Railways Technical Ability Vibration Analysis Question Bank Vibration Analysis

  • question_answer A slender shaft supported on two hearings at its ends carries a disc with an eccentricity e from the axis of rotation. The critical speed of the shaft is N. If the disc is replaced by a second one of the same weight but mounted with an eccentricity 2e, critical speed of :he shaft in the second case is:

    A) \[\frac{1}{2}N\]                        

    B) \[\frac{1}{\sqrt{2}}N\]

    C) N                                 

    D) 2N

    Correct Answer: C

    Solution :

    \[{{\omega }_{n}}={{\omega }_{c}}=\sqrt{\frac{k}{m}}\] Critical speed is not a function of eccentricity. Hence critical speed does not change.

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