列车的可靠制动是其安全运行的必要保证,而制动过程中的防滑控制又是安全制动和缩短制动距离的有效途径。建立车辆制动动力学模型和单轮对制动动力学模型,车辆系统自由度为42,建模中考虑车辆系统悬架力非线性、轮轨接触几何关系非线性和轮轨蠕滑力非线性。考虑到盘型制动系统的摩擦特性和制动缸压力变化特性,建立了制动系统力学模型。采用P控制方法,用数值仿真方法研究准高速列车制动过程的防滑控制。计算结果表明,P控制能有效防止车轮在轮轨粘着力较低时的滑行,从而提高制动的可靠性和缩短制动距离,并减小制动过程中车辆的纵向振动。
The reliable braking is necessary to the running security of railway vehicles, and the anti-sliding control is an efficient way to improve the braking safety and reduce the braking distance. The braking dynamic models of a vehicle and a wheelse t are set up. The vehicle has 42 degrees of freedom. The nonlinear suspension force, nonlinear wheel-rail contact geometry and creep force are considered. The braking system model is constructed by considering the friction character of the braking disk and the pressure changing character of the braking reservoir. P controller is used as the anti-sliding controller. Numerical simulation is adopted in the research of anti-sliding control of quasi-high-speed vehicle. It can be seen from the results that the P controller is efficient to anti sliding when the wheel-rail friction coefficient is low. The longitudinal impulse of the earbody and the braking distance are also reduced.