Ray models for sound propagation and attenuation in ducts, in the absence of mean flow

✍ Scribed by B.J. Tester

• Publisher: Elsevier Science
• Year: 1973
• Tongue: English
• Weight: 694 KB
• Volume: 27
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1016/s0022-460x(73)80359-1

✦ Synopsis

Ray models are constructed for describing the sound fields in lined, two dimensional ducts due, respectively, to a point source and a line source. Corrections for non-specular reflection and for multiple reflection are included. Fields calculated by using the models are compared with the corresponding exact fields . The results show that very reasonable accuracy can be obtained (especially when the appropriate correct ions are included in the model) from such models when used to describe the sound field in a duct up to at least distances of the order of three duct widths from the source. Thus, it is concluded that for many applications in duct acoustics, ray models are sufficiently accurate and preferable in use to mode models because of the possible savings in computation time. Also they can provide a clearer, more direct picture of the physics of the interfering waves making up the sound field.