4/23/2024 0 Comments Sound diffraction around a barrierThe validity of the proposed method is verified by comparing the theoretical results. The method combines the classic imaging method for an analysis of sound propagation with the secondary source model for diffraction by barriers in the time domain, which is different from other frequency-domain methods. Predictions based on DLSM compare favorably with experimental data. This paper presents a method for calculating the insertion loss of barriers on the ground. The simulation results showed that the noise reduction. In this paper, the integral equation method was used to calculate the sound field of a barrier with various top edge impedance, and the effects of the barrier top edge impedance on sound barrier diffraction were investigated. Results for plane, cylindrical and spherical incident waves, as well as for arrays of line and point sources, are presented and their agreement with known analytical solutions is demonstrated. Sound barriers can be configured with different top edge impedance to improve their noise control performance. Finally, DLSM can handle diffraction by an arbitrarily shaped edge profile, for example, a half plane having an edge that is jagged instead of straight. It can be applied for several types of incident radiation: omnidirectional cylindrical and spherical waves, plane waves, as well as waves from directional sources. Based on the geometrical theory of diffraction and extended from the exact boundary solution for a rigid wedge, the proposed method is able to determine the multiple diffraction along arbitrary directions or at arbitrary receiver locations around the diffracting edges, including the positions along the shadow or reflection boundaries or very. Because DLSM is fast, simple and intuitive, it is a promising tool for the study of diffraction. Diffraction of sound around corners and over wide barriers. This phenomenon is particularly important, when the noise barriers are used for creation of an acoustic shadow area behind the barrier. The height of the sound barriers is set to 1 m and they are positioned at (1 m, 0 m) and (1 m, 0 m), respectively the sound source is positioned at (0 m. Acoustic wave, when encountering the edge of an obstacle located in its path, is subject to diffraction (bending, deflection). In the new method the edge of the half plane is modeled as an infinite set of directive point sources continuously distributed along the edge. Diffraction is the capacity of sound waves to bend at the edge of a barrier. A new method termed Directive Line Source Model (DLSM) is presented for predicting the diffracted field produced by a sound wave incident on a rigid or pressure release half plane.
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