IWPMA (International Workshop on Piezoelectric Materials and Applications in Actuators) 2020

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Mechanical Engineering".

Deadline for manuscript submissions: closed (10 January 2022) | Viewed by 6581

Special Issue Editors


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Guest Editor
Institute of Dynamics and Vibration Research, Leibniz Universität Hannover, 30823 Garbsen, Germany
Interests: piezoelectric systems and ultrasonic technologies; automotive engineering (in particular NVH and acoustics); contact mechanics and friction; nonlinear oscillations; rotor dynamics
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Guest Editor
Institute of Dynamics and Vibration Research, Leibniz Universität Hannover, 30823 Garbsen, Germany
Interests: piezoelectric and ultrasonic technology; piezoelectric actuators; ultrasonics; nonlinear vibration; energy harvesting

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Guest Editor
Department of Materials Science and Engineering, Penn State College of Earth and Mineral Sciences, 230 Innovation Blvd, Room 108 The 230 Bldg, State College, PA 16803, USA

Special Issue Information

Dear Colleagues,

Since their discovery, piezoelectric materials have found numerous applications over the years, ranging from sonar to, at present, integrated devices. Thanks to their unique bidirectional energy conversion potentials, such materials have been the subject of many scientific and industrial studies, and many material devices have emerged through research progress.

Hence, the objective of IWPMA 2020 (the 17th edition of IWPMA after the last editions in Lyon, France in 2019 and Kobe, Japan in 2018) is to gather researchers in a unique and successful international workshop to share their latest discoveries in terms of piezoelectric materials and their application in actuators, and more generally, energy conversion devices, thus pioneering and shaping the future of piezoelectric materials and devices.

The conference scope therefore focuses on piezoelectric materials (ceramics, single crystals, polymers, lead-free materials, elaboration, characterization, etc.), as well as their application in actuators (ultrasonic tools, acoustic devices, motors, transformers, etc.) and in sensing and energy harvesting systems (imaging, MEMS, etc.). In this framework, this Special Issue aims at gathering selected papers from presentations performed during the conference. The conference topics cover but are not limited to the following items:

Piezoelectric material and structures

  • Synthesis and elaboration: ceramics; 
  • Polymers, single crystals, lead-free materials;
  • Multiferroic materials and systems;
  • Piezoelectric metamaterials and metastructures;
  • Manufacturing processes;

Modeling and Characterization

  • Multiphysics modeling involving piezoelectric/flexoelectric effects;
  • Piezoelectric material and device modeling;
  • Numerical methods;
  • Experimental methods.

Devices and Systems

  • MEMS devices (actuators and sensors);
  • Solid state actuators;
  • Composite sensors/actuators;
  • Ultrasonic and acoustic devices; 
  • Piezoelectric transformers;
  • Piezo-based structural health monitoring;
  • Energy harvesting structures;
  • Drive circuits for piezoelectric devices;
  • Electrical interfaces for energy harvesting.

Prof. Dr. Jörg Wallaschek
Dr. Jens Twiefel
Dr. Yongke Yan
Guest Editors

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Keywords

  • Piezoelectric Materials
  • Synthesis and Elaboration
  • Manufacturing
  • Characterization and Modeling
  • Transducers
  • Ultrasonic Tool
  • Ultrasonic Motor
  • Sensor
  • Energy Harvesting
  • MEMS

Published Papers (3 papers)

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Research

12 pages, 16500 KiB  
Article
Identification of the Effect of Ultrasonic Friction Reduction in Metal-Elastomer Contacts Using a Two-Control-Loop Tribometer
by Michael Weinstein, Christian Nowroth, Jens Twiefel and Jörg Wallaschek
Appl. Sci. 2021, 11(14), 6289; https://doi.org/10.3390/app11146289 - 07 Jul 2021
Viewed by 1748
Abstract
Pneumatic cylinders are widely used in highly dynamic processes, such as handling and conveying tasks. They must work both reliably and accurately. The positioning accuracy suffers from the stick-slip effect due to strong adhesive forces during the seal contact and the associated high [...] Read more.
Pneumatic cylinders are widely used in highly dynamic processes, such as handling and conveying tasks. They must work both reliably and accurately. The positioning accuracy suffers from the stick-slip effect due to strong adhesive forces during the seal contact and the associated high breakaway forces. To achieve smooth motion of the piston rod and increased position accuracy despite highly variable position dynamics, sliding friction and breakaway force must be reduced. This contribution presents a specially designed linear tribometer that has two types of control. Velocity control allows the investigation of sliding friction mechanisms. Friction force control allows investigation of the breakaway force. Due to its bearing type, the nearly disturbance-free detection of stick-slip transients and the dynamic contact behavior of the sliding friction force was possible. The reduction of the friction force was achieved by a superposition of the piston rod’s movement by longitudinal ultrasonic vibrations. This led to significant reductions in friction forces at the rubber/metal interface. In addition, the effects of ultrasonic frequency and vibration amplitude on the friction reduction were investigated. With regard to the breakaway force, significant success was achieved by the excitation. The force control made it possible to identify the characteristic movement of the sealing ring during a breakaway process. Full article
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15 pages, 3734 KiB  
Article
Research on a Piezoelectric Pump with Flexible Valves
by Weiqing Huang, Liyi Lai, Zhenlin Chen, Xiaosheng Chen, Zhi Huang, Jietao Dai, Fan Zhang and Jianhui Zhang
Appl. Sci. 2021, 11(7), 2909; https://doi.org/10.3390/app11072909 - 24 Mar 2021
Cited by 6 | Viewed by 1614
Abstract
Imitating the structure of the venous valve and its characteristics of passive opening and closing with changes in heart pressure, a piezoelectric pump with flexible valves (PPFV) was designed. Firstly, the structure and the working principle of the PPFV were introduced. Then, the [...] Read more.
Imitating the structure of the venous valve and its characteristics of passive opening and closing with changes in heart pressure, a piezoelectric pump with flexible valves (PPFV) was designed. Firstly, the structure and the working principle of the PPFV were introduced. Then, the flexible valve, the main functional component of the pump, was analyzed theoretically. Finally, an experimental prototype was manufactured and its performance was tested. The research proves that the PPFV can achieve a smooth transition between valved and valveless by only changing the driving signal of the piezoelectric (PZT) vibrator. The results demonstrate that when the driving voltage is 100 V and the frequency is 25 Hz, the experimental flow rate of the PPFV is about 119.61 mL/min, and the output pressure is about 6.16 kPa. This kind of pump can realize the reciprocal conversion of a large flow rate, high output pressure, and a small flow rate, low output pressure under the electronic control signal. Therefore, it can be utilized for fluid transport and pressure transmission at both the macro-level and the micro-level, which belongs to the macro–micro combined component. Full article
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13 pages, 8862 KiB  
Article
A Disc-Type High Speed Rotary Ultrasonic Motor with Internal Contact Teeth
by Jianmin Qiu, Ying Yang, Xin Hong, Piotr Vasiljev, Dalius Mazeika and Sergejus Borodinas
Appl. Sci. 2021, 11(5), 2386; https://doi.org/10.3390/app11052386 - 08 Mar 2021
Cited by 4 | Viewed by 1954
Abstract
This paper presents a disc-type ultrasonic piezoelectric motor, which is designed for micro flying vehicles. It provides a high output rotation speed under low operating voltage, compared with common piezoelectric devices, by employing a “contact teeth” wave transmission structure. The ultrasonic motor (USM) [...] Read more.
This paper presents a disc-type ultrasonic piezoelectric motor, which is designed for micro flying vehicles. It provides a high output rotation speed under low operating voltage, compared with common piezoelectric devices, by employing a “contact teeth” wave transmission structure. The ultrasonic motor (USM) consists of a trimorph disc stator, with triple internal contact teeth, a shaft and two hemispheric hard-wearing rotors. The operating principle of the USM is based on the superposition of the in-plane B03 vibration mode of the trimorph disc, and the first longitudinal vibration of the contact teeth. An optimization method of the stator structure parameters was proposed and validated by numerical modeling. The diameter and thickness of the stator are 20 mm and 1 mm, respectively. A prototype with the weight of 2 g was made for this experimental test. The optimal frequency of the excitation signal and the preload force are 98.5 kHz and 0.5 N, respectively. The minimum operating voltage was tested under 7.5 V and reached the speed of 225 rpm, and the maximum unloaded rotational speed of the USM reached 5172 rpm when 30 V driving voltage was applied. The maximum lifting force generated by this USM was measured as 46.1 mN, which is 2.35 times bigger than its weight. Full article
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