Justification of technical solutions of intercar gangway based on solid-state mathematical modeling
Justification of constructive solutions of intercar gangway is based on solid-state mathematical modeling methods of three-carriage home passenger trains set coupling. Possibility of buffer system refusal is justified by their replacement on intercar oscillation absorbers, zones of their arrangements and rational parameters are defined.
FEATURES OF THE METHODOLOGY FOR CALCULATING BUOYANCY AND STRENGTH OF A BLOCK PONTON FOR VERTICAL CYLINDRICAL TANKS
The paper considers a technique for analyzing the strength and buoyancy of block pontoons for vertical cylindrical tanks used for storing liquid oil products. A model is proposed for performing calculations by the finite element method of a pontoon for buoyancy and strength, taking into account the action of pushing forces. The results of calculations on strength and buoyancy of an aluminum pontoon with foam-urethane filling BPA5000 are presented. It has been established that BPA5000 pontoons have sufficient strength and buoyancy, as regulated by GOST 31385-2016.
Determination of Optimal Ball-Burnishing Parameters for Plastic Injection Moulding Steel
The objective of this study is to determine the optimal plane ball-burnishing parameters for plastic injection moulding steel PDS5 on a machining centre by utilising the Taguchi’s orthogonal array method. The design and manufacture of a burnishing tool are described. Four burnishing parameters, namely the ball material, burnishing speed, burnishing force and feed, were selected as the experimental factors in Taguchi’s design of experiments to determine the optimal burnishing parameters which have the dominant influence on surface roughness. The optimal burnishing parameters were found after carrying out the experiments specified by Taguchi’s L18 orthogonal table, by the analysis of variation, and by a full factorial experiment. The optimal plane burnishing parameters for the plastic injection moulding steel PDS5 were a combination of a tungsten carbide ball, a burnishing speed of 200 mm/min, a burnishing force of 300 N and a feed of 40 μm. The surface roughness Ra of the specimen can be improved from about 1 μm to 0.07 μm by using the optimal burnishing parameters for plane burnishing.