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Oct 17th, 2019
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  1. Acoustics Experiment #1
  2. Thomas Miritello
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  4. For my experiment, I worked with Aron Kobayashi Ritch and Trevor Rivkin using a 12” Wuhan china cymbal. Our independent variable for determining loudness was the height at which we dropped the china cymbal – we used 6 inch increments of height to drop the cymbal from onto a carpet-on-linoleum floor, which I would subjectively describe as being firm and pretty hard, but certainly with some dampening from the high surface area. We also tested the cymbal being dropped from the same height with 2” x 3” rectangles of Pro-Gaff black gaffer’s tape being placed on the inner rim of the cymbal.
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  6. First, we must observe the shape of the cymbal and how we attempted to drop it consistently throughout our testing. Here is an approximated cross section I’ve drawn, as well as a picture of the same model of cymbal from LoneStarPercussion:
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  9. The takeaway here is that the cymbal does not have much contact with the ground when it is dropped, only essentially hitting on the circle that is formed by the flanged edge of the cymbal. Also, the cymbal is not balanced due to the fact that they are hand-hammered by the manufacturer – one side may have more surface contact with the ground, so getting a consistent drop is key as the loudness could potentially vary. When placing tape on the cymbal, we put the tape on the top of this inner circle as that is where the muffling would be the most effective as that is where the initial contact with the ground is made.
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  11. Our expectation was that the cymbal would increase in loudness from higher heights, keeping the ∆E α v2 proportion as a hypothetical model, expecting that the loudness would increase logarithmically as we increase velocity (roughly proportional to height) linearly. Physically, the setup for our experiment was using an NTI Acoustilyzer with an NTI SPL mic placed roughly 1.85 meters away from the impact zone on the ground that the cymbal would be making contact with. We also had a tape measure (listed in inches) that we used to determine the heights to drop our cymbal from.
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