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Failure of motor bushing on rail vehicle

The bushing of the motor suspension of a motor bogie was found to be conspicuous and was dismantled for further analysis. The visual inspection showed cracks on the surface, which led to a massive reduction in the stiffness of the element. This subsequently led to an impact in the fixed stop, which is not operationally intended in this way.

 

Solution approach:

In order to analyse the failure behaviour of the motor bushings, numerical simulations and service life calculations were first carried out. Real measurement data from operational measurements, which were provided by the customer for the investigation, served as a basis. Subsequently, iterative design studies were carried out to improve the component in order to find an optimal solution. Finally, the new prototype of the bushing was tested on a dynamic test field.

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Results:

Through our cause analysis, an optimised design for the motor bushings could be developed for the customer. The theoretically calculated service life increase by a factor of 10 has now been confirmed by the experimental service life test, which means that the component is qualified for the planned service life of 1.8 million kilometres.

FE-model in damage calculation software DACA
Interpolation point space of real measurement data