Dynamic characteristics of two-way coupling between flip-flow screen and particles based on DEM

Two-way coupling between screen surfaces and particles can provide more actual reference to the system dy- namic analysis of screening machine. However,the algorithm of flexibility is so complex that the part of contact of both cannot be calculated due to the disability of interface does not support the import of flexible models when performing co-simulation among EDEM and RecurDyn. Aiming at the problems proposed currently,the method of piecewise linear interpolation will be adopted to verify the equivalence of similar panels and flexible panels. Bending and shrunk ratio of pores have been calculated,under static and inner dead point position in the mid-point of similar panels,and com- pared with catenary to find relative tolerance,identifying the feasibility of equivalent method. The influence of eccentricmass,dip angles and size composition on screening efficiency,production ratio and vibrating velocity have been stud- ied. The results indicate that screening efficiency will increase as each of three parameters decreased nonlinearly. Pro- duction ratio will decrease disproportionally with the increment of eccentric mass,which will reach minimum under 25% of hard-screening,but the relationships with dip angles and size composition is opposite. Additionally,the eccen- tric mass is set as for optimum between screening efficiency and production ratio. The content of size composition has a less effect on particles velocities,while the increases of eccentric mass and dip angles lead to the increment of particles velocities gradually. This paper provides a research thought for further revelation of motion rules of moist fine coals and for dynamic analysis of flip-flow screen surfaces.