Method for secondary spring load equalization of railway vehicles with two-stage spring suspension: Modeling and optimal regulation

Abstract

To ensure running safety, the secondary spring loads of railway vehicles must be well equalized. Due to the coupling interactive effects of these hyper static suspended structures, the equalization adjustment through shimming procedure is quite complex. Therefore, an effective and reliable method in application is developed in this paper. Firstly, the best regulation of spring load is solved based on a mechanical model of the secondary suspension system, providing a target for actual adjustment. To reveal the relationship between secondary spring load distribution and shim quantity sequence, a forecasting model is constructed and then modified experimentally with consideration of car body’s elastic deformation. Further, a gradient-based algorithm with a momentum operation is proposed for the load optimization. Effectiveness of the whole method has been verified on a test rig. It is experimentally confirmed that this research provides an important basis for achieving an optimal regulation of spring load distribution for multiple types of railway vehicles.

Keywords

railway vehicle / secondary spring load equalization / optimal regulation / shimming procedure / elastic deformation

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