Abstract
With the rapid increase in automobiles, the importance of reducing low-frequency noise is being emphasized for a comfortable urban environment. Helmholtz resonators are widely used to attenuate low-frequency noise over a narrow range. In this study, a slit-type soundproof panel is designed to achieve low-frequency noise attenuation in the range of 500 Hz to 1000 Hz with the characteristics of a Helmholtz resonator and the ability to pass air through the slits on the panel surface for reducing wind load. The basic dimension of the soundproof panel is determined using the classical formula and numerical analysis using a commercial program, COMSOL Multiphysics, for transmission loss prediction. From the numerical study, it is identified that the transmission loss performance is improved compared to the basic design according to the shape change and configuration method of the Helmholtz resonator. Although the correlation according to the shape change and configuration method cannot be derived, it is confirmed that it can be used as an effective method for deriving a soundproof panel design that satisfies the basic performance.
Highlights
The Helmholtz resonator (HR) is widely used to passively control noise due to its characteristics of high transmission loss at a low frequency and its structural simplicity in construction
Numerical simulations are conducted using COMSOL Multiphysics, which has been proved reliable in various acoustic simulations in fluids and solids [15,16]
A unit cell for a soundproof panel is conceived from the classical formula and its transmission loss is predicted using COMSOL Multiphysics
Summary
The Helmholtz resonator (HR) is widely used to passively control noise due to its characteristics of high transmission loss at a low frequency and its structural simplicity in construction. Typical applications of the HR include ducts for air conditioning and ventilation in buildings, automotive exhaust systems, and aero-engines to attenuate noise arising from unavoidable elements. The resonance frequency is determined by the geometry of the structure of the cavity and the neck. It is crucial to determine the resonance frequency precisely to achieve an accurate design, which will present the required attenuation capability. There have been discrepancies between theory and measured resonance frequencies. Many studies have been conducted to achieve a better solution for minimizing discrepancies
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