A Semi-empirical Jet Noise Model Derived Using the Energy Spectrum Function PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download A Semi-empirical Jet Noise Model Derived Using the Energy Spectrum Function PDF full book. Access full book title A Semi-empirical Jet Noise Model Derived Using the Energy Spectrum Function by Miles Owen. Download full books in PDF and EPUB format.
Author: Miles Owen
Publisher:
ISBN:
Category : Aerodynamic noise
Languages : en
Pages : 0
Get Book Here
Book Description
Author: Miles Owen
Publisher:
ISBN:
Category : Aerodynamic noise
Languages : en
Pages : 0
Get Book Here
Book Description
Author: Martin Frederick Dawson
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 34
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 440
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 56
Get Book Here
Book Description
Author: Thomas D. Norum
Publisher:
ISBN:
Category : Cone
Languages : en
Pages : 36
Get Book Here
Book Description
The technique for determining the near and far acoustic field of a jet through measurements of pressure-gradient correlations on an imaginary conical surface surrounding the jet is discussed. The necessary analytical developments are presented, and their feasibility is checked by using a point source as the sound generator. The distribution of the apparent sources on the cone, equivalent to the point source, is determined in terms of the pressure-gradient correlations.
Author:
Publisher:
ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 628
Get Book Here
Book Description
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781719396714
Category :
Languages : en
Pages : 30
Get Book Here
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
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 384
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 358
Get Book Here
Book Description
