Theory and applications of quarter-wave resonators: A prelude to their use for attenuating noise entering buildings through ventilation openings

Field, Clarice; Fricke, Fergus R.

doi:10.1016/s0003-682x(97)00035-2

Cited by 62 publications

(39 citation statements)

References 6 publications

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“…As shown in figure 1(a), an open-closed acoustic duct is simply a pipe or tube with open inlet and closed end. The rigid boundaries of the tube confine air within the resonator cavity [12]. The one-dimensional (1D) Helmholtz equation is…”

Section: Theoretical Analysis Of Eigenfrequency Shift In Open-closed mentioning

confidence: 99%

“…In our previous studies [4][5], the loading resistance R opt is used to match the impedance with the piezoelectric element to ensure a maximization of the harvesting efficiency, (12) where C p is the piezoelectric capacitance, ζ is the damping ratio, k p is the piezoelectric coupling coefficient, ω n is the angular frequency. Thus, the total output power of n piezoelectric plates can be calculated as…”

Section: Output Power Of the Acoustic Energy Harvester When Placing Mmentioning

confidence: 99%

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Enhanced output power by eigenfrequency shift in acoustic energy harvester

You

2014

SPIE Proceedings

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In our previous studies, multiple piezoelectric cantilever plates were placed inside a quarter-wavelength straight tube resonator to harvest low frequency acoustic energy. To investigate the modification of eigenmodes in the tube resonator due to the presence of piezoelectric plates, the eigenfrequency shift properties by introducing single and multiple rectangular blockages in open-closed ducts are studied by using 1D segmented Helmholtz equations, Webster horn equation, and finite element simulations. The first-mode eigenfrequency of the duct is reduced when the blockage is placed near the open inlet. The decrease of eigenfrequency leads to the enhancement of absorbed acoustic power in the duct. Furthermore, the first half of the tube resonator possesses high pressure gradient resulting in larger driving forces for the vibration motion of piezoelectric plates. Therefore, in our harvesters, it is better to place the piezoelectric plates in the first half of the tube resonator to obtain high output voltage and power.

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Section: Theoretical Analysis Of Eigenfrequency Shift In Open-closed mentioning

confidence: 99%

Section: Output Power Of the Acoustic Energy Harvester When Placing Mmentioning

confidence: 99%

Enhanced output power by eigenfrequency shift in acoustic energy harvester

You

2014

SPIE Proceedings

View full text Add to dashboard Cite

show abstract

“…where S 5 denotes the cross section of cavity V 5 . v i l and v r l (here l ¼ 5) are the normal velocities in positive and negative x directions in the lth cavity, respectively, and they can be derived from Eq.…”

Section: B Primary Sound Fieldmentioning

confidence: 99%

Active noise attenuation in ventilation windows

Huang

Qiu

Kang

2011

The Journal of the Acoustical Society of America

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The feasibility of applying active noise control techniques to attenuate low frequency noise transmission through a natural ventilation window into a room is investigated analytically and experimentally. The window system is constructed by staggering the opening sashes of a spaced double glazing window to allow ventilation and natural light. An analytical model based on the modal expansion method is developed to calculate the low frequency sound field inside the window and the room and to be used in the active noise control simulations. The effectiveness of the proposed analytical model is validated by using the finite element method. The performance of the active control system for a window with different source and receiver configurations are compared, and it is found that the numerical and experimental results are in good agreement and the best result is achieved when the secondary sources are placed in the center at the bottom of the staggered window. The extra attenuation at the observation points in the optimized window system is almost equivalent to the noise reduction at the error sensor and the frequency range of effective control is up to 390 Hz in the case of a single channel active noise control system.

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“…10 It is assumed that the walls and the closed end of the channels shown in Fig. 1 are rigid and they are sufficiently wide for viscous and thermal conduction effects to be negligible.…”

Section: A Quarter-wave Resonatorsmentioning

confidence: 99%

A laboratory investigation of noise reduction by riblike structures on the ground

Bougdah

Ekici

Kang

2006

The Journal of the Acoustical Society of America

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This paper investigates the use of periodically spaced edges or wells for the control of road traffic noise. The wells have uniform height and width and are placed on the ground. Physical scale modeling is used to assess the acoustic performance of these structures under laboratory conditions. It is shown that, in certain situations where the use of conventional barriers would not be appropriate, strategically designed riblike structures can provide insertion losses of typically 10-15 dB. The findings are explained in terms of acoustic scattering with the approaches used in the study of resonators and diffraction/interference gratings.

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Theory and applications of quarter-wave resonators: A prelude to their use for attenuating noise entering buildings through ventilation openings

Cited by 62 publications

References 6 publications

Enhanced output power by eigenfrequency shift in acoustic energy harvester

Enhanced output power by eigenfrequency shift in acoustic energy harvester

Active noise attenuation in ventilation windows

A laboratory investigation of noise reduction by riblike structures on the ground

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