Everything you need to learn about reducing and controlling noise. Introduction: It may not be possible to have a total elimination of annoying sounds but attempts should be directed to reduction at source, reduction of the duration of exposure etc. The sounds generated and transmitted in air directly to human ears are known as air borne sounds. The air-borne noise [...]
In this article we shall consider methods of reducing exposure to noise from traffic, as distinct from the methods for reducing noise at the source through improved vehicle design. These methods, which are applied in different ways from place to place, are essentially of three types: 1. Noise reduction by urban planning and road design (including the use of sound [...]
There are five fundamental and distinct approaches to gear noise reduction available to the acoustical engineer: 1. Change the basic gear type or material. 2. Modify the tooth profile. 3. Introduce damping or shock reducing material 4. Increase the transmission loss TL of the gear box. 5. Total enclosure. Often a combination of selected measures from each approach is required [...]