درباره ما
NASA-CR-198300
Aircraft Noise Prediction Program (ANOPP) Fan Noise Prediction for Small Engines
Year: 1996
Abstract: The Fan Noise Module of ANOPP is used to predict the broadband noise and pure tones for axial flow compressors or fans. The module, based on the method developed by M. F. Heidmann, uses empirical functions to predict fan noise spectra as a function of frequency and polar directivity. Previous studies have determined the need to modify the module to better correlate measurements of fan noise from engines in the 3000To 6000-pound thrust class. Additional measurements made by AlliedSignal have confirmed the need to revise the ANOPP fan noise method for smaller engines. This report describes the revisions to the fan noise method which have been verified with measured data from three separate AlliedSignal fan engines. Comparisons of the revised prediction show a significant improvement in overall and spectral noise predictions.
Subject: AERODYNAMIC NOISE
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T16:24:06Z | |
| date available | 2017-09-04T16:24:06Z | |
| date copyright | 01/01/1996 | |
| date issued | 1996 | |
| identifier other | TUHOEEAAAAAAAAAA.pdf | |
| identifier uri | https://yse.yabesh.ir/std/handle/yse/87437 | |
| description abstract | The Fan Noise Module of ANOPP is used to predict the broadband noise and pure tones for axial flow compressors or fans. The module, based on the method developed by M. F. Heidmann, uses empirical functions to predict fan noise spectra as a function of frequency and polar directivity. Previous studies have determined the need to modify the module to better correlate measurements of fan noise from engines in the 3000To 6000-pound thrust class. Additional measurements made by AlliedSignal have confirmed the need to revise the ANOPP fan noise method for smaller engines. This report describes the revisions to the fan noise method which have been verified with measured data from three separate AlliedSignal fan engines. Comparisons of the revised prediction show a significant improvement in overall and spectral noise predictions. | |
| language | English | |
| title | NASA-CR-198300 | num |
| title | Aircraft Noise Prediction Program (ANOPP) Fan Noise Prediction for Small Engines | en |
| type | standard | |
| page | 186 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1996 | |
| contenttype | fulltext | |
| subject keywords | AERODYNAMIC NOISE | |
| subject keywords | DATA ACQUISITION | |
| subject keywords | JET ENGINES | |
| subject keywords | NOISE PREDICTION (AIRCRAFT) | |
| subject keywords | NOISE REDUCTION | |
| subject keywords | NOISE SPECTRA | |
| subject keywords | TURBOFANS |