| They try to get quiet on UAV |
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They fly close to the enemy and exciting behind their lines. But some smygare they are not, the unmanned aircraft UAV. Two researchers are now trying to get quiet on them. The engines of the unmanned planes make a noise and slows the craft's progress. Researchers at Georgia Tech Research Institute, STRI, which specializes in acoustic signatures, is to find out where the sound occurs (exhaust sound and propeller sound) and how best to mitigate noise.Rick Gaeta and Gary Gray uses a small wind tunnel to simulate flights and measure the sound. They have built an engine dynamometer, which they drive in the wind tunnel and measurement of both engine performance sound. One of the challenges is to find a way to dampen the sound that does not interfere with any audio sensors installed in the unmanned plane to listen to audio on the ground. Sound damping may not affect how a UAV can be seen on radar or detected by ir-means. Besides experiments in wind tunnel, the researchers have also studied the small remote-controlled reconnaissance craft in the real flight test at STRI, and visited military units using UAV for reconnaissance. Until now, it has gathered so much data that you feel ready to build a prototype. |
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| Last Updated ( Wednesday, 18 February 2009 ) |
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