Dnipropetrovsk National University of Railway Transport named after Academician V. Lazaryan

About: Dnipropetrovsk National University of Railway Transport named after Academician V. Lazaryan is a education organization based out in Dnipro, Ukraine. It is known for research contribution in the topics: Track (rail transport) & Bogie. The organization has 736 authors who have published 655 publications receiving 1468 citations. The organization is also known as: Institute of Railway Transport Engineers.

Features of design of tied-arch bridges with flexible inclined suspension hangers

Abstract: Purpose . Investigation and analysis of the hanger arrangement and the structural stability of a Network arch bridge – a tied-arch bridge with inclined hangers that cross each other at least twice. It is also necessary to make a comparative analysis with other types of hanger arrangements. Methodology . The authors in their research investigated a large number of parameters to determine their influence in the force distribution in the arch. Eventually they determined optimal values for all parameters. These optimal values allowed developing a design guide that leads to optimal arch design. When solving this problem, the authors used three-dimensional finite element models and the objective was to determine the most suitable solution for a road bridge, with a span of 100 meters, consisting of two inclined steel arches, located on a road with two traffic lanes, subjected to medium traffic. The virtual prototype of the model is performed by finite element simulator Midas Civil. Findings . In this study, for the bridge deck, a concrete tie appears to be the best solution considering the structural behavior of network arches, but economic advantages caused by easier erection may lead to steel or a composite bridge deck as better alternatives. Design requirements and local conditions of each particular bridge project will decide the most economic deck design. Originality. To ensure passenger comfort and the stability and continuity of the track, deformations of bridges are constricted. A network arch is a stiff structure with small deflections and therefore suitable to comply with such demands even for high speed railway traffic. A network arch bridge with a concrete tie usually saves more than half the steel required for tied arches with vertical hangers and concrete ties. Practical value . Following the study design advice given in this article leads to savings of about 60 % of structural steel compared with conventional tied arch bridges with vertical hangers.

Historical-philosophical-legal research of the phenomenon of the gender as the factor of the social status of the ukrainian woman

Abstract: Topicality . Under the conditions of Ukraine’s integration into the European community, there is an urgent need to restructure all social institutions, freeing them from all forms of discrimination, including on the basis of gender. Modern problems of the state's socioeconomic development require a new look at the functional roles of men and women, as well as the understanding that the political, economic, cultural future of society depends on overcoming gender stereotypes that are deeply rooted in the social and individual consciousness and inhibit social progress, and also the development of democracy. That is why, today, it is extremely important to study the issue of social influence and the role of women and determine their social status against the backdrop of the historical development of our state. Purpose. The article studies the emergence and adoption of the phenomenon of gender as a factor of the social status of the Ukrainian woman in the historical, philosophical and legal realm. Methodology. In the research process the authors used the methods of analyzing and synthesizing historical sources to study the content and main provisions of philosophical concepts and legal norms that formed the social status of a Ukrainian woman at different historical periods of society development, with their subsequent comparison and generalization. Originality. The work further develops the theory of gender processes with the use of interdisciplinary approaches to the study of the phenomenon of gender in the historical, philosophical and legal field as a factor of the social status of the Ukrainian woman, to critically re-evaluate the value guidelines on the construction of modern society and the formation of new ideas about the role and model of behavior of men and women and their interaction in society. Conclusions. For a long time, the social status of women was formed under the influence of philosophical views and concepts, slowly turned into the moral traditions of peoples and the rule of law. The high status of a woman, as a full-fledged member of society, formed in the early state stages, lost its relevance already in the days of antiquity. The woman became a symbol of exclusively domestic, family relations and played the role of guardian of the private foundations of the social being of men. This trend found its continuation in the Roman Empire, significantly increased in the Middle Ages and left an imprint in the philosophy of modern times and German classical philosophy. In the period from Kievan Rus to the twentieth century, the Ukrainian woman remained a victim of stereotyped thinking. Despite the normative settlement of the equality of men and women in modern conditions, this equality has a purely declarative nature.

Reduced operating costs by train traffic optimization

Abstract: The paper conducted research to reduce the cost of electricity for traction power in the wholesale electricity market. Our calculations show that the previously known criteria for evaluating energy consumption in the market conditions are irrelevant.

Modeling the optimization process of investments in development of the enterprise taking into account random costs

Abstract: Purpose. The study aims at substantiating the method to determine the optimal volume of investments for improving basic economic indicators of the enterprise’s performance selected by the company management at random costs at each stage of its development. Methodology. The proposed methodology for determining the optimal investment volume is based on simulation modeling methods and optimal control theory, in particular, the dynamic programming procedure, since the controlled process of the enterprise`s development is a multi-step one. Using step-by-step planning with generation of costs for transitions and statistical processing of results, a solution to optimization problem was obtained, to which the methods of mathematical analysis cannot be applied. Findings. An algorithm has been developed for calculating the minimal volume of capital investments for improving selected economic indicators and constructing the optimal trajectory for the enterprise`s development from the initial economic state to the final desired state. This takes into account unforeseen intermediate costs in the process of enterprise development. Originality. It is shown that using the methods of the theory of optimal control and simulation modeling, it is possible to calculate the minimal amount of capital investments to improve the selected economic indicators that determine the efficiency of the enterprise performance, taking into account the random costs of intermediate transitions by the development stages. Such calculation does not depend on the specific content of economic indicators. Practical value. The proposed methodology for calculating the minimal volume of capital investments is quite simple, but at the same time it allows, on the one hand, determining the priority areas of the enterprise’s investment activities. On the other hand, it increases the manageability and transparency of the enterprise’s economic activity, and increases the manager’s confidence in the correctness of the decisions made.

Modeling of the building local protection (shelter – in place) including sorbtion of the hazardous contaminant on indoor surfaces

Abstract: Purpose. Chemically hazardous objects, where toxic substances are used, manufactured and stored, and also main lines, on which the hazardous materials transportation is conducted, pose potential sources of atmosphere accidental pollution.Development of the CFD model for evaluating the efficiency of the building local protection from hazardous substantives ingress by using air curtain and sorption/desorption of hazardous substance on indoor surfaces. Methodology. To solve the problem of hydrodynamic interaction of the air curtain with wind flow and considering the building influence on this process the model of ideal fluid is used. In order to calculate the transfer process of the hazardous substance in the atmosphere an equation of convection-diffusion transport of impurities is applied. To calculate the process of indoors air pollution under leaking of foul air Karisson & Huber model is used. This model takes into account the sorption of the hazardous substance at various indoors surfaces. For the numerical integration of the model equations differential methods are used. Findings. In this paper we construct an efficient CFD model of evaluating the effectiveness of the buildings protection against ingress of hazardous substances through the use of an air curtain. On the basis of the built model a computational experiment to assess the effectiveness of this protection method under varying the location of the air curtain relative to the building was carried out. Originality. A new model was developed to compute the effectiveness of the air curtain supply to reduce the toxic chemical concentration inside the building. Practical value. The developed model can be used for design of the building local protection against ingress of hazardous substances.