Open AccessInfluence of the geometry fidelity of resonant sound-absorbing liner samples on their acoustic characteristics
Author(s) -
Oleg Kustov,
И. В. Храмцов,
Roman Bulbovich
Publication year - 2019
Publication title -
vestnik samarskogo universiteta. aèrokosmičeskaâ tehnika, tehnologii i mašinostroenie
Language(s) - English
Resource type - Journals
eISSN - 2541-7533
pISSN - 2542-0453
DOI - 10.18287/2541-7533-2019-18-1-67-77
Subject(s) - acoustics , helmholtz resonator , noise reduction coefficient , acoustic impedance , materials science , resonator , compressibility , basis (linear algebra) , absorption (acoustics) , electrical impedance , vibration , sound pressure , helmholtz free energy , optics , geometry , mathematics , physics , mechanics , porosity , quantum mechanics , composite material , ultrasonic sensor
Samples of sound-absorbing Helmholtz resonator-type liners of circular shape were manufactured from two types of ABS plastic and nylon on the basis of 3D modeling and 3D printing technology. Check samples were made of metal on a numerically controlled machine. Deviations of geometric parameters of the manufactured samples from the design values were determined by visual and dimensional inspection using high-precision equipment. The minimum deviations were obtained for check samples made of metal. The acoustic characteristics of the samples were experimentally determined using an interferometer with normal wave incidence at high sound pressure levels. Numerical simulation of the acoustic processes in the interferometer for the given samples was carried out on the basis of solving full Navier-Stokes equations with account for compressibility. The obtained values of the resonant frequency, impedance and sound absorption coefficient were compared with the experimental ones. It was noted that the impedance values are most sensitive to the deviations of the geometric parameters of the samples from the design values, while the deviations in the sound absorption coefficient and resonance frequency are not so sensitive to them.