Optimal Design of Piezoelectric Actuator for Precision Positioning Applications

2014 ◽  
Vol 625 ◽  
pp. 224-229
Author(s):  
Lien Kai Chang ◽  
Mi Ching Tsai
Keyword(s):  
Piezoelectric Actuator ◽  
Vibration Mode ◽  
Piezoelectric Actuators ◽  
Resonance Vibration ◽  
Precision Positioning ◽  
Positioning Accuracy ◽  
Positioning Systems ◽  
Measurement Systems ◽  
Optimal Efficiency ◽  
Elliptical Motion

Recent advances in measurement systems require positioning systems with high stiffness, accuracy and speed. Piezoelectric actuators which are featured with mechanical simplicity, quick response, and electromagnetic immunity, are often used in precision positioning. It is known that piezoelectric actuators can achieve high positioning accuracy by the stepping mode but low speed. By contrast, the resonance vibration mode will offer high positioning speed, but sacrifices the high inherent position resolution. For the stepping mode, the displacement of the piezoelectric actuator significantly affects the speed, of which larger displacement induces higher speed. For the resonance vibration mode, an elliptical motion of the piezoelectric actuator tip is generated by horizontal and vertical eigenmodes, and the optimal efficiency can be achieved when the two eigenmodes are operated at the same frequency. For the applications of high positioning accuracy and speed, a piezoelectric actuator should be designed by taking these two operation modes into consideration simultaneously. Based on these requirements, the optimal structural dimensions of a piezoelectric actuator are obtained using a genetic algorithm.

Hardware Structures for High Precision Pneutronic Systems

2014 ◽  
Vol 658 ◽  
pp. 541-546 ◽  
Author(s):  
Mihai Avram ◽  
Victor Constantin ◽  
Constantin Bucşan ◽  
Daniel Besnea ◽  
Alina Spanu
Keyword(s):  
High Precision ◽  
Weight Ratio ◽  
Nonlinear Behavior ◽  
Compressed Air ◽  
Power Weight ◽  
Precision Positioning ◽  
Positioning Accuracy ◽  
Large Power ◽  
Pneumatic Actuators ◽  
Positioning Systems

Pneutronic systems come with a series of advantages that are natural to working with compressed air, such as the large power/weight ratio of pneumatic actuators, easy and affordable installation and maintenance as well as being clean working systems. However, due to working with compressed air, there are a series of issues, such as static and transient nonlinear behavior, mostly due to the high compressibility of air. Thus, the behavior of such systems is hard to control, especially in terms of precision positioning. The paper deals with proposing three hardware configurations of pneutronic positioning systems in order to assure the imposed positioning accuracy in the presence of disturbances and the preservation in time of the obtained position.

Modeling of Piezoelectric Actuator Based Nano-Positioning System Using Multi-Polynomial Regression with C1 Continuity

2007 ◽  
Vol 339 ◽  
pp. 434-441 ◽  
Author(s):  
S. Tse ◽  
Y. Gao
Keyword(s):  
Piezoelectric Actuator ◽  
Polynomial Regression ◽  
Piezoelectric Actuators ◽  
Zero Order ◽  
Positioning System ◽  
Modeling Error ◽  
Order Continuity ◽  
Positioning Systems ◽  
First Order ◽  
Command Signals

For nano-positioning systems with piezoelectric actuators used for dynamic grinding control, sinusoidal command signals will used and will give additional problems compared with the commonly used step signals because of the hysteresis effects, which require a good modeling approach. The proposed approach of multiple polynomial regression with first order continuity gives a relative modeling error of 2.65%. The method reduces the error by 26.3-80.2% in comparison with the methods using the single, dual, and multiple polynomial regression with zero order continuity.

scholarly journals A Novel Bionic Piezoelectric Actuator Based on the Walrus Motion

2021 ◽  
Author(s):  
Jianping Li ◽  
Junjie Cai ◽  
Nen Wan ◽  
Yili Hu ◽  
Jianming Wen ◽  
...  
Keyword(s):  
Piezoelectric Actuator ◽  
High Performance ◽  
Experimental System ◽  
Piezoelectric Actuators ◽  
Experimental Results ◽  
Maximum Speed ◽  
Vertical Load ◽  
Positioning Systems ◽  
The Real ◽  
Set Up

AbstractA novel bionic piezoelectric actuator based on the walrus motion to achieve high performance on large working stroke for micro/nano positioning systems is first proposed in this study. The structure of the proposed walrus type piezoelectric actuator is described, and its motion principle is presented in details. An experimental system is set up to verify its feasibility and explore its working performances. Experimental results indicate that the proposed walrus type piezoelectric actuator could realize large working stroke with only one driving unit and one coupled clamping unit; the maximum stepping displacement is ΔLmax = 19.5 μm in the case that the frequency f = 1 Hz and the voltage U = 120 V; the maximum speed Vmax = 2275.2 μm · s−1 when the frequency f = 900 Hz and the voltage U = 120 V; the maximum vertical load mmax = 350 g while the voltage U = 120 V and the frequency f = 1 Hz. This study shows the feasibility of mimicking the bionic motion of the real walrus animal to the design of piezoelectric actuators, which is hopeful for the real application of micro/nano positioning systems to achieve large working stroke and high performance.

Design of a Precision Linear-Rotary Positioning Actuator

2006 ◽  
Vol 18 (6) ◽  
pp. 803-807 ◽  
Author(s):  
Wei Gao ◽  
◽  
Shinji Sato ◽  
Yasumasa Sakurai ◽  
Satoshi Kiyono
Keyword(s):  
Piezoelectric Actuator ◽  
Piezoelectric Actuators ◽  
Rotary Motion ◽  
Maximum Speed ◽  
Sinusoidal Voltage ◽  
Precision Positioning ◽  
Revolution Speed ◽  
Long Stroke ◽  
Ceramic Cylinder

We designed a prototype linear-rotary (<I>Z</I>-θ) dual-axis actuator for precision positioning in which an aluminum rotor (moving element) moves along and rotates around the axis (<I>Z</I>) of a ceramic cylinder (drive rod). The <I>Z</I>-θ actuator consists of a <I>Z</I>-piezoelectric actuator (<I>Z</I>-PZT) (maximum stroke: 12µm) for linear <I>Z</I>-motion, two θ-piezoelectric actuators (θ-PZTs) (maximum stroke: 9.1µm) for rotational θ-motion, a drive rod, and a rotor. θ-PZTs are attached to the drive rod via a clamp. The rotor’s inner side contacts the drive rod with a certain friction. <I>Z</I>-axis positioning uses a smooth impact drive to achieve a long stroke by applying periodic saw-toothed voltage to the <I>Z</I>-PZT. Sinusoidal voltage is applied to θ-PZTs for rotary positioning, not based on a smooth impact drive. The prototype actuator stroke along the <I>Z</I>-axis, limited by the drive rod length, is 10mm and rotary motion is unrestricted. Positioning resolution is a few nanometers and maximum speed in the <I>Z</I>-direction is approximately 2.4mm/s. The maximum revolution speed is 50rpm.

scholarly journals Design and Fabrication of the Large Thrust Force Piezoelectric Actuator

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Shyang-Jye Chang ◽  
Jing Chen
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Piezoelectric Actuator ◽  
Vibration Mode ◽  
Thrust Force ◽  
Piezoelectric Actuators ◽  
Design Parameters ◽  
Analysis Software ◽  
Element Analysis ◽  
Length Width

This paper presents a novel piezoelectric actuator containing double pushers. By using finite element analysis software, this study simulated the vibration mode and amplitude of piezoelectric actuators. The Taguchi method was used to design the parameters of piezoelectric actuators including length, width, height, and electrodes setting. This paper also presents a discussion regarding the influence that the design parameters had on the actuator amplitudes. Based on optimal design parameters, a novel piezoelectric actuator containing double pushers is produced and some thrust tests are also carried out. From the experiment results, the piezoelectric actuator containing double pushers can provide a greater thrust force than that of traditional actuators containing a single pusher as the preload is greater. Comparing with the traditional actuators, the thrust force of new actuator can be increased by 48% with the double preload.

scholarly journals Development of a Novel 2-DOF Rotary–Linear Piezoelectric Actuator Operating under Hybrid Bending–Radial Vibration Mode

Micromachines ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 728
Author(s):  
Andrius Čeponis ◽  
Dalius Mažeika ◽  
Daiva Makutėnienė
Keyword(s):  
Piezoelectric Actuator ◽  
Degrees Of Freedom ◽  
Printed Circuit Board ◽  
Vibration Mode ◽  
Contact Point ◽  
Electrical Signal ◽  
Circuit Board ◽  
Contact Friction ◽  
Radial Vibration ◽  
Positioning Systems

The paper presents a numerical and experimental investigation of a novel two degrees of freedom (2-DOF) piezoelectric actuator that can generate rotary motion of the sphere-shaped rotor as well as induce planar motion of the flat stage. The actuator has a small size and simple design and can be integrated into a printed circuit board (PCB). The application field of the actuator is small-dimensional and high-precision positioning systems. The piezoelectric actuator comprises three rectangular bimorph plates joined with arcs and arranged by an angle of 120 degrees. A high-stiffness rod is glued on the top surface of each bimorph plate and is used to rotate the rotor or move flat stage employing contact friction force. Three U-shaped structures are used for the actuator clamping. 2-DOF rotational or planar movement is obtained by applying a harmonic or asymmetric electrical signal. The operation principle of the actuator is based on the superposition of the B20 out-of-plane bending mode of the bimorph plates and the B03 radial vibration mode of the ring. Design optimization has been performed to maximize amplitudes of contact point vibration. A prototype of the actuator was made, and a maximum rotation speed of 795.15 RPM was achieved while preload of 546.03 mN was applied. The linear velocity of 36.45 mm/s was obtained at the same preload force. Resolution measurement showed that the actuator can achieve an angular resolution of 17.48 µrad and a linear resolution of 2.75 µm.

scholarly journals Improved Visible Light-Based Indoor Positioning System Using Machine Learning Classification and Regression

2019 ◽  
Vol 9 (6) ◽  
pp. 1048 ◽  
Author(s):  
Huy Tran ◽  
Cheolkeun Ha
Keyword(s):  
Machine Learning ◽  
Visible Light ◽  
Noise Reduction ◽  
Indoor Positioning ◽  
Computational Time ◽  
Dual Function ◽  
Positioning System ◽  
Positioning Accuracy ◽  
Positioning Systems ◽  
Machine Learning Classification

Recently, indoor positioning systems have attracted a great deal of research attention, as they have a variety of applications in the fields of science and industry. In this study, we propose an innovative and easily implemented solution for indoor positioning. The solution is based on an indoor visible light positioning system and dual-function machine learning (ML) algorithms. Our solution increases positioning accuracy under the negative effect of multipath reflections and decreases the computational time for ML algorithms. Initially, we perform a noise reduction process to eliminate low-intensity reflective signals and minimize noise. Then, we divide the floor of the room into two separate areas using the ML classification function. This significantly reduces the computational time and partially improves the positioning accuracy of our system. Finally, the regression function of those ML algorithms is applied to predict the location of the optical receiver. By using extensive computer simulations, we have demonstrated that the execution time required by certain dual-function algorithms to determine indoor positioning is decreased after area division and noise reduction have been applied. In the best case, the proposed solution took 78.26% less time and provided a 52.55% improvement in positioning accuracy.

Compact Drive Electronics for Solid-State Actuators

2000 ◽  
Author(s):  
Jeffrey S. N. Paine ◽  
David S. Bennett ◽  
Carlos E. Cuadros
Keyword(s):  
Solid State ◽  
Power Electronics ◽  
Piezoelectric Material ◽  
Piezoelectric Actuator ◽  
Power Dissipation ◽  
Piezoelectric Materials ◽  
Piezoelectric Actuators ◽  
Linear Amplifier ◽  
Overall Efficiency ◽  
Electronics Packages

Abstract As piezoelectric actuators are developed for high strokes and/or high force applications, the amount of piezoelectric material used in the actuator must also increase. Reducing the size of drive electronics becomes difficult using traditional linear power electronics packages when applications require as much as 40 μF of piezoelectric load. In order to efficiently drive piezoelectric actuator systems, bi-directional systems (drivers that recover the energy put into the piezoelectric capacitor) must be used. Since less than 10% of the power going into the piezoelectric actuator is real versus the large reactive load used to power the piezoelectric materials, bidirectional systems have a much higher efficiency. A comparison is made between traditional linear and PWM amplifier systems and tailored piezoelectric bi-directional driver systems. Bi-directional systems have power dissipation levels up to 1/8th those of traditional linear amplifier systems. In the course of the research both linear and PWM concepts were investigated. A rationale for comparing the overall efficiency of drive electronics systems is presented. Some innovative efficient concepts for piezoelectric system drivers are presented and discussed.

Synthesis of a basic satellite radio navigation system

2021 ◽  
pp. 3-16
Author(s):  
Т.С. Аббасова ◽  
В.И. Привалов ◽  
В.Г. Бондаренко
Keyword(s):  
Navigation System ◽  
Initial Step ◽  
Positioning Accuracy ◽  
Phase Measurements ◽  
Positioning Systems ◽  
Radio Navigation ◽  
Satellite Radio Navigation System ◽  
Radio Navigation System ◽  
Effective Procedures ◽  
Basic Version

На основе анализа особенностей навигационно-временных определений и методологических основ проектирования в системах высокоточного позиционирования проведена генерация вариантов спутниковой радионавигационной системы, исходным шагом в которой является синтез её базового варианта. Рассмотрены наиболее эффективные процедуры разрешения неоднозначности фазовых измерений, основанных на избыточности фазовых измерений, а также процедуры, заключающиеся в целочисленной максимизации функции неоднозначности, выбранной из характера периодичности сигналов навигационного космического аппарата. Сформулирован критерий точности позиционирования. Based on the analysis of the features of navigation-time definitions and methodological foundations of design in high-precision positioning systems, the generation of options for a satellite radio navigation system was carried out, the initial step in which is the synthesis of its basic version. The most effective procedures for resolving the ambiguity of phase measurements based on the redundancy of phase measurements, as well as procedures involving the integer maximization of the ambiguity function, selected from the nature of the periodicity of the signals of the navigation spacecraft, are considered. A criterion for positioning accuracy is formulated.

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