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Journal articles on the topic 'Motion of an electric stock'

Author: Grafiati

Published: 30 May 2022

Last updated: 31 July 2025

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1

Shlendov, Igor'. "Energy Unit Expenses of Trains with Asynchronous Electric Drive." Bulletin of scientific research results, no. 1 (March 30, 2022): 118–28. http://dx.doi.org/10.20295/2223-9987-2022-1-118-128.

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Objective: The assessment of energy effectiveness of traction drives for carriages of rolling stock models 81-765/766/767 and 81-556/557/558 (“NEVA”) from various producers and drafting technical requirements for drive electric equipment. Stock 81-765/766/767 uses asynchronous engine of 170 kW wattage and 43 Hz field rated frequency, 81-556/557/558 — 167 kW with 70 Hz rated frequency. Methods: The comparative analysis of drive energy indicators of trains with asynchronous electric drives has been accomplished in accordance with the calculation methodology. Measuring section was set in accordan

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Cheremisin, Vasily, Stanislav Istomin, and Artem Perestenko. "Artificial intelligence methods to control the energy efficiency of electric rolling stock online." E3S Web of Conferences 175 (2020): 05046. http://dx.doi.org/10.1051/e3sconf/202017505046.

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The international practices in organizing the energy consumption control of electric rolling stock are analyzed. As a result, it was concluded that currently the issue of organizing the energy consumption control of electric rolling stock is mainly solved by using analytical methods. These methods are based on designing the simulation models, which are usually based on the Pontryagin maximum principle. However, considering the development of recording systems for motion parameters of electric rolling stock, as well as other automated systems of Russian Railways, it seems promising to develop a

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3

Sulym, A., and P. Khozia. "MANAGEMENT STRATEGIES FOR ENERGY PROCESSES IN ELECTRIC ROLLING STOCK WITH ON-BOARD ENERGY STORAGE DEVICES." Collection of scientific works of the State University of Infrastructure and Technologies series "Transport Systems and Technologies" 1, no. 38 (2021): 63–79. http://dx.doi.org/10.32703/2617-9040-2021-38-63-6.

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The article deals with the main existing strategies for management strategy of energy exchange processes in the electric rolling stock with onboard capacitive energy storage devices. When considering strategies, it is assumed that the onboard capacitive storage has low power and capacitance. Therefore, this capacitor storage is not able to accept the full amount of regenerative braking energy of the electric rolling stock. The purpose of the paper is to consider and analyze management strategies for energy exchange processes in the electric rolling stock with onboard capacitive energy storages

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4

Panchenko, O. O., and Ye Ye Ten. "EXPRESS DIAGNOSTICS OF THE WHEELSET DEFECTS OF ELECTRIC ROLLING STOCK IN MOTION." Science and Transport Progress, no. 25 (December 25, 2008): 50–52. http://dx.doi.org/10.15802/stp2008/14349.

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5

Jamilov, Shukhrat, Otabek Ergashev, Muslim Abduvaxobov, Sobir Azimov, and Sherzamin Abdurasulov. "Improving the temperature resistance of traction electric motors using a microprocessor control system for modern locomotives." E3S Web of Conferences 401 (2023): 03030. http://dx.doi.org/10.1051/e3sconf/202340103030.

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Temperature control of traction electric motors running on direct current with the help of a modern microprocessor-based locomotive control system is analyzed in the paper. Development of a methodology for calculating the temperature of the windings of traction electric motors operating on direct current, based on a modern control system has been discussed. To determine the dependence of the temperature of traction motors on the motion profile and weight of the rolling stock.

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Istomin, Stanislav, and Andrey Shatohin. "Development of a method for determining the parameters of energy storage devices to ensure uninterrupted power supply for auxiliary needs of an electric train." Journal of Applied Engineering Science 22, no. 2 (2024): 342–50. http://dx.doi.org/10.5937/jaes0-42009.

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The aim of this article is to conduct experimental research to determine the energy storage parameters for providing uninterrupted power supply to the auxiliary needs of electric trains. Analytical power calculations for the auxiliary equipment of electric trains were performed based on the operating manual data. Additionally, a statistical method of data processing on the energy consumption of electric trains was applied. The operational fleet and service routes of the motor wagon depot TCh-31 Omsk and OAO "Omsk-Prigorod" of the West Siberian Railway were examined. The ED4M series electric tr

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Domin, Rostyslav, Iurii Domin, and Ganna Cherniak. "Estimation of dynamic performances of the safe operation of high-speed electric train." Archives of Transport 41, no. 1 (2017): 7–16. http://dx.doi.org/10.5604/01.3001.0009.7374.

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The process of implementation of new developments, in particular, new generation rolling stock holds a prominent place among the range of measures for organization of high-speed passenger rail transportation in Ukraine. The example of permission for use and the initial phase of work with interregional NRCS2 dual-mode electric trains produced by Hyundai-Rotem Corporation is the illustrative one in this context. Due to the detection of macro-cracks in bolster beams of the car body frames of these electric trains, namely in the areas of mounting of anti-yaw dampers, these trains were taken out of

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8

Tomilov, Valeriy Viktorovich, Sandugash Myrzabekovna Utepbergenova, and Oleg Alexeevich Sidorov. "Pantograph cooling system mathematical model during motion of the railway electric transport." Transport of the Urals, no. 2 (2020): 86–92. http://dx.doi.org/10.20291/1815-9400-2020-2-86-92.

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Uneven heating of the pantograph slide is the reason for limiting the pantograph removal of the maximum permissible long-term current from the contact network. The highest heating point is observed in the center of the pantograph head relative to the path axis, which can be taken into account when developing a pantograph slide cooling device. Existing models of the thermal state of the pantograph slide do not describe the transient modes of distributed heating of a closed-type structure (euro pantograph head) as a result of the impact of a contact wire in the plan when moving a rolling stock.

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9

Hascoet, J. Y., K. P. Karunakaran, and S. Marya. "Additive Manufacturing Viewed from Material Science: State of the Art & Fundamentals." Materials Science Forum 783-786 (May 2014): 2284–89. http://dx.doi.org/10.4028/www.scientific.net/msf.783-786.2284.

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Additive Manufacturing (AM), also designated as 3D Printing (3DP), is one of the most visionary and friendly approaches for flexible manufacturing with conservation of energy and material resources. It is a factory in a box that can generate multiple objects. It requires little manpower to bring virtual innovations into the real world. AM for metals can be mechanistically associated with welding. The technique employs a variety of energy sources (laser, electron beam, electric Arc, ...), feed stocks (powder, wire and ribbon) and motion kinematics & control (articulated robot and 3-5 axes C

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Hascoet, J. Y., K. P. Karunakaran, and Surendar Marya. "Additive Manufacturing Viewed from Material Science: State of the Art & Fundamentals." Materials Science Forum 783-786 (May 2014): 2347–52. http://dx.doi.org/10.4028/www.scientific.net/msf.783-786.2347.

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Additive Manufacturing (AM), also designated as 3D Printing (3DP), is one of the mostvisionary and friendly approaches for flexible manufacturing with conservation of energy andmaterial resources. It is a factory in a box that can generate multiple objects. It requires littlemanpower to bring virtual innovations into the real world. AM for metals can be mechanisticallyassociated with welding. The technique employs a variety of energy sources (laser, electron beam,electric Arc, …), feed stocks (powder, wire and ribbon) and motion kinematics & control(articulated robot and 3-5 axes CNC machi

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11

Falendysh, Anatoly, Volodymyr Dzhus, Olha Kletska, Oleg Kosariev, and Jan Dizo. "Model for building traction information of suburban rolling stock on hydrogen fuel." MATEC Web of Conferences 294 (2019): 01010. http://dx.doi.org/10.1051/matecconf/201929401010.

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The materials consider the possibility of using hydrogen as a fuel for suburban rolling stock in Ukraine. The analysis of the use of hydrogen fuel in transport in various countries of the world is carried out. One of the main stages of calculating the rolling stock is the construction of its traction characteristic, which largely depends on the type of power plant. Therefore, a model has been developed for constructing traction characteristics of a suburban rolling stock when it is converted to hydrogen fuel. For this purpose, an analysis of power equipment with an energy source from a polymer

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12

Xromova, Galina Alekseyevna, and Dildora Zufar kizi Muxsimova. "MODERNIZATION OF ELECTRIC TRACTION MOTOR SUPPORTS TO THE BOGIE FRAME FOR ELECTRIC ROLLING STOCK." Eurasian Journal of Academic Research 1, no. 9 (2022): 698–701. https://doi.org/10.5281/zenodo.5813594.

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13

Panchenko, O. O. "THE DIAGNOSIS OF THE WHEELSET CONGESTION OF ELECTRIC ROLLING STOCK IN MOTION AND ITS IMPACT ON SUPERSTRUCTURE." Science and Transport Progress, no. 25 (December 25, 2008): 46–49. http://dx.doi.org/10.15802/stp2008/14346.

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The method of complex determination of locomotive weight and its dynamic effects on superstructure of railway track on the basis of automated measuring systems having no cargo platform devices is offered.

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14

Berdiyev, U., U. Sulaymonov, F. Hasanov, and U. Berdiyorov. "ENERGY-EFFICIENT ELECTRIC DRIVE BASED ON COMPOSITE MATERIALS FOR AUXILIARY UNITS OF ELECTRIC ROLLING STOCK." Scientific heritage, no. 90 (June 6, 2022): 119–23. https://doi.org/10.5281/zenodo.6616198.

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This article considers the issue of one of the priority areas of energy-efficient electric drives for auxiliary units of electric rolling stock based on composite materials. Currently, various DC and AC motors are used for auxiliary units of electric rolling stock. In order to efficiently use the electrical energy supplied through the power supply system and many advantages from the control side, cost reduction, productivity increase, energy efficiency, and high quality of the produced or processed material, asynchronous motors with a squirrel-cage motor are mainly used. In work to improve the

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15

H., K. HETMAN, and L. MARIKUTSA S. "SELECTION OF RATIONAL PARAMETERS OF THE NOMINAL MODE ELECTRIC TRAINS WITH ASYNCHRONOUS TRACTION DRIVE." Science and Transport Progress, no. 3(69) (June 20, 2017): 56–65. https://doi.org/10.15802/stp2017/104767.

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<strong>Purpose. </strong>Parameters of the nominal mode are related to the most important performance indicators of traction means, therefore, the problems of choosing their optimal values always inevitably arise when forming technical requirements for a new rolling stock. The paper describes the features of solving the above-mentioned problems for electric trains with an asynchronous traction drive in the case of two-zone and three-zone frequency control of power. <strong>Methodology. </strong>Power of nominal mode of the rolling stock should be chosen in such a way that it wo

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Smerdin, Alexander, Yury Demin, and Alexander Ryzhkov. "Improvement of the method of calculation of the parameters of the universal current collector with the increased motion speeds." MATEC Web of Conferences 239 (2018): 01040. http://dx.doi.org/10.1051/matecconf/201823901040.

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The paper considers the main stages of development of a computer model of current collectors of an electric rolling stock. The original description of the kinematic scheme of a universal measuring current collector with the subsequent implementation of mathematical model in Matlab SimMechanics environment is offered. The model is based on the use of the method of homogeneous coordinates to represent the kinematic scheme of the current collector. It is shown that the computer model accurately and adequately describes the processes occurring with the current collector, is a universal instrument

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17

Kamalov, Ikram Saidakbarovich, and Akmal Akhror ugli Hayitboev. "RESEARCH OF HIGH-SPEED MODES OF HIGH-SPEED ELECTRIC ROLLING STOCK." Eurasian Journal of Academic Research 1, no. 9 (2022): 690–93. https://doi.org/10.5281/zenodo.5813577.

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Kamalov, Ikram Saidakbarovich, and Abdurauf Utamurat ugli Izbasarov. "FOREIGN EXPERIENCE IN CREATING ELECTRIC ROLLING STOCK WITH ASYNCHRONOUS TRACTION MOTORS." Eurasian Journal of Academic Research 1, no. 9 (2022): 694–97. https://doi.org/10.5281/zenodo.5813592.

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19

Yohanes, Yohanes, Erikson Siregar, Anita Susilawati, and Muftil Badri. "Performance Analysis of Flywheel Addition on Drive System of Rotary Friction Welding Machine." Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) 52, no. 1 (2018): 14–19. https://doi.org/10.36842/jomase.v52i1.46.

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Friction welding is a solid-state welding without the use of filler metal by using pressure method where by two workpieces to be connected. It is placed in contact and regulated relative motion in pressure, so that on the contact surface being heat (close to the metal liquid point), which form the metal connection. A friction welding machine in the laboratory of technology production of the University of Riau has some disadvantages, namely the electric motor as a driver head stock stems that are often damaged due to overheating such as excessive during welding. Thus was interfering with the we

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20

Yu, Yue Min. "Design and Analysis of a Micro-Motion Platform Based on Flexible Mechanism." Applied Mechanics and Materials 397-400 (September 2013): 1543–46. http://dx.doi.org/10.4028/www.scientific.net/amm.397-400.1543.

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Piezoelectric materials is a kind of the most common smart materials whose geometric shape can be related to an energy input in the form of electric field. In the application of active materials to electromechanical energy conversion, electrical energy may be input to the material and the resulting deformation of the material can be used to move a load. In this paper, a micro-motion platform is designed based straight circular flexure hinge and driven through piezoelectric ceramic stack. The calculation formula of the natural frequency of the new micro-motion platform structure is derived. Fro

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21

Mamaev, Sherali, Anna Anna, Shukurali Tursunov, Dilnoza Nigmatova, and Tokhir Tursunov. "Mathematical modeling of torsional vibrations of the wheel-motor unit of mains diesel locomotive UZTE16M." E3S Web of Conferences 401 (2023): 05014. http://dx.doi.org/10.1051/e3sconf/202340105014.

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The article considers methods for studying torsional vibrations of the wheel-motor block of a diesel locomotive UZTE16M. The diesel locomotives in question were modernized at the structural enterprise “O’ztemiryo’lmashta’mir” (Machine building and repair in Uzbekistan Railways company) under the joint-stock company “O’zbekiston temir yo’llari” (Uzbekistan railways). The authors of the article developed a dynamic model for the analysis of torsional vibrational movements that occur in the traction transmissions of the UZTE16M diesel locomotive, taking into account the geometric dimensions of the

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22

Yu, Yue Min. "Design and Analysis of a XY Micro-Motion Stage Based on S Type Flexible Mechanism." Applied Mechanics and Materials 635-637 (September 2014): 1216–19. http://dx.doi.org/10.4028/www.scientific.net/amm.635-637.1216.

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Piezoelectric materials is a kind of the most common smart materials whose geometric shape can be related to an energy input in the form of electric field. In the application of active materials to electromechanical energy conversion, electrical energy may be input to the material and the resulting deformation of the material can be used to move a load. In this paper, a XY micro-motion stage is designed based s type flexure mechanism and driven through piezoelectric ceramic stack. From the analysis, it can achieve X direction 6.5μm, Y direction 9.7μm micro-displacement output.The results indic

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23

Wołek, Marcin, Aleksander Jagiełło, and Michał Wolański. "Multi-Criteria Analysis in the Decision-Making Process on the Electrification of Public Transport in Cities in Poland: A Case Study Analysis." Energies 14, no. 19 (2021): 6391. http://dx.doi.org/10.3390/en14196391.

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Electromobility is one of the leading trends transforming public transport worldwide. Supported by international organizations, such as the European Union, and national cofounding, public transport operators and local authorities are taking strategic decisions on the direction and scope of the electrification of rolling stock. Most of the electric buses that are being put into operation replace the previously used conventional buses, and consequently, most of the electric buses are operating on existing bus lines. By applying a strategic approach to selecting bus routes for electrification, th

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24

Alekseeva, P. V., and K. V. Avdeeva. "Analyzing the factors affecting the protective potential of a metal underground construction, taking into account the impact of the motion of an electric rolling stock on a section." Herald of the Ural State University of Railway Transport, no. 3 (2023): 36–45. http://dx.doi.org/10.20291/2079-0392-2023-3-36-45.

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The analysis of the factors affecting the protective potential of a metal underground construction during the motion of the locomotive on the section is carried out. A graphical representation of the factors affecting the magnitude of the protective potential of the DF (drainage facility) of a MUC is given. The factors influencing the protective potential of the MUC when driving along the section of the West Siberian Railway are grouped. The first group of factors - the locomotive parameters - includes current, speed, mass, locomotive type, train formation and locomotive coordinate. By means o

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25

Vyacheslav, Shavkun, Pavlenko Tatyana, and Kozlova Olha. "DEVELOPMENT OF ALGORITHMIC MODELS FOR RESEARCH OF RELIABILITY PARAMETERS OF TROLLEYBUS TRACTION ELECTRIC MOTORS IN THE OPERATION PROCESS." EUREKA: Physics and Engineering 2 (March 31, 2020): 39–46. https://doi.org/10.21303/2461-4262.2020.001174.

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The analysis of the reliability parameters of traction engines during the operation of trolleybuses in different modes is done. The presented groups of operational factors are lead to the emergence of censored samples. The methods of express analysis of engine reliability using technical diagnostic tools are determined. A block diagram of an algorithmic model for studying the reliability parameters of traction electric motors of trolleybuses during operation has been developed. It allows at any time to evaluate the influence of operational factors on the reliability indicators of traction

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26

Smith, Ray T., Stephen Taylor, and Simon Maher. "Modelling electromagnetic induction via accelerated electron motion." Canadian Journal of Physics 93, no. 7 (2015): 802–6. http://dx.doi.org/10.1139/cjp-2014-0366.

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The two forms of electromagnetic induction are generally referred to as motional and transformer induction, and although these phenomena have been observed and discussed for well over 150 years, certain aspects remain controversial in the scientific literature. It is well-known that an electromotive force (emf) is induced in a loop of wire encircling a long solenoid carrying alternating current. This is true however even in a region in which there is a negligibly small magnetic or electric field. Although the flux linking concept can explain the induced emf, more recent explanations utilise th

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27

Echenausía-Monroy, José Luis, Eric Campos, Rider Jaimes-Reátegui, Juan Hugo García-López, and Guillermo Huerta-Cuellar. "Deterministic Brownian-like Motion: Electronic Approach." Electronics 11, no. 18 (2022): 2949. http://dx.doi.org/10.3390/electronics11182949.

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Brownian motion is a dynamic behavior with random changes over time (stochastic) that occurs in many vital functions related to fluid environments, stock behavior, or even renewable energy generation. In this paper, we present a circuit implementation that reproduces Brownian motion based on a fully deterministic set of differential equations. The dynamics of the electronic circuit are characterized using four well-known metrics of Brownian motion, namely: (i) Detrended Fluctuation Analysis (DFA), (ii) power law in the power spectrum, (iii) normal probability distribution, and (iv) Mean Square

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Wang, D. W., M. X. Liu, W. J. Qian, X. Wu, Q. Ma, and Z. Q. Wu. "Parametrical Investigation of Piezoelectric Energy Harvesting via Friction-Induced Vibration." Shock and Vibration 2020 (February 19, 2020): 1–32. http://dx.doi.org/10.1155/2020/6190215.

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In this work, piezoelectric energy harvesting performance via friction-induced vibration is investigated numerically. A one-degree-of-freedom friction system with a piezoelectric element is proposed, to study the piezoelectric energy harvesting via friction-induced stick-slip vibration. Subsequently, a two-degree-of-freedom friction system with two piezoelectric elements is proposed, to investigate the piezoelectric energy harvesting via model coupling vibration. Results show that regardless of the friction systems, it is feasible to convert friction-induced vibration energy to electrical ener

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29

Kuzyshyn, A. Ya, V. V. Kovalchuk, and Yu H. Sobolevska. "A Spatial Mathematical Model of the Dynamic Behavior of Modern Rolling Stock in High-Speed Traffic." Science and Transport Progress, no. 4(108) (December 17, 2024): 55–66. https://doi.org/10.15802/stp2024/318409.

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Purpose. The paper aims to develop a spatial mathematical model of the high-speed electric train EKr-1 “Tarpan” taking into account the design features of its first and second stages of spring suspension. Methodology. The design scheme of the electric train is taken as a set of 7 solids connected by ligaments of different rheology. Each of the bodies performs spatial oscillations. In this case, the wheel set is considered as a system with two degrees of freedom (lateral displacement and wagging). The angular and linear displacements of the bodies are considered as generalized coordinates. The

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Tomilov, V. V., O. A. Sidorov, and S. M. Utepbergenova. "The impact of the enhanced zigzag of a contact wire on distribution of the heating power of a pantograph slide of the main electric rolling stock." Transport of the Urals, no. 2 (2023): 101–7. http://dx.doi.org/10.20291/1815-9400-2023-2-101-107.

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The objective of the study presented in the article is to improve the mathematical model for calculating power losses in a pantograph slide, in particular, taking into consideration the enhanced values of a contact wire zigzag during the motion of an electric rolling stock. The subject of the study is a pantograph slide. The article provides an example for calculating the slide of a pantograph equipped with carbon inserts, illustrating that the heating of the entire structure of the slide is performed stronger when a contact wire is in the extreme position of the enhanced zigzag, while the dis

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Sun, Haichao, Yunlai Shi, Xing Li, Qiang Wang, and Yuyang Lin. "Design and experimental performance of a novel piezoelectric inchworm actuator based on screw clamping principle." Review of Scientific Instruments 93, no. 10 (2022): 105006. http://dx.doi.org/10.1063/5.0108473.

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The requirements of large thrust in bidirectional motion, high specific power (power/weight ratio), reliable self-locking at power off state, and compact size envelope for various applications of existing piezoelectric actuators are still urgent. To address these challenges, this study makes full use of the piezoelectric material’s excellent dynamic performance, robust force output, and high energy density to propose a novel inchworm piezoelectric actuator, which relies on the alternate clamping of two nuts independently rotated by two ultrasonic motors on a feed-screw in accordance with a pie

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Novarina, Diya, Eko Swistoro, M. Lutfi Firdaus, and Rosane Medriati. "Inovasi Sistem Stack Microbial Fuel Cell menggunakan Substrat Limbah Rumen Sapi serta Implementasinya sebagai Media Pembelajaran." PENDIPA Journal of Science Education 2, no. 2 (2018): 188–95. http://dx.doi.org/10.33369/pendipa.2.3.188-195.

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ABSTRACT[Innovation of microbial fuel cell stack system using cow rumen waste substrate and its implementation as a learning media]. The aims of this study are to: 1) describe the difference of Electric Motion (GGL), 2) describe the difference of electric power per unit area of the anode (Pa) which is produced between the series design MFC type series, parallel, mixed type 1 and mixed type 2, and 3) describe the significant difference of learning outcomes between the PBL learning model using MFC media with PBL learning model by using the electrical kit medium on dynamic electrical concept in S

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Tang, Zhaoping, Zhenyan Chen, Jianping Sun, Menghui Lu, and Hui Liu. "Noise Prediction Study of Traction Arc Tooth Cylindrical Gears for New Generation High-Speed Electric Multiple Units." Lubricants 11, no. 9 (2023): 357. http://dx.doi.org/10.3390/lubricants11090357.

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As the speed of the new generation of high-speed electric multiple units (EMU) increases, the requirements for vibration and noise reduction in traction gear trains are becoming higher and higher. Although most researchers have focused on the vibration mechanics analysis of gears, the actual noise has the most direct impact on passenger experience and safety. To address this problem, a new type of curved cylindrical gear is proposed to analyze the dynamic characteristics of the gear pair and predict its radiated noise based on the acoustic-vibration coupling theory using the finite element-bou

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Titova, Tamila, and Andrey Evstafev. "Energy efficiency improvement of locomotives with energy storages." Proceedings of Petersburg Transport University, no. 2 (2017): 200–210. http://dx.doi.org/10.20295/1815-588x-2017-2-200-210.

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Objective: The development of hybrid technologies is an aspect that carries serious changes for the railway industry, its design and technological base. These changes provide the scientific and technological breakthroughs to a much greater extent than the implementation of any new projects in traditional forms. Methods: Of great interest is the solution to the problem of hybrid locomotives and related power supply interaction. In addition, there are problems of quality and reliability of the rolling stock. The relationship between the three sets of technology, as well as the problem of support

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Araujo, George, Zhaoyi Zheng, Jae Jong Oh, and Jay X. Tang. "Assessment of a Weak Mode of Bacterial Adhesion by Applying an Electric Field." Applied Microbiology 1, no. 2 (2021): 255–69. http://dx.doi.org/10.3390/applmicrobiol1020019.

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Microbial attachment to surfaces is ubiquitous in nature. Most species of bacteria attach and adhere to surfaces via special appendages such as pili and fimbriae, the roles of which have been extensively studied. Here, we report an experiment on pilus-less mutants of Caulobacter crescentus weakly attached to polyethylene surface. We find that some individual cells transiently but repeatedly adhere to the surface in a stick-slip fashion in the presence of an electric field parallel to the surface. These bacteria move significantly slower than the unattached ones in the same field of view underg

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Yu, Yu Min. "Design and Analysis of a Piezoelectric Actuator." Advanced Materials Research 308-310 (August 2011): 2131–34. http://dx.doi.org/10.4028/www.scientific.net/amr.308-310.2131.

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Active materials are a group of solid-state materials whose geometric shape can be related to an energy input in the form of heat, light, electric field, or magnetic field. In the application of active materials to electromechanical energy conversion, electrical energy may be input to the material and the resulting deformation of the material can be used to move a load. The most common active materials used in actuators are piezoelectrics, magnetostrictives, and SMAs. In this paper, a piezoelectric actuation concept is presented that uses a new feed-screw motion accumulation technique. The fee

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Chang, Y. J., and D. Kuhlmann-Wilsdorf. "Effects of Ambient Gases on Friction and Interfacial Resistance." Journal of Tribology 110, no. 3 (1988): 508–15. http://dx.doi.org/10.1115/1.3261660.

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As is well known, ambient atmospheres can greatly affect the friction and wear behavior of metals sliding on each other, as well as the electric contact resistance between the metals. In order to better understand the mechanisms of those effects of ambient atmospheres, the coefficient of friction and the electric contact resistance have been studied for bundles of 50 micrometer thick copper wires, sliding on a polished copper surface in a specialized apparatus, called the hoop apparatus. The ambient gas was cycled between laboratory air and carbon dioxide, and between laboratory air and argon,

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Chow, W. K., and J. H. Zhao. "Scale modeling studies on stack effect in tall vertical shafts." Journal of Fire Sciences 29, no. 6 (2011): 531–42. http://dx.doi.org/10.1177/0734904111410657.

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Natural ventilation was provided by tall vertical shafts such as solar chimney while designing some green buildings. For buildings with a tall vertical shaft located in very cold countries, measured pressure difference due to stack effect was up to 300 Pa. Air motion induced by stack effect would give adequate ventilation flow rate. However, stack effect would also give adverse effect if not utilized properly in this green design. Smoke would spread faster to other parts of the building in an accidental fire. Therefore, estimations of stack pressure by simple hydrostatic equation used to be cr

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Battiston, Adrian, Inna Sharf, and Meyer Nahon. "Attitude estimation for collision recovery of a quadcopter unmanned aerial vehicle." International Journal of Robotics Research 38, no. 10-11 (2019): 1286–306. http://dx.doi.org/10.1177/0278364919867397.

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An extensive evaluation of attitude estimation algorithms in simulation and experiments is performed to determine their suitability for a collision recovery pipeline of a quadcopter unmanned aerial vehicle. A multiplicative extended Kalman filter (MEKF), unscented Kalman filter (UKF), complementary filter, [Formula: see text] filter, and novel adaptive varieties of the selected filters are compared. The experimental quadcopter uses a PixHawk flight controller, and the algorithms are implemented using data from only the PixHawk inertial measurement unit (IMU). Performance of the aforementioned

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Saginus, Kyle A., Richard W. Marklin, and Phillip A. Voglewede. "Dynamic Modeling of Hand Push Force to Close a Disconnect Switch at Switching Stations and Substations." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 53, no. 14 (2009): 902–6. http://dx.doi.org/10.1177/154193120905301410.

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Electric utility switching stations and substations in the U.S. typically have hundreds of disconnect switches in outdoor yards that are manually closed and opened. For safety reasons, these switches are usually located at least 10 ft above the ground and require specialized methods to open and close the switch. The most common manual method to open or close a disconnect switch is through the use of an insulated pole that ranges from 6 to 20 ft long. Due to the shear number of required independent tasks (workers may have to open or close 100 disconnect within 30 min), the manual opening and cl

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Azam, Shoaib, Farzeen Munir, Ahmad Muqeem Sheri, Joonmo Kim, and Moongu Jeon. "System, Design and Experimental Validation of Autonomous Vehicle in an Unconstrained Environment." Sensors 20, no. 21 (2020): 5999. http://dx.doi.org/10.3390/s20215999.

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In recent years, technological advancements have made a promising impact on the development of autonomous vehicles. The evolution of electric vehicles, development of state-of-the-art sensors, and advances in artificial intelligence have provided necessary tools for the academia and industry to develop the prototypes of autonomous vehicles that enhance the road safety and traffic efficiency. The increase in the deployment of sensors for the autonomous vehicle, make it less cost-effective to be utilized by the consumer. This work focuses on the development of full-stack autonomous vehicle using

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Jeong, Soo-Jin, Ji-hoon Kang, Seong-Joon Moon, and Gum-su Lee. "Transient and Dynamic Simulation of the Fluid Flow through Five-Way Electric Coolant Control Valve of a 100 kW Fuel Cell Vehicle by CFD with Moving Grid Technique." Actuators 13, no. 3 (2024): 110. http://dx.doi.org/10.3390/act13030110.

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In order to maintain the performance of a fuel cell vehicle, it is essential to maintain a constant temperature of the stack. Therefore, it is very important to distribute the optimal coolant flow rate to each major component under very diverse and rapidly changing dynamic operating conditions. The part responsible for this is a five-way electric coolant valve. Therefore, this study aims to investigate transient dynamic flow characteristics of the fluid flow through a five-way electric coolant valve (PCCV: Penta-Control Coolant Valve). To achieve this goal, this paper attempts a three-dimensio

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Nestler, Tina, William Förster, Stefan Braun, et al. "Energy Storage in crystalline Materials based on multivalent Ions." Acta Crystallographica Section A Foundations and Advances 70, a1 (2014): C365. http://dx.doi.org/10.1107/s205327331409634x.

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Energy conversion and storage has become the main challenge to satisfy the growing demand for renewable energy solutions as well as mobile applications. Nowadays, several technologies exist for the conversion of electric energy into e. g. heat, light and motion or vice versa. Among a large variety of storage concepts, the conversion of electrical in chemical energy is of great relevance in particular for location-independent use. Main factors that still limit the use of electrochemical cells are the volumetric and gravimetric energy density, cyclability as well as safety. The concept for a new

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Rizzoni, Raffaella, Michele Serpilli, Maria Letizia Raffa, and Frédéric Lebon. "A Micromechanical Model for Damage Evolution in Thin Piezoelectric Films." Coatings 13, no. 1 (2023): 82. http://dx.doi.org/10.3390/coatings13010082.

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Thin-film piezoelectric materials are advantageous in microelectromechanical systems (MEMS), due to large motion generation, high available energy and low power requirements. In this kind of application, thin piezoelectric films are subject to mechanical and electric cyclic loading, during which damage can accumulate and eventually lead to fracture. In the present study, continuum damage mechanics and asymptotic theory are adopted to model damage evolution in piezoelectric thin films. Our purpose is to develop a new interface model for thin piezoelectric films accounting for micro-cracking dam

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Kalivoda, Jan. "Simulation Analysis of an Electric Locomotive with a Hydraulic Wheelset Guidance System for Improved Performance in Curved Tracks." Machines 13, no. 4 (2025): 321. https://doi.org/10.3390/machines13040321.

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A reduction of forces acting between the railway track and the vehicle is one of the key issues in the design of modern rolling stock. Because the capabilities of reducing wheel–rail contact forces in track curves by conventional methods are encountered at their limits, innovative approaches in the design of vehicle suspension and wheelset guidance occur. Among them, an active wheelset steering appears to be very promising. However, an active wheelset steering system is rather complicated and expensive and raises many safety issues. Therefore, a passive hydraulic system that links longitudinal

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И. А., Пантелеев, Новиков В. А. та Окунев В. И. "ПРОСТРАНСТВЕННО-ВРЕМЕННЫЕ ЗАКОНОМЕРНОСТИ АКУСТИЧЕСКОГО ОТКЛИКА МОДЕЛЬНОГО ПРОТЯЖЕННОГО РАЗЛОМА НА ФЛЮИДНЫЕ И ЭЛЕКТРИЧЕСКИЕ ВОЗДЕЙСТВИЯ". ДИНАМИЧЕСКИЕ ПРОЦЕССЫ В ГЕОСФЕРАХ 16, № 3 (2024): 102–13. http://dx.doi.org/10.26006/29490995_2024_16_3_102.

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В статье приведены результаты экспериментов по воспроизведению процесса прерывистого скольжения по модельному разлому и инициирования подвижки борта разлома флюидными и электрическими воздействиями. Отличительной особенностью использованной экспериментальной установки является протяженный подвижный блок, позволяющий существенно увеличить площадь межблочного контакта, заполненного сухим мелкозернистым песком. Это позволило исследовать пространственную картину развития зон активного деформирования контактной зоны посредством решения задачи локации источников акустической эмиссии. Отдельное внима

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Karthigesu, Jeyavanan, Toshiaki Owari, Satoshi Tsuyuki, and Takuya Hiroshima. "UAV Photogrammetry for Estimating Stand Parameters of an Old Japanese Larch Plantation Using Different Filtering Methods at Two Flight Altitudes." Sensors 23, no. 24 (2023): 9907. http://dx.doi.org/10.3390/s23249907.

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Old plantations are iconic sites, and estimating stand parameters is crucial for valuation and management. This study aimed to estimate stand parameters of a 115-year-old Japanese larch (Larix kaempferi (Lamb.) Carrière) plantation at the University of Tokyo Hokkaido Forest (UTHF) in central Hokkaido, northern Japan, using unmanned aerial vehicle (UAV) photogrammetry. High-resolution RGB imagery was collected using a DJI Matrice 300 real-time kinematic (RTK) at altitudes of 80 and 120 m. Structure from motion (SfM) technology was applied to generate 3D point clouds and orthomosaics. We used di

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Tian, Xinqi, Weishan Chen, Yingxiang Liu, Jie Deng, and Kai Li. "Study on improving the resolution of an H-shaped piezoelectric ultrasonic actuator by stick-slip principle." Smart Materials and Structures 31, no. 1 (2021): 015001. http://dx.doi.org/10.1088/1361-665x/ac36b1.

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Abstract Improving the performance of the motion stages driven by piezoelectric actuators is an enduring topic for expanding their applications. For the motion stage with a travel range of tens of millimeters, trade-offs are inevitable between getting high speed (hundreds of millimeters per second) and high resolution (tens of nanometers), due to the inherent limitations of the operating principles of the piezoelectric actuators. In order to improve the output resolution of an H-shaped piezoelectric ultrasonic actuator, sawtooth excitation voltages are used in this work rather than the convent

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Fomin, Oleksij, Alyona Lovska, Andriy Klymash, and Mykhailo Keremet. "Improvement of covered wagons of the “East-West” type by sectioning with a partition." Eastern-European Journal of Enterprise Technologies 5, no. 7 (113) (2021): 36–43. http://dx.doi.org/10.15587/1729-4061.2021.239751.

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The dynamic loading and strength of the frame of the “East-West” type covered wagon were determined. To increase the efficiency of operation of covered wagons in international traffic, it is proposed to improve their frames. This improvement consists in using a sectional partition in the body in order to divide it into two separate sections. This allows the transportation of different goods in one wagon, and therefore decreasing empty mileage. The longitudinal loading of the covered wagon frame was determined. The case of shunting impact was considered. The studies were carried out in a flat c

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Sulym, A. "A METHODOLOGY TO SELECT ASYNCHRONOUS TRACTION ELECTRIC DRIVE FOR INNOVATIVE METRO ROLLING STOCK." Collection of scientific works of the State University of Infrastructure and Technologies series "Transport Systems and Technologies" 1, no. 37 (2021): 97–118. http://dx.doi.org/10.32703/2617-9040-2021-37-11.

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The paper deals with the justification of the need to use an asynchronous traction electric drive on the metro rolling stock. The advantages of using an asynchronous traction electric drive in comparison with a DC commutator motor drive are formulated. The characteristics of modern innovative metro rolling stock with asynchronous traction electric drive of domestic and foreign production are analyzed. Aspects of the choice of a variable frequency asynchronous traction electric drive for innovative rolling stock are formulated and the existing typical algorithm of such choice is given. The main

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