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A heat mathematical model of polymer composite cylinder during microwave treatment
Engineering Education # 01, January 2014
DOI: 10.7463/0114.0658448
УДК: 629.782: 621.763
Traditional technologies of producing epoxy based polymer composite materials (PCM) require a long-term and energy consuming thermal processing. Microwave heating could be used as an alternative technology for heating work pieces made of PCM; this would allow one to reduce treatment time and energy consumption significantly. A mathematical model of temperature distribution inside the cylindrical composite system during microwave treatment was investigated in this paper. The model includes hollow PCM cylinder made of epoxy binder and carbon fibers and solid cylindrical mandrel. Theoretical and experimental results on the temperature state of the system were analyzed and discussed.
Development of mathematical and algorithmic support for determination of internal stresses in thin reflectors made of carbon-epoxy composite during the technological process of manufacturing
Engineering Education # 08, August 2013
DOI: 10.7463/0813.0612095
The main stage of manufacturing precision reflectors is hardening of polymeric matrix which determines the final geometric shape of a product as well as its characteristic. Often, this process takes place in a rigid tool set which restraints changes in the geometric shape. In this connection, during the specified process internal technological stresses appears in the reflector’s material; these stresses could influence precision geometry. This article concerns development of mathematical and algorithmic support for determination of internal stresses and optimization of geometric models in the "reflector – snap" system.
Main approaches to formation of a thermal vacuum test program of precision mirror reflectors of space antennas
Engineering Education # 08, August 2013
DOI: 10.7463/0813.0612062
An obligatory element of mirror space antennas is a reflector which is a thin-walled shell of a parabolic or hyperbolic form. When a spacecraft enters the area of the Earth's shadow, temperature changes may cause temperature deformations; this may lead to distorting the shape and interfering with radiocommunications. For this reason, design decisions regarding mirror reflectors of space antennas must be confirmed by ground tests. A new method for the thermal vacuum test of a full-scale precision space reflector made of carbon fiber-reinforced plastic was proposed in this work. Stability of the reflector’s shape within a wide range of temperatures was estimated by a contactless method; this method is based on heating of a reflector with a solar radiation simulator in a vacuum chamber with its walls cooled by liquid nitrogen.
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