The diagram shows the noise levels generated by various sources within a process plant. Although the various sources have substantially different sound pressure levels, all the sources must be addressed for the purposes of noise control. It is a function of temperature, pressure, frequency and atmospheric composition. The implications to the measurement of acoustic background and to the prediction of sound pressure levels are discussed with reference to the spectral content of a range of acoustic sources. Variations in predicted levels of between 2dB and 40dB have been observed and comments are offered on the reasons for these variations.
All calculations involve error which can jeopardise the validity of results and calculations.
An awareness of error and the methods of dealing with it are essential to the confidence in acoustic prediction techniques for both acousticians and end users. A glossary of terms relating to this site. Many of the terms have been directly referenced from within this site. Additional terms are constantly being added to the list.