Investigation of the Traveling-Wave Oscillations of Piezoelectric Cylinder

2015 ◽  
Vol 220-221 ◽  
pp. 451-456
Author(s):  
Raimundas Lučinskis ◽  
Dalius Mažeika ◽  
Ramutis Bansevičius
Keyword(s):  
Traveling Wave ◽  
Piezoelectric Actuators ◽  
Radial Polarization ◽  
Modal Shape ◽  
Precise Positioning ◽  
Piezoelectric Cylinder ◽  
Advantages And Disadvantages ◽  
Contact Surfaces ◽  
Main Component ◽  
Walled Cylinder

Piezoelectric actuators are widely used for the nano/micro positioning and adjustment systems. In the paper, the investigation on the oscillations of contacting surfaces of the piezoelectric thick-walled cylinder is presented. Piezoelectric cylinder is the main component of piezomechanical system named as piezo-screw and is used to turn the screw. This investigated piezomechanical system can be used for the precise positioning with a high resolution (less than 50 nanometers). Piezoelectric cylinder has radial polarization. Traveling-wave oscillations of the second circumferential modal shape (n = 2, m = 1) are excited. Three different electrode topologies are used to drive the screw. Electrodes are grouped into upper and low groups in both topology cases. Each group consists of six electrodes where positions of corresponding electrodes in upper and lower group are shifted by π/6. Numerical investigation of the traveling wave oscillation is performed and dependencies oscillation trajectories of contact surfaces on excitation schemes are determined when three different electrode topologies are used. Dependency of oscillations of contacting points upon length of the actuator is analyzed as well. Advantages and disadvantages of each excitation case are discussed.

scholarly journals Study on the applications of two analytical methods for the construction of traveling wave solutions of the modified equal width equation

Open Physics ◽  
2020 ◽  
Vol 18 (1) ◽  
pp. 1003-1010
Author(s):  
Asıf Yokuş ◽  
Hülya Durur ◽  
Taher A. Nofal ◽  
Hanaa Abu-Zinadah ◽  
Münevver Tuz ◽  
...  
Keyword(s):  
Traveling Wave ◽  
Analytical Methods ◽  
Nonlinear Evolution ◽  
Nonlinear Partial Differential Equations ◽  
Traveling Wave Solutions ◽  
Dark Soliton ◽  
Mathematical Tool ◽  
Symbolic Calculation ◽  
Advantages And Disadvantages ◽  
Wave Solutions

Abstract In this article, the Sinh–Gordon function method and sub-equation method are used to construct traveling wave solutions of modified equal width equation. Thanks to the proposed methods, trigonometric soliton, dark soliton, and complex hyperbolic solutions of the considered equation are obtained. Common aspects, differences, advantages, and disadvantages of both analytical methods are discussed. It has been shown that the traveling wave solutions produced by both analytical methods with different base equations have different properties. 2D, 3D, and contour graphics are offered for solutions obtained by choosing appropriate values of the parameters. To evaluate the feasibility and efficacy of these techniques, a nonlinear evolution equation was investigated, and with the help of symbolic calculation, these methods have been shown to be a powerful, reliable, and effective mathematical tool for the solution of nonlinear partial differential equations.

scholarly journals Creep Rupture Analysis of Candidate Steels for the Traveling Wave Reactor

2018 ◽  
Author(s):  
Cheng Xu
Keyword(s):  
High Temperature ◽  
Yield Stress ◽  
Traveling Wave ◽  
Rupture Strength ◽  
Creep Rupture ◽  
Thermal Creep ◽  
Uniaxial Tensile ◽  
Advantages And Disadvantages ◽  
Analysis Methods ◽  
Best Estimate

TerraPower has developed sophisticated computational analysis tools to support the design and fabrication of high temperature components to be used in the Traveling Wave Reactor (TWR). One of the key material properties required to predict material damage and remaining lifetime of key in-reactor components is the thermal creep rupture time. Although TerraPower optimized ferritic-martensitic (FM) HT9 steel has shown consistent improvement in yield stress and creep rupture strength through uniaxial tensile tests, extrapolations of existing test data are still needed to fully support the complex analysis used in the TWR design. Traditional Larson-Miller analysis for creep rupture was used to compare the TerraPower optimized HT9 steel to the existing historical database. The results of the Larson-Miller analysis were compared to the results from the Wilshire analysis to explore the relative advantages and disadvantages of each method. The best estimate values for fitting constants and activation energies were determined for both methods, taking into account the effects of the higher yield stress observed in TerraPower optimized HT9 compared to historic HT9. Likewise, the best estimate creep rupture stresses for TerraPower optimized HT9 at various times and temperatures were determined by extrapolations using both the Larson-Miller and Wilshire analysis. The allowable stresses of historical and TerraPower optimized HT9 steels were compared to those of existing materials (9Cr-1Mo-V) in the ASME high temperature code. The comparison of analysis methods and rupture stresses demonstrate that TerraPower FM steel thermal creep performance and analysis methods are comparable to existing ASME qualified materials for high temperature applications.

Energy-carrying wave simulation of the Lonngren-wave equation in semiconductor materials

2021 ◽  
pp. 2150213
Author(s):  
Hülya Durur
Keyword(s):  
Wave Equation ◽  
Traveling Wave ◽  
Energy Transport ◽  
Three Dimensional ◽  
Traveling Wave Solutions ◽  
Traveling Wave Solution ◽  
Discussion Section ◽  
Advantages And Disadvantages ◽  
Wave Solutions ◽  
Package Program

In this study, the Lonngren-wave equation, which is physically semiconductor, is taken into consideration. Traveling wave solutions of this equation are presented with generalized exponential rational function method, which is one of the mathematically powerful analytical methods. These solutions are produced in bright (non-topological) soliton and complex trigonometric-type traveling wave solutions. Three-dimensional (3D), 2D and contour graphics are presented with the help of a ready-made package program with special values given to constants in these solutions. The effect of the change in wave velocity on the traveling wave solution showing energy transport is presented with the help of simulation. It is argued that velocity is one of the important factors in wave diffraction. In the results and discussion section, the advantages and disadvantages of the method are discussed.

Piezoelectric Actuators Used for Helicopter Vibration Reduction

2013 ◽  
Vol 718-720 ◽  
pp. 1729-1733
Author(s):  
Zhu Zhang ◽  
Wei Dong Yang ◽  
Da Lin Yang
Keyword(s):  
Vibration Reduction ◽  
Piezoelectric Actuators ◽  
Scaled Model ◽  
Helicopter Rotors ◽  
Bench Tests ◽  
Advantages And Disadvantages ◽  
Model Helicopter ◽  
Trailing Edge Flap ◽  
Drive And Control ◽  
And Control

This paper covers the development of two piezoelectric actuators for trailing edge flap control on mach scaled model helicopter rotors. The design, analysis and bench tests of these two actuators are described. Under different voltages and frequencies, their drive performances are tested and compared. Results showed that these two actuators all can effectively drive and control the flaps with each advantages and disadvantages.

scholarly journals The strategy of the combined sales as the modern instrument for enhancing the product distribution planning of enterprises on foreign markets

2021 ◽  
pp. 45-48
Author(s):  
Yuliia CHYRKOVA ◽  
Lesia BILETS
Keyword(s):  
Product Distribution ◽  
Manufacturing Companies ◽  
Economic Activities ◽  
Foreign Markets ◽  
Advantages And Disadvantages ◽  
Sales Strategy ◽  
Marketing Activities ◽  
Modern Economic ◽  
Main Component ◽  
General Product

Nowadays, sales activities are a determining component of the competitiveness of almost every enterprise engaged in foreign economic activities. In modern economic conditions and the strengthening of the world globalization process, more and more attention is paid to the distribution of export-oriented products as the main component of the enterprise marketing activities. To implement efficient distribution of products, first of all, it must be well planned. It's considered that it is exactly planning, which is the most important condition for the effective implementation of the marketing activities of the exporting enterprise. The aim of the work is to determine the essence of the combined sales strategy as an up-to-date tool for improving the planning of the products distribution at enterprises in the context of the intensification of activities in foreign markets. The analysis of the latest research and publications has been carried out. The “products distribution” concept is presented as the main component of the enterprise marketing activities. In general, product distribution is an enterprise's activity aimed at overcoming the spatial, temporal and quantitative commodity differences between the production and consumer spheres, which also includes the transfer of ownership of products to meet the needs of consumers and achieve the company's goals in target markets. Meanwhile, the combined marketing implies a combination of direct and indirect methods of the commodities promotion, that is, a manufacturer can form his own sales network, but at the same time does not refuse the services of intermediaries. The advantages and disadvantages of using this method for manufacturing companies were listed. It also describes the conditions under which it is advisable to use the strategy of combined sales, especially it concerns the companies in the conditions of export activation. The factors influencing the implementation of the combined sales strategy by the enterprise in the context of the intensification of activities in foreign markets are presented.

Charge pump controller for grounded piezoelectric actuators used in precise positioning

2011 ◽  
Vol 47 (15) ◽  
pp. 855 ◽  
Author(s):  
Y.T. Ma ◽  
Z.H. Feng ◽  
L. Huang ◽  
L.S. Zhang
Keyword(s):  
Charge Pump ◽  
Piezoelectric Actuators ◽  
Precise Positioning

scholarly journals Rectal Cancer - Sphincter Saving Techniques

2014 ◽  
Vol 60 (1) ◽  
pp. 11-14
Author(s):  
Russu C ◽  
Molnar C ◽  
Pantiru C ◽  
Sărăcuț C ◽  
Gherghinescu M ◽  
...  
Keyword(s):  
Rectal Cancer ◽  
Colorectal Anastomosis ◽  
Cross Sectional ◽  
Physical Trauma ◽  
Advantages And Disadvantages ◽  
Cancer Management ◽  
Sphincter Saving ◽  
Rectal Cancers ◽  
One Year ◽  
Main Component

Abstract Background: Rectal cancer management has as its main component the surgical treatment. The purpose of the paper is to point out the advantages and disadvantages of sphincter saving techniques, respecting the oncological principles. Material and method: A cross-sectional, retrospective study was performed on a group of 69 patients admitted and surgically treated for rectal cancers in the Surgical Clinic I of the County Emergency Clinical Hospital of Tîrgu Mureș, for a period of one year (April 2012 - April 2013) and to whom rectal resections were performed. We followed the immediate postoperative evolutions in these patients, making a comparative analysis between those with the sphincter saving surgery and those in which other operations were performed. Results: From the total of 69 patients diagnosed with rectal cancer, sphincter saving procedures with restoration of digestive continuity by coloanal anastomosis were performed in 12 patients (17.39%) using the peranal or transanal approach; in 42 patients (60.86%) anterior rectosigmoidian resections with low and very low colorectal anastomosis („very low” Dixon procedure) were performed. In 15 cases (21.74%) the Miles type of rectal resections, using the abdomino-perineal way, were performed. Out of the 12 cases with peranal or transanal anastomosis, 4 cases had postoperative complications. Conclusions: Rectal resection procedures, which are restoring the digestive tract continuity using low anastomosis (colorectal, coloanal, peranal or transanal), are representing viable and „physiological” alternatives, if they respect the oncologic principles. In well selected cases, the immediate postoperative evolution is favorable, relieving the patient from the psychological and physical trauma due to the presence of a colostomy

scholarly journals Information and communication technologies used at HEI during training of teachers of institutions of professional education

2020 ◽  
Vol 6 (Extra-B) ◽  
pp. 12-24
Author(s):  
Viktoriia Bilyk ◽  
Iryna Shcherbak ◽  
Tamara Otroshko ◽  
Roksolyana Shvay ◽  
Svitlana Heiko
Keyword(s):  
Information And Communication Technologies ◽  
Professional Education ◽  
Communication Systems ◽  
Communication Technologies ◽  
Advantages And Disadvantages ◽  
Information Technology Training ◽  
Rational Combination ◽  
Information And Communication ◽  
Higher Professional Education ◽  
Main Component

This research aimed to identify the basic problems and gaps in the process of introducing information and communication systems and technologies in institutions of higher professional education and to outline the possibilities of their later use as the main component of e-education. Research methods: systematization, generalization, comparative analysis, systems analysis, logical approach, synthesis. Results. Based on the analysis of the results of the introduction of information and communication technologies during the organization of training in higher professional education establishments, the urgency of using information technology training technologies was proven; the advantages and disadvantages of e-learning and distance (distance) education platforms were considered; it was distinguished which technical means of information communication systems and technologies were most effective under the condition of a rational combination of the most recent and traditionally existing means of teaching.  

Surface wave behavior and refraction simulation on the ocean for the fractional Ostrovsky–Benjamin–Bona–Mahony equation

2021 ◽  
pp. 2150477
Author(s):  
Serbay Duran ◽  
Asif Yokuş ◽  
Hülya Durur
Keyword(s):  
Traveling Wave ◽  
Traveling Wave Solutions ◽  
Stationary Wave ◽  
Traveling Wave Solution ◽  
Incoming Wave ◽  
Topological Soliton ◽  
Advantages And Disadvantages ◽  
Wave Event ◽  
Ostrovsky Equation ◽  
General Graphs

In this study, we have taken into account the time-fractional Ostrovsky–Benjamin–Bona–Mahony equation, which is a synthesis of the time-fractional Ostrovsky equation and time-fractional Benjamin–Bona–Mahony equations and contains both mathematical and physical properties. Traveling wave solutions are produced by using the Ostrovsky–Benjamin–Bona–Mahony equation that physically sheds light on the incoming wave event on the ocean surface, using the sub-equation and Bernoulli sub-equation function methods. These solutions are presented in hyperbolic, trigonometric, singular and dark (topological) soliton types. With the help of special values given to the coefficients in the solitons obtained, it is associated with the solutions in the literature and it is observed that the solitons produced in this study are more general. Graphs representing the stationary wave at any given moment are presented. The advantages and disadvantages as well as the similarities and differences of the method are discussed in detail. Also, the behavior of the wave and its refraction according to the velocity variable, which is a physically important factor of the traveling wave solution, is analyzed and supported by simulation.

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