Sound Pressure - Sound Pressure Measurement ME 120...

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Unformatted text preview: Sound Pressure Measurement ME 120 Experimental Methods Lab Section 2 Experiment Date: April 6, 2009 April 13, 2009 Abstract In this experiment, we recorded the decibel reading for a large and small fan at the different increasing voltages that correlates with increasing speed. This was possible by using a LABView program that was already made specifically for this experiment. This also gave us the opportunity to find the decibel reading for ambient noise inside an Anechoic Chamber to calculate different Signal to Noise ratios. This showed us that as speed increases, the decibel ratio readings increased as well which means that the outside noise had less of a factor into the true noise. Background & Objectives Sound is an interesting concept that does not have any real type of physical form but could travel in high speeds and could have different variances of air pressure. It can be described as a sound wave because it has different properties like frequencies, wavelengths, periods, and amplitudes. At a constant temperature of 20C, sound travels at 344 m/s which is incredibly fast for something that cannot be seen but only heard. When noise occurs in an anechoic chamber,...
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This note was uploaded on 09/08/2010 for the course ME 120 at San Jose State University .

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Sound Pressure - Sound Pressure Measurement ME 120...

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