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Author: National Aeronautics and Space Administration (NASA) Publisher: Createspace Independent Publishing Platform ISBN: 9781720630371 Category : Languages : en Pages : 92
Book Description
This report describes an empirical prediction procedure for turbofan engine noise. The procedure generates predicted noise levels for several noise components, including inlet- and aft-radiated fan noise, and jet-mixing noise. This report discusses the noise source mechanisms, the development of the prediction procedures, and the assessment of the accuracy of these predictions. Finally, some recommendations for future work are presented.Herkes, William H. and Reed, David H.Langley Research CenterNOISE PREDICTION (AIRCRAFT); JET AIRCRAFT NOISE; AERODYNAMIC NOISE; ENGINE NOISE; JET MIXING FLOW; TURBOFAN ENGINES; ENGINE PARTS; ACCURACY; FAN BLADES; AEROACOUSTICS; NOISE INTENSITY
Author: National Aeronautics and Space Administration (NASA) Publisher: Createspace Independent Publishing Platform ISBN: 9781720630371 Category : Languages : en Pages : 92
Book Description
This report describes an empirical prediction procedure for turbofan engine noise. The procedure generates predicted noise levels for several noise components, including inlet- and aft-radiated fan noise, and jet-mixing noise. This report discusses the noise source mechanisms, the development of the prediction procedures, and the assessment of the accuracy of these predictions. Finally, some recommendations for future work are presented.Herkes, William H. and Reed, David H.Langley Research CenterNOISE PREDICTION (AIRCRAFT); JET AIRCRAFT NOISE; AERODYNAMIC NOISE; ENGINE NOISE; JET MIXING FLOW; TURBOFAN ENGINES; ENGINE PARTS; ACCURACY; FAN BLADES; AEROACOUSTICS; NOISE INTENSITY
Author: William H. Herkes Publisher: BiblioGov ISBN: 9781289147549 Category : Languages : en Pages : 94
Book Description
This report describes an empirical prediction procedure for turbofan engine noise. The procedure generates predicted noise levels for several noise components, including inlet- and aft-radiated fan noise, and jet-mixing noise. This report discusses the noise source mechanisms, the development of the prediction procedures, and the assessment of the accuracy of these predictions. Finally, some recommendations for future work are presented.
Author: National Aeronautics and Space Administration (NASA) Publisher: Createspace Independent Publishing Platform ISBN: 9781720630210 Category : Languages : en Pages : 36
Book Description
This is a user's manual for Modular Engine Noise Component Prediction System (MCP). This computer code allows the user to predict turbofan engine noise estimates. The program is based on an empirical procedure that has evolved over many years at The Boeing Company. The data used to develop the procedure include both full-scale engine data and small-scale model data, and include testing done by Boeing, by the engine manufacturers, and by NASA. In order to generate a noise estimate, the user specifies the appropriate engine properties (including both geometry and performance parameters), the microphone locations, the atmospheric conditions, and certain data processing options. The version of the program described here allows the user to predict three components: inlet-radiated fan noise, aft-radiated fan noise, and jet noise. MCP predicts one-third octave band noise levels over the frequency range of 50 to 10,000 Hertz. It also calculates overall sound pressure levels and certain subjective noise metrics (e.g., perceived noise levels).Golub, Robert A. (Technical Monitor) and Herkes, William H. and Reed, David H.Langley Research CenterENGINE NOISE; JET AIRCRAFT NOISE; USER MANUALS (COMPUTER PROGRAMS); NOISE PREDICTION (AIRCRAFT); TURBOFAN ENGINES; MODULES; FAN BLADES; INPUT/OUTPUT ROUTINES; FREQUENCY RANGES; DATA PROCESSING; SCALE MODELS; SOUND PRESSURE
Author: Nasa Technical Reports Server (Ntrs) Publisher: BiblioGov ISBN: 9781289265915 Category : Languages : en Pages : 40
Book Description
This is a user's manual for Modular Engine Noise Component Prediction System (MCP). This computer code allows the user to predict turbofan engine noise estimates. The program is based on an empirical procedure that has evolved over many years at The Boeing Company. The data used to develop the procedure include both full-scale engine data and small-scale model data, and include testing done by Boeing, by the engine manufacturers, and by NASA. In order to generate a noise estimate, the user specifies the appropriate engine properties (including both geometry and performance parameters), the microphone locations, the atmospheric conditions, and certain data processing options. The version of the program described here allows the user to predict three components: inlet-radiated fan noise, aft-radiated fan noise, and jet noise. MCP predicts one-third octave band noise levels over the frequency range of 50 to 10,000 Hertz. It also calculates overall sound pressure levels and certain subjective noise metrics.
Author: National Aeronautics and Space Administration (NASA) Publisher: Createspace Independent Publishing Platform ISBN: 9781721094264 Category : Languages : en Pages : 178
Book Description
This Final Report has been prepared by AlliedSignal Engines and Systems, Phoenix, Arizona, documenting work performed during the period May 1997 through June 1999, under the Small Engines Technology Program, Contract No. NAS3-27483, Task Order 13, ANOPP Noise Prediction for Small Engines. The report specifically covers the work performed under Subtasks 4, 5 and 6. Subtask 4 describes the application of a semi-empirical procedure for jet noise prediction, subtask 5 describes the development of a procedure to predict the effects of wing shielding, and subtask 6 describes the results of system studies of the benefits of the new noise technology on business and regional aircraft. Lieber, Lysbeth and Golub, Robert (Technical Monitor) Langley Research Center NAS3-27483; RTOP 538-03-13-01
Author: National Aeronautics and Space Administration (NASA)
Author: National Aeronautics and Space Administration (NASA)
Author: William H. Herkes
Author: National Aeronautics and Space Administration (NASA)
Author: Nasa Technical Reports Server (Ntrs)
Author: National Aeronautics and Space Administration (NASA)
Author: 
Author: Lysbeth Lieber
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Author: 
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