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Optimization of acoustic louvers in the design of silenced version of portable screw compressors M. Jeyaselvan, Principal Specialist - NVH G. Maga Vijayan, Sr Lead Engineer- NVH ELGi Equipments Ltd, Coimbatore Diesel engine driven portable screw compressors find a key place for providing reliable compressed air solutions for the construction, mining, water well and infrastructure sectors. The down the hole (DTH) drilling is a highly technically demanding application for compressors as it should meet the critical requirements of faster penetration, reliable performance and fuel economy in drilling operations. In urban residential locations for water well applications, while the rig compressor is in operation, there is a significant need to minimize the radiated noise levels from the compressor which causes discomfort to the direct and indirect community associated with the operation. This paper describes the critical challenges associated in the design and development of the silent version of these compressors. The design process involves acoustic hot spot identifications through sound intensity mapping followed by mitigation through acoustic design modifications. This includes the optimization of the engine exhaust silencers acoustic material absorption, and the acoustic leakage in the enclosure to achieve the required overall noise reduction. Owing to the conflicting nature of the heating and ventilation requirements of the compressor to the acoustic leakages from the enclosure, the acoustic louvers alias parallel baffle mufflers requires multi-parameter optimization in terms of noise attenuation, static pressure and flow requirements of the cooling system, space and cost. This paper describes in detail, the design and optimization of these parallel baffle mufflers using an in-house developed acoustic louver design tool. The paper also summarizes the effective overall noise reduction after the implementation of the optimized design of the acoustic louvers in the compressor package. The implementation has resulted in the realization of an additional sound power reduction of 5dBA arising from the optimization of parallel baffle mufflers in the design of silenced version of portable compressors.
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