Motion Characteristics of Loop Type Elliptic Resonator
Tohru Sasaki, Kunio Koizumi, and Motofumi Sasaki
Graduate School of Science and Engineering, Toyama University, 3190 Gofuku, Toyama 930-8555, Japan
Received:April 20, 2007Accepted:June 27, 2007Published:February 20, 2008
Keywords:dynamics of machinery, vibration of mechanism, forced vibration, piezo-element
This paper deals with characteristics of the elliptic resonator. The resonator consists of loop and leg part, respectively. Each part was actuated by bimorph type piezoelectric member. The deflection of loop part and the bending of leg part generated by piezoelectric bimorphs makes an elliptic motion at the center point of the upper member. If resonators are put in a train and are actuated at the same frequency, it can feed objects on the upper surface of its train. There are two type of resonator, arch type and pentagonal type. Arch type resonator generates big amplitude on the center of upper surface. Bending its under member, pentagonal type resonator generates amplitude on the whole upper surface. Calculated results show that a shape of resonator influences on natural modes and natural frequencies. The trial one could generate elliptic motion in arbitrary phase with both type resonator. A pentagonal type resonator with notch reinforces its torsional stiffness and can generate necessary natural modes and an elliptic vibration without generating other natural modes.
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