scholarly journals Analysis of the problems of mechanical gearboxes of transport systems and their solution using a magnetic sensor

2021 ◽  
Vol 2021 (4) ◽  
pp. 561-570
Author(s):  
Yuri V. KRESELYUK ◽  
Keyword(s):  
Block Diagram ◽  
Practical Importance ◽  
Magnetic Sensor ◽  
Transport Systems ◽  
Transport Mechanisms ◽  
Traction Drive ◽  
Emergency Situations ◽  
The Media ◽  
The Cost ◽  
Electric Train

Objective: Increasing reliability of mechanical gearboxes using a magnetic sensor, which will sig nifi cantly increase the reliability of transport mechanisms and systems in general. Methods: An analysis of incidents covered in the media was carried out. Results: Conclusions are drawn about the consequences of failure of mechanical gearboxes. To prevent emergency situations caused by a breakdown of a mechanical gearbox, it is proposed to use a magnetic sensor, which allows carrying out analysis and diagnostics of the gearbox and its components during operation. A mathematical model of a magnetic sensor is compiled and a block diagram of a device for processing the output signal of the sensor modulator is presented. Practical importance: Failure of a mechanical gearbox is a common problem that leads to a stop of transport mechanisms and systems. Detection of a mechanical gearbox malfunction can signifi cantly reduce the cost of repairs, as well as prevent unexpected damage to the mechanism, which can lead to a complete stop of the transport system. The use of a magnetic sensor in the traction gearbox of an electric train will reduce the likelihood of a traction gearbox breakdown during operation and reduce the cost of repairs, increase the reliability of the traction drive, and also simplify the commissioning of new electric trains and traction gearboxes.

scholarly journals Linear asynchronous traction drive in urban rail and maglev transport systems

2020 ◽  
Vol 6 (4) ◽  
pp. 5-24
Author(s):  
Viktor V. Nikitin ◽  
Vladimir M. Strepetov
Keyword(s):  
Energy Conversion ◽  
Edge Effect ◽  
Edge Effects ◽  
Transport Systems ◽  
Rolling Stock ◽  
Traction Drive ◽  
Urban Rail ◽  
Longitudinal Edge ◽  
The World ◽  
The Cost

The development of transport infrastructure of large cities with high population density and development should be carried out on the basis of innovative technical solutions, that allow to simplify the conditions of laying of tracks, reduce the cost of construction, reduce noise, provide comfort to passengers and reduce the cost of operating rolling stock. One such solution, the effectiveness of which is confirmed by foreign experience, is the use of linear asynchronous traction drive (LATD) in urban rail and maglev transport systems. This, in particular, allows to increase the allowable value of slope paths to 6065, reduce the vertical dimensions of rolling stock to 3.15 m, reduce the diameter of the tunnel by 2530%. The release of the wheel pair from the function of the implementation of traction effort makes it possible to apply on the wagons the articulated semi-frames of trolleys, that ensures better rolling stock in curves, and as a result - less wear of wheels and rails and less noise. This article analyzes the advantages and disadvantages of LATD compared to the traction drive of traditional execution, considers variants of constructive performance of linear induction motors (LIM), processes of electromechanical energy conversion in LIM, the option of building a LATD control system is presented. The article examines the flat LIM, which have found use in the transport systems of major cities in Asia and America. The processes of energy conversion in LIM are distinguished by the presence of a longitudinal edge effect, which determines the distortion of the resulting magnetic field, which is manifested in the reduction of induction and the displacement of the peak of the induction distribution curve to the escaping edge of the inductor. This effect is particularly manifested in high-speed LIMs with high quality. When the linearity of the magnetic environment is allowed, the resulting electromagnetic force of the LIM can be considered as the sum of electromagnetic forces created by the main field, as well as the direct and reverse fields of the longitudinal edge effect. The edge effects reduce efficiency and power ratio of LIM. The article discusses ways to compensate for the edge effects, as well as an overview of the world experience of the use of LATD in rail and maglev transport systems. The advantages of LATD and the world experience of its use suggest that for urban transport systems at speeds of up to 100-120 km/h this drive can be a real competition to traditional urban rail systems.

scholarly journals ‘You wouldn’t get that from watching TV!’: Exploring audience responses to virtual reality non-fiction in the home

2020 ◽  
pp. 135485652097996
Author(s):  
David Philip Green ◽  
Mandy Rose ◽  
Chris Bevan ◽  
Harry Farmer ◽  
Kirsten Cater ◽  
...  
Keyword(s):  
Virtual Reality ◽  
New Media ◽  
Home Setting ◽  
Media Technologies ◽  
Non Fiction ◽  
Audience Responses ◽  
The Media ◽  
The Cost ◽  
Watching Tv ◽  
At Home

Consumer virtual reality (VR) headsets (e.g. Oculus Go) have brought VR non-fiction (VRNF) within reach of at-home audiences. However, despite increase in VR hardware sales and enthusiasm for the platform among niche audiences at festivals, mainstream audience interest in VRNF is not yet proven. This is despite a growing body of critically acclaimed VRNF, some of which is freely available. In seeking to understand a lack of engagement with VRNF by mainstream audiences, we need to be aware of challenges relating to the discovery of content and bear in mind the cost, inaccessibility and known limitations of consumer VR technology. However, we also need to set these issues within the context of the wider relationships between technology, society and the media, which have influenced the uptake of new media technologies in the past. To address this work, this article provides accounts by members of the public of their responses to VRNF as experienced within their households. We present an empirical study – one of the first of its kind – exploring these questions through qualitative research facilitating diverse households to experience VRNF at home, over several months. We find considerable enthusiasm for VR as a platform for non-fiction, but we also find this enthusiasm tempered by ethical concerns relating to both the platform and the content, and a pervasive tension between the platform and the home setting. Reflecting on our findings, we suggest that VRNF currently fails to meet any ‘supervening social necessity’ (Winston, 1996, Technologies of Seeing: Photography, Cinematography and Television. British: BFI.) that would pave the way for widespread domestic uptake, and we reflect on future directions for VR in the home.

Accountability and the Media

2014 ◽  
Vol 652 (1) ◽  
pp. 206-221
Author(s):  
Anton Harber
Keyword(s):  
South African ◽  
News Media ◽  
Media Access ◽  
Political Interference ◽  
The Face ◽  
Public Broadcaster ◽  
The Media ◽  
The Government ◽  
The Cost ◽  
Poor Management

Two decades of contestation over the nature and extent of transformation in the South African news media have left a sector different in substantive ways from the apartheid inheritance but still patchy in its capacity to fill the democratic ideal. Change came fast to a newly open broadcasting sector, but has faltered in recent years, particularly in a public broadcaster troubled by political interference and poor management. The potential of online media to provide much greater media access has been hindered by the cost of bandwidth. Community media has grown but struggled to survive financially. Print media has been aggressive in investigative exposé, but financial cutbacks have damaged routine daily coverage. In the face of this, the government has turned its attention to the print sector, demanding greater—but vaguely defined—transformation and threatened legislation. This has met strong resistance.

Transport Phenomena and Properties in Treelike Networks

2016 ◽  
Vol 68 (4) ◽  
Author(s):  
Peng Xu ◽  
Agus Pulung Sasmito ◽  
Boming Yu ◽  
Arun Sadashiv Mujumdar
Keyword(s):  
Transport Properties ◽  
Scaling Laws ◽  
Transport Phenomena ◽  
Transport Processes ◽  
Research Progress ◽  
Transport Systems ◽  
Transport Mechanisms ◽  
Branching Structures ◽  
Flow And Heat Transfer ◽  
Flow Heat

Treelike structures abound in natural as well as man-made transport systems, which have fascinated multidisciplinary researchers to study the transport phenomena and properties and understand the transport mechanisms of treelike structures for decades. The fluid flow and heat transfer in treelike networks have received an increasing attention over the past decade as the highly efficient transport processes observed in natural treelike structures can provide useful hints for optimal solutions to many engineering and industrial problems. This review paper attempts to present the background and research progress made in recent years on the transport phenomenon in treelike networks as well as technological applications of treelike structures. The subtopics included are optimization of branching structures, scaling laws of treelike networks, and transport properties for laminar flow, turbulent flow, heat conduction, and heat convection in treelike networks. Analytical expressions for the effective transport properties have been derived based on deterministic treelike networks, and the effect of branching parameters on the transport properties of treelike networks has also been discussed. Furthermore, numerical simulation results for treelike microchannel networks are presented as well. The proposed transport properties may be beneficial to understand the transport mechanisms of branching structures and promote the applications of treelike networks in engineering and industry.

Development of the Industrial Robot Electric Drive Model

2021 ◽  
Vol 64 (6) ◽  
pp. 52-57
Author(s):  
Konstantin Litsin ◽  
◽  
Sergei Baskov ◽  
Yaroslav Makarov ◽  
◽  
...  
Keyword(s):  
Electric Drive ◽  
Robot Manipulator ◽  
Block Diagram ◽  
Industrial Robot ◽  
Permanent Magnet Synchronous Motor ◽  
Industrial Robots ◽  
Full Turn ◽  
Position Controller ◽  
Power Part ◽  
The Cost

Currently, the penetration of industrial robots into all sectors of the economy is increasing. However, there is an acute problem of conducting preliminary tests. The use of the digital twin as a replacement for the industrial robot is driven by high economic costs. In order to reduce the cost of the project, a solution is proposed to conduct preliminary tests on the developed model. The article developed a mathematical model of one of the drives of the industrial robot manipulator Yaskawa Motoman MH50-35. The model is suitable for researching the movement of the robot' tool. A mathematical description of a permanent magnet synchronous motor SGMJV-09A in a rotating coordinate system is given and a block diagram of the power part of the drive is made. A system for regulating the position of the robot's tool with a nonlinear position controller has been synthesized. Based on the results of modeling the operation of an electric drive in the Matlab Simulink environment, the degree of correspondence of the developed model to a real object was assessed and conclusions were drawn about the limits of its applicability for studying the operation of an electric drive of a robotic arm. The accuracy of working out the task for turning the wrist is 0.0001 rad, there is no overshoot in position, and the time for completing a full turn of the tool is 1.07 s.

ASSESSMENT OF THE APPLICABILITY OF LARAWAN TECHNOLOGIES FOR THE ORGANIZATION OF A BACKUP COMMUNICATION CHANNEL FOR METEOROLOGICAL SUPPORT OF AIRFIELDS

2021 ◽  
pp. 25-31
Author(s):  
Д.К. Тунеголовец
Keyword(s):  
Communication Channel ◽  
Block Diagram ◽  
Essential Feature ◽  
Spatial And Temporal Variability ◽  
Weather Forecasts ◽  
Economic Problems ◽  
Present Information ◽  
The Cost ◽  
Positive Results

В настоящее время информация о состоянии атмосферы широко используется как при составлении прогнозов погоды, так и при решении многих экономических задач. Существенная особенность метеорологических явлений - их пространственно-временная изменчивость. Это вызывает необходимость такой организации наблюдений, которая позволит своевременно отметить возникновение явления и проследить за ходом его развития. Статистика показывает, что в период с 1997 по 2000 годы произошло порядка 193 авиационных инцидентoв, которые обусловлены недостатками метеорологического обеспечения полетов. Поэтому задача повышения качества метеорологического обеспечения является актуальной. На основе модельных и практических экспериментов показано, что беспроводной канал связи LoRaWaN способен объединить весь поток данных, поступающих с удаленных метеорологических датчиков, которые используют разные протоколы для взаимодействия друг с другом. В ходе выполнения эксперимента получены положительные результаты, доказывающие возможность организации таких каналов связи для задач метеообеспечения аэродромов. Также приводится структурная схема для организации канала связи. При этом не требуется прокладка кабельных коммуникаций связи, когда стоимость такого вида работ, включая согласование, зачастую значительно превышает стоимость самого метеорологического оборудования At present, information on the state of the atmosphere is widely used both in the preparation of weather forecasts and in solving many economic problems. An essential feature of meteorological phenomena is their spatial and temporal variability. This makes it necessary to organize observations in such a way that will allow timely noting the occurrence of the phenomenon and monitoring the progress of its development. Statistics show that in the period from 1997 to 2000 there were about 193 aviation incidents, which were caused by shortcomings in the meteorological support of flights. Therefore, the task of improving the quality of meteorological support is urgent. This article shows, based on model and practical experiments, that the LaRaWAN wireless communication channel is able to combine the entire data stream coming from remote meteorological sensors using various communication protocols among themselves. During the experiment, I obtained positive results, proving the possibility of organizing such communication channels for the tasks of meteorological support of airfields. A block diagram for the organization of a communication channel is also provided. At the same time, the laying of cable communications is not required, when the cost of this type of work, including coordination, often significantly exceeds the cost of the meteorological equipment itself

The Development of the Traction Drive Mechanism Made of the Plastic Magnet

2003 ◽  
Author(s):  
Akira Shoji ◽  
Giichi Kawashima
Keyword(s):  
Magnetic Induction ◽  
Ferrite Powder ◽  
Traction Drive ◽  
Drive Mechanism ◽  
Hard Magnet ◽  
The One ◽  
The Cost ◽  
Outside Diameter ◽  
As If

This paper is the one that it was described to have developed the traction drive by using the plastic hard magnet. The plastics material was used to research by the following reasons. The plastics material can mold it. As a result, it processes complex and it is possible to make it to the magnet. In addition, it is possible to mass-produce, it is light, and it is also possible that the miniaturization reduces possible and the cost. Next, the mechanism of the traction drive is described. It rotates by being circumscribed by non-contact, and inscribing two plastic hard rings as if the gear. N pole and S pole are divided equally in the direction of the circumference of the ring. It becomes by these as if the match of the god with teeth and teeth. These devices are commonly called “Gear without teeth”. Some doughnut disks with a different outside diameter were produced. Each disk is made magnetism. Each disk was set, and assembled to one disk. The disk is molded with the plastic hard. The plastics material used the one that the ferrite powder was mixed with the polyacetal resin. Making to magnetism is possible by the magnetization technology. The mechanism, molding, making to magnetism, and the magnetic induction, etc. were examined in the experiment. The development of non-contact made of plastic hard traction drive device was proven to be possible by this research.

scholarly journals O paradigma científico no discurso da mídia brasileira sobre Zika e microcefalia

2018 ◽  
Vol 2 (1) ◽  
pp. 9
Author(s):  
Juliane Lopes Ferreira dos Santos ◽  
Denise Silva Matias ◽  
Nauana Nascimento Novais
Keyword(s):  
Control Measures ◽  
Scientific Paradigm ◽  
Scientific Debate ◽  
The Public ◽  
Emergency Situations ◽  
Biological Causation ◽  
The Media ◽  
The Subject ◽  
Official Sources ◽  
The Relationship

Introduction: In 2015 Brazil was surprised by an increase in the incidence of microcephaly, related by the Ministry of Health to Zika virus infection during pregnancy. This theme, which was notorious for public health, reached wide popular repercussion through the media. Objectives: To describe the presence of the scientific paradigm in the discourse of health professionals, researchers or journalists who inform the lay public about biological causation. Methodology: All the news made available on the digital platform of the Folha de São Paulo newspaper, containing the key term "Zika and microcephalia" and published between November 11, 2015 and March 4, 2016, was performed. Scientific elucidation on the subject. The news items were classified as to the presence of certainty or uncertainty about the relationship between Zika and microcephaly in their content and the central idea in the subject titles. Results: Of the 387 reports analyzed, 51.4% related Zika as a causal factor of microcephaly, while 32.8% considered the presence of uncertainty in the relationship. It was verified that the newspaper privileged subjects related to the repercussions due to the diseases, being predominant the report of control measures. Considering the origin of the news, it was significant the use of official sources, presented in 82% of the news. Conclusion: The scientific paradigm was disregarded, ignoring the uncertainty principle and the scientific debate. The limitations of both journalists and health managers were also demonstrated in the elaboration of an effective communication with the public in emergency situations.

scholarly journals AUTOMATED SYSTEM OF PREVENTION OF EMERGENCY SITUATIONS IN A SLIDING SUPPORT OF A GAS PUMPING UNIT

2021 ◽  
pp. 67-69
Author(s):  
M. P. Kukhtik ◽  
A. I. Repnikov ◽  
Yu. P. Serdobintsev ◽  
M. A. Khaustov
Keyword(s):  
Block Diagram ◽  
Control Program ◽  
Automated System ◽  
Control Panel ◽  
Emergency Situations ◽  
Pumping Unit ◽  
Gas Pumping ◽  
Gas Pumping Unit ◽  
Operator Control

Block diagram and operation principle for automated system of prevention of emergency situations in a sliding support of a gas pumping unit have been developed. Control program has been written and HMI-interface of operator control panel has been developed.

scholarly journals Transformation of Value Positions in the Youth Attitude of to Work: A Philosophical Analysis

2019 ◽  
pp. 35-40
Author(s):  
Roman Kobylkin
Keyword(s):  
Mass Culture ◽  
Theoretical Basis ◽  
Practical Importance ◽  
Value Orientations ◽  
Information Revolution ◽  
Research Papers ◽  
Cultural Changes ◽  
Internet Radio ◽  
The Media ◽  
New Forms Of Work

Most representatives of the modern youth demonstrate formed clip thinking characterized by a loss of skills to analyze, discourse, set logical connections. This not only affects the process of learning and obtaining professional knowledge, but also expresses a change in the attitude to work as one of the most important values against the background of a significant increase in the value of leisure. The transformation of values due to the influence of external factors such as television, Internet, radio, media on consciousness is obvious. The bulk of the media clip thinking is the youth facing serious difficulties in introducing serious creative work and the creation of new values. At present the structure and types of differences in employment are undergoing epoch-making changes. They are expressed in the mixture of traditional and modern trends, the emergence of new forms of work (freelance, downshifting, etc.), as well as in the formation of new trends in the attitude to work. New values such as "success", "pleasure", "power" are formed on the basis of cultural changes in the youth environment. The value paradigm formed in the youth environment under the influence of mass culture in the conditions of the information revolution has become an expression of new needs in the transformation of social reality. Under these conditions, the study of trends in the youth's value attitudes to work is of great theoretical and practical importance. The theoretical basis of this article is grounded on the works of A. Mole, E. Toffler, D. bell, E. Fromm, G. Marcuse, G. McLuhan. Their research papers reflect the changes that began to occur in society in the second half of the XX century and had an impact on the change of value orientations of young people. In our country, these changes were manifested in the generation of the nineties and noughties, and the representatives of this generation are the carriers of new values associated with the consequences of the information revolution.

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