scholarly journals Investigation on a Linear Piezoelectric Actuator Based on Stick-Slip/Scan Excitation

Actuators ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 39
Author(s):  
Yunlai Shi ◽  
Chengshu Lou ◽  
Jun Zhang
Keyword(s):  
High Resolution ◽  
Piezoelectric Actuator ◽  
Composite Structure ◽  
Piezoelectric Composite ◽  
Linear Motion ◽  
Slip Mode ◽  
Stick Slip ◽  
Flexible Hinge ◽  
Long Stroke ◽  
Scan Modes

To perform a high resolution and long stroke application in optical precision instruments, a linear piezoelectric actuator operated in stick-slip/scan modes for driving a linear motion table is presented. The proposed piezoelectric actuator is a piezoelectric composite structure, which includes a metal elastomer, a piezoelectric stack, and a frictional ball. The purpose of this paper is to describe the operation principle, design, and the running test and resolution test of the linear motion table driven by the proposed piezoelectric actuator. The notable feature is the flexible hinges of the actuator, including composite hinge, pre-pressure adjustment flexible hinge, and transmission flexible hinge, which are designed for decoupling the motion in the action direction of the piezoelectric stack and the direction in which the pre-pressure is applied. A prototype has been fabricated and two operation modes of the piezoelectric actuator, stick-slip and scan mode, were utilized to test the driving characteristics of the linear motion table. Experimental results show that the finest step resolutions in stick-slip mode and scan mode achieved 12 nm and 4 nm, respectively.

scholarly journals A Novel Stick-Slip Type Rotary Piezoelectric Actuator

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Yuan Wang ◽  
Minglong Xu ◽  
Shubao Shao ◽  
Siyang Song ◽  
Yan Shao
Keyword(s):  
Piezoelectric Actuator ◽  
Experimental System ◽  
Driving Voltage ◽  
Stick Slip ◽  
Piezoelectric Stacks ◽  
Long Stroke ◽  
Fine Resolution ◽  
Stick Slip Motion ◽  
Slip Motion ◽  
Sawtooth Waveform

A novel stick-slip rotary piezoelectric actuator is designed for optical use. The actuator is proposed, fabricated, and tested with the aim of realizing both fine resolution and a long stroke. The dynamic model of the actuator is established, and simulations are performed to discover how the input driving voltage affects the stick-slip motion of the actuator. An experimental system is built to evaluate the performance of the actuator at different frequencies, voltages, and numbers of driving piezoelectric stacks. Experimental results show that the minimal output stepping angle is 3.5 μrad (0.2 millidegrees) under a sawtooth waveform having a voltage of 13 V and frequency of 3000 Hz and that the velocity reaches 0.44 rad/s (25°/s) under a sawtooth waveform having a voltage of 93 V and frequency of 3000 Hz, while the stroke is infinite. The proposed actuator provides stable and accurate rotary motion and realizes a high velocity.

A stick-slip linear piezoelectric actuator with mode conversion flexible hinge driven by symmetrical waveform

2020 ◽  
Vol 29 (5) ◽  
pp. 055035
Author(s):  
Xiaosong Zhang ◽  
Yang Yu ◽  
Qiang Gao ◽  
Guangda Qiao ◽  
Zelin Li ◽  
...  
Keyword(s):  
Piezoelectric Actuator ◽  
Mode Conversion ◽  
Stick Slip ◽  
Flexible Hinge

Note: Lever-type bidirectional stick-slip piezoelectric actuator with flexible hinge

2018 ◽  
Vol 89 (8) ◽  
pp. 086101 ◽  
Author(s):  
Yikang Li ◽  
Hengyu Li ◽  
Tinghai Cheng ◽  
Xiaohui Lu ◽  
Hongwei Zhao ◽  
...  
Keyword(s):  
Piezoelectric Actuator ◽  
Stick Slip ◽  
Flexible Hinge

scholarly journals Design, Analysis, and Experiment on a Novel Stick-Slip Piezoelectric Actuator with a Lever Mechanism

Micromachines ◽  
2019 ◽  
Vol 10 (12) ◽  
pp. 863 ◽  
Author(s):  
Weiqing Huang ◽  
Mengxin Sun
Keyword(s):  
Piezoelectric Actuator ◽  
Simple Structure ◽  
Fast Response ◽  
Displacement Sensor ◽  
Design Parameters ◽  
The Finite Element Method ◽  
Stick Slip ◽  
Lever Mechanism ◽  
Series Of Experiments ◽  
Stator Design

A piezoelectric actuator using a lever mechanism is designed, fabricated, and tested with the aim of accomplishing long-travel precision linear driving based on the stick-slip principle. The proposed actuator mainly consists of a stator, an adjustment mechanism, a preload mechanism, a base, and a linear guide. The stator design, comprising a piezoelectric stack and a lever mechanism with a long hinge used to increase the displacement of the driving foot, is described. A simplified model of the stator is created. Its design parameters are determined by an analytical model and confirmed using the finite element method. In a series of experiments, a laser displacement sensor is employed to measure the displacement responses of the actuator under the application of different driving signals. The experiment results demonstrate that the velocity of the actuator rises from 0.05 mm/s to 1.8 mm/s with the frequency increasing from 30 Hz to 150 Hz and the voltage increasing from 30 V to 150 V. It is shown that the minimum step distance of the actuator is 0.875 μm. The proposed actuator features large stroke, a simple structure, fast response, and high resolution.

New LWD Image Improvement Method to Mitigate Interpretation Risks

2021 ◽  
Author(s):  
Tianhua Zhang ◽  
Shiduo Yang ◽  
Chandramani Shrivastava ◽  
Adrian A ◽  
Nadege Bize-Forest
Keyword(s):  
High Resolution ◽  
Real Time ◽  
Best Practice ◽  
Synthetic Data ◽  
Image Resolution ◽  
Drilling Process ◽  
Drilling Tool ◽  
Stick Slip ◽  
Geological Interpretation ◽  
Wellbore Temperature

Abstract With the advancement of LWD (Logging While Drilling) hardware and acquisition, the imaging technology becomes not only an indispensable part of the drilling tool string, but also the image resolution increases to map layers and heterogeneity features down to less than 5mm scale. This shortens the geological interpretation turn-around time from wireline logging time (hours to days after drilling) to semi-real time (drilling time or hours after drilling). At the same time, drilling motion is complex. The depth tracking is on the surface referenced to the surface block movement. The imaging sensor located downhole can be thousands of feet away from the surface. Mechanical torque and drag, wellbore friction, wellbore temperature and weight on bit can make the downhole sensor movement motion not synchronized with surface pipe depth. This will cause time- depth conversion step generate image artifacts that either stop real-time interpretation of geological features or mis-interpret features on high resolution images. In this paper, we present several LWD images featuring distortion mechanism during the drilling process using synthetic data. We investigated how heave, depth reset and downhole sensor stick/slip caused image distortions. We provide solutions based on downhole sensor pseudo velocity computation to minimize the image distortion. The best practice in using Savitsky-Golay filter are presented in the discussion sections. Finally, some high-resolution LWD images distorted with drilling-related artifacts and processed ones are shown to demonstrate the importance of image post-processing. With the proper processed images, we can minimize interpretation risks and make drilling decisions with more confidence.

A stick–slip piezoelectric actuator with high consistency in forward and reverse motions

2020 ◽  
Vol 91 (10) ◽  
pp. 105005
Author(s):  
Zhi Xu ◽  
Xuan Li ◽  
Kuifeng Wang ◽  
Tianwei Liang ◽  
Jingshi Dong ◽  
...  
Keyword(s):  
Piezoelectric Actuator ◽  
Stick Slip ◽  
High Consistency
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