Mechanical Vibration

WE are familiar with the term vibration; a vibrating object oscillates to and fro, back and forth. Here we would include mechanical vibrations or say machine vibrations.

Some of our daily experiences of vibration in our daily lives are a pendulum set in motion, a plucked guitar string, vehicles driven on rough terrain also vibrate, and geological activities can cause massive vibrations which we know as earthquakes.

How can we say that something is vibrating? By touching a vibrating object and feel the vibration. We can also see the back-and-forth motion of a vibrating object. Sometimes oscillation creates sounds that we can hear or heat that we can feel. Do you wanna observe how vibration can create sound and heat, rub your feet back and forth on a carpet and could feel it.

In industrial plants there is the kind of vibration that should be concerned of I.e. machine vibration.

Now what is machine vibration? It is simply the back and forth motion of machines or machine components. Any component that moves back and forth or oscillates is vibrating, here it is machine component.

Machine vibration can take multitude of forms. A machine component may vibrate over a range of distances, rapidly or slowly, and with or without perceptible sound or heat. Machine vibration can often be customized and so have a functional purpose.

To note that not all kinds of machine vibration are undesirable. For instance, conveyors, vibratory feeders, sieves, hoppers,surface finishers and compactors are often used in industry.

Many time mechanical vibration can be unintended and lead to unexpected damage. Most times mechanical vibration is unintended and also undesirable. This article is about the supervising of undesirable machine vibration.

Shown below are some examples of undesirable machine vibration.

Some terminologies of vibrations:

Oscillating Motions :

The vibratory motion of elastic bodies and the force associated.

Any body possessing mass and elasticity can vibrate.

Oscillatory systems can be categorized as linear or nonlinear.

Linear systems :

This holds principle of superposition.

Nonlinear systems :

They doesn’t hold the principle of superposition.

But the technique for the analysis of the nonlinear systems are less known and hence difficult to apply.

Again there are two basic classes of vibrations:

Free vibrations :

When a system oscillates under the action of inherent forces due to initial disturbance, and in absence of any external forces.

Forced vibrations :

These vibration occur under the influence of external forces.

Hope you like this article on mechanical vibrations.

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