Сравнительная оценка динамической нагруженности длиннобазных вагонов-платформ

Abstract

Objective: Comparative analysis of dynamic loading of long-base fl atcars on bogies of various types. Methods: Comparison of experimental data of running strength tests of long-base fl atcars obtained by the Engineering Center of the rolling stock in the conditions of a test site on the Belorechensk–Maikop track of the North Caucasian Railway was carried out. The division of platform cars into conditional groups was used depending on the truck. Results: It was found that the use of constant contact side bearers in the bogie design reduces the dynamic loading of the fl atcar on straight track sections by 1,2–1,5 times. The obtained dependences of the coeffi cients of vertical dynamics for the center and side sill showed that for all fl at cars they are identical in nature and differ only in the level of values. The use of modern bogies with nonlinear spring suspension and constant contact side bearers in long-base fl atcars leads to a decrease in the dynamic loading of the frame by an average of 15–25 %, thereby reducing the likelihood of possible damage to the fl atcar in operation. Practical importance: It is shown that it is necessary to clarify the normative dependence of the speed distribution of the vertical dynamics coeffi cients for fl atcars on various types of bogies. Its correction will improve the accuracy of determining the parameters of the stress-strain state of the platform car frame. The comparison results can be recommended for practical use in assessing the strength and fatigue resistance of the fl at car structure