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Zhou Z.-Y.,Southwest Jiaotong University | Zhou Z.-Y.,CSR Meishan Rolling Stock Co. | Li F.,Southwest Jiaotong University | Li H.-L.,CSR Meishan Rolling Stock Co. | And 2 more authors.
Jiaotong Yunshu Gongcheng Xuebao/Journal of Traffic and Transportation Engineering | Year: 2013

Through analyzing the stress and stiffness series parallel relations of correlative structures, the geometry and stiffness parameters determining the shear stiffness of wheelsets radial device for K7 sub-frame self-steering radial bogie were defined, and the mathematic calculating formula for the shear stiffness of wheelsets radial device was established. Based on vehicle system dynamics analysis technology, the required shear stiffness of wheelsets radial device was determined as 11 MN·m-1. Considering the practical constrained conditions of bogie structures, the matching design of geometry and stiffness parameters for the components of wheelsets radial device was carried out. First of all, the diagonal brace angle and axial tension-compression stiffness of link bar were respectively determined as 42° and 150 MN·m-1. Further, the required structural transverse stiffness of sub-frame, deduced by the mathematic calculating formula of shear stiffness, should not be below 23.6 MN·m-1. Then, aiming at the requirement of the parameters, the corresponding structural design of sub-frame was carried out. Considering the contact fitting relations among different components, the high-precise nonlinear FE assembly analysis model of wheelsets radial device was established. Calculation result shows that the final structural transverse stiffness is 24 MN·m-1, so the design requirement for the shear stiffness of wheelsets radial device is achieved. The calculated shear stiffness is 11 MN·m-1 and equals to the required design value, so the reliability of mathematic calculating formula and design method for the shear stiffness is verified. Source


Zhou Z.-Y.,Southwest Jiaotong University | Zhou Z.-Y.,CSR Meishan Rolling Stock Co. | Li F.,Southwest Jiaotong University | Pan S.-P.,CSR Meishan Rolling Stock Co. | And 2 more authors.
Tiedao Xuebao/Journal of the China Railway Society | Year: 2013

The shear stiffness of wheelsets radial device is the key technical parameter of the sub-frame bogie. It directly determines the hunting stability of car and also has important effect on the curve negotiating ability. Through analyzing the correlative structure stress and stiffness series & parallel relations, the geometry and stiffness parameters which determine the shear stiffness of wheelsets radial device were defined, the mathematic calculating formula was then established and its accuracy was verified by using the high precise FE model. This mathematic calculating formula provides necessary theoretical support for the parameter design of the shear stiffness of wheelsets radial device. Source


Li H.-L.,Southwest Jiaotong University | Li H.-L.,CSR Meishan Rolling Stock Co. | Li F.,Southwest Jiaotong University | Pan S.-P.,CSR Meishan Rolling Stock Co. | And 2 more authors.
Jiaotong Yunshu Gongcheng Xuebao/Journal of Traffic and Transportation Engineering | Year: 2013

In order to realize wheel-rail low track force performance of bogie for heavy haul feight car, a new low track force radial bogie configuration was given based on the heavy haul transportation state of Chinese railway and the running experience of ZK7 type radial bogie. The improvement focused on sub-frame structure: comparing to the holistic prototype, each axle-box had an independent adapter mounted on sub-frame by tow rivets. The vehicle-track coupling dynamics model with C70EF type gondola and standard Chinese track parameters was established through the multi-body system dynamics software SIMPACK. The wheel-rail dynamics behaviour and the force law between sub-frame and adapter were discussed. The FEM simulation and fatigue test for sub-frame connection reliability were carried out. Analysis result indicates that, compared to ZK7 type bogie, when the new radial bogie passes through a 0.01 rad sinking track joint, the wheel-rail low frequency force approximately reduces by 10.78%; when it runs on AAR5 irregular track, the wheel-rail vertical and lateral forces respectively reduce by about 2.98%-4.03%, 2.96%-9.77%, and the vehicle wheel-rail wear friction power reduces by about 5.03%-29.46%. The stress of adapter connection rivet inside is obviously bigger than the one outside, where the maximum shear stress is about 58.13 MPa. The maximum stress near rivet orifice is about 180.76 MPa. Both of them are less than the material allowable values 128 MPa and 345 MPa respectively. The connection fatigue strength and running reliability are sufficient. Source


Patent
Csr Meishan Rolling Stock Co. | Date: 2013-04-04

A sub-frame radial bogie comprises wheelsets, a side frame, a swing bolster, a wheelset radial device and a brake gear. Bearing adapters (

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