Vehicle hunting stability is closely related to wheel/rail contact characteristics and vehicle mass-stiffness-damping system features. Wheel profile features, such as tread shape, wheel flange shape, wheel diameters and equivalent conicity, which are key factors affecting the wheel/rail contact characteristics, would change during the vehicle operation. Meanwhile, the variations of suspension stiffness or damping also occur. Parameter variations would affect the vehicle safety domain. Based on the actual wheel wear and changes of primary suspension stiffness, the effects on vehicle nonlinear stability are investigated in this paper by the multi-body dynamics simulation software SIMPACK. Wheel profiles were measured in a re-profile interval (around 200,000km) and classified into 5 profile cases, S1~S5. Longitudinal stiffness and lateral stiffness are supposed to be in proportion to design values. Considering the idea of orthogonal design, sensitivity of the critical speed is quickly analyzed. It is found that wheel wear is more sensitive to critical speed and the effects of the three parameters on critical speed are not the same. For the case of profile S4 or S5, the range of longitudinal stiffness should be narrowed in order to keep critical speed at 300km/h and above. The reasonable range of longitudinal stiffness for a S4-profile vehicle is the narrowest. The percentage of critical speed decrement caused by worn wheels doesn't exceed 30%. Adjustment of longitudinal and lateral stiffness can compensate the speed loss. For the S4-profile vehicle, stiffness change can compensate loss by 13%. Along with the aggravation of wheel wear, the stability region becomes narrow and the capability of the stiffness to compensate speed loss is limited gradually. More attention should be paid to the changes of suspension parameters and wheel profile in vehicle service for the purpose of good stability.


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    Title :

    Effect of Worn Wheel Profile and Primary Stiffness Change on Railway Vehicle Nonlinear Stability


    Contributors:
    Li, Yan (author) / Zhang, Weihua (author)

    Conference:

    Second International Conference on Transportation Information and Safety ; 2013 ; Wuhan, China


    Published in:

    ICTIS 2013 ; 1850-1856


    Publication date :

    2013-06-11




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English




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