Dynamic performance of six-axle locomotive subjected to asymmetric brake shoe forces
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Dynamic performance of six-axle locomotive subjected to asymmetric brake shoe forces LIU Peng-fei(刘鹏飞)1, 2, ZHANG Kai-long(张凯龙)2, CAO Yun-qiang(曹云强)2 1. State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang 050043, China; 2. School of Mechanical Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China © Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Abstract: To research the influence of asymmetric brake shoe forces(ABSF) induced by braking failure on the dynamic performance of six-axle locomotive, the static equilibrium model of three-axle bogie and dynamic model for locomotive are established. The coupling vibration equations of axle hung motor and wheelset are derived. For the air braking, the influence mechanism of ABSF on the wheel-rail asymmetric motion and force characteristics are discussed. It can be found that if the ABSF is applied in the front wheelset, all the wheelsets move laterally in the same direction. Once the ABSF occurs in the middle or rear one, other wheelsets may move laterally towards the opposite direction. The motion amplitude and direction of all wheelsets strictly depend on the resultant moment of suspension yawing moment and brake shoe asymmetric moment. For the asymmetric braking, the free lateral gap of axle-box could increase the wheelset motion amplitude, but could not change the moving direction. In both the straight line and curve, the ABSF may lead to wheelset misaligning motion, intensify the wheel-rail lateral dynamic interaction and deteriorate wheel-rail contact state. Especially for the steering wheelsets, the asymmetric braking increases the wheelset attack angle significantly, which forms the worst braking condition. Key words: locomotive; brake shoe force; dynamic performance; asymmetric braking; wheel-rail contact Cite this article as: LIU Peng-fei, ZHANG Kai-long, CAO Yun-qiang. Dynamic performance of six-axle locomotive subjected to asymmetric brake shoe forces [J]. Journal of Central South University, 2020, 27(9): 2776−2791. DOI: https://doi.org/10.1007/s11771-020-4498-4.
1 Introduction The foundation brake rigging is an important component in the locomotive which is generally equipped with the unit brake. However, the braking failure has been a noticeable problem in the vehicle maintenance. For the six-axle locomotive of HXD, the failures of brake shoe seizure occurred 9 times within one year from March, 2013 to April, 2014, the brake unit has to be replaced and even the
wheels need to be repaired [1]. Earlier in 2004, it was reported that 7 braking units in 5 locomotives of DF8B failed without braking shoe forces [2]. The suspended connecting rod of unit brake in locomotive even fractured in some special cases, which affected the normal brake application [3]. The wheel-rail degraded adhesion issue in braking maneuver and its corresponding quantification method were studied by BOSSO et al [4]. Whether the brakes shoe s
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