scholarly journals A simulation model of a traction network taking into account the variable resistance of the contact line and a given power profile of the electric vehicle in MatLAB Simulink

2021 ◽  
Vol 2061 (1) ◽  
pp. 012042
Author(s):  
E A Spiridonov ◽  
M A Mayboroda
Keyword(s):  
Initial Data ◽  
Simulation Model ◽  
Contact Line ◽  
Building Blocks ◽  
Rail Transport ◽  
Electric Transport ◽  
Transport Networks ◽  
Traction Network ◽  
Power Profile ◽  
Vehicle Motion

Abstract The article describes an approach to the development of a simulation model of an electric transport traction network, taking into account the change in the resistance of the contact wire when the vehicle is moving. The advantage of the model is that it is executed using the building blocks of Simulink, visually reflects the topology of the traction network, and can be used for modeling both trolleybus and rail transport networks. As the initial data for the model, both standardized drive cycles and experimentally obtained modes of vehicle motion can be used.

Numerical Simulation of Digital Microfluidics Based on Electro-Dynamic Model

2012 ◽  
Vol 2 (3) ◽  
pp. 14-23
Author(s):  
Liguo Chen ◽  
Mingxiang Ling ◽  
Deli Liu
Keyword(s):  
Numerical Simulation ◽  
Simulation Model ◽  
Contact Line ◽  
Contact Area ◽  
Digital Microfluidics ◽  
Phase Contact ◽  
Electrowetting On Dielectric ◽  
Three Phase ◽  
Internal Mechanism ◽  
Contact Domain

Aiming at the doubt and divarication about the internal mechanism of electrowetting on dielectric (EWOD) in digital microfluidics, the authors attempted to explain the internal mechanism of EWOD through electro-dynamic-based numerical simulation model. First, the boundary conditions for the governing equation were found. Then the influence of mesh number on simulation results was analyzed and feasibility of the simulation model was verified by comparing numerical results with theoretical ratiocination. Finally, they compared the electro-dynamic actuation force acting on the surface of droplet on three digital microfluidic structures, which have the same three-phase contact line but different area of contact domain. Analytical results showed that electro-dynamic force generated solely by the accumulation of induced charges in contact domain was three times larger than that generated by three-phase contact line. Induced charges accumulated on both three-phase contact line and contact area of droplet gave the contribution to EWOD, but contact area played a major role in the change of contact angle of droplet.

scholarly journals An Efficient Index for Reachability Queries in Public Transport Networks

2020 ◽  
pp. 34-48
Author(s):  
Bezaye Tesfaye ◽  
Nikolaus Augsten ◽  
Mateusz Pawlik ◽  
Michael H. Böhlen ◽  
Christian S. Jensen
Keyword(s):  
Public Transport ◽  
Efficient Solution ◽  
Building Blocks ◽  
Transport Networks ◽  
Start Time ◽  
Network Cell ◽  
Reachability Query ◽  
Reachability Queries ◽  
Index 2 ◽  
Path Queries

AbstractComputing path queries such as the shortest path in public transport networks is challenging because the path costs between nodes change over time. A reachability query from a node at a given start time on such a network retrieves all points of interest (POIs) that are reachable within a given cost budget. Reachability queries are essential building blocks in many applications, for example, group recommendations, ranking spatial queries, or geomarketing. We propose an efficient solution for reachability queries in public transport networks. Currently, there are two options to solve reachability queries. (1) Execute a modified version of Dijkstra’s algorithm that supports time-dependent edge traversal costs; this solution is slow since it must expand edge by edge and does not use an index. (2) Issue a separate path query for each single POI, i.e., a single reachability query requires answering many path queries. None of these solutions scales to large networks with many POIs. We propose a novel and lightweight reachability index. The key idea is to partition the network into cells. Then, in contrast to other approaches, we expand the network cell by cell. Empirical evaluations on synthetic and real-world networks confirm the efficiency and the effectiveness of our index-based reachability query solution.

Growth and Characterization of HTSc Nanowires and Nanoribbons

2017 ◽  
Author(s):  
M.R. Koblischka
Keyword(s):  
High Temperature ◽  
High Temperature Superconductors ◽  
Building Blocks ◽  
Film Material ◽  
Electric Transport ◽  
Superconducting Nanowires ◽  
Superconducting Cuprates ◽  
High Temperature Superconducting ◽  
Transport Measurements

This article describes the fabrication of high-temperature superconducting nanowires and their characterization by magnetic and electric transport measurements. In the literature, nanowires of high-temperature superconductors (HTSc) are obtained by means of lithography, using thin film material as a base. However, there are two main problems with this approach: first, the substrate often influences the HTSc nanowire, and second, only electric transport measurements can be performed. This article explains how nanowires and nanobelts of high-temperature superconducting cuprates can be prepared by the template method and by electrospinning. It also considers the possibilities for employing substrate-free HTSc nanowires as building blocks to realize new, nanoporous bulk superconducting materials for a variety of applications.

Independent electrical power supply of river bridges and objects adjacent to them

2019 ◽  
pp. 545-550
Author(s):  
Konstantin Kim ◽  
Mikhail Gerasimov ◽  
Aleksandr Smirnov
Keyword(s):  
Traffic Safety ◽  
Power Supply ◽  
Electrical Power ◽  
Practical Importance ◽  
Electric Energy ◽  
Cost Effective ◽  
Electric Transport ◽  
Hydroelectric Power ◽  
Power Stations ◽  
Traction Network

Objective: To improve traffic safety, reduce the environmental impact and to save electricity by using the energy of river flows to supply river bridges with power. Methods: A renewable and quite cost- effective source of electric energy can be obtained by using small hydroelectric power stations (GES). A project on installation of small submersible GES on the bridge footings over the Neva River in Saint Petersburg is described in the given article. Results: The powers of hydraulic turbines for each bridge were calculated based on their energy consumption and the number of possible turbine installation places. Practical importance: It is supposed to give generated electric power to the traction network of electric transport or to accumulate it in storages providing power supply of a nearby infrastructure at any time. In addition, strengthening of the present distribution network within the city by means of the additional sources of electricity will be provided.

Key building blocks for high-capacity WDM photonic transport networks

1998 ◽  
Vol 16 (7) ◽  
pp. 1286-1297 ◽  
Author(s):  
A. Jourdan ◽  
F. Bakhti ◽  
L. Berthelon ◽  
F. Bruyere ◽  
M.W. Chbat ◽  
...  
Keyword(s):  
High Capacity ◽  
Building Blocks ◽  
Transport Networks

scholarly journals Speeding Up Reachability Queries in Public Transport Networks Using Graph Partitioning

2021 ◽  
Author(s):  
Bezaye Tesfaye ◽  
Nikolaus Augsten ◽  
Mateusz Pawlik ◽  
Michael H. Böhlen ◽  
Christian S. Jensen
Keyword(s):  
Public Transport ◽  
Building Blocks ◽  
Transport Networks ◽  
Start Time ◽  
Network Cell ◽  
Points Of Interest ◽  
Reachability Query ◽  
Reachability Queries ◽  
Index 2 ◽  
Path Queries

AbstractComputing path queries such as the shortest path in public transport networks is challenging because the path costs between nodes change over time. A reachability query from a node at a given start time on such a network retrieves all points of interest (POIs) that are reachable within a given cost budget. Reachability queries are essential building blocks in many applications, for example, group recommendations, ranking spatial queries, or geomarketing. We propose an efficient solution for reachability queries in public transport networks. Currently, there are two options to solve reachability queries. (1) Execute a modified version of Dijkstra’s algorithm that supports time-dependent edge traversal costs; this solution is slow since it must expand edge by edge and does not use an index. (2) Issue a separate path query for each single POI, i.e., a single reachability query requires answering many path queries. None of these solutions scales to large networks with many POIs. We propose a novel and lightweight reachability index. The key idea is to partition the network into cells. Then, in contrast to other approaches, we expand the network cell by cell. Empirical evaluations on synthetic and real-world networks confirm the efficiency and the effectiveness of our index-based reachability query solution.

scholarly journals One of the approaches to modeling the process of insect development to improve the effectiveness of protective measures of fruit crops

2021 ◽  
pp. 31-36
Author(s):  
E. P. Rybalkin ◽  
V. A. Shishkin ◽  
V. N. Opanasenko
Keyword(s):  
Mathematical Model ◽  
Initial Data ◽  
Simulation Model ◽  
Development Process ◽  
Insect Development ◽  
Fruit Crops ◽  
Protective Measures ◽  
Software Simulation ◽  
Development Phases ◽  
Increase Efficiency

Protection of fruit crops from pests is one of the most important tasks of gardening. In turn, the use of protective measures has both positive and negative sides, which makes the issue of improving their effectiveness one of the main ones. Having data on the estimated number of pests and the dates of the beginning of their development phases, it is possible to increase efficiency by choosing the optimal exposure measure and drawing up a more accurate schedule of protective measures. One way to determine such parameters is to use simulation. The article presents one of the approaches to constructing a mathematical model of the insect development process, which is used to build a software simulation model that allows to increase the effectiveness of protective measures of fruit crops. The article describes what is the essence of the modeled process. A mathematical model and methods for determining its parameters are presented. The required initial data for modeling are defined.

scholarly journals PRT simulation research

2013 ◽  
Vol 27-28 (3-4) ◽  
pp. 95-102 ◽  
Author(s):  
Maciej Kozłowski ◽  
Włodzimierz Choromański
Keyword(s):  
Simulation Model ◽  
Commercial Vehicle ◽  
Correct Description ◽  
Simulation Research ◽  
Physical Motion ◽  
Straight Line ◽  
Railway System ◽  
Turning Mechanism ◽  
Vehicle Motion ◽  
Curved Track

The paper presents analyses results of PRT vehicle driveability in a ¼ scale conducted with the application of a simulation model for a straight line driving conditions and when driving on a curve. The results of the present work will be used in the analysis of a physical motion model in a laboratory stand reflecting a railway system of the stand. The paper discusses the first stage of research in the process of virtual pre-prototyping which is to be finalized with the construction of a non-commercial vehicle prototype. In the construction of the simulation model, particular attention has been paid to three issues. First of all, a correct description of design features connected with the lack of so called centring mechanism – and not profiled tyred wheels independently embedded in the axes of the set. Secondly, a proper description of a turning mechanism with the use of a leading rollers system alongside the rail edge. Thirdly, the use of linear motor for the vehicle drive. The simulation model has been developed within MBS environment. For the description of tyred wheels, the library of TNO Delft Tyre has been used. Vehicle motion stability has been tested on the straight and curved track sections. The research has been financed within the framework of ECO mobility project.

scholarly journals Logistics of Trainsets Creation with the Use of Simulation Models

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Michal Sedláček ◽  
Hynek Pavelka
Keyword(s):  
Czech Republic ◽  
Simulation Model ◽  
Computer Simulations ◽  
Simulation Models ◽  
Rail Transport ◽  
Experimental Modeling ◽  
Design Solution ◽  
The Czech Republic ◽  
Operational Process ◽  
Operational Processes

Abstract This paper focuses on rail transport in following the train formation operational processes problem using computer simulations. The problem has been solved using SIMUL8 and applied to specific train formation station in the Czech Republic. The paper describes a proposal simulation model of the train formation work. Experimental modeling with an assessment of achievements and design solution for optimizing of the train formation operational process is also presented.

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