Course Module on Precision Control of Piezoelectric Actuators

2012 ◽  
Author(s):  
Hui-Ru Shih ◽  
Wilbur L. Walters
Keyword(s):  
Undergraduate Students ◽  
Piezoelectric Materials ◽  
Piezoelectric Actuators ◽  
Pedagogical Tools ◽  
Precision Control ◽  
Engineering And Technology ◽  
Hands On ◽  
Piezoelectric Devices ◽  
Mechanical Actuation ◽  
Lecture Experiment

Conventional mechanical actuation mechanisms, which have been used to drive nanoscale devices, have the drawback of requiring high power for operation. However, the piezoelectric actuation mechanism offers the advantages of extremely low power consumption. As piezoelectric materials change the practice of engineering and technology, providing undergraduate students with experiences with these materials has become necessary. This paper presents the design of a course module on precision control of piezoelectric actuators for undergraduate students. The course module incorporates lecture, experiment, and problem-based learning as pedagogical tools. Students are given opportunities to work directly with piezoelectric actuators to gain hands-on experience. Students can learn about actuation advantages of the piezoelectric materials along with their control problems. This course module can improve the knowledge of the students on how to design and analyze piezoelectric devices.

An Introduction to Smart Structure and Its Application in Nanotechnology

2008 ◽  
Author(s):  
Hui-Ru Shih ◽  
Wilbur L. Walters ◽  
Wei Zheng
Keyword(s):  
Undergraduate Students ◽  
Smart Materials ◽  
Smart Structure ◽  
State University ◽  
Jackson State University ◽  
Laboratory Activities ◽  
Engineering And Technology ◽  
Hands On ◽  
Core Concepts ◽  
Technology Educators

The use of smart materials for the control of shape, vibration, and stability of structural systems has become more prevalent in recent years. Nanotechnology is regarded worldwide as the technology of the 21st century. As nanotechnology begins to unfold, smart materials will also play a key role in revolutionizing the productivity of emerging nano applications. To ensure the progress and success of smart-structure technology, engineering and technology educators need to make strong efforts to educate the students. At Jackson State University (JSU), two course modules have been developed and added to existing technology course that have helped undergraduate students develop hands-on experience as well as strengthen students’ foundation in smart materials and structures. The modules consist of lectures and laboratory activities. The lecture materials cover core concepts. The laboratory activities give students hands-on skills with observing, measuring and controlling the behavior of smart structures. The effectiveness of these modules has been assessed. Responses and feedback from students who have taken these modules are very positive.

Modeling, Control and Application of Piezoelectric Actuators

2010 ◽  
Author(s):  
Hui-Ru Shih ◽  
Wilbur L. Walters
Keyword(s):  
Undergraduate Students ◽  
Smart Materials ◽  
Piezoelectric Actuators ◽  
Student Feedback ◽  
State University ◽  
Force Microscopy ◽  
Technology Students ◽  
Atomic Force ◽  
Jackson State University ◽  
Engineering And Technology

Nanotechnology is a growing area that educators are interested in attracting students to. Smart materials have become the workhorse in a multitude of nanotechnology. One example is the piezoelectric actuators which are used for nano-positioning in Atomic Force Microscopy (AFM). The majority of today’s engineering and technology students are unaware of the remarkable properties of smart materials as well as their applications in nanotechnology. Therefore, providing students with the knowledge and experience of piezoelectric actuators is the crucial step in integrating nanotechnology into engineering and technology education. One course module has been developed for introducing modeling, control, and application of piezoelectric actuators to undergraduate students at Jackson State University. This module includes classroom lectures, demonstrations, and actual exercises. This paper discusses the development and implementation of the teaching module and provides some initial student feedback. The course module description and covered topics are presented in detailed. The course module presented in this paper can easily and seamlessly be integrated to the existing engineering and technology courses.

Integrating Disciplines in a Plant Chemistry Laboratory Module to Enhance Interdisciplinary and Scientific Thinking in Undergraduate Students

2019 ◽  
Author(s):  
Lucas Busta ◽  
Sabrina E. Russo
Keyword(s):  
Critical Thinking ◽  
Medicinal Plant ◽  
Systems Thinking ◽  
Undergraduate Students ◽  
Core Competencies ◽  
Chemistry Laboratory ◽  
Scientific Thinking ◽  
Written Communication ◽  
Plant Chemistry ◽  
Hands On

Here, we describe a hands-on medicinal plant chemistry laboratory module (Phytochemical Laboratory Activities for iNtegrative Thinking and Enhanced Competencies; PLANTEC) for undergraduates that targets the development of core competencies in (i) critical thinking and analysis of text and data, (ii) interdisciplinary and systems thinking, (iii) oral and written communication of science, and (iv) teamwork and collaboration.<br>

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.

scholarly journals A Method for Quantitatively Separating the Piezoelectric Component from the as-received "Piezoelectric" Signal

2021 ◽  
Author(s):  
Chaojie Chen ◽  
Shilong Zhao ◽  
Caofeng Pan ◽  
Yunlong Zi ◽  
Fangcheng Wang ◽  
...  
Keyword(s):  
Vinylidene Fluoride ◽  
Piezoelectric Effect ◽  
Piezoelectric Materials ◽  
Contact Electrification ◽  
Poly Vinylidene Fluoride ◽  
Implantable Electronics ◽  
The Time Domain ◽  
Electric Signals ◽  
Piezoelectric Devices ◽  
Piezoelectric Performance

Abstract Polymer-based piezoelectric devices are promising for developing future wearable force sensors, nanogenerators, and implantable electronics etc. The electric signals generated by them are often assumed as solely coming from piezoelectric effect. However, triboelectric signals originated from contact electrification between the piezoelectric devices and the contacted objects can produce non-negligible interfacial electron transfer, which is often combined with the piezoelectric signal to give a triboelectric-piezoelectric hybrid output, leading to an exaggerated measured “piezoelectric” signal. Herein, a simple and effective method is proposed for quantitatively identifying and extracting the piezoelectric charge from the hybrid signal. The triboelectric and piezoelectric parts in the hybrid signal generated by a poly(vinylidene fluoride)-based device are clearly differentiated, and their force and charge characteristics in the time domain are identified. This work presents an effective method to elucidate the true piezoelectric performance in practical measurement, which is crucial for evaluating piezoelectric materials fairly and correctly.

Application of Piezoelectric Materials for Monitoring the Growth of Defects in Structures

2010 ◽  
Vol 643 ◽  
pp. 113-118 ◽  
Author(s):  
Sergio Ricardo Kokay Morikawa ◽  
Daniel Pontes Lannes ◽  
Antonio Lopes Gama
Keyword(s):  
Strain Field ◽  
Piezoelectric Materials ◽  
Piezoelectric Actuators ◽  
Frame Structure ◽  
Piezoelectric Sensors ◽  
Dynamic Strain ◽  
Damage Growth ◽  
Defect Depth ◽  
Active Method ◽  
Electromechanical Responses

This paper presents the results of an experimental investigation on the use of piezoelectric materials as a technique for monitoring the growth of defects in structures. The method consists of exciting the structure with piezoelectric actuators while recording the electromechanical responses from sensors placed close to the defect. The piezoelectric sensors detect the damage growth or an incipient defect by monitoring changes in the dynamic strain field, induced by the piezoelectric actuator, near the defect. This technique was evaluated through experiments using an aluminum frame structure. Results show that the piezoelectric active method is capable of detecting small changes in defect depth.

Damage Modeling and Detection in Smart Composites

2000 ◽  
Author(s):  
Aditi Chattopadhyay ◽  
Dan Dragomir-Daescu
Keyword(s):  
Composite Laminates ◽  
Composite Structures ◽  
Piezoelectric Materials ◽  
Piezoelectric Actuators ◽  
Order Theory ◽  
Higher Order ◽  
Damage Indices ◽  
Higher Order Theory ◽  
Extent Of Damage ◽  
Reliability And Robustness

Abstract The presence of damage in structures made out of composite and/or piezoelectric materials can cause significant degradation in structural performance. In the present paper, damage indices based on two-dimensional gapped smoothing technique and model strains are developed in order to enhance the accuracy in predicting the location and extent of damage in composite structures. Structural analysis is performed based on a refined higher order theory, which can capture the transverse shear effects in anisotropic laminates. An approach using the developed damage indices and the laminate model of the higher order theory is employed to model and identify delaminations in composite laminates. It is also used in the delamination analysis of composite laminates with piezoelectric actuators. The proposed modal strain based damage indexes are used to perform delamination analysis. Comparison study is performed to illustrate that the reliability and robustness of the new proposed damage indices in locating delaminations in composite and smart composite structures. The effects on modal strain and damage indices due to the presence of surface bounded piezoelectric actuators are also presented and discussed.

Energy Harvesting Aspects of Irregular Vibrating Forces Acting on Piezoelectric Devices

2015 ◽  
pp. 143-158
Author(s):  
Alessandro Massaro
Keyword(s):  
Energy Harvesting ◽  
Piezoelectric Materials ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Output Current ◽  
Vibrating System ◽  
External Forces ◽  
Piezoelectric Devices ◽  
Three Dimensional Space

After a brief introduction of piezoelectric materials, this chapter focuses on the characterization of vibrating freestanding piezoelectric AlN devices forced by different external forces acting simultaneously. The analyzed vibrating forces are applied mainly to piezoelectric freestanding structures stimulated by irregular vibration phenomena. Particular kinds of theoretical noise signals are commented. The goal of the chapter is to analyze the effect of the noise in order to model the chaotic vibrating system and to predict the output current signals. Moreover, the author also shows a possible alternative way to detect different vibrating force directions in the three dimensional space by means of curved piezoelectric layouts.

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