Design and Implementation of a Phased Microphone Array in a Closed-Section Wind Tunnel

2006 ◽  
Author(s):  
Ho-Chul Shin ◽  
Will Graham ◽  
Pieter Sijtsma ◽  
Christodoulos Andreou ◽  
Andrew Faszer
Keyword(s):  
Wind Tunnel ◽  
Microphone Array ◽  
Design And Implementation

Synthetic Sound Source Generation for Acoustical Measurements in Turbomachines

2013 ◽  
Author(s):  
Michael Bartelt ◽  
Juan D. Laguna ◽  
Joerg R. Seume
Keyword(s):  
Wind Tunnel ◽  
Sound Source ◽  
Sound Propagation ◽  
Microphone Array ◽  
Sound Field ◽  
Acoustic Mode ◽  
Acoustic Excitation ◽  
Noise Emission ◽  
Noise Sources ◽  
Sound Fields

One of the greatest challenges in modern aircraft propulsion design is the reduction of the engine noise emission in order to develop quieter aircrafts. In the course of a current research project, the sound transport in low pressure turbines is investigated. For the corresponding experimental measurements, a specific acoustic excitation system is developed which can be implemented into the inlet of a turbine test rig and into an aeroacoustic wind tunnel. This allows for an acoustic mode generation and a synthesis of various sound source patterns to simulate typical turbomachinery noise sources such as rotor-stator interaction, etc. The paper presents the acoustical and technical design methodology in detail and addresses the experimental options of the system. Particular attention is paid to the design and the numerical optimization of the acoustic excitation units. To validate the sound generator during operation, measurements are performed in an aeroacoustic wind tunnel. For this purpose, an in-duct microphone array with a specific beamforming algorithm for hard-walled ducts is developed and applied to identify the source locations. The synthetically excited sound fields and the propagating acoustic modes are measured and analyzed by means of modal decomposition techniques. The measurement principles and the results are discussed in detail and it is shown that the intended sound source is produced and the intended sound field is excited. This paper shall contribute to help guide the development of excitation systems for aeroacoustic experiments to better understanding the physics of sound propagation within turbomachines.

Implementation of a Phased Microphone Array in a Closed-Section Wind Tunnel

AIAA Journal ◽  
2007 ◽  
Vol 45 (12) ◽  
pp. 2897-2909 ◽  
Author(s):  
H.-C. Shin ◽  
W. R. Graham ◽  
P. Sijtsma ◽  
C. Andreou ◽  
A. C. Faszer
Keyword(s):  
Wind Tunnel ◽  
Microphone Array

scholarly journals Microphone-Array Measurements in a Cryogenic Wind Tunnel

AIAA Journal ◽  
2010 ◽  
Vol 48 (7) ◽  
pp. 1470-1479 ◽  
Author(s):  
Thomas Ahlefeldt ◽  
Lars Koop
Keyword(s):  
Wind Tunnel ◽  
Microphone Array ◽  
Array Measurements ◽  
Cryogenic Wind Tunnel

scholarly journals Sistema Aerodinámico para un Sistema Eólico de Baja Potencia

2019 ◽  
pp. 19-26
Author(s):  
Alejandro Linares-Enríquez ◽  
Ivan Martinez-Zepeda
Keyword(s):  
Wind Speed ◽  
Wind Tunnel ◽  
Control Design ◽  
Climatic Changes ◽  
Guidance System ◽  
Wind System ◽  
Design And Implementation ◽  
Orientation Mechanism ◽  
Simulation Control ◽  
Electronic Elements

One of the main needs of the society is to have electric power in their homes, which is why an orientation mechanism of the aerodynamic system for a Low Power Wind System is developed, developing the mechanical and electronic elements for orientation according to the gusts of wind, but its development is directed to moderate winds, up to 12 km / s, considering its application for supply or if they already have electricity for self-supply, considering the simulation, control, design and implementation of the aerodynamic system , its form of mechanical and electronic orientation, as well as determining how the incidence of wind affects each of the aerodynamic components of the wind turbine and how each of the climatic changes to which it is subjected affects them, such as humidity and wind speed, how the system behaves within certain wind intervals in areas in which can be implemented, so that tests in a wind tunnel of aerodynamic behavior will be developed and the elements of the guidance system of the blades and dynamic behavior tests that designate the material for the manufacture of the system will be established.

Sign in / Sign up

Export Citation Format

Share Document