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Motor Vibration and Acoustic Noise
Published in Wei Tong, Mechanical Design and Manufacturing of Electric Motors, 2022
Increasingly strict noise regulations in the United States, European Union, Japan, and China have made the development of new electric machines with low noise emission. Specifically, the European Union has set the tightest harmonized noise limits for various industrial machines, motor vehicles, household appliances, and other noise-generating products. Because of the increased awareness of the harmful effects of high industrial noise levels and government regulations that establish acceptable noise levels in the workplace, noise reduction has become an integral part of machinery safety. Noise abatement is a concern with, for example, generator-steam and gas turbine power plants. As demands for electricity increase, the power industry faces increasing challenges to build and operate efficient and quiet power generators, for example, steam turbines, gas turbines, and electrical generators.
Hearing, Sound, Noise, and Vibration
Published in R. S. Bridger, Introduction to Human Factors and Ergonomics, 2017
The technology for evaluating the auditory environment and for dealing with troublesome noise sources is well established. There is an international trend to lower industrial noise exposures beyond their present levels to further safeguard the hearing of the workforce and improve working conditions. Applied research to investigate cost-effective ways of achieving these reductions is appropriate. Although vibration exposure is linked to many health effects, there is a lack of evidence for dose–response relationships. This hinders the drafting of exposure limits for the prevention of specific effects. The model of Sandover presented above is very much a simplification of what is really a very complex problem.
Acoustic Criteria
Published in Randall F. Barron, Industrial Noise Control and Acoustics, 2002
Regulations for control and limitation of noise date back to early Roman times, when chariot races were prohibited on village streets at night because of the noise associated with the racing. On the other hand, noise was considered beneficial during the Middle Ages, when a town filled with noise indicated prosperity and health of the population. One of the main reasons for promotion of industrial noise control programs, however, is to prevent hearing impairment of workers due to occupational noise exposure.
Acoustic energy flux analysis of the bifurcated waveguide by varying outlet boundaries
Published in Waves in Random and Complex Media, 2022
Haleem Afsar, Yasir Akbar, Gulnaz Kanwal
Acoustics is particularly related to sound and deals with the generation, transmission and reception of sound. In prehistoric eras, acoustics played an important role in controlling sound in stadium, worship places , concert halls, etc. But in recent era, the scope of acoustics is not limited to noise controlling issues and has application in almost all areas of science. It has been divided into different branches including medical acoustics, architectural acoustics, physical engineering acoustics , musical acoustics, etc. The applications of acoustics can be found in noise reduction problems that include architectural noise issues, produced in duct of heating and ventilation system, noise issues in aerodynamic, in road transportation exhaust noise from internal combustion engine and construction and industrial noise machinery, factories and building sites. Noise usually propagates in ducts or pipes. The design of such ducts or pipes plays an important role in noise reduction. Since these are the main sources of energy transmission from one point to another point. The reason for this research is to develop systems that reduce the vibration of structures and the acoustic noise through them. This primarily motivates civil engineers, who always prefer to design structures in such a way as to significantly reduce unwanted noise. Many exhaust systems and modified mufflers are used at a large industrial level to reduce noise.