Critical speed algorithm of multidiameter agitating shaft based on VB

LIN Qing

(Mechanical and Electronic Engineering Department,Suqian College, Suqian 223800, China)

Abstract: In order to calculate critical speed of multidiameter agitating shaft with impellers,a critical speed algorithm was proposed. Multidiameter agitating shaft with impellers was simplified as the shaft without any impeller and multidiameter parts. The critical speed value of this part can be calculated by the traditional algorithm. Then, critical speed value of the deducted components was calculated by classical algorithm and integral method. Eventually, the critical speed of original agitating shaft was obtained by dunkerley formula. The algorithm was programmed by VB software, the first order critical speed value of several commonly used agitating shafts was calculated. The results were compared through ANSYS software.The results indicate that the algorithm is simple,convenient and correct.

Key words: multidiameter agitating shaft; critical speed ; VB; algorithm