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Higher Study | Mechanical Vibrations | Undamped Free Vibration

Whirling speed of the shaft is the speed at which
A three rotor system has following number of natural frequencies.
When no external force acts on a body after giving it initial displacement, the vibration of the body under this conditions is also known as:
An undamped spring-mass system with mass m and spring stiffness k is shown in the figure. The natural frequency and natural period of this system are ω rad/s and T s, respectively. If the stiffness of the spring is doubled and the mass is halved, then the natural frequency and the natural period of the modified system, respectively, are
The Smallest and largest natural frequencies of a 'n' degree freedom system are ω1 and ωn respectively. The approximate natural frequency estimated by Rayleigh’s and Dankerley’s methods is ωr and ωd respectively. Which of the following statements is true?
Which of the following are responsible for occurrence of critical or whirling speed of shaft?  1. Eccentric mounting of the rotor 2. Non-uniform distribution of rotor material 3. Bending of shaft due to the weight of the rotor and the shaft itself 4. Environmental effect such as effect of moisture and temperature Select the correct answer using the code given below.
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