锥篮离心机转鼓系的动态性能分析

Dynamic analysis for drum system of cone-shaped basket type centrifuge

建立了锥篮离心机转鼓系的三维有限元模型,对转鼓系进行了动态分析,得到了转鼓系的固有频率和振型。在此基础上,进一步研究了转鼓系的结构参数对动态性能的影响。研究结果表明:转鼓系的固有频率随着支承刚度的增大而逐渐增大,但增大的幅度较小;支承刚度的变化对固有频率的影响较小;转鼓系的固有频率随大端直径、轴长及质量的增大而减小,且减小的幅度较大,对固有频率的影响较为明显;转鼓系的固有频率随着支承跨距、轴径的增大而增大,其中支承跨距的变化对固有频率的影响较大。这些数据为锥篮离心机的结构优化提供了设计依据。

Three-dimensional finite element models were established, and dynamic analysis was performed for the drum system, inherent frequency and vibration mode of the drum system were received. Based on this, a further research of dynamic performance influenced by various drum structural parameters was carried out. The result showed, inherent frequency of the drum system increased gradually with increase of bearing stiffness, but the amplitude of increase was comparatively small, impact of bearing stiffness upon inherent frequency was lesser. Inherent frequency of the drum system decreased with increase of big end diameter, axle length and mass, and the amplitude of decrease was comparatively great. Impacts of these parameters upon inherent frequency were obvious. Inherent frequency of the drum system increased gradually with increase of bearing span and axle diameter. Impact of bearing span upon inherent frequency was compara- tively great. These data would provide basis of design for the transformation and optimization of the cone-shaped basket type centrifuge.