Acoustics report - Sound Produced by Fans A report on an...

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Sound Produced by Fans A report on an experiment performed for ME 120 Experimental Methods Laboratory San Jose State University Department of Mechanical and Aerospace Engineering Report by: Laboratory Date: April 6, 2009 Report Date: April 13, 2009 1
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Abstract The sound created by two different fans was measured using a sound level meter. In order to prevent external noises form interfering with the experiment, the measurements were taken inside the sound proof room (anechoic chamber). It was seen that the size and voltage (speed) of the fans have a direct effect on the sound level produced. The larger the fan the more noise was produced, with increasing voltage (speed) the higher the noise produced. 2
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Background and Objectives This experiment was done with the following objectives: Become familiar with hardware and techniques to measure sound pressure Measure the sound level of various sizes of fan Calculate the signal-to-noise ratio of acoustic measurements Investigate the noise of the fan modules as a function of size and operating speed The use of two fans of different sizes had their sound output measured at different supply voltages which directly relates to different speed. The fans were placed in an anechoic chamber (a sound proof room) to avoid any interference from external noises and sounds. Sound can be view as small variation in air pressure that will be collected by the sound
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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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Acoustics report - Sound Produced by Fans A report on an...

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