Some large gas engines, medium and low-speed diesel engines,and manyplaces with high noise requirements need to be equipped with exhaust silencers for the engines. The exhaust mufler ofthe engine unit needs to reducethe dieselenginecombustion noise transmited bythe intake pipe in theair supply system based on the spectral characteristicsofthe engine exhaust pipe noise,sothat its operating noise is effectively reduced, and the operating performance of the diesel engine is maintained.Not affected.