JET NOISE REDUCTION TECHNOLOGY （飞机降噪技术）.PDFVIP

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JET NOISE REDUCTION TECHNOLOGY （飞机降噪技术）.PDF

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JET NOISE REDUCTION TECHNOLOGY （飞机降噪技术）

ICAS 2002 CONGRESS JET NOISE REDUCTION TECHNOLOGY DEVELOPMENT AT GE AIRCRAFT ENGINES Steven Martens GE Aircraft Engines Cincinnati, Ohio, USA Keywords:j et noise, acoustics, nozzle Abstract with the sum of any two certification points totaling at least 2 dB, and no trades between Several y ears ago, GE Aircraft Engines realized points. This new standard was anticipated, and that with the exp ected increased stringency of some current engine aircraft combinations were Stage 4 noise regulations, the continued thrust known to require changes to remain in growth of enginef amilies, and increasing compliance. Trades were allowed in the past environmental p ressures, j et noise would where at one certification point the noise could become a restrictingf actor in aircraft be above the certification limit. In cases where operations. An internal research and an aircraft had low noise at two certification development p rogram, with some invaluable points but exceeded the all