多个办公空间中的温度。 AHU的电动机产生声音和振动，并有可能在办公室引起噪声问题。因此，有必要提取AHU的高贡献部分，并快速将密集的对策应用于部分。在这项研究中，我们试图通过将运营TPA应用于简单的AHU模型来降低噪声。在测试中，记录模型前面的辐射声，并提取增加整体噪声水平的频带。此外，应用操作TPA以找出辐射噪声的主要贡献者。结果，200 Hz带的噪声大，并且发现电机辐射噪声是主要的贡献者。此外，腔谐振在单位壳体中增加了噪声。然后，使用塑料板分离AHU的内部体积，以减少装置中的电动机噪声。结果表明，频带处的单元辐射噪声可以很好地降低。

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