Noise Control Modification of 30-kw, 400-Hz DOD Diesel Generator Set.

摘要

The purpose of this work was to develop a noise control modification kit, applicable to existing US Army 30 KW, 400Hz Department of Defense (DOD) diesel engine driven generator sets, as well as sets in production, and capable of meaningful performance in terms of current noise criteria. A target level of 90 dBA at 1 meter was proposed with a potential target reduction of 25 dBA consonant with the design constraints imposed. A number of configurations, including several cooling air exhaust arrangements, were tested in full scale on a 30-KW, 400-Hz set. The final configuration comprises components which can easily be applied to existing sets to achieve less than 90 dBA at 3 feet and 76 dBA at 25 feet. Application of the kit requires only the bolting on of intake and exhaust silencers in place of existing grills, the cutting of an auxiliary air intake opening in an existing top enclosure panel, and the attachment of acoustical panels to existing enclosure doors, the bottom of the existing skid, and to the modified top enclosure panel. Further significant noise reduction would require a complete new enclosure, vibration isolation between the engine-generator and the set frame, an improved engine exhaust muffler, and redesign of the engine cooling system. (Author)