Comparison of predicted engine core noise with current and proposed aircraft noise certification requirements

Vonglahn, U. H.; Groesbeck, D.

doi:10.2514/6.1981-2053

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1983

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“…puts and outputs, defined by Eqs. In this report engine component transfer func- (1), (2), and (3), respectively tions computed from measured pressure fluctuations are presented for several turbofan engines. The ZE ratio of core exit impedance to transfer functions presented are: from the engine pECE tailpipe exit to the far-field, across the engine tailpipe, and across the turbine.…”

Section: Introductionmentioning

confidence: 99%

Application of 3-signal coherence to core noise transmission

Krejsa

1983

8th Aeroacoustics Conference

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Gmm' G uu' Gxx auto-spectra of variables m(t), u(t), and x(t), respectively A method for determining transfer functions CD across turbofan engine components and from the en-Gmn, Gmp , Gnp cross-spectra between variables de-Ln gine to the far-field is developed. The method is noted by subscripts 4; based on the 3-signal coherence technique used previously to obtain far-field core noise levels. This G uv' G uw , Gvw cross-spectra between variables demethod eliminates the bias error in transfer funcnoted by subscripts tion measurements due to contamination of measured pressures by nonpropagating pressure fluctuations. Gxy, Gxz' G yz cross-spectra between variables de-Measured transfer functions from the engine to the noted by subscripts far-field, across the tailpipe, and across the turbine are presented for three turbofan engines. H true transfer function Hm estimated transfer function

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Section: Introductionmentioning

confidence: 99%

Application of 3-signal coherence to core noise transmission

Krejsa

1983

8th Aeroacoustics Conference

View full text Add to dashboard Cite

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Comparison of predicted engine core noise with current and proposed aircraft noise certification requirements

Cited by 1 publication

References 0 publications

Application of 3-signal coherence to core noise transmission

Application of 3-signal coherence to core noise transmission

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