Railways Technical Ability Vibration Analysis Question Bank Vibration Analysis

  • question_answer When a vehicle travels on a rough road whose undulations can be assumed to be sinusoidal, the resonant conditions of the base-excited vibrations, are determined by the:

    A) Mass of the vehicle, stiffness of the suspension spring, speed of the vehicle, wavelength of the roughness curve

    B) Speed of the vehicle only

    C) Speed of the vehicle and the stillness of the suspension spring

    D) Amplitude of the undulations

    Correct Answer: A

    Solution :

    \[\beta =\frac{\omega }{{{\omega }_{n}}},\] \[{{\omega }_{n}}=\sqrt{\frac{k}{m}},\,\,\omega =\frac{v}{\lambda }\] Where v = vehicle speed, \[\lambda \,\,=\,\,\]wave length of rod undulations                         \[\therefore \,\,\,\,\,\,\,\,\,\,\,\beta \,\,=\,\,f\,(m,k,v,\lambda )\]


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