Resonant Properties For Different Materials

materials used: pvc pipe (1" diam., 1/16" wall), copper pipe (5/8" diam., 1/16" wall), aluminum pipe (3/8" diam., 1/16" wall)

Actual Sound Wave Modeled Sound Wave

pvc1.wav

echo command to generate model: (map-chan (echo .003 .65))

pvc2.wav

echo command to generate model: (map-chan (echo .003 .6))

pvc3.wav

echo command to generate model: (map-chan (echo .003 .5))

copper1.wav

echo command to generate model: (map-chan (echo .003 .7))

copper2.wav

echo command to generate model: (map-chan (echo .003 .85))

copper3.wav

echo command to generate model: (map-chan (echo .003 .8))

aluminum1.wav

echo command to generate model: (map-chan (echo .003 .65))

aluminum2.wav

echo command to generate model: (map-chan (echo .003 .7))

aluminum3.wav

echo command to generate model: (map-chan (echo .003 .65))

Summary of echo commands

For pvc pipe:

(map-chan (echo .003 .65))
(map-chan (echo .003 .6))
(map-chan (echo .003 .5))

Avg. attenuation value: .58

For copper pipe:

(map-chan (echo .003 .7))
(map-chan (echo .003 .85))
(map-chan (echo .003 .8))

Avg. attenuation value: .78

For aluminum pipe:

(map-chan (echo .003 .65))
(map-chan (echo .003 .7))
(map-chan (echo .003 .65))

Avg. attenuation value: .67

Conclusions

Copper showed best resonance - surprised that it wasn't aluminum, but it's likely that the small diameter of the aluminum pipe affected the results
Copper and aluminum still showed better resonance than pvc pipe - this was the expected result
Value for time between peaks constant at .003 sec. Makes sense - the same lengths of pipe were used in each case, and the speed of sound does not change for different materials

For Further Testing

It would be interesting to perform the same tests on tubes of equal diameter but different material, as well as same material / different diameters to truly discern the affect that pipe material and diameter have on the results
It would also be interesting to perform these tests on tubes made of different materials, such as wood or glass

	Actual Sound Wave	Modeled Sound Wave
pvc1.wav
	echo command to generate model: (map-chan (echo .003 .65))
pvc2.wav
	echo command to generate model: (map-chan (echo .003 .6))
pvc3.wav
	echo command to generate model: (map-chan (echo .003 .5))
copper1.wav
	echo command to generate model: (map-chan (echo .003 .7))
copper2.wav
	echo command to generate model: (map-chan (echo .003 .85))
copper3.wav
	echo command to generate model: (map-chan (echo .003 .8))
aluminum1.wav
	echo command to generate model: (map-chan (echo .003 .65))
aluminum2.wav
	echo command to generate model: (map-chan (echo .003 .7))
aluminum3.wav
	echo command to generate model: (map-chan (echo .003 .65))