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Ok, sorry to leave this for so long.
I need to clarify my statements a little bit. When I said I think that I think similar products are going to test similarly, I mean that products that have a 4mil thick aluminum layer, and 1.5-2mm thick butyl layer are going to test almost identical. I do however think that a product with a 8-10mil thick layer of aluminum will test differently than the products with 4mil thick aluminum. Then theres the asphalt products and the stuff from STP, which is very different than all of the other products. Of course, this is just my hunch, and could be proven wrong. But I wanted to put it out there.
The resonant frequency of the metal on the first test made it very difficult to measure at a wide range of frequencies. This is bare metal, no deadening. I was actually unable to get anything out of it except at 100hz. That tells me the Q of the resonant frequency is very high, something I will have to investigate more. After I added deadener, I was able to measure at both 80hz and 100hz, telling me that the Q flattened out a little, but it also showed a very direct decrease in vibration. I'll be able to quantify it later once I get the equation from the accelerometer manufacturer, but the peak to peak voltage almost halved from bare metal, to deadened.
Like rton20s said, its not going to be possible to compare these results to in vehicle results with an equation. That's why this is just the beginning. There are plans to go much much farther in depth than the simple testing done here between brands, including real world car tests. That's why its so important to me to be able to automate these tests as much as possible.
I will get some video up later today of everything running, I have to get some things done. But I will get it up tonight.
I need to clarify my statements a little bit. When I said I think that I think similar products are going to test similarly, I mean that products that have a 4mil thick aluminum layer, and 1.5-2mm thick butyl layer are going to test almost identical. I do however think that a product with a 8-10mil thick layer of aluminum will test differently than the products with 4mil thick aluminum. Then theres the asphalt products and the stuff from STP, which is very different than all of the other products. Of course, this is just my hunch, and could be proven wrong. But I wanted to put it out there.
The resonant frequency of the metal on the first test made it very difficult to measure at a wide range of frequencies. This is bare metal, no deadening. I was actually unable to get anything out of it except at 100hz. That tells me the Q of the resonant frequency is very high, something I will have to investigate more. After I added deadener, I was able to measure at both 80hz and 100hz, telling me that the Q flattened out a little, but it also showed a very direct decrease in vibration. I'll be able to quantify it later once I get the equation from the accelerometer manufacturer, but the peak to peak voltage almost halved from bare metal, to deadened.
Like rton20s said, its not going to be possible to compare these results to in vehicle results with an equation. That's why this is just the beginning. There are plans to go much much farther in depth than the simple testing done here between brands, including real world car tests. That's why its so important to me to be able to automate these tests as much as possible.
I will get some video up later today of everything running, I have to get some things done. But I will get it up tonight.