scholarly journals Preliminary layout of the main technological equipment of a self-propelled machine with a rod mechanism for installing and fixing the end tower for a mobile ropeway

2021 ◽  
Vol 7 (4) ◽  
pp. 336-347
Author(s):  
A.V. Lagerev ◽  
◽  
I.A. Lagerev ◽  
Keyword(s):  
Carrying Capacity ◽  
General Purpose ◽  
Transport Equipment ◽  
Cable System ◽  
Structural Dimensions ◽  
Rotary Platform ◽  
Cross Country ◽  
Technological Means ◽  
Rapid Deployment ◽  
Promising Type

Mobile ropeways for carrying out transport operations, formed with the help of terminal transport units connected by a single cable system on the basis of self-propelled wheeled or tracked chassis of increased carrying capacity and cross-country ability, are a promising type of lifting and transport equipment that ensures the rapid deployment of the necessary technological means. The article discusses the issues of preliminary arrangement of the rod mechanism for installation and fixation in the working position of the end tower using a folding rod consisting of two articulated links for a constructive variant of the outrigger placement of the tower on a rotary platform. The design and principle of operation of the rod mechanism is considered. A mathematical model has been developed that provides the required normative vertical dimension of a self-propelled vehicle for the purpose of its safe independent movement to the deployment site on general-purpose highways. The analysis of the influence of normative dimensional requirements, the structural dimensions of the bearing frame of the chassis and the height of the end tower on the main structural dimensions of the articulated folding rod in the transport position is carried out.

scholarly journals Providing the vertical dimension of a self-propelled machine with a rod mechanism for install-ing and fixing the end tower for a mobile ropeway

2021 ◽  
Vol 7 (2) ◽  
pp. 141-152
Author(s):  
A.V. Lagerev ◽  
◽  
V.I. Tarichko ◽  
I.A. Lagerev ◽  
◽  
...  
Keyword(s):  
Carrying Capacity ◽  
Base Station ◽  
Vertical Dimension ◽  
Base Stations ◽  
Transport Equipment ◽  
Technological Tools ◽  
Loading And Unloading ◽  
Cross Country ◽  
Rope System ◽  
Promising Type

Mobile ropeways for carrying out loading and unloading and transport and transfer operations in previously unsettled or inaccessible areas, formed with the help of terminal base stations connected by a single rope system on the basis of self-propelled wheeled or tracked chassis of increased carrying capacity and cross-country ability, are a promising type of lifting and transport equipment ensuring the prompt deployment of the necessary technological tools. The article deals with the layout of the mechanism for installing and fixing the end tower using a folding bar, consisting of two articulated links. A mathematical model has been developed that provides the required normative vertical dimension of a self-propelled base station of a mobile ropeway with the aim of its safe independent movement to the place of deployment of the ropeway along general roads. The analysis of the influence of standard dimensional requirements, design dimensions of the chassis carrying frame and the height of the end tower on the main design dimensions of the articulated folding rod in the transport position is carried out. Calculations have shown that the considered design makes it possible to provide the standard vertical dimension of a base station on a 6-axle self-propelled chassis with an end tower length of up to 18 m.

scholarly journals An Equivalent Circuit for the Evaluation of Cross-Country Fault Currents in Medium Voltage (MV) Distribution Networks

Energies ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1929 ◽  
Author(s):  
Fabio Gatta ◽  
Alberto Geri ◽  
Stefano Lauria ◽  
Marco Maccioni
Keyword(s):  
Distribution Networks ◽  
General Purpose ◽  
Simultaneous Occurrence ◽  
Medium Voltage ◽  
Electromagnetic Transient ◽  
High Impedance ◽  
Fault Currents ◽  
Cross Country ◽  
Return Path

A Cross-Country Fault (CCF) is the simultaneous occurrence of a couple of Line-to-Ground Faults (LGFs), affecting different phases of same feeder or of two distinct ones, at different fault locations. CCFs are not uncommon in medium voltage (MV) public distribution networks operated with ungrounded or high-impedance neutral: despite the relatively small value of LGF current that is typical of such networks, CCF currents can be comparable to those that are found in Phase-To-Phase Faults, if the affected feeder(s) consists of cables. This occurs because the faulted cables’ sheaths/screens provide a continuous, relatively low-impedance metallic return path to the fault currents. An accurate evaluation is in order, since the resulting current magnitudes can overheat sheaths/screens, endangering cable joints and other plastic sheaths. Such evaluation, however, requires the modeling of the whole MV network in the phase domain, simulating cable screens and their connections to the primary and secondary substation earth electrodes by suitable computer programs, such as ATP (which is the acronym for alternative transient program) or EMTP (the acronym for electromagnetic transient program), with substantial input data being involved. This paper presents a simplified yet accurate circuit model of the faulted MV network, taking into account the CCF currents’ return path (cable sheaths/screens, ground conductors, and earthing resistances of secondary substations). The proposed CCF model can be implemented in a general-purpose simulation program, and it yields accurate fault currents estimates: for a 20 kV network case study, the comparison with accurate ATP simulations evidences mismatches mostly smaller than 2%, and never exceeding 5%.

scholarly journals Making the Body Electric: The Politics of Body-Worn Cameras and Facial Recognition in the United States

2020 ◽  
Vol 18 (2) ◽  
pp. 157-169 ◽  
Author(s):  
Jacob Hood
Keyword(s):  
United States ◽  
Cultural Practices ◽  
Facial Recognition ◽  
The United States ◽  
Critical Discussion ◽  
The Body ◽  
High Profile ◽  
Marginalized Groups ◽  
Technological Means ◽  
Rapid Deployment

This paper explores the rapid deployment of police body-worn cameras (BWCs) and the subsequent push for the integration of biometric technologies (i.e., facial recognition) into these devices. To understand the political dangers of these technologies, I outline the concept of “making the body electric” to provide a critical language for cultural practices of identifying, augmenting, and fixing the body through technological means. Further, I argue how these practices reinforce normative understandings of the body and its political functionality, specifically with BWCs and facial recognition. I then analyze the rise of BWCs in a cultural moment of high-profile police violence against unarmed people of color in the United States. In addition to examining the ethics of BWCs, I examine the politics of facial recognition and the dangers that this form of biometric surveillance pose for marginalized groups, arguing against the interface of these two technologies. The pairing of BWCs with facial recognition presents a number of sociopolitical dangers that reinforce the privilege of perspective granted to police in visual understandings of law enforcement activity. It is the goal of this paper to advance critical discussion of BWCs and biometric surveillance as mechanisms for leveraging political power and racial marginalization.

scholarly journals Results of scientific research of Bryansk State University in the sphere of mobile transportation and handling rope systems and ropeways

2021 ◽  
Vol 7 (1) ◽  
pp. 9-29
Author(s):  
T.A. Stepchenko ◽  
◽  
O.V. Babich ◽  
Keyword(s):  
Computer Simulation ◽  
Carrying Capacity ◽  
Scientific Research ◽  
State University ◽  
Work Processes ◽  
Research Activities ◽  
Cross Country ◽  
The Creation ◽  
Technical Solutions

The results of scientific research activities of scientists of the Academician I.G. Petrovskii Bryansk State University in the development of promising domestic samples of designs of mobile transport and reloading rope systems and ropeways based on self-propelled wheeled chassis of high carrying capacity and cross-country ability and the creation of scientifically substantiated methods for their design and computer simulation of work processes during operation. The description and analysis of the effectiveness of new technical solutions of mobile passenger and cargo aerial ropeways are given.

I. Experiments in the Spacelab project - Spacelab and material processing facilities and experiments

1978 ◽  
Vol 361 (1705) ◽  
pp. 131-142 ◽  
Keyword(s):  
Material Processing ◽  
Carrying Capacity ◽  
Materials Science ◽  
Environmental Control ◽  
Electrical Power ◽  
General Purpose ◽  
Load Carrying Capacity ◽  
Load Carrying ◽  
The Cost ◽  
Power And Energy

The paper is introduced by a summary of the services available to the Spacelab user. Typical Shuttle- Spacelab flight profiles and Spacelab configurations are mentioned. The load carrying capacity and the capability and characteristics of the main subsystems, like electrical power and energy, environmental control as well as data management, are briefly described. The special constraints for the experiments to be flown on the first Spacelab payload will be discussed and the general purpose facilities (like furnaces and process chambers) to be used for carrying out the materials science experiments are described briefly. The cost aspects for performing experiments on Spacelab missions after the first mission are discussed.

scholarly journals Heat Dissipation in Variable Underground Power Cable Beddings: Experiences from a Real Scale Field Experiment

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 7189
Author(s):  
Christoph Verschaffel-Drefke ◽  
Markus Schedel ◽  
Constantin Balzer ◽  
Volker Hinrichsen ◽  
Ingo Sass
Keyword(s):  
Thermal Properties ◽  
Field Experiment ◽  
Carrying Capacity ◽  
Heat Dissipation ◽  
Power Cable ◽  
Cable System ◽  
Drying And Rewetting ◽  
Underground Power Cable ◽  
Bedding Materials ◽  
Real Scale

To prevent accelerated thermal aging or insulation faults in cable systems due to overheating, the current carrying capacity is usually limited by specific conductor temperatures. As the heat produced during the operation of underground cables has to be dissipated to the environment, the actual current carrying capacity of a power cable system is primarily dependent on the thermal properties of the surrounding porous bedding material and soil. To investigate the heat dissipation processes around buried power cables of real scale and with realistic electric loading, a field experiment consisting of a main field with various cable configurations, laid in four different bedding materials, and a side field with additional cable trenches for thermally enhanced bedding materials and protection pipe systems was planned and constructed. The experimental results present the strong influences of the different bedding materials on the maximum cable ampacity. Alongside the importance of the basic thermal properties, the influence of the bedding’s hydraulic properties, especially on the drying and rewetting effects, were observed. Furthermore, an increase in ampacity between 25% and 35% was determined for a cable system in a duct filled with an artificial grouting material compared to a common air-filled ducted system.

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