scholarly journals A Cylinder-Type Multimodal Traveling Wave Piezoelectric Actuator

2020 ◽  
Vol 10 (7) ◽  
pp. 2396
Author(s):  
Dalius Mažeika ◽  
Andrius Čeponis ◽  
Daiva Makutėnienė
Keyword(s):  
Piezoelectric Actuator ◽  
Traveling Wave ◽  
Ball Bearing ◽  
Rotation Speed ◽  
Experimental Investigations ◽  
Vibration Modes ◽  
Wave Type ◽  
Bending Vibration ◽  
Piezoceramic Ring ◽  
Electric Signals

Numerical and experimental investigations of a multimodal piezoelectric traveling wave actuator are presented. The actuator consists of a cylindrical stator with a conical hole and piezoceramic rings that are located at the node of the first longitudinal and second bending vibration modes; one piezoceramic ring is also placed at the bottom of the actuator. The actuator is clamped at the bottom using a special supporting cylinder and a ball bearing. Traveling-wave-type vibrations are excited at the top surface of the cylinder by employing a superposition of the first longitudinal and second bending vibration modes of the stator. The conical hole of the stator is used to amplify the vibration amplitudes of the contact surface. Four electric signals with phase difference of π/2 are used to drive the actuator. Numerical and experimental investigations showed that the proposed actuator is able to generate up to 115 RPM rotation speed at constant preload force.

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 Rotary Piezoelectric Actuator Using the Third and Fourth Bending Vibration Modes

2014 ◽  
Vol 61 (8) ◽  
pp. 4366-4373 ◽  
Author(s):  
Yingxiang Liu ◽  
Weishan Chen ◽  
Xiaohui Yang ◽  
Junkao Liu
Keyword(s):  
Piezoelectric Actuator ◽  
Vibration Modes ◽  
Bending Vibration ◽  
The Third

A Bonded-Type Piezoelectric Actuator Using the First and Second Bending Vibration Modes

2016 ◽  
Vol 63 (3) ◽  
pp. 1676-1683 ◽  
Author(s):  
Yingxiang Liu ◽  
Xiaohui Yang ◽  
Weishan Chen ◽  
Dongmei Xu
Keyword(s):  
Piezoelectric Actuator ◽  
Vibration Modes ◽  
Bending Vibration

The Integrated Design of a New Intelligent Fuze Safety System Based on Piezoelectric Actuator

2013 ◽  
Vol 645 ◽  
pp. 381-386
Author(s):  
Hai Peng Chen ◽  
Chao Chen ◽  
Jun Shan Wang
Keyword(s):  
Piezoelectric Actuator ◽  
Longitudinal Vibration ◽  
Integrated Design ◽  
Safety System ◽  
Parameter Design ◽  
Maximum Speed ◽  
Initial Structure ◽  
Vibration Modes ◽  
Final Size ◽  
Bending Vibration

A new intelligent fuze safety system based on a linear piezoelectric actuator is proposed in this paper. The liner actuator utilizes the stator’s first-order longitudinal vibration and second-order bending vibration to drive the slider. According to the initial structure size of fuze safety system, parameter design has been carried out and the actuator’s final size has been determined. The prototype is manufactured and frequency-response experiment shows the two vibration modes can be excited at the same approximately frequency. The speed characteristics of the actuator are measured and the maximum speed of 88.2 mm/s is obtained.

scholarly journals Analysis of a Linear Model for Non-Synchronous Vibrations Near Stall

2021 ◽  
Vol 6 (3) ◽  
pp. 26
Author(s):  
Christoph Brandstetter ◽  
Sina Stapelfeldt
Keyword(s):  
Linear Model ◽  
Linear Models ◽  
Structural Vibration ◽  
Experimental Investigations ◽  
Vibration Modes ◽  
Critical Problem ◽  
Safety Critical ◽  
Unstable Vibration ◽  
Aero Engines ◽  
Lock In

Non-synchronous vibrations arising near the stall boundary of compressors are a recurring and potentially safety-critical problem in modern aero-engines. Recent numerical and experimental investigations have shown that these vibrations are caused by the lock-in of circumferentially convected aerodynamic disturbances and structural vibration modes, and that it is possible to predict unstable vibration modes using coupled linear models. This paper aims to further investigate non-synchronous vibrations by casting a reduced model for NSV in the frequency domain and analysing stability for a range of parameters. It is shown how, and why, under certain conditions linear models are able to capture a phenomenon, which has traditionally been associated with aerodynamic non-linearities. The formulation clearly highlights the differences between convective non-synchronous vibrations and flutter and identifies the modifications necessary to make quantitative predictions.

scholarly journals Vibration of Rotating and Revolving Planet Rings with Discrete and Partially Distributed Stiffnesses

2020 ◽  
Vol 11 (1) ◽  
pp. 127
Author(s):  
Fuchun Yang ◽  
Dianrui Wang
Keyword(s):  
High Speed ◽  
Differential Operators ◽  
Natural Frequencies ◽  
Rotation Speed ◽  
Distribution Area ◽  
Vibration Modes ◽  
Governing Equations ◽  
Vibration Properties ◽  
Wide Range ◽  
Forced Responses

Vibration properties of high-speed rotating and revolving planet rings with discrete and partially distributed stiffnesses were studied. The governing equations were obtained by Hamilton’s principle based on a rotating frame on the ring. The governing equations were cast in matrix differential operators and discretized, using Galerkin’s method. The eigenvalue problem was dealt with state space matrix, and the natural frequencies and vibration modes were computed in a wide range of rotation speed. The properties of natural frequencies and vibration modes with rotation speed were studied for free planet rings and planet rings with discrete and partially distributed stiffnesses. The influences of several parameters on the vibration properties of planet rings were also investigated. Finally, the forced responses of planet rings resulted from the excitation of rotating and revolving movement were studied. The results show that the revolving movement not only affects the free vibration of planet rings but results in excitation to the rings. Partially distributed stiffness changes the vibration modes heavily compared to the free planet ring. Each vibration mode comprises several nodal diameter components instead of a single component for a free planet ring. The distribution area and the number of partially distributed stiffnesses mainly affect the high-order frequencies. The forced responses caused by revolving movement are nonlinear and vary with a quasi-period of rotating speed, and the responses in the regions supported by partially distributed stiffnesses are suppressed.

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.

ANALYSIS AND SYNTHESIS OF RADIATION PATTERNS FROM CIRCULAR APERTURES

1960 ◽  
Vol 38 (1) ◽  
pp. 78-99 ◽  
Author(s):  
A. Ishimaru ◽  
G. Held
Keyword(s):  
Radiation Pattern ◽  
Traveling Wave ◽  
Design Method ◽  
Source Distribution ◽  
Circular Aperture ◽  
Narrow Beam ◽  
Wave Type ◽  
Numerical Examples ◽  
Analysis And Synthesis ◽  
Improved Design

Part I considers the problem of determining the source distribution over a circular aperture required to produce a prescribed radiation pattern. In particular, the problem of optimizing the narrow broadside pattern from a circular aperture is discussed in detail and an improved design method over Taylor's for line source is devised. Numerical examples are given.Part II deals with the analysis of the radiation pattern from a circular aperture from γ1 to γ2 with the traveling wave type source functions. Expressions suitable to the analysis and the synthesis are obtained and the narrow-beam and shaped-beam synthesis are discussed.

Application of superconducting striplines to traveling-wave type LiNbO/sub 3/ optical modulator

1993 ◽  
Vol 3 (1) ◽  
pp. 2792-2795 ◽  
Author(s):  
K. Yoshida ◽  
K. Ikeda ◽  
K. Saito ◽  
Y. Kanda
Keyword(s):  
Traveling Wave ◽  
Optical Modulator ◽  
Wave Type
Sign in / Sign up

Export Citation Format

Share Document