Abstract
Local resonant sonic crystals (LRSCs) window as a novel design has recently been proposed to achieve a good balance between noise mitigation, natural ventilation and natural lighting. In an effort to explore the feasibilities of such designs in civil residential buildings, an optimization methodology was proposed to develop a more compact LRSCs window with high noise attenuation performance in the present study. Specifically, the Taguchi method was adopted for the design of experiments on the parameters of interest and their corresponding levels, and SN ratio analysis was then applied for the parametric evaluations on the noise attenuation on specified frequencies in traffic noise (concentrated sound energy frequency range: 630–1000 Hz). Three optimal sets of design parameters on the interested frequencies, namely, 630 Hz, 800 Hz and 1000 Hz were obtained. ANOVA analysis was conducted to quantificationally identify the design parameters with statistical significance and remarkable contribution to the desired performance. Results indicate that the slit size has the most significant influence on the overall noise attenuation performance, followed by cavity width. An optimal set of design parameters to achieve the overall best noise reduction performance in the frequency range of 630–1000 Hz was finally determined by combining the SN ratio and ANOVA analysis. A prototype of the final optimized LRSCs window was then fabricated and tested in a semi-anechoic chamber. Good agreement was found between the experiment and numerical simulation. In comparison to the benchmark case, the final optimized design can achieve a further noise reduction by 2.84 dBA, 3.48 dBA and 5.56 dBA for the frequencies of 630 Hz, 800 Hz and 1000 Hz, respectively. The overall noise reduction for the interested frequency range can be promoted by 3.28 dBA. The results indicate that the proposed optimization methodology is practical and efficient in designing a high-performance LRSCs window or improving similar applications.
Highlights
With the acceleration of urbanization, noise pollution has become the main source of urban environmental pollution
Sonic crystals (SCs) have been widely applied in the designs of noise barriers and green belts that can be used in railway, expressway and some other public areas with noise pollution concerns [8,9,10,11,12]
The results indicated that the presence of Helmholtz resonators was apt to generate a band gap at a low frequency
Summary
With the acceleration of urbanization, noise pollution has become the main source of urban environmental pollution. The concept of local resonant sonic crystals (LRSCs) which have resonance characteristics has been proposed to reduce the lower frequency noise and broaden the band gaps with smaller SCs structures. Wang et al [21] through theoretical and experimental methods studied the band structure and acoustic localization capability of a two-dimensional phononic crystal resonator (PCR) with slit design. In order to reduce the overall thickness of the SCs window while maintaining or even enhancing the noise attenuation performance, the present study aims to propose an optimization methodology for the parametric designs of high-performance LRSCs window with less column of Helmholtz resonators and thinner window thickness. On the basis of the concept of our previous studies [27,28,29], the specific goal is to develop a high-performance LRSCs window with only three columns of Helmholtz resonators installed within a limited window thickness of 220 mm
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