21-03-2017, 11:22 AM
Noise control is increasingly important for a wide variety of OEM designers. Examples of products that take into account noise control considerations during their design cycles include equipment such as computer hard drives, household appliances, material handling and transportation equipment, etc. In the transport market, which includes the aeronautical, terrestrial and maritime segments, the demand is for low noise targets. Achieving these goals is of paramount importance for OEMs to remain competitive or maintain market supremacy.
The automotive industry has been a leader in the adsorption of noise control technologies. Methods in use for several years for the prediction of internal noise levels include: finite element method (FEM), statistical energy analysis (SEA) analysis of border elements (BEA), etc. The internal combustion engine has machined the world. Since the beginning of the 20th century, it has been our main source of mechanical power. The large number of internal combustion engines in the world today has resulted in air pollution, noise pollution, etc.
There has been a direct relationship between the improvement in the physical level of life of man and the degree of his development of machines. The industrial revolution was really a series of social and industrial transformations, beginning in England with the use of coal instead of coal for the smelting of iron, advancing through the stages of steam engines and electric motors and all production and Processing enabled by these devices. From the age of gasoline, sea and air to various types of transportation.
On the other hand, the automation of witnesses of mechanical progress and the use of nuclear energy; But with each new machine creates a little noise, with each mechanism used to do the work of man, it becomes acoustic power some mechanical or electrical power, so that with the increase of the standard of living of people also occurs An increase in noise Level of the confines of people.
Noise from internal combustion engine:
A typical engine noise classification technique separates aerodynamic noise, combustion noise and mechanical noise.
1. AERODYNAMIC NOISE
2. NOISE OF COMBUSTION
3. MECHANICAL NOISE
1. AERODYNAMIC NOISE
Aerodynamic noise includes exhaust gases and intake air noise, as well as noise generated by cooling fans, auxiliary fans or any other airflow.
2. NOISE OF COMBUSTION
Combustion noise refers to the noise generated by the vibrating surfaces of the engine structure, engine components and engine accessories after combustion excitation.
3. MECHANICAL NOISE
Mechanical noise refers to the noise generated by the vibrating surfaces of the engine components and the engine accessories after the excitation by the alternating or rotating engine components.
The automotive industry has been a leader in the adsorption of noise control technologies. Methods in use for several years for the prediction of internal noise levels include: finite element method (FEM), statistical energy analysis (SEA) analysis of border elements (BEA), etc. The internal combustion engine has machined the world. Since the beginning of the 20th century, it has been our main source of mechanical power. The large number of internal combustion engines in the world today has resulted in air pollution, noise pollution, etc.
There has been a direct relationship between the improvement in the physical level of life of man and the degree of his development of machines. The industrial revolution was really a series of social and industrial transformations, beginning in England with the use of coal instead of coal for the smelting of iron, advancing through the stages of steam engines and electric motors and all production and Processing enabled by these devices. From the age of gasoline, sea and air to various types of transportation.
On the other hand, the automation of witnesses of mechanical progress and the use of nuclear energy; But with each new machine creates a little noise, with each mechanism used to do the work of man, it becomes acoustic power some mechanical or electrical power, so that with the increase of the standard of living of people also occurs An increase in noise Level of the confines of people.
Noise from internal combustion engine:
A typical engine noise classification technique separates aerodynamic noise, combustion noise and mechanical noise.
1. AERODYNAMIC NOISE
2. NOISE OF COMBUSTION
3. MECHANICAL NOISE
1. AERODYNAMIC NOISE
Aerodynamic noise includes exhaust gases and intake air noise, as well as noise generated by cooling fans, auxiliary fans or any other airflow.
2. NOISE OF COMBUSTION
Combustion noise refers to the noise generated by the vibrating surfaces of the engine structure, engine components and engine accessories after combustion excitation.
3. MECHANICAL NOISE
Mechanical noise refers to the noise generated by the vibrating surfaces of the engine components and the engine accessories after the excitation by the alternating or rotating engine components.