Three-dimensional rough contact collision characteristics of plow head-sliding framework with coal powder layer
ZHANG Yu1,2, WANG Qian1, CHEN Hongyue3， MAO Jun3
1.School of Mechanical Engineering, Anyang Institute of Technology, Anyang 455000, China;
2.Anyang Key Laboratory of Advanced Aeronautical Materials and Processing Technology,Anyang Institute of Technology, Anyang 455000, China;
3.School of Mechanical Engineering, Liaoning Technical University, Fuxin 123000, China
Abstract：Three-dimensional clearance causes complex contact collision phenomenon between plow head and sliding framework.Coal powder layer aggravates the dynamic characteristics of the system. Based on the geometric characteristics of plow head and sliding framework, a method of reducing the 3D polyhedral collision detection to 2D polygonal collision detection was proposed. Considering the effects of surface roughness and coal powder layer, a three-dimensional contact collision dynamics model between plow head and sliding framework was established, rough interface contact force model and the contact force model with the coal powder layer were introduced, and the restitution coefficient were measured by experiment. A numerical analysis was conducted to obtain the dynamic characteristics of the contact and collision between plow head and sliding framework. The results show that contact collision of plow head-sliding framework has many forms, such as point, line, single-side and multi-surface.With the decrease of restitution coefficient, angle vibration and displacement vibration amplitude of plow head are reduced, contact collision vibration amplitude at the gap boundary is reduced, and collision force average of each point and the number of collisions decreases. Finally, the validity of the collision dynamics model is verified by experiments.
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