scholarly journals Single Vibration Mode Standing Wave Tubular Piezoelectric Ultrasonic Motor

2021 ◽  
Author(s):  
Soonho Park
Keyword(s):  
Standing Wave ◽  
Vibration Mode ◽  
Cylindrical Tube ◽  
Electrical Energy ◽  
High Energy ◽  
High Energy Density ◽  
Ultrasonic Frequency ◽  
Ultrasonic Motors ◽  
Piezoelectric Motors ◽  
Piezoelectric Effects

The objective of this thesis is to report the single vibration mode standing wave tubular piezoelectric ultrasonic motors developed. Piezoelectric motors are driven by reverse piezoelectric effects which converts an input of ultrasonic frequency of electrical energy into an output of mechanical movement. There are many advantages of piezoelectric ultrasonic motors compared to electromagnetic motors such as simple structure, high energy density, and high torque at low speed. Three prototypes are designed and fabricated. Two motors are fabricated using PZT cylindrical tube; one with PZT teeth and the other with metal teeth. A third motor using brass tube with PZT plates attached is fabricated. After design and fabrication of three prototypes, the performances of the motors are tested using a test apparatus for speed and torque.

scholarly journals Single Vibration Mode Standing Wave Tubular Piezoelectric Ultrasonic Motor

2021 ◽  
Author(s):  
Soonho Park
Keyword(s):  
Standing Wave ◽  
Vibration Mode ◽  
Cylindrical Tube ◽  
Electrical Energy ◽  
High Energy ◽  
High Energy Density ◽  
Ultrasonic Frequency ◽  
Ultrasonic Motors ◽  
Piezoelectric Motors ◽  
Piezoelectric Effects

The objective of this thesis is to report the single vibration mode standing wave tubular piezoelectric ultrasonic motors developed. Piezoelectric motors are driven by reverse piezoelectric effects which converts an input of ultrasonic frequency of electrical energy into an output of mechanical movement. There are many advantages of piezoelectric ultrasonic motors compared to electromagnetic motors such as simple structure, high energy density, and high torque at low speed. Three prototypes are designed and fabricated. Two motors are fabricated using PZT cylindrical tube; one with PZT teeth and the other with metal teeth. A third motor using brass tube with PZT plates attached is fabricated. After design and fabrication of three prototypes, the performances of the motors are tested using a test apparatus for speed and torque.

scholarly journals Strategies to Improve the Energy Storage Properties of Perovskite Lead-Free Relaxor Ferroelectrics: A Review

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5742
Author(s):  
Vignaswaran Veerapandiyan ◽  
Federica Benes ◽  
Theresa Gindel ◽  
Marco Deluca
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
Electrical Energy ◽  
High Energy ◽  
Relaxor Ferroelectrics ◽  
High Energy Density ◽  
Lead Free ◽  
Chemical Additives ◽  
Energy Storage Properties ◽  
Novel Processing

Electrical energy storage systems (EESSs) with high energy density and power density are essential for the effective miniaturization of future electronic devices. Among different EESSs available in the market, dielectric capacitors relying on swift electronic and ionic polarization-based mechanisms to store and deliver energy already demonstrate high power densities. However, different intrinsic and extrinsic contributions to energy dissipations prevent ceramic-based dielectric capacitors from reaching high recoverable energy density levels. Interestingly, relaxor ferroelectric-based dielectric capacitors, because of their low remnant polarization, show relatively high energy density and thus display great potential for applications requiring high energy density properties. In this study, some of the main strategies to improve the energy density properties of perovskite lead-free relaxor systems are reviewed, including (i) chemical modification at different crystallographic sites, (ii) chemical additives that do not target lattice sites, and (iii) novel processing approaches dedicated to bulk ceramics, thick and thin films, respectively. Recent advancements are summarized concerning the search for relaxor materials with superior energy density properties and the appropriate choice of both composition and processing routes to match various applications’ needs. Finally, future trends in computationally-aided materials design are presented.

Dielectric Elastomer Energy Harvesting and its Application to Human Walking

2011 ◽  
Author(s):  
Heather Lai ◽  
Chin An Tan ◽  
Yong Xu
Keyword(s):  
Energy Harvesting ◽  
Knee Joint ◽  
Mechanical Energy ◽  
Electrical Energy ◽  
High Energy ◽  
Dielectric Elastomer ◽  
Metabolic Energy ◽  
High Energy Density ◽  
Human Walking ◽  
Wide Range

Human walking requires sophisticated coordination of muscles, tendons, and ligaments working together to provide a constantly changing combination of force, stiffness and damping. In particular, the human knee joint acts as a variable damper, dissipating greater amounts of energy when the knee undergoes large rotational displacements during walking, running or hopping. Typically, this damping results from the dissipation, or loss, of metabolic energy. It has been proven to be possible however; to collect this otherwise wasted energy through the use of electromechanical transducers of several different types which convert mechanical energy to electrical energy. When properly controlled, this type of device not only provides desirable structural damping effects, but the energy generated can be stored for use in a wide range of applications. A novel approach to an energy harvesting knee joint damper is presented using a dielectric elastomer (DE) smart material based electromechanical transducer. Dielectric elastomers are extremely elastic materials with high electrical permittivity which operate based on electrostatic effects. By placing compliant electrodes on either side of a dielectric elastomer film, a specialized capacitor is created, which couples mechanical and electrical energy using induced electrostatic stresses. Dielectric elastomer energy harvesting devices not only have a high energy density, but the material properties are similar to that of human tissue, making it highly suitable for wearable applications. A theoretical framework for dielectric elastomer energy harvesting is presented along with a mapping of the active phases of the energy harvesting to the appropriate phases of the walking stride. Experimental results demonstrating the energy harvesting capability of a DE generator undergoing strains similar to those experienced during walking are provided for the purpose of verifying the theoretical results. The work presented here can be applied to devices for use in rehabilitation of patients with muscular dysfunction and transfemoral prosthesis as well as energy generation for able-bodied wearers.

Research for Combustor Based on Micro-Thermoelectric Generator Device

2010 ◽  
Vol 97-101 ◽  
pp. 2509-2513 ◽  
Author(s):  
Rui Yin Song ◽  
Xian Cheng Wang ◽  
Mei Qin Zhang
Keyword(s):  
Thermoelectric Generator ◽  
Simulation Models ◽  
Electrical Energy ◽  
High Energy ◽  
High Energy Density ◽  
Micro Electro Mechanical Systems ◽  
Thermal Exchange ◽  
Thermal Transfer ◽  
Micro Thermoelectric Generator ◽  
Micro Combustor

Micro-thermoelectric generator device (MTGD) is used to supply lasting electrical energy for Micro-electro-mechanical systems (MEMS). As an important part of MTGD, micro-combustor with high energy density has direct influence on the total electrical generating efficiency for MTG. D In this paper, Considering some parameters such as material, dimension, flux of fuel and shape of thermal conductive tunnel for micro-combustor, some simulation models such as thermal transfer, combustion for micro-combustor were built up, and some simulation results were got. Based upon, optimized micro flat combustors were designed and tested. The experiment results illustrated that the conduct efficiency of micro-combustor was well controlled by adjusting heat flux, and the combustor with shape of zigzag combustion tunnel has high thermal exchange efficiency in experiment models. By adjusting flux of fuel and the structure of micro premixed combustor, the heat loss of MTGD was reduced and output power was improved in a degree.

Electro-active phase formation in PVDF–BiVO4 flexible nanocomposite films for high energy density storage application

RSC Advances ◽  
2014 ◽  
Vol 4 (89) ◽  
pp. 48220-48227 ◽  
Author(s):  
Subrata Sarkar ◽  
Samiran Garain ◽  
Dipankar Mandal ◽  
K. K. Chattopadhyay
Keyword(s):  
Dielectric Properties ◽  
Energy Density ◽  
Phase Formation ◽  
Nanocomposite Film ◽  
Active Phase ◽  
Electrical Energy ◽  
High Energy ◽  
High Energy Density ◽  
Nanocomposite Films ◽  
Energy Harvesters

A significant improvement of dielectric properties and toughness with electrical energy density up to 11 J cm−3 is observed in flexible PVDF–BiVO4 nanocomposite film. It underlines to use as flexible high energy density capacitors and piezoelectric based energy harvesters.

Toward dendrite-free alkaline zinc-based rechargeable batteries: A minireview

2019 ◽  
Vol 12 (05) ◽  
pp. 1930004 ◽  
Author(s):  
Xin Cao ◽  
Huan Xia ◽  
Xiangyu Zhao
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
Dendritic Growth ◽  
Low Cost ◽  
Electrical Energy ◽  
High Energy ◽  
Rechargeable Batteries ◽  
High Energy Density ◽  
Electrode Design ◽  
Electrical Energy Storage

Alkaline zinc-based rechargeable batteries (AZRBs) are competitive candidates for future electrical energy storage because of their low-cost, eco-friendliness and high energy density. However, plagued by dendrites, the AZRBs suffer from drastic decay in electrochemical properties and safety. This review elucidates fundamentals of zinc dendritic formation and summarizes the strategies, including electrode design and modification, electrolyte optimization and separator improvement, for suppressing zinc dendritic growth.

Fabrication of necklace-like fibers separator by electrospinning technique for high electrochemical performance and safe lithium metal batteries

2021 ◽  
Author(s):  
Can Liao ◽  
Longfei Han ◽  
Na Wu ◽  
Xiaowei Mu ◽  
Yuan Hu ◽  
...  
Keyword(s):  
Electrical Energy ◽  
High Energy ◽  
High Energy Density ◽  
Lithium Metal ◽  
Electrospinning Technique ◽  
Suitable Candidate ◽  
Electrical Energy Storage ◽  
Storage Devices ◽  
Lithium Metal Batteries ◽  
Lithium Dendrites

Lithium (Li) metal batteries, as the ultimate goal of high energy density storage devices, have been regarded as a suitable candidate for next-generation electrical energy storage. Nevertheless, uncontrolled lithium dendrites...

scholarly journals Dielectric Elastomer Generator for Electromechanical Energy Conversion: A Mini Review

2021 ◽  
Vol 13 (17) ◽  
pp. 9881
Author(s):  
Kui Di ◽  
Kunwei Bao ◽  
Haojie Chen ◽  
Xinjun Xie ◽  
Jianbo Tan ◽  
...  
Keyword(s):  
Large Scale ◽  
Mechanical Energy ◽  
Electrical Energy ◽  
Fast Response ◽  
High Energy ◽  
Dielectric Elastomer ◽  
Human Motion ◽  
High Energy Density ◽  
Small Scale ◽  
Electromechanical Energy Conversion

The dielectric elastomer generator (DEG) has attracted attention in converting mechanical energy into electrical energy, due to its high energy density, fast response, and light weight, which together make DEG a promising technology for electromechanical conversion. In this article, recent research papers on DEG are reviewed. First, we present the working principles, parameters, materials, and deformation modes of DEG. Then, we introduce DEG prototypes in the field of collecting mechanical energy, including small-scale applications for wind energy and human motion energy, and large-scale applications for wave energy. At the end of the review, we discuss the challenges and perspectives of DEG. We believe that DEG will play an important role in mechanical energy harvesting in the future.

scholarly journals Design and Performance Analysis of Hybrid Battery and Ultracapacitor Energy Storage System for Electrical Vehicle Active Power Management

2022 ◽  
Vol 14 (2) ◽  
pp. 776
Author(s):  
Aditya Kachhwaha ◽  
Ghamgeen Izat Rashed ◽  
Akhil Ranjan Garg ◽  
Om Prakash Mahela ◽  
Baseem Khan ◽  
...  
Keyword(s):  
Energy Storage ◽  
Electric Vehicles ◽  
Storage System ◽  
Electrical Energy ◽  
Energy Storage System ◽  
High Energy ◽  
Green Energy ◽  
Active Power ◽  
High Energy Density ◽  
Electrical Energy Storage

The electrical energy storage system faces numerous obstacles as green energy usage rises. The demand for electric vehicles (EVs) is growing in tandem with the technological advance of EV range on a single charge. To tackle the low-range EV problem, an effective electrical energy storage device is necessary. Traditionally, electric vehicles have been powered by a single source of power, which is insufficient to handle the EV’s dynamic demand. As a result, a unique storage medium is necessary to meet the EV load characteristics of high-energy density and high-power density. This EV storage system is made up of two complementing sources: chemical batteries and ultracapacitors/supercapacitors. The benefits of using ultracapacitors in a hybrid energy storage system (HESS) to meet the low-power electric car dynamic load are explored in this study. In this paper, a HESS technique for regulating the active power of low-powered EV simulations was tested in a MATLAB/Simulink environment with various dynamic loading situations. The feature of this design, as noted from the simulation results, is that it efficiently regulates the DC link voltage of an EV with a hybrid source while putting minimal load stress on the battery, resulting in longer battery life, lower costs, and increased vehicle range.

A life test of ultrasonic motors under different torque loads and the analysis of the characteristics of wearing surfaces

2019 ◽  
Vol 234 (5) ◽  
pp. 770-777
Author(s):  
Liwei Zhang ◽  
Huiming Zheng ◽  
Shouqing Huang ◽  
Wu Zhang ◽  
Fangyong Li ◽  
...  
Keyword(s):  
Early Time ◽  
Life Time ◽  
High Energy ◽  
Friction Material ◽  
Ultrasonic Motor ◽  
High Energy Density ◽  
Life Test ◽  
Wear Process ◽  
Ultrasonic Motors ◽  
Start Up

Without a coil and a gearbox, an ultrasonic motor has an important application in space engineering and so forth with advantages of light weight, small volume, less electromagnetic radiation, fast dynamic response, and high energy density. However, the obvious friction and wear between the stator and the friction material (as a part of the shaft assembly) restrict the reliability and life time of the ultrasonic motor. In this paper, a life test of ultrasonic motors is designed and carried out for 3041.7 h, and the eight motors are divided into four groups with torque loads of 0.03 Nm, 0.09 Nm, 0.16 Nm, and 0.21 Nm in the test. The evolution characteristics of the displacement frequency response and the wear on the stator contact surface under different torque loads during the wear process are analyzed. Some start-up problems occur during the early time in the life test are found and explained based on a meshing effect between the stator and the friction material, and some targeted suggestions are proposed to overcome the problems. The study can help to understand the wear failure mechanism and characteristics of ultrasonic motors.

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