Hydraulic excavator noise control case study as part of a comprehensive mitigation plan of an integrated open-pit coalmine and powerplant

摘要

Noise control of a 500 tonne, 2500 hp hydraulic mining excavator is used as a case study to describe the detailed noise control of one piece of equipment as part of a comprehensive noise mitigation plan of an integrated open-pit coalmine and powerplant. An environmental noise model of the entire mining and powerplant operations was developed and used to facilitate a combination of equipment operation and individual equipment noise reduction targets. Noise control equipment was designed and engineered to meet the equipment noise reduction targets and maintain equipment operation. The individual noise control equipment developed for a hydraulic mining excavator is detailed as a case study because the excavator noise levels were the highest in the mine. The individual noise sources which contribute to the overall noise signature of the excavator were measured and quantified for inclusion with the comprehensive environmental noise model. Noise control options for the various component noise sources were evaluated and the option to significantly reduce the engine exhaust noise source was selected. Custom, very high specification engine exhaust silencers were developed, installed, and commissioned to successfully reduce the excavator noise signature consistent with the comprehensive environmental noise model.