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Abstract
Aluminum alloys and composite materials are used in the body structures of modern passenger railway cars, which required the use of new manufacturing technologies: extrusion, pultrusion, etc. The use of new materials and new production technologies is changing the design requirements of passenger rail cars. The use of computer-aided design systems, in particular, SolidWorks Simulation, allows you to optimize the profile of cellular panels used in the construction of the body of a passenger railway car and obtained by extrusion or 3-D printing. Purpose of this work is to optimize the design stage of the enclosing structures of the body of a passenger railway car made of cellular profile panels, which can significantly reduce the heat transfer coefficient of the body walls and their mass, as well as provide the necessary strength conditions. Optimal profile of the vacuum panel, consisting of two rows of hexagonal cells, provides, according to calculations, the value of the specific thermal resistance R = 2.922 (m2 K)/W, which is 16.5% more than that of the existing body structure of a passenger rail car.
Highlights
Modern passenger railway cars operated in the northern regions of Russia need a body guard that has the maximum possible thermal resistance, since its value significantly affects the amount of energy spent on heating (Shavyrin et al, 2017)
In the modern design of the passenger railway car body, thermal insulation is used with a thermal conductivity coefficient of 0.032 W/(m K) and a thickness of 80 mm, the value of the specific thermal resistance is 2.5 (m2 K)/W
An experimental study of the optimal geometry of the vacuum panel allowed us to establish the dependence of the specific thermal resistance of the vacuum panel on the value of the residual pressure
Summary
Modern passenger railway cars operated in the northern regions of Russia need a body guard that has the maximum possible thermal resistance, since its value significantly affects the amount of energy spent on heating (Shavyrin et al, 2017). With an increase in the number of electric energy consumers in a passenger car, there is a need to reduce energy consumption for heating by designing new enclosing structures of the body that have a higher thermal resistance (Balalaev et al, 2018a). Ensuring the strength and thermal insulation properties of the body of a modern passenger railway car is usually achieved by using sandwich panels that include a layer of thermal insulation (Önder and Robinson, 2020). The authors proposed to seal the panels of the honeycomb structure, to vacuum their internal cavities, and to use such panels as thermal insulation of the body of a railway passenger car (Balalaev et al, 2015a, 2015b, 2018a). The heat engineering properties of vacuum thermal insulation obtained from a panel of cellular structure are evaluated
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