Effect of Boundary Conditions on the Damping Characterstics of a Randomly Excited Cast Nickel-Aluminum Bronze Specimen at Low Stress Levels.
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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This research examines how various specimen and support arrangements affect a materials damping characteristics. The 74 lb. sample studied is cast nickel-aluminum bronze and measures 19.8 x 13.65 x 1 inches. Using previously documented Naval Postgraduate School research, desired random vibration analysis has been verified by impulse hammer techniques. Input excitation is generator system and response is recorded through the use of piezoelectric accelerometers. The frequency range studied varies from 100 Hertz to 12,5000 Hertz. The vibration generator is threaded into the specimen and the accelerometers are attached to the machined surface of the sample with a cyanoacry-late adhesive. Boundary support conditions include various foam bolted and shock-cord configurations.