Effect of boundary conditions on the damping characteristics of a randomly excited cast nickel-aluminum bronze specimen at low stress levels.
This research examines how various specimen support arrangements affect a material's 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 provided by a combination piezoelectric-electromagnetic vibration generator system and response is recorded through the use of piezoelectric accelerometers . The frequency range studied varies from 100 Hertz to 12,500 Hertz. The vibration generator is threaded into the specimen and the accelerometers are attached to the machined surface of the sample with a cyanoacrylate adhesive. Boundary support conditions include various: foam, bolted and shock-chord configurations.
Networked Digital Library of Theses and Dissertations
Monterey, California. Naval Postgraduate School