Vibration refers to a mechanical phenomenon in which waves of motion are transmitted from a point of origin to the regions in contact as oscillations. Pressure waves, sound waves and even seismic waves spread and create impact through vibrations. Some of the real-life examples of oscillatory motion are:
- Vocal cords in humans
- Motion of a turning fork after a physical impact
- Pendulum of a clock striking
- Loudspeaker diaphragm
- Mobile phone
A noise in machines and a factor in scheduling maintenance
Vibrations in machines such as turbines, fans, motors, mining equipment, tractors, cooling towers, metallurgical machines, gearboxes etc are considered as noise and serve as indicators of faulty functioning of these machines. This principle forms the basis of predictive and preventive maintenance, which have resulted in better operation, reliability and higher production combined with economic benefits in industries.
The faulty working of these machines is recorded by dedicated sensors which detect the increase in amplitude (decrease in rotational frequency of rotating machines and machine speed) of vibratory motion and this data is then analyzed to initiate maintenance.
As the principle of operation in industries
Vibrations are not undesired in all applications. There are numerous handheld devices and large-scale industrial machine across various sectors, which function on the basis of these oscillatory motions. The typical examples range from exercise machines to large equipment in mining and metallurgy. Industries working in the sector of mechanical operations like construction, sugar industry, environmental management, chemical etc depend hugely on vibratory machines. Starting from simple operations such as sieving, settling, compacting, and feeding, the applications are wide.
Some of the typical examples are oscillating sanders and vibratory tumblers which remove materials based on particle properties like size, density, and shape and finish surfaces. Feeders in the field of construction use vibratory hoppers to feed raw materials into a crushing machine, vibratory rollers, concrete mixers etc. for compacting fill materials and concrete settling also, vibrators are used. Thus, these industries are almost entirely dependent on vibrations for their operations.