AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |
Back to Blog
![]() A line source will produce cylindrical spreading, resulting in a sound level reduction of 3 dB per doubling of distance. A busy highway approximates to a line source, that is, equal sound power output per unit length of highway. įor example, in the case of spherical spreading from a point source, which is due to a noise source radiating sound equally in all directions, the sound level is reduced by 6 dB for each doubling of distance from the source (see INVERSE-SQUARE LAW ). Sound propagation losses due to spreading are normally expressed in terms of x dB per doubling of distance from the source. There are two common kinds of geometric spreading: spherical and cylindrical spreading. Geometric spreading is independent of FREQUENCY and has a major effect in almost all sound propagation situations. ![]() This refers to the spreading of sound energy as a result of the expansion of the wavefronts. There are several important factors which affect the propagation of sound: geometric spreading, atmospheric effects, and surface effects. ![]() This variation is caused by changes in weather conditions and by topographical features such as ground cover, hills and other obstacles between the source and the receiver. The levels of outdoor NOISE, whether they are intrusive or the normal background environment, vary extensively at distances greater than about a hundred meters from the source. The TRANSMISSION of acoustic energy through a medium via a SOUND WAVE. ![]()
0 Comments
Read More
Leave a Reply. |