A stand for researching the dynamics and strength of a freight wagons bogie

2021 ◽  
Vol 2 (3) ◽  
pp. 327-338
Author(s):  
O. D. Pokrovskaya
Keyword(s):  
Systems Engineering ◽  
Laboratory Work ◽  
Rolling Stock ◽  
Main Trend ◽  
Highly Qualified ◽  
Laboratory Equipment ◽  
Current State ◽  
Engineering Modeling ◽  
New Generation ◽  
Freight Wagons

The purpose of the study is to characterize the laboratory equipment of a new generation that meets the requirements that are imposed today on the training of specialists in the rolling stock of railways. Analytical, diagnostic and didactic methods, theory and methodology of design and mechanics of freight wagon, theory of complex systems, systems engineering, modeling, as well as methodological tools for organizing experiments were used. The scientific novelty is the constructive and technological scheme of a specialized laboratory stand; a didactic set of materials for organizing laboratory work using this stand.It has been established that the introduction of a new rolling stock with an increased carrying capacity is the main trend of modern car building and should be accompanied by appropriate training of highly qualified specialists capable of further development of new generation freight wagons. It is noted that conducting educational and research sessions involves studying not only the problems of strength, but also acquiring skills in working with digital technologies for collecting and transmitting data. A detailed description is given of a specialized stand developed at the Department of "Wagons and Carriage Facilities" of PGUPS for studying the properties of dynamics and strength of freight wagons of the laboratory stand. In particular, the device of the base trolley model 18-9855 is shown, the technology of the stand operation is described, illustrative materials are given on the structure and principle of operation of the projected stand. For practical laboratory exercises, a typical version of laboratory work with the use of this stand is proposed. It is shown that the involvement of students in the implementation of practical experiments and applied bench research increases interest in the future profession and allows the formation of strong skills in practical diagnostics of the current state of a freight wagon.

scholarly journals ANALYSIS OF ENSURING THE SAFETY OF FREIGHT WAGON IN MODERN CONDITIONS OF OPERATION

2021 ◽  
Vol 1 (37) ◽  
pp. 59-67
Author(s):  
D. Voloshyn
Keyword(s):  
Production Systems ◽  
Rolling Stock ◽  
Conservation Strategies ◽  
General Management ◽  
Current State ◽  
Effective System ◽  
Transport Safety ◽  
The Impact ◽  
Freight Wagons

The current state of the freight wagon fleet is characterized by increased physical wear over time. Disproportionate renewal of rolling stock, low quality of repair due to the lack of appropriate modernization of production systems, the peculiarities of loading and unloading operations in operation make increased demands on the preservation of the wagon fleet. The issues of general management of the transport safety system deserve special attention. Control of safety of freight wagons should be carried out at all stages of operation: at freight works, at transfer in the international and domestic communication, at maintenance and repair. In this case, each stage requires the use of appropriate regulations, which ensures compliance with the conditions of storage of freight wagons in operation. The presented article analyzes the current state of the freight wagon fleet with a view to ensuring their safety during operation. The factors that are the most influential in terms of effective management of the wagon fleet are identified. Possible conservation strategies are considered. The statistical material on failures and damages of wagons is resulted. Based on this, an assessment of the most significant events in terms of the impact on ensuring the safety of wagons was made. Practical solutions for creating an effective system for preserving rolling stock in transport are proposed.

Analysis and Design of 3.3 kV IGBT Based Three-Level DC/DC Converter with High-Frequency Isolation and Current Doubler Rectifier

2009 ◽  
Vol 25 (25) ◽  
pp. 103-108
Author(s):  
Dmitri Vinnikov ◽  
Tanel Jalakas ◽  
Indrek Roasto
Keyword(s):  
High Voltage ◽  
High Frequency ◽  
Power Converter ◽  
Rolling Stock ◽  
Analysis And Design ◽  
Auxiliary Power ◽  
Igbt Modules ◽  
Isolation Transformer ◽  
New Generation ◽  
Generation Power

Analysis and Design of 3.3 kV IGBT Based Three-Level DC/DC Converter with High-Frequency Isolation and Current Doubler RectifierThe paper presents the findings of a R&D project connected to the development of auxiliary power supply (APS) for the high-voltage DC-fed rolling stock applications. The aim was to design a new-generation power converter utilizing high-voltage IGBT modules, which can outpace the predecessors in terms of power density, i.e. to provide more power for smaller volumetric space. The topology proposed is 3.3 kV IGBT-based three-level neutral point clamped (NPC) half-bridge with high-frequency isolation transformer and current doubler rectifier that fulfils all the targets imposed by the designers. Despite an increased component count the proposed converter is very simple in design and operation. The paper provides an overview of the design with several recommendations and guidelines. Moreover, the simulation and experimental results are discussed and the performance evaluation of the proposed converter is presented.

Identifying Enablers and Barriers to Successful Platform-Based Product Development: A Case Study From Business-to-Business Products

2011 ◽  
Author(s):  
Jens Jorgensen ◽  
David Havens ◽  
Paul Salvatore ◽  
Alvaro J. Rojas Arciniegas ◽  
Marcos Esterman
Keyword(s):  
Product Development ◽  
Systems Engineering ◽  
Organizational Structures ◽  
Business Environment ◽  
Current State ◽  
Development Teams ◽  
Phase Gate ◽  
Different Cultures ◽  
Business To Business

Product development teams are facing continued pressure to develop more products in less time and with fewer resources. Platform-based developed is commonly seen as a solution to increase capacity of the product development pipeline. This research identified enablers and barriers to successful platform-based product development. This was achieved through a comprehensive literature review of the current state of the art and an exploratory case study of product development practices within a business-to-business environment from companies with significantly different cultures and experiences with platform-based product development. Key enablers identified in this research include institutionalizing systems engineering, development and communication of product development roadmaps, augmentation of phase gate review process and critical parameter characterization. Operational recommendations from this research are considered to be possible to implement without significant changes to existing processes and organizational structures.

scholarly journals MODERN STATE OF PROFESSIONAL EDUCATION

2020 ◽  
pp. 91-97
Author(s):  
Егор Александрович Колосов
Keyword(s):  
Vocational Education ◽  
Educational System ◽  
Professional Education ◽  
Professional Training ◽  
Educational Technologies ◽  
Main Trend ◽  
Educational Institutions ◽  
Stage Of Development ◽  
Current State ◽  
State Educational

Анализируется современное состояние профессионального образования, которое рассматривается как социальный феномен. Представлены характеристики профессионального образования как составляющей образовательной системы. Отмечается, что современное состояние профессионального образования находится на уровне модернизации в пользу использования инновационных образовательных технологий. Акцентируется внимание на главной тенденции современного профессионального образования – его цифровизации. Ситуация, вызванная COVID-19, привела к тому, что образовательные учреждения были вынуждены перейти на новые форматы обучения (дистанционное и онлайн-обучение). Основными факторами, повлиявшими на данную ситуацию, названы пандемия COVID-19, накопленный международный опыт, современные потребности общества и рыночной экономики. Несмотря на технологические и организационные трудности, выработаны общие подходы к профессиональному обучению дистанционно и онлайн, создана база образовательного контента. The article analyzes the current state of vocational education. Vocational education is considered as a social phenomenon. The characteristics of vocational education as a component of the educational system at the present stage of development are presented. It is noted that the current state of vocational education is at the level of modernization in favor of the use of innovative educational technologies. Attention is focused on the main trend of modern professional education – its digitalization. Integration of the Russian vocational education system into the world educational system is one of the priorities of the state educational policy. It is noted that the basis of modern vocational education is at the level of modernization in favor of the use of innovative educational technologies. The principles underlying modern education are highlighted: continuity, practice-orientedness, integration, continuous professional development, learning “online + offline. The situation caused by the coronavirus COVID-19 led to the fact that educational institutions were forced to switch to new formats of education (distance and online learning). The main factors that influenced this situation are the COVID-19 pandemic, the accumulated international experience, the modern needs of society and the market economy. It is noted that, despite the technological and organizational difficulties, common approaches to professional training remotely and online were developed, a database of educational content was created.

Evaluation of teaching methods of chemistry concepts through laboratory work: A case study of chemistry department, faculty of natural sciences, Shaheed Professor Rabbani Education University

2018 ◽  
Vol 1 (3) ◽  
pp. 42-48
Author(s):  
Humapar Azhar Rahimi ◽  
Deana Qarizada ◽  
Abdul Hadi Stanikzai
Keyword(s):  
Teaching Methods ◽  
Teaching And Learning ◽  
Laboratory Work ◽  
Laboratory Equipment ◽  
Problem Solving Skills ◽  
Learning And Teaching ◽  
Complex Concept ◽  
Active Teaching ◽  
Evaluation Of Teaching ◽  
Department Faculty

This research has been carried out under the title of (Evaluation of teaching methods of chemistry concepts through laboratory work). The main objective of this research is to investigate learning and teaching methods, concepts that are taught by laboratory works and the challenges that may the teaching and learning methods face from the perspective of lecturers and students. In this research, to collect the statistical information a type of applications method and combined methods (related to library and region) has been used. In view of Cochran formula and Morgan table. The sampling method was selected systematically on random bases. In addition, the questionnaires were distributed to (136) students and (8) lecturers and their comments were collected. Based on the result of this study, researchers and lecturers have made it clear that the teaching methods of the concepts of chemistry by using laboratory works are directly related to various subjects in a complex concept, and students are taught by the activity of exploratory, exploration, problem-solving skills, and project centered. However, it can be possible in existence of sufficient materials and equipment. The majority of students and lecturers reminded the lack of laboratory, equipment and lack of knowledge of lecturers from active teaching methods of the laboratory.

Monitoring of Staffing Nanoindustry

2019 ◽  
pp. 488-500
Author(s):  
Maxim M. Grekhov ◽  
Victor A. Byrkin ◽  
Oleg S. Vasiliev ◽  
Polina A. Likhomanova ◽  
Alexey M. Grekhov
Keyword(s):  
Russian Federation ◽  
Subject Area ◽  
Highly Qualified ◽  
Current State ◽  
Educational Processes ◽  
The Subject ◽  
The Russian Federation ◽  
Scopus Database ◽  
Nanotechnology Industry

Leading organizations of the national nanotechnology network (NNN) monitor staffing and develop mechanisms for coordination of educational processes of enterprises of the nanotechnology industry. To estimate the current state of training for nanotechnology industry in the leading universities of the Russian Federation, a study of their publications indexed in the Scopus database in 2012, 2014, and 2015 years in the subject area of “nano” was made. As a result of analysis, the universities, which form the background for the production of highly qualified specialists in the field of nanotechnology, were determined.

Сurrent trends of professional training for future specialists in public administration

2019 ◽  
Vol 2 ◽  
pp. 15-23
Author(s):  
Юліана МАЛИК
Keyword(s):  
Public Administration ◽  
Professional Training ◽  
Scientific Work ◽  
Professional Activity ◽  
Practical Training ◽  
Highly Qualified ◽  
Management Communication ◽  
Professional Activities ◽  
High Level ◽  
New Generation

One of the most important terms for the development of modern Ukrainian society is the need for training such experts in any field, which are able to carry out their professional activity effectively, especially in conditions of the constant changes in the social and economic environment. Reforms in many spheres of Ukrainian society's life cause the needs for highly qualified specialists of the new generation who, after graduating from higher education establishments, receive, in addition to deep theoretical knowledge, practical training for performing high-level professional activities that will lead Ukraine to new world standards. Thus, in this article author exposes current tendencies of professional training for specialists in public administration. The professional activity of managers in any field is considered as a system of actions aimed at solving professional tasks within the framework of management communication. The author emphasizes that taking into account the current trends that have been studied in this scientific work, it is important to notice that the field of public administration is a complex formation of interrelated elements and the effectiveness of this will depend on a qualitative system of professional training for future specialists.

ADDRESSING THE AUDIENCE: PAUL SAMUELSON, RADICAL ECONOMICS, AND TEXTBOOK MAKING, 1967–1973

2020 ◽  
Vol 42 (2) ◽  
pp. 177-198
Author(s):  
Yann Giraud
Keyword(s):  
Class Struggle ◽  
Active Role ◽  
Economic Education ◽  
The Other ◽  
Editorial Team ◽  
Liberal Politics ◽  
Sixth Edition ◽  
Current State ◽  
The One ◽  
New Generation

Historians of economics rarely consider textbooks as more than passive receptacles of previously validated knowledge. Therefore, their active role in shaping the discipline and its image is seldom addressed. In this paper, I study the making of Paul Samuelson’s successive editions of Economics from 1967 to 1973 as an instance of how textbooks stand at the crossroads between disciplinary knowledge, pedagogy, and larger political and societal concerns. In the mid-1960s, Economics, now at its sixth edition, was at the height of its success. Considered one cornerstone of modern economics, it was also at the center of a number of criticisms dealing with the current state of the economic discipline and its teaching in the universities. While the profession expressed its concern over the lack of relevance of economics to address the pressing issues of the day and pleaded for a new “problem-solving” approach to economic education, the late 1960s witnessed the emergence of a new generation of “radical” economists criticizing the economics orthodoxy. Their contention that mainstream theory had neglected the issues of class struggle and capitalist exploitation found a favorable echo among an increasingly politicized population. Using archival materials, I show how Samuelson, helped by his editorial team at McGraw-Hill, attempted to take into account these changes in order to ensure the continuing success of subsequent editions of his text in an increasingly competitive market. This study emphasizes Samuelson’s ambiguous attitude toward his contenders, revealing, on the one hand, his apparent openness to discussion and outsiders’ suggestions, and, on the other hand, his firm attachment to mildly liberal politics and aversion to Marxism, unchanged through revisions. It also helps refine a notion that is often invoked but never fully expounded in textbook studies: that of the audience.

Sign in / Sign up

Export Citation Format

Share Document