Acoustic performance of balconies having inhomogeneous ceiling surfaces on a roadside building facade

Wang, X.; Mao, Dongxing; Yu, Weiwei; Jiang, Zaixiu

doi:10.1016/j.buildenv.2015.06.027

Cited by 31 publications

(27 citation statements)

References 20 publications

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“…Consequently, to achieve a RB working at low frequencies or with high phase gradient usually leads to an impractical thickness, which limits its application in practice. [4][5][6][7] Nonetheless, observation of the normal specific impedance of a RB, Z ¼ Àjqccotðkl n Þ, suggest that it is quite possible to compress the boundary thickness by making use the periodicity of its cotangent function. Therefore, by making truncations on the tube length at every kl n ¼ p, the thickness of an inhomogeneous boundary can be compressed to…”

Section: Acoustic Artificial Boundaries With Finite Thicknessmentioning

confidence: 99%

“…1,3 Such an inhomogeneous boundary provides great flexibility in engineering the way the sound behaves as it reflects on the boundary, and hence has many potential applications. [4][5][6][7] For example, when barriers are placed on opposite sides of a noise source, their performance deteriorates markedly; 8 however, this drawback can be significantly eliminated by the implementation of inhomogeneous boundaries on the barrier surfaces. 5 In addition, for a road-side building, the screening effect of a balcony was found to be cancelled due to the reflection from its ceiling; 9 in comparison, ceilings having inhomogeneous boundaries effectively guide the sound energy flux away from the building facade.…”

Section: Introductionmentioning

confidence: 99%

“…5 In addition, for a road-side building, the screening effect of a balcony was found to be cancelled due to the reflection from its ceiling; 9 in comparison, ceilings having inhomogeneous boundaries effectively guide the sound energy flux away from the building facade. 6 In this paper, such inhomogeneous boundaries are systematically discussed. In Sec.…”

Section: Introductionmentioning

confidence: 99%

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Acoustic performance of boundaries having constant phase gradient

Wang

et al. 2016

The Journal of the Acoustical Society of America

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In this paper, inhomogeneous boundaries having constant phase gradient are investigated. In principle, such a theoretically proposed boundary is dispersionless. In practice, however, when the boundary is realized by a subwavelength-structured tubes array, the impedance discretization brings about sub-reflections at high frequencies. Moreover, determined by the longest duct in the array, a realized boundary is impractically thick. Therefore, a finite-thickness boundary is further proposed by truncating and periodizing the tubes in the array. In this paper, the theoretical analysis agrees well with the numerical simulations. By appropriately choosing its phase gradient and target frequency, the finite-thickness boundaries have potential applications in noise control.

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Section: Acoustic Artificial Boundaries With Finite Thicknessmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Acoustic performance of boundaries having constant phase gradient

Wang

et al. 2016

The Journal of the Acoustical Society of America

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“…To further enhance the prediction accuracy, high order should be considered in the approximation of the cotangent term of Eq. (8). Furthermore, if compared with the resonator array in Ref.…”

Section: Identical Tubesmentioning

confidence: 99%

“…7 The noise shielding effect of a balcony is improved by inhomogeneous surface impedance composed of a sub-wavelength periodic structured array. 8 In this study, a side-branch tube array with periodic arrangement is investigated. As known, a narrow tube with its mouth flush-mounted along the duct wall performs similarly to that of the Helmholtz resonator when it resonates, as there is a sharp peak at each resonant frequency.…”

Section: Introductionmentioning

confidence: 99%

Sound transmission in a duct with a side-branch tube array mounted periodically

Wang

Zhu

Zhou

2016

The Journal of the Acoustical Society of America

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This paper presents a theoretical study of sound propagation in a duct with a tube array flush-mounted periodically. The underlying wave interaction is analyzed by the transfer matrix method, and validated by the numerical simulation. With identical tubes, a particular situation is observed that the periodic distance and the tube length are “matched,” leading to a strong coupling effect by Bragg reflection and tube resonance, resulting in a wide stopband in low frequency. Even when the tubes in the array are not identical, the Bragg reflection can still work to broaden the stopband which was originally contributed by tube resonances.

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Assessment and mapping of noise pollution in recreation spaces using geostatistic method after COVID-19 lockdown in Turkey

Olgun,

Karakuş,

Selim

et al. 2024

Environ Sci Pollut Res

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Increased use of recreational areas after the lifting of COVID-19 pandemic restrictions has led to increased noise levels. This study aims to determine the level of noise pollution experienced in recreational areas with the increasing domestic and international tourism activities after the lifting of pandemic lockdowns, to produce spatial distribution maps of noise pollution, and to develop strategic planning suggestions for reducing noise pollution in line with the results obtained. Antalya-Konyaaltı Beach Recreation Area, the most important international tourism destination of Turkey, is determined as the study area. To determine the existing noise pollution, 31 measurement points were marked at 100 m intervals within the study area. Noise measurements were taken during the daytime (07:00–19:00), evening (19:00–23:00), and nighttime (23:00–07:00) on weekdays (Monday, Wednesday, Friday) and weekends (Sunday) over 2 months in the summer when the lockdown was lifted. In addition, the sound level at each measurement point was recorded for 15 min, while the number of vehicles passing through the area during the same period was determined. The database created as a result of measurements and observations was analyzed using statistical and geostatistical methods. After the analysis of the data, it was found that the co-kriging-stable model showed superior performance in noise mapping. Additionally, it was revealed that there is a high correlation between traffic density and noise intensity, with the highest equivalent noise level (Leq) on weekdays and weekend evenings due to traffic and user density. In conclusion, regions exposed to intense noise pollution were identified and strategic planning recommendations were developed to prevent/reduce noise sources in these identified regions.

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Acoustic performance of balconies having inhomogeneous ceiling surfaces on a roadside building facade

Cited by 31 publications

References 20 publications

Acoustic performance of boundaries having constant phase gradient

Acoustic performance of boundaries having constant phase gradient

Sound transmission in a duct with a side-branch tube array mounted periodically

Assessment and mapping of noise pollution in recreation spaces using geostatistic method after COVID-19 lockdown in Turkey

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