Continuous 〔 ⊃perati く 〕 P of rDtating machinery w 〒 th a rotor cra ¢ k is a risk GonditiQn s 工 llce the rQtor crack grows rapid ! y and may faH causing a catastrophic accident 、 This paper develDps tlle finite 』 element model of the rotating shaft with an open crack . The arlalytical method for the ca ] cu ] atjon of the natural frequencies ofsuch a rotor system wi し h an oper 罵 rack is investigated , and the modeling of the open crack eleinent is discussed . The natural frequency of the

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... mental system is rrieasurcd for various positjons and depths 〔 }f the 〔 } pen crack . By comparing both the theoretical a ユ ユd experimental results of the natural frequellcies、 亡 he accuracy Df the developcd fin { te eIement model of the rotating shaft with an Qpen crack ls clarified .