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.
Methodology features for calculating buoyance and strength of block pontoon in vertical cylindrical tanks
The paper considers a technique for analyzing strength and buoyancy of block pontoons in vertical cylindrical tanks used for storing liquid petroleum products. A model for finite element calculations of a pontoon for buoyancy and strength is proposed, taking into account the buoyancy forces. The calculation results for strength and buoyancy of an aluminum pontoon with foam-urethane filling BPA5000 are presented. It is found that BPA5000 pontoons have sufficient strength and buoyancy, regulated by All-Union State Standard (GOST) 31385-2016.
Limit Wheel Profile for Hunting Instability of Railway Vehicles
Given a railway vehicle and a track, is it possible to define a wheel limit profile that allows the vehicle to run at a given speed without the occurrence of unsafe hunting motion? Nowadays some railway operators and maintenance staff identify the maximum admissible wear on the profiles comparing the rail equivalent conicity with a limit curve obtained on the basis of experimental evidence. The present paper analyses the relationship between equivalent conicity and the dynamic behaviour of the vehicle in tangent track. This can be used to implement condition – based rail reprofiling strategies.