Vibrations of a Magnetostrictive Tube.
TRACOR INC ROCKVILLE MD
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Experiments are described whose purpose is to determine how a ferrite magnetostrictive tubular transducer vibrates when excited through linear processes. To evaluate certain anomolous responses, the vibrations of the ferrite tube are compared to those of a non-magnetostrictive brass tube. Non-symmetrical resonance curves have been observed on the ferrite tube in which the lack of symmetry has been explained on the basis of magnetostrictively coupled modes of vibration. A high resolution ultramicrometer technique is used to measure the vibrational amplitudes along the tube axis and around the tube periphery. The spatial resolution of the ultramicrometer probe is better than 150th of the circumferential distance. Higher order modes can be measured on small diameter tubes than has been previously possible using conventional sensors. Vibrational amplitudes can be measured to 200A. Theories of Arnold and Warburton and Greenspon are used to predict the resonances of each tube. Reasonable agreement is obtained between the measured frequencies of the higher order modes modes up to n 6 and the predicted frequencies. Author
- Electrical and Electronic Equipment