CSR Ziyang Locomotive Co.

Yanjiang, China

CSR Ziyang Locomotive Co.

Yanjiang, China
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Ma W.,Southwest Jiaotong University | Ma W.,CSR Ziyang Locomotive Co. | Luo S.,Southwest Jiaotong University | Rongrong S.,Southwest University for Nationalities
2010 International Conference on Computer, Mechatronics, Control and Electronic Engineering, CMCE 2010 | Year: 2010

The damage of the tumbler node was one of the common phenomena of the damage of the tumbler journal box setting. Aimed to the easy damage problem of the tumbler node of the CW-2 style bogie, two positioning method of the tumbler journal box was compared, one is the tumbler journal box of the CW-2 bogie, the other is the tumbler journal box on the high speed motor car of CRH 2. The position of the journal box spring has a big influence to the load of the tumbler node. The dynamic model of the high speed vehicles with the two different tumbler journal boxes were set up through the dynamic simulation soft SIMPACK. The simulation cases of high speed on straight line, brake condition and the condition of the horizon wind were carried to research load of the tumbler node. All the results of the three different cases were coincided with the theory analysis result. The tumbler node of the model which the CRH 2 tumbler journal box was adopted has a big longitudinal and lateral force; the tumbler node of the model which the CW-2 tumbler journal box was adopted not only has a big longitudinal and lateral force, but also has a bigger vertical force. The simulation results shown that the tumbler node of the CW-2 bogie has a bigger and complex force in total, this is the just reason why the tumbler node more easy damaged than other tumbler journal box. © 2010 IEEE.


Zhou J.,Chongqing University | Liu H.,Chongqing University | Liu X.-G.,Chongqing University | Wan X.-Y.,CSR Ziyang Locomotive Co. | She K.-N.,CSR Ziyang Locomotive Co.
Chongqing Daxue Xuebao/Journal of Chongqing University | Year: 2012

The under-filling defect of I-beam in a heavy truck front axle which occurs in the process debugging of the precision roll-forging and die-forging is studied. Finite element models of precision roll-forging and die-forging are established based on FEM software and the previous productive results. Then, the mechanism of the under-filing defect in I-beam is studied. And the effects of the three variables including width B, radius R and slope A of I-beam in the third step on the forging quality are investigated. In addition, the roll-forging die constructions for I-beam in previous three steps are redesigned and manufactured. The productive results show that I-beam can be fully filled, the debugging cycle is reduced significantly and the products quality is guaranteed.


Ma W.,Southwest Jiaotong University | Ma W.,CSR Ziyang Locomotive Co. | Luo S.,Southwest Jiaotong University | Song R.,Southwest University for Nationalities
Chinese Journal of Mechanical Engineering (English Edition) | Year: 2010

A serious wheel out-of-round phenomenon exists in a certain subway vehicle in China. More seriously, the vertical vibration of car body of this subway vehicle will go beyond the restriction of the standard criterion when the wheel out-of-round exceeds 0.2 mm in radial direction. And the wheel out-of-round problem could not be solved by polishing the rail or re-profiling wheels. Aimed at this problem, a further analysis is conducted on the structure and the suspension systems of the subway vehicle. It is thought that the additional stiffness function of the traction bar, caused by the short length and the bigger connection stiffness of the traction bar, leads to the problem that the subway vehicle is sensitive to the vertical impact. By taking into account the stiffness of the traction bar, dynamic simulation models of the subway vehicle are set up to study the influence of the additional stiffness function of the traction bar on the vertical dynamic performance of the subway vehicle through the simulation method. The response of the subway vehicle to vertical impact of a triangle pitch is also simulated. Simulation results indicate that the connection between the car body and the bogie will become rigid and the damping function of the secondary suspension will be decreased due to the additional stiffness of the traction bar in braking condition or running on curve track. Then the vertical response of the car body to vertical impact will be strengthened and the vertical ride index decreased. The vertical dynamic performance of the subway vehicle will be improved through the method of decreasing the connection stiffness of the traction bar, which has been validated by the simulation results. This method of improvement can effectively solve the problem of abnormal dynamic performance of this subway vehicle, and provide a foundation for a new theory about the traction bar system design. © 2010 Chinese Journal of Mechanical Engineering.


Ma W.,Southwest Jiaotong University | Ma W.,CSR Ziyang Locomotive Co. | Lou S.,Southwest Jiaotong University | Song R.,Southwest University for Nationalities
2010 International Conference on Computer Design and Applications, ICCDA 2010 | Year: 2010

The structure of tumbler journal box orientation mode was widely used in the high speed EMU, as it has the excellence of the stiffness in longitudinal, lateral and vertical direction can be set respectively. The longitudinal stiffness and lateral stiffness of the journal box was supplied by the stiffness of the elasticity node of tumbler. The stability of the high speed vehicle has a big relation with the stiffness ofthe elasticity node of tumbler. The dynamic model of the high speed vehicle was set up based on the analysis of the structure of the tumbler journal box in detail. The linear and nonlinear stability analysis of the model in which the parameter of the real vehicle was used was carried out first, the influence of the variable of the longitudinal stiffness and the lateral stiffness of the elasticity node of tumbler to the hunting stability of the high speed vehicle was researched. The stiffness of the elasticity node of tumbler especially the longitudinal stiffness has a big influence to the hunting speed of the high speed vehicle. © 2010 IEEE.


Zhou J.,Chongqing University | Liu X.G.,Chongqing University | Liu H.,CSR Ziyang Locomotive Co. | Wan X.Y.,CSR Ziyang Locomotive Co.
Proceedings of the 10th International Conference on Technology of Plasticity, ICTP 2011 | Year: 2011

Two flaws of a forging front axle of heavy truck in process debugging of precision roll-forging, which are fold in transitional section between spring seat and I-beam and under-filling of I-beam, were studied. First, a novel die construction of side roll-forging was proposed to solve the fold problem by matching roll-forging grooves reasonably. Then, the three main variables for forming of the I-beam, namely B, R and A of the roll-forging die in the third step were analyzed to eliminate the I-beam under-filling defect. The effecting mechanism of the three parameters on the forging quality was investigated by numerical simulation based on the orthogonal experimental design methods. The optimal values for B, R and A are 23 mm, 28 mm and 18°, respectively. The productive results show that the stability of the roll-forging process is realized and the finial products with required quality are approached. In addition, the material utilization rate reaches 90%. This study offers knowledge for the forming of similar products. © 2011 IBF (RWTH Aachen) & IUL (TU Dortmund).


Ma W.-H.,Southwest Jiaotong University | Ma W.-H.,CSR Ziyang Locomotive Co. | Yang J.-J.,Datong Electrical Locomotive Co. | Luo S.-H.,Southwest Jiaotong University | Song R.-R.,Southwest University for Nationalities
Tiedao Xuebao/Journal of the China Railway Society | Year: 2010

The coupler stabilizing principle of Coupler No.13 under the longitudinal compressive force was researched so as to solve the problem of derailment of the locomotive in braking. Take Locomotive SS3B for example. The dynamic model of four locomotives coupled in series to draw a 3 000 t freight train was set up, where Coupler No.13 was used to connect the locomotive and vehicles. The stabilizing ability of Coupler No.13 of the locomotive running on the 30‰ long heavy down grade was studied. The position stop mode was used to restrict the rotation angle of the coupler with respect to the rear frame of Coupler No.13. There was not enough buffing during the course of coupler rotation till it reached the stop, this led the wheel set lateral force and derailment coefficient to their peak values instantaneously when the longitudinal compressive force was applied on the coupler. However, the continuous action of the wheel set lateral force and derailment coefficient were found within the safety restriction zone. The phenomenon could be reproduced by dynamic simulation. The results show that the maximum longitudinal compressive force on Coupler No.13 of Locomotive SS3B running on the 30‰ long heavy down grade is about 1 100 kN and the longitudinal compressive force on the coupler may cause partial abrasion to the wheels in braking.


Zhou J.,Chongqing University | Zhu R.-L.,Chongqing University | Xu W.-J.,Chongqing University | Du S.-G.,CSR Ziyang Locomotive Co.
Neiranji Gongcheng/Chinese Internal Combustion Engine Engineering | Year: 2010

Using software DEFORM-3D, a numerical simulation for the newly developed TR upsetting-bending process of heavy crankshaft with continuous grain flow was conducted to analyze causes of the typical defect. In view of its typical defect-filling insufficient, three key parameters of pre-forging die S, B, R, which had significant influence on the die filling, were discussed emphatically. On this basis, the new type of bending die, so called "constrained wing" construction was proposed. Effect of the two important variables of the "constrained wing" construction, height "h" and length "L" on the crankshaft formation was studied. It is revealed that optimal values for them are within ranges of 15~30 mm and 180~225 mm respectively, which can ensure perfect die filling and lower the forming load. Test on site demonstrates that the new "constrained wing" die eliminates the forming defect and forges high quality crankshaft blank successfully.


Tang Y.,Southwest Jiaotong University | Luo S.-H.,Southwest Jiaotong University | Ji Q.,CSR Ziyang Locomotive Co.
Sichuan Daxue Xuebao (Gongcheng Kexue Ban)/Journal of Sichuan University (Engineering Science Edition) | Year: 2011

Structure design for relative lateral displacement between bogie frame and wheelset is important to wheelset lateral play, which has great influence on flange wear and lateral wheel/rail force. The structure, mechanical properties, function and principle were analyzed and a dynamic model of a 2C 0 heavy locomotive DF 8B for main line was simulated using Simpack. Simulations and calculations of locomotive dynamic performance on curved track were done in several cases, such as the case of different displacement configurations for free and elastic clearance, the case of adding spring with small stiffness within existing free clearance. The results showed that a range of option exists for both free clearances of end axle and middle axle, elastic clearance has little influence on curve dynamic performance and proper addition of spring in existing free clearances improves hunting stability on straight track but has a negative affect on curve negotiation.

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