Page 6 - Winter 2009

Acoustics Today
A Publication of the Acoustical Society of America
Volume 5, Issue 4 October 2009
VOLUME 5, ISSUE 4 OCTOBER 2009
Acoustics Today
Underwater Noise Standard and more
Technical Committee on Noise Issue
Minneapolis Sues its Airports Commission Low-noise Hemi-anechoic Chamber Geothermal Noise Control
Hot Topics in Noise
A publication of the Acoustical Society of America
Cover: The photo shows a geothermal drill rig in the Geysers area of California after encountering steam. The steam flows from the well head, through a horizontal pipe, to a cyclonic (rock) separator and out the top. Photo courtesy of Calpine Corporation.
7 From the Editor
Articles:
8 Minneapolis, Eagan, and Richfield vs. the Metropolitan Airports Commission—
Paul Schomer and Jack Freytag
The Metropolitan Airports Commission of Minneapolis was “just kidding” when they promised to sound insu- late homes in the 60 – 65 day-night average sound level (DNL) zone.
16 Designing and Building a Low-noise Hemi-anechoic Chamber—Douglas F. Winker
Low-noise products are creating new design challenges for low-noise testing environments.
23 Geothermal Noise Control—Marshall Long
The first trial turned out to be more of a rock launcher than a rock muffler.
26 Hot Topics in Noise—Nancy S. Timmerman Seven topics of current interest in the Technical Committee on Noise
Departments:
30 Standards: Acoustical Society of America Standard Goes Underwater—Michael A. Bahtiarian
The Acoustical Society of America (ASA) has just released a new standard for the measurement of the underwater
noise from ships. It is the first underwater standard for the ASA and the first known civilian standard in the world for quantifying underwater sound from ships.
34 Acoustical News—Elaine Moran
Acoustical news from around the country and around the world.
39 Books and Publications—Dick Stern
New and recent reports, publications, and brochures on acoustics.
40 Instrumentation—Dick Stern
New and recent acoustic instrumentation and news about acoustic instrument manufacturers.
43 Passings—Dick Stern A farewell to colleagues
Business Directory
46 Business card advertisements
47 Classified
Classified advertisements, including positions offered and positions desired.
48 Index to Advertisers
Table of Contents 5