Flap noise measurements in a closed wind tunnel with a phased array

2001 ◽  
Author(s):  
Henk van der Wal ◽  
Pieter Sijtsma
Keyword(s):  
Wind Tunnel ◽  
Phased Array ◽  
Noise Measurements

Wind Tunnel Noise Measurements

1960 ◽  
Vol 32 (7) ◽  
pp. 932-932
Author(s):  
William J. Galloway
Keyword(s):  
Wind Tunnel ◽  
Noise Measurements

Airframe noise measurements in a large hard-walled closed-section wind tunnel

2019 ◽  
Vol 146 ◽  
pp. 96-107 ◽  
Author(s):  
Alessandro Di Marco ◽  
Lorenzo Burghignoli ◽  
Francesco Centracchio ◽  
Roberto Camussi ◽  
Thomas Ahlefeldt ◽  
...  
Keyword(s):  
Wind Tunnel ◽  
Airframe Noise ◽  
Noise Measurements

Measurement of ARJ21 Aircraft Landing Gear Noise Using Array Signal Processing Technology

2012 ◽  
Vol 588-589 ◽  
pp. 747-750
Author(s):  
Tao Chen ◽  
Hong Hou ◽  
Zhi Fei Chen ◽  
Cheng Kun Jiang
Keyword(s):  
Array Signal Processing ◽  
Phased Array ◽  
Landing Gear ◽  
Gear Noise ◽  
Doppler Shifts ◽  
Aircraft Landing ◽  
Data Processing Method ◽  
Spatially Distributed ◽  
Noise Measurements ◽  
Landing Gear Noise

Flyover noise measurements were conducted on an aircraft ARJ21 aiming at landing gear noise prediction schemes. The analysis is based on acoustic dedopplerized spectra and localization maps was calculated with the pressure signals of a acoustic phased array with 30 microphones. The acoustic phased array is a spatially distributed set of microphones which simultaneously sample the acoustic field. The doppler shifts was removed using linear interpolation.By appropriately time delaying the output of individual microphones, the origin and level of noise source(the landing gear) can potentially be determined. The success of this approach depends largely on the phased array design, and the array data processing method. This paper focuses on the two areas.

Pletharrays for aeroacoustic phased array applications

2017 ◽  
Vol 16 (4-5) ◽  
pp. 202-229 ◽  
Author(s):  
James R Underbrink
Keyword(s):  
Wind Tunnel ◽  
Phased Array ◽  
Noise Source ◽  
Array Element ◽  
Source Imaging ◽  
Array Measurements ◽  
Extensive Measurement ◽  
Transonic Wind Tunnel

“Pletharrays” are introduced, motivated, and presented for application to aeroacoustic phased array measurements. Pletharrays contain a plethora of arrays composed from a modest to high number of array elements to field a remarkably large number of high element count arrays for use in noise source imaging applications. Pletharrays that have been deployed for closed jet transonic wind tunnel, static engine ground, open jet wind tunnel, and flyover phased array tests are presented. Tremendous array element leverage to provide extensive measurement flexibility and fidelity are demonstrated.

A transformation of the acoustic equation with implications for wind-tunnel and low-speed flight tests

1978 ◽  
Vol 363 (1713) ◽  
pp. 271-281 ◽  
Keyword(s):  
Wind Tunnel ◽  
Velocity Potential ◽  
The Body ◽  
Ordinary Wave ◽  
Flight Tests ◽  
Low Mach Number ◽  
Low Speed ◽  
Simple Effect ◽  
Acoustic Equation ◽  
Noise Measurements

This paper describes a transformation in time which reduces the equation governing the acoustic velocity potential, in a steady homentropic potential flow at low Mach number, to an ordinary wave equation. The transformation is applied when the basic flow is a uniform stream flowing past a fixed body. It is shown that, in coordinates fixed in the body, the flow has a very simple effect on the far field generated by a stationary compact sound source. This has important implications for the analysis of noise measurements from wind-tunnel and low-speed flight tests. The method can be extended to cases where the body surface is weakly vibrating.

scholarly journals A Comparison of Microphone Phased Array Methods Applied to the Study of Airframe Noise in Wind Tunnel Testing

2017 ◽  
Author(s):  
Christopher J. Bahr ◽  
William M. Humphreys ◽  
Daniel Ernst ◽  
Thomas Ahlefeldt ◽  
Carsten Spehr ◽  
...  
Keyword(s):  
Wind Tunnel ◽  
Phased Array ◽  
Wind Tunnel Testing ◽  
Airframe Noise ◽  
Tunnel Testing
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