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Strength analysis of the traction electric motor bolted fastening of a tram car with a lateral drive suspension

https://doi.org/10.46845/1997-3071-2024-72-115-125

Abstract

The strength problem of the traction motor bolted fastening is investigated when it is placed sideways on the tram car bogie. Such arrangement creates unfavorable conditions for the bolts to perceive the acting loads, which requires a detailed consideration of the bolts stress state. Geometrical models of traction motor and adjoining bogie fragments have been constructed, as well as an assembly based on them in order to study their joint strain by an external load. The preparation of the computational model also includes the finite element discretization, setting the material properties and ways of fixing components. To describe the interaction between traction motor and the bogie supporting surfaces, the conditions of one-way contact have been used; the presence of fasteners is simulated by means of connectors provided for this purpose, with indicating the bolts geometric parameters and the preload value, which allows simulating the operating conditions of bolted connections. The numerical analysis of the model under the constant and variable loads application has been done. In this case, the constant load on the bolts is due to their pretension and the traction motor weight; the variable load is caused by the dynamics of the bogie movement along the rail track, when significant accelerations are possible. Based on the obtained force factors values in the connectors, the stress state parameters of the fastening bolts has been calculated. It has been discovered that the bolt of fastening the traction motor to the lower horizontal support, at a distance from the gravity center, is the most stressed. It has been shown that under operational conditions there is a risk of the bolts breakdown due to noncompliance with strength requirements. Based on the study results, the activities to reduce the negative external loads effect on the fasteners working conditions have been proposed.

About the Authors

V. G. Sukiasov
Kaliningrad State Technical University
Russian Federation

Vladimir G. Sukiasov, PhD in Engineering, Associate Professor 

Kaliningrad 



S. V. Fedorov
Kaliningrad State Technical University
Russian Federation

Sergey V. Fedorov, Doctor of Engineering, Professor, Head of the Department of Theory of Mechanisms and Machines and Machine Parts

Kaliningrad



A. V. Pankratov
MGE «Kaliningrad-Gor Trans»
Russian Federation

Andrey V. Pankratov, Chief Engineer 

Kaliningrad



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For citations:


Sukiasov V.G., Fedorov S.V., Pankratov A.V. Strength analysis of the traction electric motor bolted fastening of a tram car with a lateral drive suspension. KSTU News. 2024;(72):115-125. (In Russ.) https://doi.org/10.46845/1997-3071-2024-72-115-125

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ISSN 1997-3071 (Print)