Aeroacoustic measurements /
The goal of aeroacoustic measurements is to provide a basis for assessing mechanisms of noise generation, and to develop methods of reducing noise to more acceptable levels. However, the measurements themselves are complex, and require a deep understanding of the experimental facility utilized (such...
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| Format: | eBook |
| Language: | English |
| Published: |
Berlin ; New York :
Springer,
2002.
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| Series: | Experimental fluid mechanics.
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| Subjects: | |
| Online Access: | Connect to the full text of this electronic book |
Table of Contents:
- 1. Microphone Measurements In and Out of Airstream. Research Objectives (and What to Measure). Wind Tunnel Background Noise Including Flow-Induced Noise. Microphone Placement. Reflections in a Semi-Anechoic Environment. Source Identification by Signal Processing. Convection Effects and Doppler Shift. Sound Propagation Through Shear Layers in Open-Jet Wind Tunnels. Change in Sound Pressure Level Caused by Refraction. Microphone Corrections at High Frequency. Scaling, Extrapolation and Flight Simulation
- 2. Beamforming in Acoustic Testing. Nomenclature. Analysis of Wind Tunnel Acoustic Propagation by Geometrical Optics. Array Source-Receiver Model. Beamforming. Effect of Wind Tunnel Walls. Removal of Flow Noise.