auctionfoki.blogg.se

Angle of incidence equaling an angle of reflection
Angle of incidence equaling an angle of reflection







angle of incidence equaling an angle of reflection

Dalenbäck, “ Room acoustic prediction based on a unified treatment of diffuse and specular reflection,” J. Naylor, “ ODEON-Another hybrid room acoustical model,” Appl. Bartsch, “ Simulation der tieffrequenten Schallausbreitung in Räumen, Zwischenbericht über das Forshungsverhaben, DFG VO 600/3-1,” ITA, RWTH Aachen (1998). Patzold, “ Comparison between room transmission functions calculated with a boundary-element method and a ray-tracing method including phase,” Proceedings of Inter-Noise’96, pp.3177– 3180. Tachibana, “ Calculation of impulse responses in 3-D sound field with absorptive boundary by the finite-difference method,” Proceedings of Inter-Noise ’97, p.1597. Haddar, “ A sub-domain decomposition method for large acoustic cavities,” Proceedings of Inter-Noise’96, pp. Sekine, “ A numerical analysis of sound field of a long space by a sub-region coupling approach,” Proceedings of Inter-Noise’96, pp. Craggs, “ On further validation and use of the finite element method to room acoustics,” J. van Vooren, “ Acoustical and elasto-acoustic analysis using finite element and boundary element methods,” Sound Vib. Vorländer, “ Simulation of the transient and steady-state sound propagation in rooms using a new combined ray-tracing/image-source algorithm,” J. van Maercke, “ Simulation of sound fields in time and frequency domain using a geometrical model,” Proceedings of the 12th ICA, Toronto, 1986, E11– 7. Ngan, “ A beam tracing method for interactive architectural acoustics,” J. Lam, “ The adaptive beam-tracing algorithm,” J. Farina, “ RAMSETE-A new pyramid tracer for medium and large scale acoustic problems,” Proceedings of Euro-Noise’95, pp. Martin, “ The prediction of echograms and impulse responses within the Epidaure software,” Appl. Kulowski, “ Algorithmic representation of the ray tracing technique,” Appl. Ashdown, “ Improved algorithms and methods for room sound-field prediction by acoustic radiosity in arbitrary polyhedra,” J. Lewers, “ A combined beam-tracing and radiant-exchange computer model of room acoustics,” Appl. Borish, “ Extension of the image model to arbitrary polyhedra,” J. Berkley, “ Image method for efficiently simulating small-room acoustics,” J. Hodgson, “ When is diffuse-field theory applicable,” Appl.

angle of incidence equaling an angle of reflection

The model will be used to study sound fields in rooms with local- or extended-reaction multilayer surfaces. Beam-tracing predictions were compared with those by a method-of-images model with phase. The number of beams, the reflection order, and the frequency resolution required to obtain accurate results were investigated. The beam-tracing model was validated in the cases of three idealized room configurations-a small office, a corridor, and a small industrial workroom-with simple boundary conditions. The test surfaces were a glass plate, double drywall panels, double steel panels, a carpeted floor, and a suspended-acoustical ceiling. The transfer-matrix model was validated by comparing predictions with those by theory, and with experiment. The new model consisted of the transfer-matrix model integrated into the beam-tracing algorithm. Biot theory was used in the transfer-matrix formulation of the porous layer. Room surfaces were modeled as multilayers of fluid, solid, or porous materials. A triangular beam-tracing model with phase, and a transfer-matrix approach to model the surfaces, were involved. This paper presents the development of a wave-based room-prediction model for predicting steady-state sound fields in empty rooms with specularly reflecting, multilayer surfaces.









Angle of incidence equaling an angle of reflection