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Acoustics
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Resonators in Acoustics (2nd Edition)
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Resonators in Acoustics (2nd Edition)

A special issue of Acoustics (ISSN 2624-599X).

Deadline for manuscript submissions: closed (31 December 2023) | Viewed by 14084

Special Issue Editor

Dr. Nikolay Kanev

E-Mail Website
Guest Editor
Theoretical Department, Andreyev Acoustics Institute, Moscow 117036, Russia
Interests: helmholtz resonator; low frequency
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Today, resonators are widely used in different fields of acoustics. Although the first mentionof resonant devices can be found in ancient manuscripts, their scientific study began much later with the well-known Helmholtz resonator, which was an effective absorber and scatterer of sound waves. The theory of resonant acoustic phenomena was founded by Helmholtz, Rayleigh, and other scientists, and continues to be developed intensively by researchers and engineers in various fields. Since then, resonators have been successfully applied to architectural acoustics, noise and vibration control, medical applications, measurement technologies, sound radiation, new sensors, and variety of other inventions. 

In recent years, new metamaterials and metastructures with unusual properties have been developed on the basis of using the simplest resonant elements; the theory of resonators has assisted in elaborating new techniques for active sound control. Therefore, resonators remain highly valuable to both fundamental research and engineering investigations.

Taking into account the relevance of this topic and the great interest of many researchers, we devote thisSpecial Issue of the journal Acoustics to resonators in acoustics. The first volume of this Special Issue published 10 interesting papers, with more than 20,000 views. This new volume aims to attract the latest findings concerning the application of resonators in acoustics. New ideas and approaches, theoretical studies, and the technical implementation of resonators in various acoustic fields are within the scope of this Special Issue. Submissions with original results, as well as reviews, are most welcome in this Special Issue.

Dr. Nikolay Kanev
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Acoustics is an international peer-reviewed open access quarterly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • theory of resonators
  • modelling and simulation of acoustic resonators
  • new types of resonators
  • resonant devices in acoustics
  • resonators for noise and vibration control
  • absorption and scattering of sound waves by resonators
  • new application of resonators
  • metamaterials based on resonance phenomena
  • experimental study
  • active resonators
  • resonators in engineering

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Related Special Issue

Published Papers (6 papers)

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Research

14 pages, 1989 KiB  
Article
Acoustic Properties of Surfaces Covered by Multipole Resonators
by Nikolay Kanev
Acoustics 2024, 6(2), 509-522; https://doi.org/10.3390/acoustics6020027 - 25 May 2024
Viewed by 1256
Abstract
Different types of resonators are used to create acoustic metamaterials and metasurfaces. Recent studies focused on the use of multiple resonators of the dipole, quadrupole, octupole, and even hexadecapole types. This paper considers the theory of an acoustic metasurface, which is a flat [...] Read more.
Different types of resonators are used to create acoustic metamaterials and metasurfaces. Recent studies focused on the use of multiple resonators of the dipole, quadrupole, octupole, and even hexadecapole types. This paper considers the theory of an acoustic metasurface, which is a flat surface with a periodic arrangement of multipole resonators. The sound field reflected by the metasurface is determined. If the distance between the resonators is less than half the wavelength of the incident plane wave, the far field can be described by a reflection coefficient that depends on the angle of incidence. This allows us to characterize the acoustic properties of the metasurface by a homogenized boundary condition, which is a high-order tangential impedance boundary condition. The tangential impedance depending on the multipole order of the resonators is introduced. In addition, we analyze the sound absorption properties of these metasurfaces, which are a critical factor in determining their performance. The paper presents a theoretical model for the subwavelength case that accounts for the multipole orders of resonators and their impact on sound absorption. The maximum absorption coefficient for a diffuse sound field, as well as the optimal value for the homogenized impedance, are calculated for arbitrary multipole orders. The examples of the multipole resonators, which can be made from a set of Helmholtz resonators or membrane resonators, are discussed as well. Full article
(This article belongs to the Special Issue Resonators in Acoustics (2nd Edition))
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17 pages, 5223 KiB  
Article
Influence of the Gain–Bandwidth of the Front-End Amplifier on the Performance of a QEPAS Sensor
by Luigi Lombardi, Gianvito Matarrese and Cristoforo Marzocca
Acoustics 2024, 6(1), 240-256; https://doi.org/10.3390/acoustics6010013 - 6 Mar 2024
Viewed by 1732
Abstract
The quartz tuning fork used as an acoustic sensor in quartz-enhanced photo-acoustic spectroscopy gas detection systems is usually read out by means of a transimpedance preamplifier based on a low-noise operational amplifier closed in a feedback loop. The gain–bandwidth product of the operational [...] Read more.
The quartz tuning fork used as an acoustic sensor in quartz-enhanced photo-acoustic spectroscopy gas detection systems is usually read out by means of a transimpedance preamplifier based on a low-noise operational amplifier closed in a feedback loop. The gain–bandwidth product of the operational amplifier used in the circuit is a key parameter which must be properly chosen to guarantee that the circuit works as expected. Here, we demonstrate that if the value of this parameter is not sufficiently large, the response of the preamplifier exhibits a peak at a frequency which does not coincide with the series resonant frequency of the quartz tuning fork. If this peak frequency is selected for modulating the laser bias current and is also used as the reference frequency of the lock-in amplifier, a penalty results in terms of signal-to-noise ratio at the output of the QEPAS sensor. This worsens the performance of the gas sensing system in terms of ultimate detection limits. We show that this happens when the front-end preamplifier of the quartz tuning fork is based on some amplifier models that are typically used for such application, both when the integration time of the lock-in amplifier filter is long, to boost noise rejection, and when it is short, in order to comply with a relevant measurement rate. Full article
(This article belongs to the Special Issue Resonators in Acoustics (2nd Edition))
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17 pages, 14043 KiB  
Article
Investigations into the Approaches of Computational Fluid Dynamics for Flow-Excited Resonator Helmholtz Modeling within Verification on a Laboratory Benchmark
by Daniil Sergeev, Irina V’yushkina, Vladimir Eremeev, Andrei Stulenkov and Kirill Pyalov
Acoustics 2024, 6(1), 18-34; https://doi.org/10.3390/acoustics6010002 - 22 Dec 2023
Cited by 1 | Viewed by 2211
Abstract
This paper presents the results of a study of self-sustained processes excited in a Helmholtz resonator after a flow over its orifice. A comparative analysis of various approaches to the numerical modeling of this problem was carried out, taking into account both the [...] Read more.
This paper presents the results of a study of self-sustained processes excited in a Helmholtz resonator after a flow over its orifice. A comparative analysis of various approaches to the numerical modeling of this problem was carried out, taking into account both the requirements for achieving the required accuracy and taking into account the resource greediness of calculations, the results of which were verified by comparison with data obtained during a special experiment. The configuration with a spherical resonator with a natural frequency of 260 Hz and an orifice diameter (about 5 cm) in an air flow with a speed of 6 to 14 m/s was considered. A comparison of the calculation results with data obtained in experiments carried out in the wind tunnel demonstrated that the accuracy of calculations of the characteristics of the self-sustained mode using the simplest URANS class model tends to the accuracy of calculations within the large eddy simulation approach formulated in the WMLES model. At the same time, when using WMLES, it is possible to better reproduce the background level of pulsations. From the point of view of resource greediness, expressed in the number of core hours spent obtaining a solution, both models of the turbulence turned out to be almost equivalent when using the same grid models. Full article
(This article belongs to the Special Issue Resonators in Acoustics (2nd Edition))
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13 pages, 2967 KiB  
Article
Low-Frequency-Noise Attenuation through Extended-Neck Double-Degree-of-Freedom Helmholtz Resonators
by Abhishek Gautam, Alper Celik and Mahdi Azarpeyvand
Acoustics 2023, 5(4), 1123-1135; https://doi.org/10.3390/acoustics5040063 - 3 Dec 2023
Viewed by 2750
Abstract
The use of acoustic liners, based on double-degree-of-freedom Helmholtz resonators, for low-frequency-noise attenuation is limited by the volume of individual resonating cavities. This study investigates the effect of the septum neck length on the acoustic performance of double-degree-of-freedom resonators, both experimentally and numerically, [...] Read more.
The use of acoustic liners, based on double-degree-of-freedom Helmholtz resonators, for low-frequency-noise attenuation is limited by the volume of individual resonating cavities. This study investigates the effect of the septum neck length on the acoustic performance of double-degree-of-freedom resonators, both experimentally and numerically, for varying cavity volume ratios. The underlying sound attenuation mechanism is studied by analysing the acoustic pressure fields within the resonator cavities. An increase in the septum neck is shown to lower the frequencies affected by the resonator. In addition, it deteriorates and significantly improves the sound attenuation performance at the primary and secondary peak transmission-loss frequencies, respectively. Full article
(This article belongs to the Special Issue Resonators in Acoustics (2nd Edition))
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18 pages, 4773 KiB  
Article
An Acoustoelectric Approach to Neuron Function
by Jörg P. Kotthaus
Acoustics 2023, 5(3), 601-618; https://doi.org/10.3390/acoustics5030037 - 22 Jun 2023
Viewed by 2842
Abstract
An acoustoelectric approach to neuron function is proposed that combines aspects of the widely accepted electrical-circuit-based Hodgkin–Huxley model for the generation and propagation of action potentials via electric polarization with mechanical models based on propagation via capillary waves. Explaining measured velocities of action [...] Read more.
An acoustoelectric approach to neuron function is proposed that combines aspects of the widely accepted electrical-circuit-based Hodgkin–Huxley model for the generation and propagation of action potentials via electric polarization with mechanical models based on propagation via capillary waves. Explaining measured velocities of action potentials quantitatively, it also predicts the electrical tunability of highly anisotropic polarization packages that surf on the dynamic mechanical force field deforming the neuron membrane. It relies substantially on the local motion of dipoles formed by excess charges close to the inside surface of the neuron membrane, which in turn are anisotropically screened by water molecules in their hydration shell, thus modulating the strong electric field at the interface. As demonstrated on acoustic resonators of suspended nanowires fabricated out of amorphous dipolar silicon nitride, high electric fields combined with predominantly axial-strain modulation can cause transverse acoustoelectric polarization waves that propagate soliton-like with extremely low loss. In neurons, the modulation of electric polarization is confined in the nanometer-thin skin of a high electric field inside the neuron membrane and propagates phase-coherent along the axon as a lowest-order one-dimensional breathing mode, similar to transverse polarization pulses studied in nanowire resonators. Some experiments for the further manifestation of the model as well as topological protection of such breathing-mode polarization waves are discussed. Full article
(This article belongs to the Special Issue Resonators in Acoustics (2nd Edition))
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18 pages, 4785 KiB  
Article
IIR Cascaded-Resonator-Based Complex Filter Banks
by Miodrag D. Kušljević, Vladimir V. Vujičić, Josif J. Tomić and Predrag D. Poljak
Acoustics 2023, 5(2), 535-552; https://doi.org/10.3390/acoustics5020032 - 30 May 2023
Cited by 1 | Viewed by 2091
Abstract
The use of a filter bank of IIR filters for the spectral decomposition and analysis of signals has been popular for many years. As such, a new filter-bank resonator-based structure, representing an extremely hardware-efficient structure, has received a good deal of attention. Recently, [...] Read more.
The use of a filter bank of IIR filters for the spectral decomposition and analysis of signals has been popular for many years. As such, a new filter-bank resonator-based structure, representing an extremely hardware-efficient structure, has received a good deal of attention. Recently, multiple-resonator (MR)-based and general cascaded-resonator (CR)-based filters have been proposed. In comparison to single-resonator-based analyzers, analyzers with a higher multiplicity of resonators in the cascade provide lower side lobes and a higher attenuation in stopbands. In previous works, it was shown that the CR-based filter bank with infinite impulse response (IIR) filters, which is numerically more efficient than one with finite impulse response (FIR) filters, is suitable for dynamic harmonic analysis. This paper uses the same approach to design complex digital filter banks. In the previous case, the optimization task referred to the frequency responses of harmonic filters. In this work, the harmonic filters of the mother filter bank are reshaped so that the frequency response of the sum (or difference, depending on the parity of the number of resonators in the cascade) of two adjacent harmonic filters is optimized. This way, an online adaptive filter base can be obtained. The bandwidth of the filters in the designed filter bank can be simply changed online by adding or omitting the output signals of the corresponding harmonics of the mother filter. Full article
(This article belongs to the Special Issue Resonators in Acoustics (2nd Edition))
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