Why So Cereal? 5,000+ posts
Invisible Cereal
I knew the test was crap lol. It was a last minute idea I got and just went with it. Like I said, about an hour of work.your test was quite flawed... you mostly measured barrier effects and transmission loss. a dB meter is not acceptable for that test as you cannot resolve the amplitude of each frequency being tested. to truly evaluate deadener you need accelerometers or the ability to measure resonance frequency of materials with a narrow band RTA (our narrow band measurements have 1Hz resolution). having the mic in a fixed position means you were also measuring room modes and phase interference that would not be noticeable with a dB meter. nothing in that test allows you to evaluate the elastomeric and viscoelastic properties of deadener. your judges knew nothing about acoustics... i would have given you an "F". //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
science fairs aren't about science, they are about self-marketing and speaking skills.
Our senior projects had to be presented as well, and being that the people grading probably didn't know much about it either, it sounded smart to them and I went with it. Haha