At present, China train pulling heavy tonnage of 20,000 tons has reached, with 9600 kW high-power locomotives in use, when the poor track conditions, surface mount, and the curve through the reduced adhesion when the traction conditions, the full traction powerplayed by the adhesion force between wheel and rail use restrictions. Adhesion when the wheel will have less rigid slip phenomenon stick-slip between wheel and rail vibration will affect the adhesion traction locomotives, and generate complex dynamics.Of wheel-rail adhesion limit state use of the dynamic performance when the locomotive to reveal the typical locomotive adhesion limit state vibration mechanism, a reasonable match bogie parameters, wheel-rail adhesion locomotive fully effective in improving driver performance and dynamic force. Heavy on the railway locomotive traction with theory and engineering applications. The main work is as follows: (1) In order to better express the physical process of skidding motorcycle, made the concept of sliding rate, through the introduction of temperature coefficient of the friction coefficient F, and Kalker weight coefficient K, a small spin non-linear wheel-rail amendment tangential force calculation program, available in different track surface wheel-rail adhesion conditions of stick-slip curve, can reflect the dynamics of the locomotive drive wheel and rail tangential force characteristics. (2) the establishment of a single wheel drive system of the simplified dynamic model, based on the average slip rate of sliding rate and dynamic analysis of adhesion under extreme conditions, the stick-slip vibration of wheel stick-slip vibration process stability and longitudinal vibration regulation of wheel. The results show that stability depends on the wheel stick-slip vibration of wheel and rail tangential force coefficient of the gradient of properties, reduce wheel-rail dynamic average slip rate and slip rate is to increase the stick-slip vibration restore stability and improve the adhesion ability of locomotive the most fundamental way. Stick-slip vibration, when the vertical wheel drive system torsional vibration frequency of multiple natural frequencies, the wheel on the longitudinal vibration resonance and the resonance amplitude is 2 times the maximum. (3) The motorcycle skid and the wheel drive system when the self-excited vibration, stick-slip characteristic curve analysis of gradient drive system vibration characteristics on stability and vibration frequency. The results show that the process of locomotive skidding, wheel-rail adhesion characteristics of a negative slope will make the system unstable, the vibration energy increased, and stimulate the vibration system has a natural frequency of vibration. (4) a flexible positioning of the lateral stability analysis of single-wheel model, the average slip rate due to wheel-rail impact of driving conditions on the lateral stability of a single round of the basic law. The results showed that the wheel-rail adhesion saturation, driving wheel and rail conditions increase the longitudinal shear force can cause reduced torque wheel shook his head, making the round of increases lateral stability, but increases the vertical shear force caused by lateral shear force Instead of reducing the adverse wheel of lateral stability. (5) the use of multi-body dynamics software SIMPACK and numerical simulation software SIMULINK, to HXDlB locomotive, for example, establish a mechanical and electrical, control, integration of dynamic simulation model locomotive, which considered in the model-driven system, wheel-rail stick-slip curve The negative slope characteristics, mechanical properties and the electric drive motor control strategy. Bogie wheel within the same angular velocity and angular acceleration of wheel adhesion poor state judge, by calculating the degree of adhesion of the locomotive using fuzzy control implementation of adhesion control. The results show that the method can significantly improve the adhesion of locomotive utilization. (6) analysis of stick-slip vibration of locomotive and the stick-slip vibration stability of the longitudinal wheel base of wood vibration and other laws. And to clarify the mechanism of stick-slip vibration of locomotive drive system parameters accordingly to optimize the match.Structural parameters such as increasing the locomotive longitudinal position stiffness, coupling torsional stiffness, stiffness and traction motor hanging rod longitudinal stiffness help to improve the adhesion properties of motorcycle and need to match the motor hanging reasonable stiffness and a series of wheel vertical positioning stiffness, to avoid skidding locomotive longitudinal resonance due to reduced wheel adhesion locomotive performance. (7) According to the established virtual prototype locomotive mechanical and electrical integration, and implementation of the adhesion control to wheel-rail adhesion locomotives working in extreme conditions. The results show that the wheel-rail adhesion limit in the state's hunting round on the right and left wheels allows easy access to longitudinal stick-slip sliding rate of the negative slope of curve segments, with the locomotive drive system can stimulate the natural vibration frequency of the vibration, and longitudinal vibration wheel coupled with the rotational vibration. By comparing the analysis of the vibration frequency components and their interaction rules, summarized locomotive drive system to avoid resonance caused by the parameter matching principle.
Keywords: locomotive; driving dynamics; stick-slip vibration; longitudinal vibration; adhesion control;
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