锥篮离心机转鼓结构有限元仿真与模态分析

Finite Element Simulation and Modal Analysis of Drum Structure of Conical Basket Centrifugal

建立了锥篮离心机转鼓的三维有限元模型并进行了力学仿真,得到了转鼓的径向和轴向变形、应力分布、最大应力点以及振动模态,并对薄膜应力和局部应力进行了进一步的应力分析。结果表明:在静力作用下转鼓大端发生最大位移,最大应力点位于转鼓大端第1圈孔的上边沿;原设计转鼓的刚度和强度均满足要求;转鼓系的第1阶固有频率为32.95Hz,发生第1阶模态振动时,转鼓整体绕主轴往复旋转,其固有频率比转鼓系的工作频率26.7Hz高,在正常运行条件下,离心机不会发生共振现象。

Radial and axial deformations,stress distribution,maximum stress position and vibration mode of the drum structure of the conical basket centrifugal were received by establishing its finite element model and mechanical simulation.A further analysis of film stress and local stress had been carried out.The result shows that：under the effect of the static force,maximum displacement of the open end of the drum occurs,maximum stress position of the drum is at the upper edge of first row of holes.Both the intensity and the stiffness assessments of the drum can satisfy the needs.The first-order natural frequency is 79Hz.When the first-order vibration mode appears,rotary motion back and forth of the whole drum round its axis will happen,and its natural frequency is higher than 26.7Hz the working frequency of the drum system.Resonance of the conical basket centrifugal will not happen under the usual service conditions.