![]() ![]() The silicone will now be the "sink" for some of the energy in a rattling fender.Īll of these sticky mat materials use this principle to manage sound. Another simple example: Blob a fat dollop of silicone caulk on the back of the fender where your hand was. Your hand has a much lower resonant frequency, so you didn't hear it as much. ![]() Some of the energy that would have caused the fender to rattle just went into the flat hand on the back. Now, place the other hand flat against the rear of the panel and rap again. As a simple example: rap your knuckles on the flat part of your quarter panel. ![]() When the primary object (metal fender) vibrates, that energy is captured by the attached material, and converted to the lower resonant frequency of that material. Here, rather than simply using thicker metal for your fender, you attach a specific material that has a VERY low resonant frequency (usually below the audible range). The term mass loading typically refers to a specific technique. thus requiring more mechanical energy to generate similar sound levels- or said in reverse, for the same amount of mechanical energy input, less sound. Increasing the mass of an object, in a generic sense, tends to reduce resonant frequency by simply adding density (use thicker sheetmetal for a fender, use brick instead of vinyl siding on the house, your other friend with the thicker skull, etc.). It is mechanical energy being converted into sound (and heat). The resonant frequency for that interaction is what you hear. Rap your knuckles on a fender, the side of your house, your friend's skull, whatever. Everything in the world has a resonant frequency. ![]()
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