Concepts

THEORIES AND CALCULATIONS

The term vibration means the oscillatory movement of particles of solid bodies.
 
Within the oscillatory phenomenon, there is a particular type of periodic oscillations, which are repeated at intervals of equal time, called periods (T) and within this, are harmonic sinusoidal oscillations, which can be regarded as those caused by the projection on the diameter of a circle point (m) that covers the circumference with uniform circular movements. (fig.1)

FRECUENCY

This is the inverse of the period f = 1/T, its unity is the Hertz (one turn per second). The frequency ratio of rpm is 1 HZ = 60 rpm, the ratio with the static deflexion is given in the following formula: 

The static frequency of the system is that produced when deflexing the insulator as a result of the static load of the machine.
 
The dynamic frequency or exciter is that produced by the machine in motion. 

INSULATORS

They are mechanical elements that transform the kinetics or potential produced by the machine, at work (Fig.2 striped area), they are lineal, meaning that the loads are proportional to the deflexions, their vibratory oscillations are harmonic sinusoidal (Fig.1).