Abstract
To overcome defects caused by the complex structure and unstable damping performance of the wedge-type damper, a new lever-type friction damper has been developed for use in freight bogies; the design allows the advantages of traditional three-piece bogies to be retained. A detailed description of the structure and mechanism of the lever-type damper is provided, followed by a stress analysis using the finite element method. Dynamic performance characteristics of the lever-type damper and the wedge-type damper are compared in terms of the nonlinear critical speed, riding index, and curve negotiation. The results indicate that the maximum stress of the lever remains below its yield limit. The lever-type car has higher running performance reliability, and achieves similar nonlinear critical speed, riding index, and curve negotiation when compared with the wedge-type car.
Highlights
With the rapid development of Chinese heavy haul railway, it is increasingly necessary to improve transportation efficiency
To overcome defects caused by the complex structure and unstable damping performance of the wedgetype damper, a new lever-type friction damper has been developed for use in freight bogies; the design allows the advantages of traditional three-piece bogies to be retained
Dynamic performance characteristics of the lever-type damper and the wedge-type damper are compared in terms of the nonlinear critical speed, riding index, and curve negotiation
Summary
With the rapid development of Chinese heavy haul railway, it is increasingly necessary to improve transportation efficiency. Like many developed countries that use heavy haul technology, China works to improve its railway transportation efficiency by increasing axle load, decreasing the empty weight, raising running speed, and adding more vehicles to each train. According to statistics from 2001 [13], of the 8,120 bolsters that were overhauled in Zhanjiang Depot, 2,368 bolsters were flawed in 2,815 faulty bolsters, and the bolster with flaws at the end structure is 2,137, accounting for 75.9 % of all flawed bolsters This indicated that the use of a wedge-type damper reduces the reliability of the bolster. This article introduces a new lever-type damper with a simple structure for use in three-piece freight bogies. The dynamic performance of a lever-type car is analysed and compared with a wedge-type car to verify its feasibility
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