间隙条件下刨煤机刨头接触碰撞动态特性研究

摘要

Horizontal clearance and vertical one between plough head and sliding framework were considered.The criterion of contact-impact between plough head and sliding framework were established with the collision detection method using the distance between a point and a line.The plough head's dynamic equation with 3-DOF vibro-impact under clearance conditions was established by using a nonlinear spring-damper contact force model.The numerical simulation was performed by using Runge-Kutta method.The results showed that there are single-point impact,two-point impact and three-point impact between plough head and sliding framework under clearance conditions;the maximum collision force at each contact point between plough head and sliding framework firstly increases and then decreases with increase in vertical clearance,and increases with increase in horizontal clearance.The plough head's dynamic model was adopted for simulation with RecurDyn.The results agreed well with those of the theoretical analysis.%考虑了刨头与滑架之间的水平和竖直间隙，通过点到直线的距离来进行碰撞检验的方法，构造了刨头与滑架接触碰撞判别条件。采用非线性弹簧阻尼接触力模型，建立了间隙条件下的刨头三自由度碰撞振动动力学模型，并采用龙哥库塔法进行数值仿真分析，分析表明间隙条件下刨头与滑架之间产生了单点、两点、三点碰撞；刨头与滑架各接触点的最大碰撞力随着竖直间隙的增大而先增大随后降低，随着水平间隙增大而逐渐增大。采用 RecurDyn 对刨头动力学模型进行了仿真，其结果与理论分析相吻合。