Ueha school papers

Recent development of ultrasonic actuators: A phenomenon of near-field acoustic levitation (NFAL) in air has been successfully applied to non-contact transportation where planar objects of several kilograms in weight are levitated and transported. The characteristics of NFAL in air was again studied, because some peculiar characteristics were found in underwater NFAL in which an attractive a....; Authors:Ueha;S.Publisher:Ultrasonics Symposium;2001 IEEEConference Date:7-10 Oct. 2001ISSN:0-7803-7177-1Total Page:2 vol. 1754

Ultrasonic motors: An ultrasonic motor is proposed which uses two piezoelectric elements in the stator. One element is used to generate a vibration polarized with respect to the direction of motion of the rotor or the slider. The other one generates a vibration perpendicular to the motion of the rotor. By imaging the ratio of the vibration amplitudes and the phase, t....; Authors:Ueha;S.;Kurosawa;M.Publisher:Ultrasonics Symposium;1988. Proceedings.;IEEE 1988Conference Date:2-5 Oct. 1988ISSN:Total Page:2 vol. 1113

Performances of a hybrid transducer-type ultrasonic motor as a function of the size: In this report, the characteristics of a hybrid transducer-type ultrasonic motor are summarized as a function of the size. First, the diameter dependence of torque and no-load speed is discussed theoretically. Second, it is investigated experimentally by using trial made motors with diameters range from 5 mm to 80 mm. Based on the results, the keys....; Authors:Nakamura;K.;Ueha;S.Publisher:Ultrasonics Symposium;1994. Proceedings.;1994 IEEEConference Date:1-4 Nov. 1994ISSN:0-7803-2012-3Total Page:3 vol. 1911

Hybrid transducer type ultrasonic motor: A type of ultrasonic motor whose stator is composed of a torsional vibrator and multilayered piezoelectric actuators is proposed and has been fabricated for trial. The stator is operated at the resonance frequency of the torsional vibration. The vibrator generates the mechanical output force and the actuators control the frictional force. The const....; Authors:Kurosawa;M.;Ueha;S.Publisher:Ultrasonics;Ferroelectrics and Frequency Control;IEEE Transactions onConference Date:ISSN:0885-3010Total Page:

Characteristics estimation of a traveling wave type ultrasonic motor: A method for calculating the load characteristics of a traveling-wave-type ultrasonic motor (TWUM) is proposed. A systematic method using an equivalent circuit is suggested for estimating the performance of the motor, including its electrical and the mechanical parts. In the proposed method, a governing equation for the motor is derived to describe....; Authors:Hirata;H.;Ueha;S.Publisher:Ultrasonics;Ferroelectrics and Frequency Control;IEEE Transactions onConference Date:ISSN:0885-3010Total Page:

Design of a traveling wave type ultrasonic motor: The purpose of the present paper is to establish a method of design for a traveling wave type ultrasonic motor. This method is based on two models for the ultrasonic motor. A two-dimensional elastic contact model is used for estimating the friction drive between the rotor and vibrator of the motor. Moreover, an electrical equivalent circuit is used....; Authors:Hirata;H.;Ueha;S.Publisher:Ultrasonics;Ferroelectrics and Frequency Control;IEEE Transactions onConference Date:ISSN:0885-3010Total Page:

Numerical analysis of the property of a hybrid transducer type ultrasonic motor: A hybrid-transducer-type ultrasonic motor is analyzed numerically. The analysis model is based on the equivalent circuit expression of the longitudinal motion and torsional motion of the stator transducer and the rotor. In these equivalent circuits, the compliance of the contact regions is taken into account, in both the longitudinal and the shear ....; Authors:Kurosawa;M.;Nakamura;K.;Ueha;S.Publisher:Ultrasonics Symposium;1990. Proceedings.;IEEE 1990Conference Date:4-7 Dec. 1990ISSN:Total Page:3 vol. 1673

Tissue hardness measurement using the radiation force of focused ultrasound: A technique for measuring hardness in which the impulsive radiation force is focused ultrasound is used to generate localized deformation of the tissue and the applied force and/or the deformation are measured as a function of time by a conventional pulse-echo technique is proposed. An attempt is made to derive some characteristic values from the c....; Authors:Sugimoto;T.;Ueha;S.;Itoh;K.Publisher:Ultrasonics Symposium;1990. Proceedings.;IEEE 1990Conference Date:4-7 Dec. 1990ISSN:Total Page:3 vol. 1673

Characteristics of a noncontact ultrasonic motor using acoustic levitation: This paper presents the experimental and theoretical considerations on characteristics of a noncontact ultrasonic motor with an acoustically levitated rotor. The results can be used to optimize the motor design. It is shown that a linear relation between the revolution speed and the stator vibration velocity exists. The revolution speed can be incr....; Authors:Jun Hui Hu;Nakamura;K.;Ueha;S.Publisher:Ultrasonics Symposium;1996. Proceedings.;1996 IEEEConference Date:3-6 Nov. 1996ISSN:0-7803-3615-1Total Page:2 vol. 1622

A Traveling-Wave Linear Piezoelectric Actuator with Enclosed Piezoelectric Elements---The: Authors:Friend;J.R.;Nakamura;K.;Ueha;S.Publisher:Advanced Intelligent Mechatronics. Proceedings;2005 IEEE/ASME International Conference onConference Date:July 24-28;2005ISSN:0-7803-9047-4Total Page:

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