Behaviour of Sound with Practical Examples

This dossier presents a set of noise control principles in the form of general techniques with practical examples for each. They deal both with factors influencing noise generation and with factors influencing the propagation of noise in materials, structures and rooms.

 

First of all, noise must be limited at its source. When solving a noise problem, ask, "What is the cause of the noise disturbance?" The question has to be answered. The described techniques mostly use noise reduction, which directly reduces noise generation. However, most techniques have limited use and may not be available for all possible situations.

 

Numerous factors can cause noise. Extensive measurements are often required before deciding which measure to try first. It is often not sufficient to use just one of the techniques shown to reduce noise. In most cases, several different actions need to be performed to achieve the desired result.

 

Different symbols are used to make the drawings easier to understand, eg. large arrows to indicate high noise emission, small arrows to indicate less noise, wavy lines to indicate noise from the structure, etc. In a particular case, different symbols were used which merely clarified the problem in question.