摘要：With the development of science and technology and the continuous improvement of people’s living standard,central air conditioning system has been widely used in puclic buildings(e.g.,shopping malls,office buildings,hotels,hospitals,industrial buildings and other places).Although it brings us comfortable life,there are some problems existing.Noise is one of the most concerned problems,which shall cause direct impact on people’s work and life.Therefore,how to reduce the noise of central air conditioning system is an important subject,which can not be ingored.

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