A Single Piezoelectric Trimorph Driven Bi-Directional Linear Ultrasonic Motor

2007 ◽  
Author(s):  
Tung-Li Wu ◽  
Chen-Hui Yang ◽  
Shuo-Hung Chang
Keyword(s):  
Resonant Frequency ◽  
Cellular Phone ◽  
Static Friction ◽  
Ultrasonic Motor ◽  
Published Data ◽  
Bending Vibration ◽  
Linear Ultrasonic Motor ◽  
Modes Of Vibration ◽  
Motor Operation ◽  
The Right

The design of using a single piezoelectric (PZT) trimorph actuator ultrasonically to drive a slider for two directional motions is reported. The working principle is the use of the resonant vibration induced force provided by the PZT trimorph driven at the specific frequency. In contact with a slider, the trimorph’s force overcomes the static friction of the slider and pushes the slider moving in one direction. The backward motion of the slider is achieved similarly by the different vibration mode of the PZT trimorph operated at the different resonant frequency. The merit of this work is the design of the rectangular PZT trimorph and its modes of vibration. The 3 mm by 9 mm rectangular trimorph was made of a 50 microns thick copper layer laminated with a 175 microns thick PZT layer on each face. As for ultrasonic motor operation, only one long edge of the trimorph was clamped. When the PZT layers were driven electrically at its resonant frequency and at the right phase, the PZT’s in-plane extensional vibration will turn into bending vibration. With extensive modal analysis in the Finite Element modeling, the 3:1 ratio of the length to width of the trimorph was found for the best performances. Both resonant frequencies and associated vibration modes were all identified. The performance of the prototype was experimentally evaluated by using laser interferometer and spectrum analyzer. Under 10 Vpp and 0.5 N preload, the measurement results show that the motor achieved the velocity of 200 mm/s and generated force of 0.1 N. If we divided the generated force and the slider velocity by the motor volume, the ultrasonic motor achieved the specific force of 3,282,447 3N/m3 and the specific velocity of 4,106,280 1/m2s, respectively. Comparing with the published data, the specific velocity in this study is 100 times larger. The results in this work are suitable for applications in auto-focusing and zooming lens in cellular phone camera.

Research of a Ring-Type Linear Ultrasonic Motor

2011 ◽  
Vol 211-212 ◽  
pp. 254-258
Author(s):  
Jun Kao Liu ◽  
Wei Shan Chen ◽  
Zhen Yu Xue
Keyword(s):  
Traveling Wave ◽  
Transient Analysis ◽  
Ultrasonic Motor ◽  
Maximum Speed ◽  
Vibration Modes ◽  
Bending Vibration ◽  
Ring Type ◽  
Linear Ultrasonic Motor ◽  
Working Principle ◽  
Elliptical Motion

A new ring-type linear ultrasonic motor is proposed in this study. In this new design, bending vibration traveling wave is generated in a long ring by two groups of PZT ceramics bonded on the inner sides of the linear beams. Elliptical trajectory motions can be formed at particles on the teeth, which can realize the linear driving by frictional force. The working principle of the proposed design is introduced. Two bending vibration modes that have a phase difference of 90deg on space are analyzed. The elliptical motion trajectory of node on the tooth gained by the transient analysis verifies the excitation of bending traveling wave. A prototype motor is fabricated and measured, and a maximum speed of 15mm/s is reached.

A High-Power Linear Ultrasonic Motor Using Bending Vibration Transducer

2013 ◽  
Vol 60 (11) ◽  
pp. 5160-5166 ◽  
Author(s):  
Yingxiang Liu ◽  
Weishan Chen ◽  
Junkao Liu ◽  
Xiaohui Yang
Keyword(s):  
High Power ◽  
Ultrasonic Motor ◽  
Bending Vibration ◽  
Vibration Transducer ◽  
Linear Ultrasonic Motor

Design and Analysis of a Linear Ultrasonic Motor with Composite Bending and Torsional Vibration Modes

2014 ◽  
Vol 945-949 ◽  
pp. 1327-1332 ◽  
Author(s):  
He Long Wang ◽  
Wei Shan Chen ◽  
Jun Kao Liu
Keyword(s):  
Torsional Vibration ◽  
Transient Analysis ◽  
Structural Parameters ◽  
Ultrasonic Motor ◽  
Vibration Modes ◽  
Bending Vibration ◽  
First Order ◽  
Linear Ultrasonic Motor ◽  
New Type ◽  
Working Principle

A new type linear ultrasonic motor using Second-order bending and First-order torsional modes (2B-1T) is proposed. The ultrasonic motor has two driving feet and the continuous linear motions of sliders are realized by the frictional force between stator and sliders. In this new design, bending vibration is excited by d33 mode, which controls the preload pressure, and torsional vibration is excited by d15 mode, which generates the driving force. The elliptical trajectories of both feet are achieved, when the phase difference of the two modes is 90° in time and space. The working principle of ultrasonic motor using 2B-1T is simulated. A parametric model of the stator is designed. The sensitive analyses of structural parameters are gained with modal analysis. The characteristics and trajectories of driver feet are studied by transient analysis. These results can provide theoretical basis for the development of this new type ultrasonic motor.

A Linear Ultrasonic Motor Using Bending Vibration Transducer with Double Driving Feet

2010 ◽  
Vol 400 (1) ◽  
pp. 221-230 ◽  
Author(s):  
Weishan Chen ◽  
Yingxiang Liu ◽  
Junkao Liu ◽  
Shengjun Shi
Keyword(s):  
Ultrasonic Motor ◽  
Bending Vibration ◽  
Vibration Transducer ◽  
Linear Ultrasonic Motor

A Two-Feet Linear Ultrasonic Motor for Fuze Safety System

2013 ◽  
Author(s):  
Y. J. Tang ◽  
J. Wang
Keyword(s):  
Mechanical Performance ◽  
Longitudinal Vibration ◽  
Ultrasonic Motor ◽  
Two Phase ◽  
Bending Vibration ◽  
Convex Part ◽  
Linear Ultrasonic Motor ◽  
Oscillation Modes ◽  
Frequency Sweep Test ◽  
The Brain

In modern weapons systems, fuze is known as the “brain” of the ammunition, whose performance will directly affect the combat effectiveness. It guarantees the safety of ammunition during the logistical processing and makes the ammunition reliably function after launch. In the fuze system, the delay arming device is closely related to the fuze performance and safety reliability, which affects the muzzle safety distance. After years of development, the performance of delay arming device has been developed and improved, but malignant accidents such as explode in the chamber, early burst and dud have occurred from time to time. This paper investigated a standing wave linear ultrasonic motor applied to the fuze delay arming device as the arming actuator. The motor is made up of a cuboid with two drive feet and a slider with a convex part, both having a through hole. The first order longitudinal vibration and second order bending vibration of the stator were selected as working modes. The prototype was fabricated and the vibration mode test was carried out, indicating the motor can generate two-phase required oscillation modes. The frequency sweep test was also performed and two-phase frequency is proved quite close. The experiments on the motor mechanical performance were done, and the speed of the motor is 88.2 mm/s, furthermore the reciprocating motion of the slider is flexible.

Analysis of a Linear Ultrasonic Motor Using L-B Hybrid Transducer

2011 ◽  
Vol 211-212 ◽  
pp. 747-751
Author(s):  
Jun Kao Liu ◽  
Ying Xiang Liu ◽  
Wei Shan Chen ◽  
Sheng Jun Shi
Keyword(s):  
Driving Forces ◽  
Ultrasonic Motor ◽  
Bending Vibrations ◽  
Bending Vibration ◽  
Resonant Frequencies ◽  
Motion Trajectories ◽  
Linear Ultrasonic Motor ◽  
Fem Method ◽  
Frictional Forces ◽  
Elliptical Motion

In this study, a linear ultrasonic motor using longitudinal and bending hybrid transducer is proposed, which contains two exponential shape horns located on two ends, and the end tips of the horns are used as the driving feet. Two groups of bending PZT ceramics are set in the middle of the transducer, and two groups of longitudinal PZT are set between the bending PZT and two horns, respectively. In this new design, longitudinal and bending vibrations of the transducer are composing and formed elliptical trajectory vibrations on the two end tips of the horns. The runners are in contact with the end tips of the horns, and the driving forces are the frictional forces between the runners and the driving tips. By using FEM method, the longitudinal and bending vibration modes are gained, and the corresponding resonant frequencies are tuned to realize the modal degeneration. At last, transient analysis is developed to gain the vibration trajectories of the driving tips, and elliptical motion trajectories are observed to be formed, which verify the feasibility of the proposed design.

It is better an approximate answer to the right question than the exact answer to the wrong question : the case of the psychometric analysis of the ASQ:SE

2020 ◽  
Author(s):  
Luis Anunciacao ◽  
janet squires ◽  
J. Landeira-Fernandez
Keyword(s):  
Internal Structure ◽  
Statistical Methods ◽  
Principal Component ◽  
Psychological Theory ◽  
Published Data ◽  
Multivariate Statistical ◽  
Exact Answer ◽  
Wide Range ◽  
Ages And Stages Questionnaire ◽  
The Right

One of the main activities in psychometrics is to analyze the internal structure of a test. Multivariate statistical methods, including Exploratory Factor analysis (EFA) and Principal Component Analysis (PCA) are frequently used to do this, but the growth of Network Analysis (NA) places this method as a promising candidate. The results obtained by these methods are of valuable interest, as they not only produce evidence to explore if the test is measuring its intended construct, but also to deal with the substantive theory that motivated the test development. However, these different statistical methods come up with different answers, providing the basis for different analytical and theoretical strategies when one needs to choose a solution. In this study, we took advantage of a large volume of published data (n = 22,331) obtained by the Ages and Stages Questionnaire Social-Emotional (ASQ:SE), and formed a subset of 500 children to present and discuss alternative psychometric solutions to its internal structure, and also to its subjacent theory. The analyses were based on a polychoric matrix, the number of factors to retain followed several well-known rules of thumb, and a wide range of exploratory methods was fitted to the data, including EFA, PCA, and NA. The statistical outcomes were divergent, varying from 1 to 6 domains, allowing a flexible interpretation of the results. We argue that the use of statistical methods in the absence of a well-grounded psychological theory has limited applications, despite its appeal. All data and codes are available at https://osf.io/z6gwv/.

Clinical Case: Complications after Endovascular Treatment of Intracranial Aneurysm in a Patient after Subarachnoid Hemorrhage

2020 ◽  
Vol 8 (1) ◽  
pp. 9-15
Author(s):  
Petrov Nikolay ◽  
◽  
Marinova R. ◽  
Odiseeva Ev.
Keyword(s):  
Intracranial Aneurysm ◽  
Endovascular Treatment ◽  
Clinical Case ◽  
Endovascular Coiling ◽  
Published Data ◽  
Military Medical Academy ◽  
Life Threatening ◽  
Arachnoid Hemorrhage ◽  
The Right ◽  
Brain Artery

Abstract: Intracranial aneurysm is one of the most common neurovascular complications. During the recent years the accepted treatment of enraptured cranial aneurysm is noninvasive endovascular coiling. This technique is modern but it is not without complications which can be serious and life-threatening. A clinical case of a patient admitted to the ICU of Military Medical Academy - Sofia with sub arachnoid hemorrhage is described. After a positive clinical course, the check-up magnetic resonance showed intracranial aneurism of the right carotid artery. The patient underwent angiographic endovascular treatment. Vasospasm of the middle and right brain artery and thrombosis were detected during the procedure. Attempt of thromboaspiration was made without success. This article reviews published data on broad-spectrum researches concerning complications of endovascular coiling of intracranial aneurysms and the ways to prevent and reduce them.

scholarly journals A novel linear ultrasonic motor with dual sliders

AIP Advances ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 025238
Author(s):  
Danhong Lu ◽  
Qiuxiang Lin ◽  
Yanxiang Han ◽  
Bingxun Chen ◽  
Chunrong Jiang ◽  
...  
Keyword(s):  
Ultrasonic Motor ◽  
Linear Ultrasonic Motor

scholarly journals Design and Performance Evaluation of a Single-Phase Driven Ultrasonic Motor Using Bending-Bending Vibrations

Micromachines ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 853
Author(s):  
Dongmei Xu ◽  
Wenzhong Yang ◽  
Xuhui Zhang ◽  
Simiao Yu
Keyword(s):  
Single Phase ◽  
Oblique Line ◽  
Ultrasonic Motor ◽  
Vibration Modes ◽  
Bending Vibrations ◽  
Bending Vibration ◽  
Output Performance ◽  
Resonance Frequencies ◽  
And Performance ◽  
Line Trajectory

An ultrasonic motor as a kind of smart material drive actuator has potential in robots, aerocraft, medical operations, etc. The size of the ultrasonic motor and complex circuit limits the further application of ultrasonic motors. In this paper, a single-phase driven ultrasonic motor using Bending-Bending vibrations is proposed, which has advantages in structure miniaturization and circuit simplification. Hybrid bending vibration modes were used, which were excited by only single-phase voltage. The working principle based on an oblique line trajectory is illustrated. The working bending vibration modes and resonance frequencies of the bending vibration modes were calculated by the finite element method to verify the feasibility of the proposed ultrasonic motor. Additionally, the output performance was evaluated by experiment. This paper provides a single-phase driven ultrasonic motor using Bending-Bending vibrations, which has advantages in structure miniaturization and circuit simplification.

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