Impact of the Soundproofing in the Cavity of the Synthetic Jet Actuator on the Generated Noise

Smyk, Emil; Markowicz, Marek

doi:10.3390/fluids7100323

Cited by 2 publications

(4 citation statements)

References 40 publications

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“…In the Burton-Miller framework, we need the normal derivative of the standard Helmholtz boundary integral equation, as in Equation (5). This equation contains hypersingular integrals and must be treated very carefully.…”

Section: Overviewmentioning

confidence: 99%

“…Assuming now that ψ 1 = φ on the surface S (and only on this surface), subtract Equation (9) from Equation (5), to obtain…”

Section: The Normal Derivative Of the Boundary Integral Equationmentioning

confidence: 99%

“…Understanding acoustic phenomena [1] is of great importance for transitional research and practical applications, ranging from musical instruments [2,3], traffic, or airplane noise prediction [4,5], to sensing and monitoring for structural health [6]. In fluids, acoustic phenomena manifest themselves as the temporal-spatial distribution and evolution of pressure or density waves.…”

Section: Introductionmentioning

confidence: 99%

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Non-Singular Burton–Miller Boundary Element Method for Acoustics

Sun

Klaseboer

2023

Fluids

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The problem of non-unique solutions at fictitious frequencies that can appear in the boundary element method for external acoustic phenomena described by the Helmholtz equation is studied. We propose a method to fully desingularise in an analytical way the otherwise hyper-singular Burton–Miller framework, where the original boundary element method and its normal derivative are combined. The method considerably simplifies the use of higher-order elements, for example, quadratic curved surface elements. The concept is validated using the example of scattering on a rigid sphere and a rigid cube, and its robustness and effectiveness for external sound-wave problems are confirmed.

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Section: Overviewmentioning

confidence: 99%

“…Assuming now that ψ 1 = φ on the surface S (and only on this surface), subtract Equation (9) from Equation (5), to obtain…”

Section: The Normal Derivative Of the Boundary Integral Equationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Non-Singular Burton–Miller Boundary Element Method for Acoustics

Sun

Klaseboer

2023

Fluids

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“…Several studies in the literature were aimed at enhancing the SJA designs by reducing the resulting noise. This was achieved through several methods such as having outof-phase dual-acting orifices [24], introducing phase miss-matching [25], soundproofing the cavity walls [26], or using different orifice shapes [27]. These studies showed very promising results.…”

Section: Introductionmentioning

confidence: 99%

Jet Velocity and Acoustic Excitation Characteristics of a Synthetic Jet Actuator

Arafa

Sullivan

Ekmekci

2022

Fluids

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The effect of the excitation frequency of synthetic jet actuators on the mean jet velocity issuing from an array of circular orifices is investigated experimentally, focusing on the acoustic excitation characteristics of the actuator’s cavity. Two cavity configurations are considered. In the first configuration, synthetic jets are generated by exciting a single, large cavity having an array of sixteen orifices via sixteen piezoelectric elements. In the second configuration, the cavity volume of the first configuration is divided into eight isolated compartments, each with two orifices and two piezoelectric elements. Several distinct resonant peaks were observed in the frequency response of the synthetic jet actuator built with a single large-aspect-ratio cavity, whereas the case of compartmentalised cavities exhibited a single resonant peak. Acoustic simulations of the large-aspect-ratio-cavity volume showed that the multiple peaks in its frequency response correspond to the acoustic standing-wave mode shapes of the cavity. Due to its large aspect ratio, several acoustic mode shapes coexist in the excitation frequency range aside from the Helmholtz resonance frequency. When the actuator’s cavity volume is compartmentalised, only the Helmholtz resonance frequency is observed within the excitation frequency range.

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Impact of the Soundproofing in the Cavity of the Synthetic Jet Actuator on the Generated Noise

Cited by 2 publications

References 40 publications

Non-Singular Burton–Miller Boundary Element Method for Acoustics

Non-Singular Burton–Miller Boundary Element Method for Acoustics

Jet Velocity and Acoustic Excitation Characteristics of a Synthetic Jet Actuator

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