Author: Martin Frederick Dawson
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
A Semi-empirical Jet-surface Interaction Noise Model
Author: Martin Frederick Dawson
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Developing an empirical model for jet-surface interaction noise
Author: Clifford Alan Brown
Publisher:
ISBN:
Category :
Languages : en
Pages : 24
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 24
Book Description
Developing an Empirical Model for Jet-Surface Interaction Noise
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781719396714
Category :
Languages : en
Pages : 30
Book Description
The process of developing an empirical model for jet-surface interaction noise is described and the resulting model evaluated. Jet-surface interaction noise is generated when the high-speed engine exhaust from modern tightly integrated or conventional high-bypass ratio engine aircraft strikes or flows over the airframe surfaces. An empirical model based on an existing experimental database is developed for use in preliminary design system level studies where computation speed and range of configurations is valued over absolute accuracy to select the most promising (or eliminate the worst) possible designs. The model developed assumes that the jet-surface interaction noise spectra can be separated from the jet mixing noise and described as a parabolic function with three coefficients: peak amplitude, spectral width, and peak frequency. These coefficients are fit to functions of surface length and distance from the jet lipline to form a characteristic spectra which is then adjusted for changes in jet velocity and/or observer angle using scaling laws from published theoretical and experimental work. The resulting model is then evaluated for its ability to reproduce the characteristic spectra and then for reproducing spectra measured at other jet velocities and observer angles; successes and limitations are discussed considering the complexity of the jet-surface interaction noise versus the desire for a model that is simple to implement and quick to execute. Brown, Clifford A. Glenn Research Center AIRCRAFT DESIGN; NOISE PREDICTION; COMPUTERIZED SIMULATION; ACOUSTIC SIMULATION; AEROACOUSTICS; AERODYNAMIC NOISE; JET AIRCRAFT NOISE; SURFACE REACTIONS; COMPUTATIONAL AEROACOUSTICS; COMPUTATIONAL FLUID DYNAMICS; NOISE REDUCTION; NOISE MEASUREMENT; FLUID FLOW; ENGINE AIRFRAME INTEGRATION; COEFFICIENTS; FREQUENCIES; AIRFRAMES; TURBULENCE; TRAILING EDGES; NOISE SPECTRA; JET MIXING FLOW
Publisher: Createspace Independent Publishing Platform
ISBN: 9781719396714
Category :
Languages : en
Pages : 30
Book Description
The process of developing an empirical model for jet-surface interaction noise is described and the resulting model evaluated. Jet-surface interaction noise is generated when the high-speed engine exhaust from modern tightly integrated or conventional high-bypass ratio engine aircraft strikes or flows over the airframe surfaces. An empirical model based on an existing experimental database is developed for use in preliminary design system level studies where computation speed and range of configurations is valued over absolute accuracy to select the most promising (or eliminate the worst) possible designs. The model developed assumes that the jet-surface interaction noise spectra can be separated from the jet mixing noise and described as a parabolic function with three coefficients: peak amplitude, spectral width, and peak frequency. These coefficients are fit to functions of surface length and distance from the jet lipline to form a characteristic spectra which is then adjusted for changes in jet velocity and/or observer angle using scaling laws from published theoretical and experimental work. The resulting model is then evaluated for its ability to reproduce the characteristic spectra and then for reproducing spectra measured at other jet velocities and observer angles; successes and limitations are discussed considering the complexity of the jet-surface interaction noise versus the desire for a model that is simple to implement and quick to execute. Brown, Clifford A. Glenn Research Center AIRCRAFT DESIGN; NOISE PREDICTION; COMPUTERIZED SIMULATION; ACOUSTIC SIMULATION; AEROACOUSTICS; AERODYNAMIC NOISE; JET AIRCRAFT NOISE; SURFACE REACTIONS; COMPUTATIONAL AEROACOUSTICS; COMPUTATIONAL FLUID DYNAMICS; NOISE REDUCTION; NOISE MEASUREMENT; FLUID FLOW; ENGINE AIRFRAME INTEGRATION; COEFFICIENTS; FREQUENCIES; AIRFRAMES; TURBULENCE; TRAILING EDGES; NOISE SPECTRA; JET MIXING FLOW
Including Finite Surface Span Effects in Empirical Jet-surface Interaction Noise Models
Author: Clifford A. Brown
Publisher:
ISBN:
Category :
Languages : en
Pages : 14
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 14
Book Description
A Semi-empirical Jet Noise Model Derived Using the Energy Spectrum Function
Author: Miles Owen
Publisher:
ISBN:
Category : Aerodynamic noise
Languages : en
Pages : 0
Book Description
Publisher:
ISBN:
Category : Aerodynamic noise
Languages : en
Pages : 0
Book Description
ICASE/LaRC Workshop on Benchmark Problems in Computational Aeroacoustics (CAA)
Author: Jay C. Hardin
Publisher:
ISBN:
Category : Aerodynamic noise
Languages : en
Pages : 412
Book Description
Publisher:
ISBN:
Category : Aerodynamic noise
Languages : en
Pages : 412
Book Description
Semi-empirical Methods for Coaxial Jet Noise Prediction
Author: Odenir de Almeida
Publisher:
ISBN:
Category : Jet engines
Languages : en
Pages : 75
Book Description
Publisher:
ISBN:
Category : Jet engines
Languages : en
Pages : 75
Book Description
A Model for Jet-surface Interaction Noise Using Physically Realizable Upstream Turbulence Conditions
Author: Mohammed Z. Afsar
Publisher:
ISBN:
Category :
Languages : en
Pages : 22
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 22
Book Description
The Prediction of STOVL Noise: Current Semi-empirical Methods and Comparisons with Jet Noise Data
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 34
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 34
Book Description
AIAA 76-487 - AIAA 76-530
Author:
Publisher:
ISBN:
Category : Aerodynamic noise
Languages : en
Pages : 672
Book Description
Publisher:
ISBN:
Category : Aerodynamic noise
Languages : en
Pages : 672
Book Description