Handling Jet Engine Noise Data

Noise Control ◽  
1955 ◽  
Vol 1 (2) ◽  
pp. 46-69 ◽  
Author(s):  
John M. Tyler
Keyword(s):  
Engine Noise ◽  
Jet Engine ◽  
Noise Data

The effects of jet engine noise on the cochlear response of the guinea pig.

1949 ◽  
Vol 42 (6) ◽  
pp. 517-525 ◽  
Author(s):  
Irving E. Alexander ◽  
Fredrick J. Githler
Keyword(s):  
Guinea Pig ◽  
Engine Noise ◽  
Jet Engine

scholarly journals A New Jet Engine Noise Suppressor

1961 ◽  
Vol 33 (11) ◽  
pp. 1683-1683
Author(s):  
R. N. Lane ◽  
E. E. Mikeska ◽  
C. D. Anderson
Keyword(s):  
Engine Noise ◽  
Jet Engine

Designing Clean Jet-Noise Facilities and Making Accurate Jet-Noise Measurements

2003 ◽  
Vol 2 (3) ◽  
pp. 371-412 ◽  
Author(s):  
K. K. Ahuja
Keyword(s):  
Frequency Response ◽  
Internal Noise ◽  
Jet Noise ◽  
Noise Spectrum ◽  
Full Scale ◽  
Research Facility ◽  
High Quality ◽  
Jet Engine ◽  
Noise Measurements ◽  
Noise Data

The main objective of this paper is to provide guidelines for designing and calibrating a high quality, static, jet-noise research facility and making high-quality jet noise measurements. Particular emphasis is placed on methodology for determining if internal noise is dominant in the jet noise spectrum. A section of this document is devoted to clarifying the terminology associated with microphone frequency response corrections and providing a step-wise description of other corrections that must be applied to the measured raw spectra before the jet noise data can be considered accurate and ready for use for extrapolation to full-scale jet engine noise.

A Subjective Experiment with Helicopter Noises

1961 ◽  
Vol 65 (609) ◽  
pp. 635-637 ◽  
Author(s):  
D. W. Robinson ◽  
J. M. Bowsher
Keyword(s):  
Spectrum Analysis ◽  
Present Experiment ◽  
Subjective Effects ◽  
Noise Characteristic ◽  
Engine Noise ◽  
Jet Engine ◽  
Helicopter Noise ◽  
Subjective Experiment

Following upon an experiment on the subjective effects of jet engine noise we have recently undertaken a similar experiment, this time on the subjective aspects of helicopter noise. The purpose of the earlier experiment was to determine the reliability of various methods of rating based on spectrum analysis, so far as comparisons between jet- and piston-engined aircraft are concerned. The main objective of the present experiment was to find if these methods are applicable to the pulsating types of noise characteristic of helicopters.

Comparison of Measured Low-Frequency Engine Noise With Combustion and Jet Noise Predictions for a Turbofan Engine With an Internal Lobed Mixer Nozzle

2007 ◽  
Author(s):  
Lysbeth S. Lieber ◽  
Donald S. Weir
Keyword(s):  
Low Frequency ◽  
Jet Noise ◽  
Combustion Noise ◽  
Noise Model ◽  
Engine Noise ◽  
Turbofan Engine ◽  
Technology Program ◽  
Modeling Techniques ◽  
Noise Data ◽  
Static Conditions

This paper presents an examination of the low-frequency engine noise of a turbofan engine with an internal lobed mixer nozzle, and identifies the contributions of the combustion and exhaust jet component noise sources within the low frequency portion of the spectrum by applying recently developed modeling techniques. This investigation was performed as part of the NASA Quiet Aircraft Technology Program. Because the mixer reduces the total jet noise, the combustion noise source becomes a significant contributor. In addition, the character of the jet noise for the mixer nozzle is different from that for a single-stream or coannular nozzle. Although the internal mixer reduces the low-frequency shear-induced jet noise, it also produces an additional higher frequency contribution to the jet noise due to enhanced turbulence levels produced by the mixing process. Therefore, the modeling techniques that predict the low-frequency component source noise must capture sufficient physics of the noise generation process for the combustor and mixer nozzle to accurately represent the component spectral distributions. The improved modeling of component source noise for both combustor and jet sources was addressed as part of the NASA Quiet Aircraft Technology Program. This activity included development of a new narrowband combustion noise model, as well as the application of a recent jet noise model for nozzles with internal forced mixers. The noise data used in this study was taken during the NASA Engine Validation of Noise Reduction Concepts (EVNRC) Program. Both static and flight noise measurements were made at a range of power settings using the Honeywell TFE731-60 turbofan engine. The engine configuration of interest for this study employed a nozzle with an internal lobed mixer. Comparison of static and flight data with predictions from the combustion and jet noise models indicates that combustor noise has a significant contribution to lower-frequency engine noise (in the 400–1000 Hz range), particularly for flight conditions, where the jet noise is reduced due to flight effects, and also for lower power settings at static conditions. However, further calibration of the combustion and jet noise prediction techniques will be required, with isolated component noise data, before these models may be applied with certainty to model total engine noise in the low-frequency range.

Reducing Communication Overhead in Large Eddy Simulation of Jet Engine Noise

2010 ◽  
Author(s):  
Yingchong Situ ◽  
Lixia Liu ◽  
Chandra S. Martha ◽  
Matthew E. Louis ◽  
Zhiyuan Li ◽  
...  
Keyword(s):  
Large Eddy Simulation ◽  
Communication Overhead ◽  
Engine Noise ◽  
Jet Engine ◽  
Eddy Simulation ◽  
Large Eddy

Ejector and method for controlling jet engine noise

1986 ◽  
Vol 79 (5) ◽  
pp. 1644-1644
Author(s):  
Alfred L. Greenlaw
Keyword(s):  
Engine Noise ◽  
Jet Engine
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