Acoustical Meeting, Nov. 10-14, 2008 in Miam...(a distance of one kilometer or more. How...)

Date:11/5/2008

a distance of one kilometer or more. However, in some places the detection range is limited by temperature gradients that deflect sound waves. The best solution here is to add more low-cost nodes to illuminate the other side of the sound barrier. The company has begun making SDSN commercially available.

The talk, "Impact of the harbor environment on the performance of a swimmer" (4aUW8) by Peter Stein is at 9:45 a.m. on Thursday, November 13.

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8) VISUALIZING VIBRATIONS IN MUSICAL INSTRUMENTS

Musical instruments emit the sounds we recognize as music by vibrating in numerous normal modes. At session 3aMU, the first speaker, Thomas Rossing of Stanford University provides an overview of how normal modes are studied. The modes can be studied through experiments -- such as holographic interferometry, speckle pattern interferometry, or scanning laser vibrometry -- or they can be studied mathematically by solving, or partially solving, the complicated equations governing the vibrations. Papers 2, 3, and 5 at the session are quite notable in that they report on studies of modal analysis of musical instruments using inexpensive speckle pattern interferometers built by faculty and students at small undergraduate colleges. In this approach many short pictures of the vibrating instruments are taken and then processed together to form a single, cleaner picture. The images they produce rival the images obtained with expensive holographic interferometers. Papers 4 and 8 present examples of mathematical modal analysis of musical instruments using a finite element computer program, which sidestep solving the complicated differential equations governing the modes through the use of numerical methods.

The session "Musical Acoustics and Structural Acoustics and Vibration: Structural Vibrations in Musical Instruments" (3aMU) takes place from 8:00 a.m. to at 11:45 a.m. on Wednesday, November 12.

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9) UNDERSTANDING RHYTHM MA
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Contact: Jason Bardi jbardi@aip.org 301-209-3091 American Institute of Physics Source:Eurekalert

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