http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
1 online resource (xiv, 313 pages) : illustrations.
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 as a wind tunnel), measurement instrumentation, and data analysis techniques. In this volume recent advances in the measurement and understanding of aerodynamically generated sound are presented by leaders in the development of new techniques in this field. Both basic and applied problems are covered in detail.
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.