16 Questions
What type of vibrations occur when particles move parallel to the axis of the shaft?
Longitudinal vibrations
Which type of vibrations induce bending stresses in the shaft?
Transverse vibrations
In which type of vibrations do particles move in a circle about the axis of the shaft?
Torsional vibrations
What happens to the shaft during longitudinal vibrations?
It is elongated and shortened alternately
Which type of vibrations induce tensile and compressive stresses alternately in the shaft?
Longitudinal vibrations
When particles move approximately perpendicular to the shaft's axis, what type of vibrations occur?
Longitudinal vibrations
What is the speed at which the shaft runs so that the additional deflection of the shaft from the axis of rotation becomes infinite?
Critical or whirling speed
What factor does the bending of the shaft depend on besides the value of eccentricity?
Speed at which the shaft rotates
What does the force resisting the deflection of the shaft depend on?
Stiffness of the shaft
What happens to the value of y when the circular frequency n exceeds a certain value?
Value of y becomes negative
What is defined as the same as the natural frequency of transverse vibration, with a unit in revolutions per second?
Critical or whirling speed
In a three-rotor system, when do torsional vibrations occur?
When rotors A and B move in opposite directions
In a two-rotor system, where does the node lie?
At Point N
What does C represent in the context of a three-rotor system?
Modulus of rigidity for shaft
What does 'd' represent in a two-rotor system?
Diameter of the shaft
What is represented by 'IA' in a two-rotor system?
Mass moment of inertia for rotor A
Test your knowledge on the three important types of free vibrations: Longitudinal vibrations, Transverse vibrations, and Torsional vibrations. Understand how a weightless constraint system can exhibit different types of vibrations.
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