scholarly journals Working Mechanism of Nonresonance Friction in Driving Linear Piezoelectric Motors with Rigid Shaking Beam

2018 ◽  
Vol 2018 ◽  
pp. 1-10
Author(s):  
Xifu Chen ◽  
Qian Lu ◽  
Weiqing Huang ◽  
Yin Wang
Keyword(s):  
Numerical Analysis ◽  
Normal Vibration ◽  
Low Cost ◽  
Theoretical Data ◽  
Friction Model ◽  
Working Mechanism ◽  
Ultrasonic Motors ◽  
Vibration Model ◽  
Piezoelectric Motors ◽  
Output Characteristics

A kind of nonresonance shaking beam motors is proposed with the advantages of simple structure, easy processing, and low cost due to its wide application prospects in precision positioning technology and precision instruments. The normal vibration model between the stator and slider is divided into contact and noncontact types to investigate the nonresonance friction drive principle for this motor. The microscopic kinematics model for stator protruding section and the interface friction model for motor systems during both operating stages are established. Accordingly, the trajectory of the stator protruding section consists of two different elliptical motions, which differ from those of resonance-type motors. The output characteristic of the nonresonance shaking beam motor is proposed under steady working conditions with reference to the research method of standing-wave-type ultrasonic motors. Numerical analysis is used to simulate the normal vibration and mechanical output characteristics of the motor. Experimental and theoretical data fitting validates the numerical analysis results and allows the future optimization of nonresonance-type motors.

scholarly journals Numerical analysis of effects of an open-pit coal mine to groundwater

2019 ◽  
Vol 4 (2) ◽  
pp. 70-74
Author(s):  
Viktória Mikita ◽  
Balázs Kovács
Keyword(s):  
Numerical Analysis ◽  
Coal Mine ◽  
Cost Efficiency ◽  
Low Cost ◽  
Open Pit ◽  
Contaminated Sites ◽  
Coal Basin ◽  
Contaminant Plumes ◽  
Key Factor ◽  
Groundwater Regime

In this study we investigated the hydrogeological problems of an open-pit brown coal mine in the Borsod coal basin with Processing Modflow software. The coal mine is located in the valley of the Sajó-river with high transmissivity overburden layer where the traditional dewatering solutions were not encouraging due to inrush risks and low cost-efficiency. A new way of barrier forming was found out and numerically simulated to prove the efficiency of the solution. Since there are several contaminated sites in the surroundings it was a key factor to assure that the new mine dewatering technique has only a negligible effect on the groundwater regime that undisturbs the known contaminant plumes nearby.

Performance Optimization Based Spectrum Analysis on Optical Fiber Raman Amplifier with Backward Pumping

2012 ◽  
Vol 263-266 ◽  
pp. 1004-1007 ◽  
Author(s):  
Li Ying Liu ◽  
Yan Huang ◽  
Chun Yu Liu ◽  
Xin Ming Zhang ◽  
Jiu Ru Yang
Keyword(s):  
Optical Fiber ◽  
Spectrum Analysis ◽  
Performance Optimization ◽  
Low Cost ◽  
Low Complexity ◽  
Gain Bandwidth ◽  
Raman Amplifier ◽  
Fiber Raman Amplifier ◽  
Output Performance ◽  
Output Characteristics

Optical fiber Raman amplifier (OFRA) with wide and flat gain bandwidth has been widely applied in the fields of optical communication, sensing and measurement. However, the performance optimization is always one of the hot topics in the study of OFRA, because its output characteristics are hardly dependent to some key designing parameters. In this paper, to overcome the problems above, we adopt a spectrum analysis based method to study the output performance of an OFRA system with backward pumping. By simulating the operation of the OFRA system, its output characteristics are first showed easily, with the advantages of real time, low cost, and low complexity. Further, according to the numerical results obtained, the optimal parameters of an OFRA system are determinate, and the performance in terms of output power, signal noise ratio, and the level of gain flatness is improved and optimized obviously.

scholarly journals Effects of introducing low-cost high-speed rail on air-rail competition: Modelling and numerical analysis for Paris-Marseille

2020 ◽  
Vol 99 ◽  
pp. 145-162
Author(s):  
Yixiao Wang ◽  
Luoyi Sun ◽  
Ruud H. Teunter ◽  
Jianhong Wu ◽  
Guowei Hua
Keyword(s):  
Numerical Analysis ◽  
High Speed ◽  
Low Cost ◽  
High Speed Rail

scholarly journals Development, Kinematic Modeling and Analysis of 3 (DoF) Pneumatic Gantry Robot

2020 ◽  
Vol 5 (6) ◽  
pp. 646-650
Author(s):  
Awad Eisa G. Mohamed ◽  
Abuobeida Mohammed Elhassan
Keyword(s):  
Controller Design ◽  
Low Cost ◽  
Weight Ratio ◽  
Friction Model ◽  
Pneumatic Cylinder ◽  
Kinematic Modeling ◽  
Low Friction ◽  
Modeling And Analysis ◽  
Gantry Robot ◽  
Pneumatic Cylinders

Low friction pneumatic cylinders are now being considered in applications for which only electric motors or hydraulics were previously considered suitable. One potential application of low friction pneumatics is robotic for metallurgical operations where the high power to weight ratio and low cost could be exploited. As part of an ongoing project to develop a pneumatic robot, this paper presents the kinematic analysis of pneumatic cylinder characteristics that simplifies controller design. Using mathematical modeling and simulation, non-linearity of modern pneumatic systems have been investigated. The derived models give an excellent representation of the system, despite the inclusion of a simplified friction model.

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.

A Novel Approach to Improving the Available Power Output of Piezoelectric Ultrasonic Motors

2004 ◽  
Author(s):  
R. M. Tieck ◽  
G. P. Carman
Keyword(s):  
Power Output ◽  
Contact Layer ◽  
Friction Forces ◽  
Ultrasonic Motors ◽  
Novel Approach ◽  
Baseline Testing ◽  
Limited Power ◽  
Industrial Use ◽  
Output Characteristics ◽  
Piezoelectric Ultrasonic Motor

Piezoelectric actuators have attractive operating properties because they do not generate electromagnetic fields and are not affected by them, and their power output characteristics scale linearly with decreasing size. These actuators have not seen widespread industrial use, however, because they have shown a limited power output. This work presents the initial efforts to increase the available power output of the Piezoelectric Ultrasonic Motor (PUSM). Commercially available PUSMs are limited by the small friction forces generated at the rotor/stator interface. Small friction is generated because current PUMs use rubber or polyimides on the rotor to create as the contact with the stator. Traditionally, PUSM contact material has consisted of rubber or reinforced polyimides. The authors intend to replace the traditional contact layer with a compliant super-elastic Nickel-Titanium (NiTi) thin film shape memory alloy (SMA) layer to increase the available power output by increasing the friction forces at the rotor/stator interface, without significantly increasing the size or weight of the actuator. The unmodified motors were baselined tested, modified, tested and the results compared. Recommendations are made with regard to the results of the modified baseline testing and possible implementation of micromachined ‘teeth’ configurations.

scholarly journals Aptamer-Based Biosensing with a Cationic AIEgen

2019 ◽  
Vol 72 (8) ◽  
pp. 620 ◽  
Author(s):  
Tracey Luu ◽  
Mengjie Liu ◽  
Yilong Chen ◽  
Roozbeh Hushiarian ◽  
Anthony Cass ◽  
...  
Keyword(s):  
High Selectivity ◽  
Low Cost ◽  
Protein Detection ◽  
Specific Protein ◽  
Personal Health ◽  
Fluorescence Signal ◽  
Portable Devices ◽  
Dye Molecules ◽  
Working Mechanism ◽  
Aptamer Sequence

Fabrication of low-cost biosensing platforms with high selectivity and sensitivity is important for constructing portable devices for personal health monitoring. Herein, we report a simple biosensing strategy based on the combination of a cationic AIEgen (aggregation-induced emission fluorogen), TPE-2+, with an aptamer for specific protein detection. The target protein can displace the dye molecules on the dye–aptamer complex, resulting in changes in the fluorescence signal. Selectivity towards different targets can be achieved by simply changing the aptamer sequence. The working mechanism is also investigated.

scholarly journals Polyoxometallic chemistry towards all-in-one layered double hydroxides for boosting oxygen evolution electrocatalysis

2021 ◽  
Author(s):  
Zhengyang Cai ◽  
Ping Wang ◽  
Ya Yan ◽  
Jiangwei Zhang ◽  
Xianying Wang
Keyword(s):  
Oxygen Evolution ◽  
Layered Double Hydroxides ◽  
High Performance ◽  
Large Scale ◽  
Low Cost ◽  
Theoretical Data ◽  
Water Electrolysis ◽  
Active Species ◽  
Nickel Iron ◽  
Double Hydroxides

Abstract Nickel-iron based layered double hydroxides (NiFe LDH) have attracted tremendous research and industrial interests for oxygen evolution reaction electrocatalysis (OER). However, methodologies on simultaneous multi-regulations remain scarce. Herein, we report a versatile polyoxometallic acids (POMs) etching approach for ingeniously designing NiFe LDH, including morphological nanolayers tailoring, reconfiguration of Fe3+ and α-Ni(OH)2 active species, creating multiple vacancies of Ni, Fe and O and manufacturing interlayered POM polyanionic clusters as surface kinetic accelerators. Our experimental and theoretical data reveal that the key influencing factors are simultaneously controlled, resulting in synergistical enhancement with electrocatalytic OER activity of η10 = 206 mV, stability (negligible change of η500 for 24 h), and turnover frequency value (TOFFe, mol) of 2.03 s− 1. To elucidate the evolution, we derive an empirical formula to quantitatively identifying the key performance-determining factors, coinciding with the work and most of literature data. The expression offers an opportunity for first and fast reliability on materials screening. Moreover, the electrocatalyst is further produced on a large scale with low cost and high performance, demonstrating its feasibility of promising configuration of NiFe LDH-PMo12(+) ‖ Ni@NiFe LDH(-) for practical anion-exchange membrane (AEM)-electrode-stack cells water electrolysis.

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