Page 4 - Winter2014

Acoustics
A publication of the Acoustical Society of America
Volume 10 | Issue 1 | Winter 2014
Today
TAbLE Of CONTENTS 6 from the Editor
8 Letters to the Editor featured Articles
10 Acoustical Horizontal Array
Coherence Lengths and the “Carey Number” James F. Lynch, Timothy F. Duda and John A. Colosi
The late Bill Carey came up with the rule of thumb that the horizontal array coherence length in shallow water is, on the average, 30 wave- lengths.
20 How Does Wind Turbine Noise Affect People? Alec N. Salt and Jeffrey T. Lichtenhan
The many ways by which unheard infrasound and low-frequency sound from wind turbines could distress people living nearby are described.
30 Exploring Our Sonic Environment Through Soundscape Research and Theory Bennett M. Brooks, Brigitte Schulte-Fortkamp, Kay S. Voigt and Alex U. Case
“How can we know what people think of their sonic environment? - Well, we ask them!”
About the Cover
Departments
41 | Book Reviews – Philip L. Marston
A Dictionary of Hearing by Maryanne Maltby, Ultrasonic and Electromagnetic NDE for Structure and Material Characterization by Tribikram Kundu (editor), Computa- tional Aeroacoustics: A wave number approach by Chris- topher K. W. Tam, and Unsteady Combustor Physics by Tim C. Lieuwen.
50 | Passings Tributes to Kim C. Benjamin, Stephen H. Crandall and William C. Cummings.
55 | ASA News – Allan D. Pierce
Barbara Shinn-Cunningham receives mentoring award, Smartphone APP Student Competition, James A. Sim- mons receives Gerritt S. Miller Award, Editorial Manager to replace PXP, POMA submission requirements may change.
58 | ASA Announcements
Allan D. Pierce and Arthur N. Popper
Acoustical Society Foundation, Acoustics Today Update and Acoustics Today Interns
62 Classifieds
63 business Directory 64 Advertisers Index
2 | Acoustics Today | Winter 2014
The top panel shows a time series of the vertical displacement of the water column, with nonlin- ear internal wave trains very evident. The second panel shows the angle at which the transmitted signal hits the array, which is stable at ~28 degrees, except when the internal wave trains pass through, which pushes the energy out of plane (a 3D effect). The third panel shows the “Carey Number” (Lcoh / λ) measurement. In the fourth panel is shown coherence length versus steering angle, the the source of second and third panel results.