JSC “Transmashholding” (TMH), has developed and tested a new system that reduces the noise emitted by air conditioning arrangements. It will be installed on the upcoming metro carriages, locomotives, EMUs, and other rolling stock. The new system is formed by a set of proprietary assemblies located in the air ducts of a vehicle. While forming an unobstructed flow of air, they block acoustic radiation produced by the HVAC fans. During the tests, noise levels were measured with specialised co
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