Time-domain numerical computation of noise reduction by diffraction and finite impedance of barriers

Review of New City Viaduct Noise Barrier

“…Many foreign scholars have done a lot of research on the sound barrier, including barrier rear sound field distribution, noise prediction model, the noise barrier insertion loss calculation, the noise barrier structure design, structure improvement, sound barrier in landscape design. Study on the noise barrier mainly by using boundary element method, numerical simulation, scale model method from theory, according to the acoustic characteristic and geometry characteristic analysis of sound barrier of insertion loss of noise barriers [1][2][3], sound wave propagation in recent years, optimization design method also has a lot of application of in design of sound barriers [4].…”

Time- and frequency-domain computations of broadband noise due to interaction between incident turbulence and rectilinear cascade of flat plates

“…Therefore, the artificial selective damping terms [31] are applied to the discretized equations so that the spurious waves are effectively removed. Note that these CAA techniques have been applied and validated through their various applications [35][36][37][38][39]. In the following section, we will discuss how to produce the ingested turbulent gust in the time-domain computation, which is an essential part of extending the time-domain CAA code for the tonal noise to that for the broadband noise.…”

Performance of Traffic Noise Barriers with Varying Cross-Section

“…In practical design, infinite impedance of a barrier surface relates to using acoustically very reflective materials such as reinforced concrete. Lim et al [12] considered in detail the differences in barrier efficiency related to acoustic impedance of materials used to construct the top diffusers.…”