The feasibility of installing sin-beams in the load-bearing structure of the open car
DOI:
https://doi.org/10.31498/2225-6733.42.2021.240690Keywords:
transport mechanics, wagon, load-bearing structure, SIN-beam, frame strength, dynamic load capacityAbstract
The scientific substantiation of SIN-beam installation into the load-bearing structure of a nonversatile filling car was carried out. The research was carried out with regard to the freight car model 12-757 produced by Krukivsky Carriage Works. Use of SIN-beams as the main bearing elements of the frame reduces its weight by 6% in comparison with the frame of the prototype car. The strength of the frame of the car with SIN-beams as load-bearing elements has been calculated. At that, the SolidWorks Simulation program complex was used, which implements the method of joined elements. Spatial isoparametric tetrahedrons were used as the joined elements. It was found that the maximum equivalent loads occur in the area of interaction between the trunk beam and the kingpin beam are close to 335.3 MPa and do not exceed the permissible values. The maximum displacements are centered in the central part of the frame and are about 29.0 mm. The main indices of the load-bearing structure dynamics of the freight car were determined. The calculation was carried out under the conditions of empty wagon running with steep nerves, as a case of the highest load of the load-carrying structure. When carrying out the calculations, the parameters of the suspension arm of the model 18-100 were taken into account. At the same time, the investigation was carried out in the flat coordinate system. The differential equations of motion were developed in the MathCad software package. The calculation was carried out by the Runge-Kutta method. It was found that the indicators of the dynamics of the car are within the permissible limits. The maximum acceleration of the wagon body in the center of mass is 4.8 m/s². The acceleration of the cars is 5.7 m/s². In this case, the evaluation of the movement of the wagon is «excellent». The conducted research will contribute to the creation of innovative carriage designs, reduction of costs for their production, as well as increasing the efficiency of railway transport functioning
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