, while, Senior has also made an attempt to solve a problem related to resistive strip configuration. In specific, scattering from resistive, conductive and impedance strips have been considered by Herman et al. Myers' presented an improved form of impedance boundary conditions which were used in, for sound wave diffraction problems.ĭiffraction by strips is a significant and classical subject both in electromagnetic and acoustic wave theory. A related study of diffraction by a finite airfoil in uniform flow is presented by Jeon et al. Later on Rawlins' idea is extended to calculate the diffraction by finite strip and diffraction of spherical acoustic wave from an absorbing plane. Rawlins used Ingard's conditions on the boundaries to discuss scattering of sound waves by a half plane. In continuation to this, diffraction by an absorbent semi-infinite plane having different impedance faces is also examined. Rawlins then considered line source diffraction by an acoustically penetrable or an electromagnetically dielectric half plane having smaller width as compared to the incident wave length. Scattering analysis by metallic tapes on paneled compact range reflectors and the line source diffraction of electromagnetic waves by a perfectly conducting half plane was investigated by Jones. These problems constitute a canonical problem for the GTD (geometrical theory of diffraction). Many classical problems related to electromagnetic waves diffraction due to line source and point source have been studied so far. The scattering of sound and electromagnetic waves has been studied extensively since the half plane problems were investigated by Poincare and Sommerfeld. Such barriers may have absorbing lining on the surfaces and satisfy impedance boundary conditions as well. A barrier should be good attenuator of sound and inexpensive at the same time. Diffraction theory can be applied successfully to reduce the noise due to heavy traffic, environmental pollution and industrial growth by means of barriers in heavily built up areas.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |