Abstract
The study aims to develop a measuring circuit to determine the loads acting on the side frame of the bogie from the wheelset when the wagon is moving. The paper reviews and analyzes experimental methods for measuring the vertical and lateral forces acting on the side frame of the bogie from the wheelset when the wagon is moving. Theoretical studies of the stress-strain state of the side frame of a freight wagon bogie were carried out using the finite element method under the action of loads on the axle opening from the wheelset. As a result of theoretical studies by the finite element method, the places for the installation of strain gauges were determined, and a method for processing the received signals was selected. The developed measuring scheme makes it possible to determine the spatial force effect acting on the side frame of the bogie from the wheelset, which makes it possible, without increasing the number of measuring channels in the equipment, to reduce the number of strain gauges for measuring the considered loads while running dynamic tests. In addition, it improves the accuracy of measurements of vertical loads, with the help of which the coefficient of dynamic addition of unsprung parts of the bogie is calculated.
Highlights
When conducting field trials of freight wagons, it is important to determine their dynamic qualities accurately, which are determined by the calculation-empirical method [1,2,3,4]
These indicators are calculated through the values of the vertical and lateral loads acting on the side frame of the bogie from the wheelset and are used to calculate the safety factors against wheel derailment and overturning stability, which is directly related to safety issues during the movement of rolling stock [7,8,9]
As a result of the analysis of the diagrams of the distribution of normal stresses arising on the side frame of the bogie under the action of vertical, longitudinal and lateral forces, it was found that the most promising is the placement of four strain gauges 2 on the upper outer part of the upper chord of the side frame 1 in the area between the jaw guides, which limit the movement of the wheelset
Summary
When conducting field trials of freight wagons, it is important to determine their dynamic qualities accurately, which are determined by the calculation-empirical method [1,2,3,4]. Among the indicators of the dynamic qualities of wagons, one can single out the coefficient of dynamic addition of unsprung parts and frame forces (figure 1) [5,6]. These indicators are calculated through the values of the vertical and lateral loads acting on the side frame of the bogie from the wheelset and are used to calculate the safety factors against wheel derailment and overturning stability, which is directly related to safety issues during the movement of rolling stock [7,8,9]
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