结构动力学, 高方平筛, 有限元法, 断裂, 应力

The rupture and its several influence factors on the short crossbeam of sieve case during square plansifter operation were investigated. Aimed at the system consisting of a square plansifter and some suspenders, the FEM was employed to establish structural dynamics model for obtaining dynamic response. According to the contrast of the vibration data of sieve body in experiments and the displacement response from FEA，the finite element model was modified. Results show that the position where the maximum stress happens in FEA and the actual rupture position are the same. Furthermore, the effects of various parameters including mass, rotational speed and offsetting of eccentric object, rectangle-section size and thickness of short crossbeam, the level and vertical pressing force on stresses of three dangerous positions were calculated and analyzed. The results presented herein possess an important reference value to structural improvement and dynamic optimization of square plansifter.