Making wind chimes out of copper pipe, determining length needed?
i have to make wind chimes for a physics project, and i thought that the equation was frequency = speed of sound/(2 x length). im using 340 m/s for the speed of sound, and also incorporating the diameter (which is 1 inch or 2.54 cm) so the denominator of the equation is now 2(length + 0.8d). using this equation i cut and hung all the pipes for the frequencies i needed, but none of the pipes are in tune to the note they are supposed to be. does anyone know why this happened? i had someone else check my math and it is all right. again, using the equation frequency = (340 m/s)/(2(length + 0.8diameter)
Tagged with: 8d • denominator • diameter • google • math • physics project • pipes • script type • speed of sound • text javascript • wind chimes
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I’m not sure about your end correction. I thought for an open pipe it was about d/6 at one end. You have a correction at both ends which would be 0.33d not 0.8d.
But things may be more complicated, because of the vibrations in the pipe may be coupled to the vibrations of the air inside, which will change the frequency.
The practical thing to do is measure the frequencies that you have with a musical instrument tuner, then adjust the lengths as required. Then try to understand what was wrong with the theory!
There seems to be a lot of information about wind chimes here:
http://home.fuse.net/engineering/Chimes.htm