Inertial attached neck length of Helmholtz resonators

Acoustic Characteristics of Noise Absorbing Barriers

“…Also, let us note that if for a frequency of 400 Hz the error increases smoothly with decreasing n, then for a frequency of 800 Hz these changes are more complex, unsystematic in nature, and large errors are also typical for a higher frequency. In general, this conclusion is consistent with the results of [15], where a more accurate partition was used with a maximum finite element size of 0.01 m. It was found that at frequencies above 4000 Hz, the errors in the calculations become higher. The authors explained this result by the fact that, at the boundaries of the considered computational domain, the impedance boundary conditions did not fully correspond to the conditions of the characteristic impedance of air and this became critical at high frequencies.…”

“…Calculation and design of acoustic barriers both in our country and abroad are paid great attention [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Moreover, as a rule, the effectiveness of acoustic barriers is estimated using the Maekawa formula [1][2][3], which is the result of approximating experimental data in which the Fresnel number is the main calculation parameter.…”

“…And although it is very difficult to take these factors into account when calculating by analytical methods, much attention continues to be paid to the development of these methods [4][5][6][7][8][9][10][11][12][13][14]. At the same time, it should be borne in mind that in the near future, numerical methods will become the main tool in calculating acoustic barriers and other areas of applied acoustics [15][16][17][18][19]. According to [15], using finite element modeling, the features of the formation of an acoustic pattern in the vicinity of the barrier located on the underlying surface are studied and the laws of the influence of this surface on the acoustic efficiency of the barrier are analyzed.…”

Locomotive Noise Reduction

“…To determine the required parameters, the noise barrier was modeled using finite element modeling in COMSOL Multiphysics. Such an approach in recent times is increasingly used [7][8][9][10][11]. This modeling method allows presenting a discrete space as a finite set of elementary volumes.…”

Study of the Hershel-Quinke Resonator

“…It should be noted that today numerical methods are increasingly used in in calculating mufflers and other areas of applied acoustics [7][8][9][10][11][12]. To analyze the acoustic characteristics of the Herschel-Quincke pipe, a numerical calculation method based on finite element modeling was applied.…”