Analyses of Acoustic Properties of Ventilation Ducts

Abstract

Today, the interest in conducting acoustic tests in nondescript cells is increasing worldwide. Leading developers and manufacturers with the help of the latest technical solutions achieved a reduction in the cost of developing, manufacturing and assembly of acoustic cameras, increasing the life of materials compared to previous cameras.In the field of measuring acoustic parameters, there are two types of specialized international standards for calculating sound pressure levels in laboratory conditions: precise method and engineering (calculation) methods.These standards differ in approaches to testing, including the provision of loopholes for acoustic tests, and are an integral part of a series of standards that establish methods for determining the levels of sound pressure (SPL) for different types of equipment and require the provision of a free field or free field with a flat reflective medium . At the moment, there are two basic standardized requirements for the acoustic environment: the permissible error of the created free field sound (FFA) and background noise (BN), but modern design requires the use of advanced technologies.One such technology is the 3d visualization of the results of acoustic calculations. The COMSOL Multiphysics program allows you to solve a wide range of noise problems using the finite element method used in the program and acts as a world standard for the design of high-performance ventilation systems in Europe and the United States.In this paper a virtual model of the noise-absorbing ventilation duct is designed and the parameters of a sound-damaged camera are designed using the main provisions and methods of engineering calculations in the medium of COMSOL Multiphysics, as well as international and state standards. Showing the following benefits of COMSOL Multiphysics: high accuracy of calculations; reduce the complexity of the calculations; the ability to detect critical areas and develop anti-noise measures.The proposed method of high-precision designing of the effective noise abatement ventilation channel will allow to carry out measurements taking into account the provisions of international standards and enter the European market.The results of the work can be used at enterprises and in construction organizations to design sound-absorbing ventilation ducts according to world standards.Ref. 18, fig. 2., tabl. 2.