Noise measurements usually fall into one of two categories. The first category consists of sound level measurements usually made of the dBA level. Common measuring instruments are sound level meters and dosimeters. The second category consists of analyses made in support of environmental noise reduction programmes and product design programmes. In addition to measurement of dBA level, these analyses require [...]
Silencers and mufflers cover a wide range of noise reduction devices and must be considered one of the most powerful weapons available to the acoustical engineer. There is no technical distinction between a muffler or silencer and the terms are frequently used interchangeably; i.e., one manufacturer will use a silencer and another a muffler for the same basic configuration. Despite [...]
Everything you need to learn about controlling noise. General Noise Control Factors: The various general noise factors are as follows: Energy Contained in a Sound Wave: When work is carried out, a minute quantity of the work done by most engineers is not directly converted into useful work or into waste heat but is radiated at sound. It has been [...]