Patterns of deformation of the pneumatic spring of the high-speed rolling stock depending on the internal pressure and the applied external static load
DOI:
https://doi.org/10.33216/1998-7927-2024-282-2-70-77Keywords:
pneumatic spring, rubber cord shell, deformation, force, internal pressureAbstract
The basis of safe operation of modern high-speed railway rolling stock is compliance with its dynamic and traffic safety indicators. The purpose of the article is to study the patterns of deformation of the rubber-cord shell of the pneumatic spring of modern high-speed railway rolling stock depending on the magnitude of the applied external load and internal pressure in the spring. To achieve this goal, a special design of the stand and a program of experimental tests of the pneumatic spring were developed, which involved measuring vertical and horizontal deformations using modern measuring technologies. The change in the values of internal pressure and applied external load took place with the help of a high-pressure compressor and a hydraulic jack, respectively. High-frequency linear displacement sensors were used to measure vertical and horizontal deformations. The internal pressure in the spring changed in steps of 0.5 atm. On the basis of the conducted research, the dependence of the vertical movement of the fastening plate, as well as the vertical and horizontal deformation of the lower part of the rubber-cord shell on the value of the manometric pressure in the pneumatic spring was constructed. It was established that an increase in the value of the manometric pressure in the pneumatic spring leads to a decrease in the maximum force of the external load, which is necessary to deform the spring to its limit value. A certain agreement was noted between the deformation of the rubber-cord sheath in the horizontal direction with the difference between the vertical movement of the fastening plate and the deformation of the lower part of the rubber-cord sheath in the vertical direction. The scientific novelty of the obtained results lies in the experimental establishment of the patterns of deformation of the rubber-cord shell of the pneumatic spring in the vertical and horizontal directions depending on the change in pressure in the pneumatic spring and the applied external load. That will allow to more accurately model the operation of the pneumatic spring taking into account the deformation characteristics of the rubber-cord shell and determine its dynamic characteristics, which is necessary at the stage of designing modern high-speed railway rolling stock when determining the safe conditions of its operation.
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