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Measured and calculated transmission losses of sound waves through a helium layer PDF Download. Download free ebook of Measured and calculated transmission losses of sound waves through a helium layer in PDF format or read online by Thomas D. Norum,Langley Research Center,United States. National Aeronautics and Space Administration Published on 1973 by

An experiment was performed to measure the transmission losses of sound waves traversing an impedance layer. The sound emanated from a point source and the impedance layer was created by a low-speed helium jet. The transmission losses measured were of the order of 12 db for frequencies of the source between 4 and 12 kHz. These losses are greater than those predicted from analysis when the observer angle is less than about 35 deg, but less than those predicted for larger observer angles. The experimental results indicate that appreciable noise reductions can be realized for an observer shielded by an impedance layer, irrespective of his position relative to the source of sound.

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Download Measured and calculated transmission losses of sound waves through a helium layer PDF Free

Download Measured and calculated transmission losses of sound waves through a helium layer Books Free

Download Measured and calculated transmission losses of sound waves through a helium layer Free

Download Measured and calculated transmission losses of sound waves through a helium layer PDF

Download Measured and calculated transmission losses of sound waves through a helium layer Books