VIBRATION

Vibration is the physical movement or oscillation of a mechanical part about a reference position. More often, vibration is undesirable, wasting energy and creating unwanted noise. For example, the vibration motions of engines, electric motors, or any mechanical device in operation are typically unwanted. Such vibrations can be caused by imbalances in the rotating parts, uneven friction, the meshing of gear teeth, etc. Vibration and vibration isolation are both intimately connected with the phenomenon of resonance and simple harmonic motion.

CAUSES OF VIBRATION

Most common problems that produce vibration are listed below

  • Unbalance of rotating parts.
  • Misalignment of coupling and bearing
  • Bent Shafts Worn.
  • Eccentric or damaged gear.
  • Bad bearings-Antifriction type.

CHARACTERISTICS OF VIBRATION

  • A lot can be learned about a machines conditions and mechanical problems by simply nothing its vibration characteristics. Referring to the weight suspended on a spring, the detailed characteristics of vibration can be studied by plotting the movement of the weight against time.
  • The motion of the weight from its neutral position to the top limit of travel back through the neutral position to the bottom limit of travel and its return to the neutral position represents one cycle of motion

CLASSIFICATION OF VIBRATION

Vibration can be classified in several ways. Some of the important classification is as follows:

  • Free and forced vibration
  • Undamped and damped vibration
  • Linear and nonlinear vibration




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