Changzhou, China
Changzhou, China

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Ma W.,Southwest Jiaotong University | Ma W.,CSR Qishuyan Locomotive Co. | Song R.,Southwest University | Luo S.,Southwest Jiaotong University
Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit | Year: 2016

This paper discusses the mechanism responsible for the formation of polygon-shaped wheels; the aim is to solve the problem of their occurrence on subway vehicles. This phenomenon occurs mainly as a result of wheel/rail vertical forces created by the vibration of the wheelset over several complete revolutions of the wheel. In addition, a relationship linking the phase angle between two adjacent vertices, the main vibration frequency and running speed of the polygonal wheel is derived. Then, considering a subway vehicle that is powered by a linear induction motor and applying the multi-body system dynamics model, the main frequency of the wheel/rail vertical force under various running speeds is investigated. Analysis of the speed and main frequency value of a subway vehicle covered in this study revealed that a polygonal wheel with nine vertices can be generated in the speed range 72 to 80 km/h. © 2014 Institution of Mechanical Engineers.


Ma W.,Southwest Jiaotong University | Ma W.,CSR Qishuyan Locomotive Co. | Song R.,Southwest University | Xu J.,Tongji University | And 2 more authors.
Shock and Vibration | Year: 2015

To study the characteristics of the coupling vibration between a maglev vehicle and its track beam system and to improve the performance of the levitation system, a new type of vibration test bench was developed. Take a single maglev frame as the study object; simulation of the coupling vibration of the maglev vehicle, levitation system, and track beam were achieved. In addition, all types of real track irregularity excitations can be simulated using hydraulic actuators of the test bench. To expand the research scope, a simulation model was developed that can conduct the simulation research synergistically with the test bench. Based on a dynamics model of the test bench, the dynamics simulation method determined the influence on the levitation control performance of three factors: the track beam support stiffness, the track beam mass, and the track irregularity. The vibration resonance phenomenon of the vehicle/track system was reproduced by the dynamics simulation, and a portion of the simulation results were validated by the test results. By combining the test bench and the dynamics model, experiments can be guided by the simulation results, and the experimental results can validate the dynamics simulation results. © 2015 Weihua Ma et al.


Ma W.,Southwest Jiaotong University | Ma W.,CSR Qishuyan Locomotive Co. | Luo S.,Southwest Jiaotong University | Song R.,Southwest University
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2012

Aimed at the wheel polygonization problem of the subway vehicle, discussed the forming reason of the wheel polygonization, put forward the innovation point that the wheel polygonization is caused by the wheel/rail vibration during many wheel rolling circles, and derived the relation between the phase angle of the vertex, main vibration frequency and the running speed of the polygonization wheel. Take one kind of linear induction motor subway vehicle for example, based on the multi-body system dynamic model, the main frequency of the wheel/rail vertical force under different speed is researched, the speed and main frequency which easily induced the wheel polygonization with 9 vertexes is analyzed, and pointed out that the wheel polygonization with 9 vertexes of the subway vehicle maybe formed during the speed scope from 72 km/h to 80 km/h. Take the case of 72 km/h and 80 km/h for example, the results of the wheel/rail vertical force and the main frequency is given in the paper, as well as the LIM of the front bogie. Simulation results show that the wheel polygonization with 9 vertexes maybe formed by the vibration with the frequency of 39.08 Hz and 43.48 Hz. The phase angle changes between the different speeds are present and the sketch map of the wheel polygonization with 9 vertexes is given, too.


Ma W.,Southwest Jiaotong University | Ma W.,CSR Qishuyan Locomotive Co. | Song R.,Southwest University for Nationalities | Liu W.,Southwest Jiaotong University | Luo S.,Southwest Jiaotong University
Wear | Year: 2014

This paper addresses the problem of asymmetric flange wear of a particular type of 3-axle (2C0-type) locomotive that runs on the Chinese railway system. In particular, the influence on wheelset asymmetric wear of errors in the longitudinal location of the journal box is examined. Based on a 2C0-type locomotive dynamics model, the influence of the journal positioning deviation at each wheelset on wheelset lateral displacement and wheelset deflection direction within the same bogie have been researched. Simulation results indicate that a positioning deviation at the first wheelset has a great effect on the lateral displacement of the first wheelset, whereas deviations at the middle and the third wheelset have a great influence on the lateral displacement of the middle wheelset and less influence on other wheelsets. When a positioning deviation exists in two wheelsets at the same time, an anti-phase deviation will have a greater influence and more easily produce asymmetric flange wear than a same-phase positioning deviation. This study suggests that asymmetric flange wear can be minimised by eliminating or decreasing positioning deviations of wheelset journal boxes. © 2014 Elsevier B.V.


Ma W.-H.,Southwest Jiaotong University | Ma W.-H.,CSR Qishuyan Locomotive Co. | Qu T.-W.,Southwest Jiaotong University | Qu T.-W.,CNR Institute of Neuroscience | And 2 more authors.
Jiaotong Yunshu Gongcheng Xuebao/Journal of Traffic and Transportation Engineering | Year: 2013

The dynamics model of 2C0 locomotive was set up, wheelset axle-box positioning deviations were analyzed, and the influence of each wheelset axle-box positioning deviation on wheelset lateral displacement and wheelset deflection direction for the same bogie was simulated. Simulation result shows that the axle-box positioning deviation of the first wheelset has greater influence on its lateral displacement, the middle and third wheelset have greater influence on the lateral displacement of the middle wheelset, and the lateral displacement can reach 6.0 mm when the positioning deviation is 2.4 mm. When the deviations exist in any two wheelsets at the same time, the anti-phase positioning deviation has greater influence and more easily results in the partial wear of wheel flange than the same phase positioning deviation, and the lateral displacement can reach 6.5 mm when the combined axle-box positioning deviation is 1.6 mm. The partial wear can be effectively improved by adjusting the positioning deviation.

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