Noise control is becoming increasingly
important for a wide variety of OEM designers. Examples of products that take
noise control considerations into account during their design cycles include
equipment such as computer hard drives, house appliances, material handling and
transportation equipment etc,. In the transportation market, which includes
aircraft, ground and marine segments, the demand is for low noise level goals.
Achieving these goals is of primary importance for OEM to be continue to be
competitive or to keep a given supremacy in the market. The automotive industry
has been a leader in the adsorption of noise control technologies. Methods in
use for several years for the prediction of interior noise levels include :
finite element method(FEM), statistical energy analysis (SEA) boundary element
analysis (BEA) etc. The internal combustion engine has mechanized the world.
Since the early 1900s it has been our prime source of mechanical power. The vast
number of internal combustion engines in the world today has resulted in air
pollution, noise pollution etc.
DEFINITIONS
OF SOUND
Sound can be defined as the perception
of vibrations stimulating the ear. If scientifically taken into account, sound
is a periodic disturbance in fluids density or in the elastic strain of a
solid, generated by vibrating objects. These waves or vibrations propagate in
two basic ways.
1. longitudinal waves.
2. Transverse waves
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