Abstract In order to calculate the critical speed of multidiameter agitating shaft with several impellers, a simple and convenient algorithm was proposed based on traditional algorithms. First, multidiameter agitating shaft with impellers was simplified as twodiameter shaft without any impeller. The critical speed value of this part can be calculated by traditional algorithm. Then, recover the agitating shaft, critical speed value of the added components was calculated by Dunkerley formula and integral method. Eventually, the critical speed algorithm of multidiameter agitating shaft with several impellers was obtained. The algorithm is verified correct by ANSYS software and has been used in engineering design．
CAO Hong-Bei, LIN Qing. A simple critical speed algorithm of multidiameteragitating shaft with several impellers. Chinese Journal of Engineering Design, 2011, 18(5): 369-372.
