Diagnostic model for thermal control of rolling stock wheels

The paper is devoted to experimental investigation of contactless thermal control of tread brakes. It presents the results of numerical modeling of thermal condition of freight car solid wheel in various modes of braking and thermal control on the basis of developed complex computer model. The authors show the comparison of gained results with experimental data. They have carried out the statistical analysis and revealed the most common forms of signals. As a result, the paper considers the perspectives of the further development of the discussed statements.

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Mathematical Modeling of Heating and Thermal Control Processes of Railway Rolling Stock Units

Transportation Research Procedia ◽

10.1016/j.trpro.2021.02.102 ◽

2021 ◽

Vol 54 ◽

pp. 513-521

Author(s):

Alexander Mironov ◽

Alexander Pavlyukov ◽

Dmitry Saltykov ◽

Pavel Shalupina

Keyword(s):

Mathematical Modeling ◽

Thermal Control ◽

Rolling Stock ◽

Control Processes ◽

Railway Rolling Stock

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THERMAL CONTROL INVESTIGATION OF ROLLING-STOCK SHOE BRAKES BY SIMULATION METHOD

Bulletin of Bryansk state technical university ◽

10.30987/1999-8775-2020-4-31-42 ◽

2020 ◽

Vol 2020 (4) ◽

pp. 31-42

Author(s):

Pavel Shalupin

Keyword(s):

Thermal Loading ◽

Time Moment ◽

Thermal Control ◽

Simulation Method ◽

Control Area ◽

Rolling Stock ◽

Maximum Temperature ◽

Wheel Pair ◽

Brake Application ◽

Thermal Diagnostics

The development of heavy speed freight train communications in the Russian Federation results in the increased thermal loading of braking system elements of rolling-stock, in particular, in shoe brakes. Taking into account the requirements of branch program documents on wheel life increase, it is evident that the further development of freight communications requires a complex application of thermal diagnostics means for auto-brake equipment of rolling-stock during a train motion. The statistics shows that the fifth part of wheel pair failures is connected with thermal-mechanical damages and the situation goes on to be aggravated. In view of this hardware and software means for thermal diagnostics of shoe brakes require further improvement. The purpose of this paper is the process investigation of shoe brake thermal control by method of computer simulation and the estimate of infrared optics position impact upon control results. There is considered a model for the definition of a scanning path and computation of a signal level being part of a complex simulation model of wheel thermal control. The model offered is based on the methods of solid dynamics system investigations in the basis of which there is an application of theorems on mass center motion and changes of a solid kinetic moment. The model is used for finding a form and a spot area at every time moment of scanning by a solution of a problem on a dynamic spatial intersection of a wheel surface with the control area. There are considered different versions of optics orientation to an object of control for each of which for the first time there are obtained calculated thermal signals from the object under control. The analysis has shown that at the optics orientation to wheels from the outside a wheel tread appears to be in the control area that allows defining a maximum temperature of a wheel. But at the realization of emergency brake application a sharp short-time temperature increase of a tread is possible which indicates an improper operation of a brake unit. The optics orientation to a wheel from its inner side allows excluding false alarm indices at emergency brake application. The correctness of the results shown in the paper is confirmed by convergence with the results of wheel heating monitoring and environmental tests of experimental complexes of thermal control means of shoe brakes.

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Scanning-probe microscope analysis of optical thin films: A new analytical tool in a manufacturing environment

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100173078 ◽

1994 ◽

Vol 52 ◽

pp. 1068-1069

Author(s):

S. P. Sapers ◽

R. Clark ◽

P. Somerville

Keyword(s):

Thin Film ◽

Thin Films ◽

Thermal Control ◽

Scanning Probe Microscope ◽

Scanning Probe ◽

List Type ◽

Manufacturing Environment ◽

Physical Measurements ◽

Probe Microscope

OCLI is a leading manufacturer of thin films for optical and thermal control applications. The determination of thin film and substrate topography can be a powerful way to obtain information for deposition process design and control, and about the final thin film device properties. At OCLI we use a scanning probe microscope (SPM) in the analytical lab to obtain qualitative and quantitative data about thin film and substrate surfaces for applications in production and research and development. This manufacturing environment requires a rapid response, and a large degree of flexibility, which poses special challenges for this emerging technology. The types of information the SPM provides can be broken into three categories:(1)Imaging of surface topography for visualization purposes, especially for samples that are not SEM compatible due to size or material constraints;(2)Examination of sample surface features to make physical measurements such as surface roughness, lateral feature spacing, grain size, and surface area;(3)Determination of physical properties such as surface compliance, i.e. “hardness”, surface frictional forces, surface electrical properties.

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Steel in Rolling Stock

Scientific American ◽

10.1038/scientificamerican03041893-14312bsupp ◽

1893 ◽

Vol 35 (896supp) ◽

pp. 14312-14313

Keyword(s):

Rolling Stock

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Rolling Stock of Japanese Railways

Scientific American ◽

10.1038/scientificamerican08121911-107csupp ◽

1911 ◽

Vol 72 (1858supp) ◽

pp. 107-107

Keyword(s):

Rolling Stock

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Simulation Research about the Number of Lines in Passenger Rolling Stock Servicing Yard on Arena

Plan, Build, and Manage Transportation Infrastructure in China ◽

10.1061/40952(317)58 ◽

2008 ◽

Cited By ~ 1

Author(s):

Lixin Zhou ◽

Xiongbin Yang

Keyword(s):

Rolling Stock ◽

Simulation Research

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THE METHODS OF DEVELOPING COMPUTATIONAL THINKING OF STUDENTS WHILE STUDYING THE COURSE "NUMERICAL METHODS" BASED ON BLENDED LEARNING

Informatics and Education ◽

10.32517/0234-0453-2019-34-6-34-41 ◽

2019 ◽

pp. 34-41

Author(s):

M. M. Klunnikova

Keyword(s):

Numerical Methods ◽

Blended Learning ◽

Computational Thinking ◽

Individual Characteristics ◽

Diagnostic Model ◽

Mathematics Students ◽

Professional Activities ◽

Cognitive Component ◽

Professional Field ◽

The Individual

The work is devoted to the consideration of improving the quality of teaching students the discipline “Numerical methods” through the development of the cognitive component of computational thinking based on blended learning. The article presents a methodology for the formation of computational thinking of mathematics students, based on the visualization of algorithmic design schemes and the activation of the cognitive independence of students. The characteristic of computational thinking is given, the content and structure of computational thinking are shown. It is argued that a student with such a mind is able to manifest himself in his professional field in the best possible way. The results of the application of the technique are described. To determine the level of development of the cognitive component of computational thinking, a diagnostic model has been developed based on measuring the content, operational and motivational components. It is shown that the proposed method of developing computational thinking of students, taking into account the individual characteristics of students’ thinking, meaningfully based on the theoretical and practical aspects of studying the discipline, increases the effectiveness of learning the course “Numerical methods”. The materials of the article are of practical value for teachers of mathematical disciplines who use information and telecommunication technologies in their professional activities.

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