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Open research questions in Acoustic Wave Phenomena Research

157 gap statements mined from Acoustic Wave Phenomena Research papers in our 7.9M-paper local library, which holds 2,961 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • The lack of effective sound insulation solutions for lightweight composite materials. The limitation of conventional sound insulation methods that rely on high area density. The need for innovative materials and designs that can provide sound insulation with minimal added weight.

    Analysis of Sound Insulation Performance in Aeronautical Composite Materials and Optimization Study on Film Metamaterials · 2026 · DOI

  • Further research could investigate the effects of other factors such as damping and nonlinearity on the STL properties of double-walled sandwich microplates. The study of other types of microplates and their applications could be explored. Experimental validation of the analytical model could be conducted.

    Size-dependent vibroacoustic behavior of thermally loaded double-walled sandwich microplates with metamaterial honeycomb cores and FGPP facesheets · 2026 · DOI

  • The lack of understanding of size-dependent effects in microscale and nanoscale structures. The need for a thorough examination of the STL properties of double-walled sandwich microplates with metamaterial honeycomb cores and FGPP facesheets under thermal loading conditions.

    Size-dependent vibroacoustic behavior of thermally loaded double-walled sandwich microplates with metamaterial honeycomb cores and FGPP facesheets · 2026 · DOI

  • The need for efficient construction of dynamic models of structures with complex cutout shapes. The lack of understanding of the vibration behavior and energy flow of acoustic black hole porous plates with cutouts. The need for investigation of the effects of different porosity distributions and geometric cutout shapes on the vibration suppression of ABH-PPC.

    Dynamic characteristics and energy flow in porous plates with cutouts incorporating acoustic black holes · 2026 · DOI

  • Earlier treatments of nonlocal metasurfaces did not explicitly integrate distributed inertia, diatomic asymmetry, and long-range elastic links. There is a need for a unified treatment that captures essential dynamic behavior in one-dimensional periodic chains. The existing models do not provide a comprehensive description of wave dynamics in structured media.

    Wave propagation in a nonlocal supercell with lumped and distributed masses · 2026 · DOI

  • The lack of understanding of the bandgap regulation mechanism involving nonlocal effects and multiphysical-field coupling. The absence of effective schemes for collaborative optimization of external field parameters. The need for a deeper understanding of the bandgap characteristics of nanoscale MEE-PC plates.

    Study on bandgap characteristics of nanoscale magneto-electro-elastic phononic crystal plates considering nonlocal effects · 2026 · DOI

  • The need for a spectral element analysis of folded hybrid composite metabeams to study bandgaps and wave tunability. The lack of understanding of the internal architecture of periodic materials and its effect on wave propagation characteristics.

    Bandgaps and wave tunability in folded hybrid composite metabeams: a spectral element analysis · 2026 · DOI

  • The lack of a unified energy functional framework for integrating complex factors. The need for a more accurate and efficient method for predicting vibration responses and acoustic radiation performances. The limited understanding of the effect of core layer material and rib height on vibration and acoustic radiation performances.

    Vibration-acoustic studies of orthogonal rib-stiffened multi-inclusion sandwich plates via a developed analytical method · 2026 · DOI

  • Further studies could investigate the acoustic properties of other historical buildings. Research could focus on the development of new methods and techniques for acoustic measurements.

    Discover the Acoustics of Vanvitelli Architecture in the Royal Palace of Caserta · 2025 · DOI

  • The need to balance the acoustic requirements of traditional Chinese opera with the constraints of modern architectural design.

    Reconsidering Acoustical Design for Traditional Chinese Courtyard Theater in Taiwan · 2025 · DOI

  • There is a lack of systematic quantitative analysis of the acoustic characteristics of ancestral temple theatres. The paper identifies a need for a comprehensive analysis of the spatial elements of these theatres.

    Acoustic Characteristics and Influencing Mechanisms of the Traditional Ancestral Temple Theatre in Northeast Jiangxi · 2025 · DOI

  • Elastic metamaterials have emerged as a promising approach for addressing vibration problems in engineering structures, yet practical devices and automated or optimized design methodologies for their frequency tuning remain insufficiently explored in the literature.

    Layout optimization of the grid-shaped metamaterial-based resonators for frequency tuning · 2025 · DOI

  • Despite significant advances in the field of phononic crystals, the development of acoustic metafluids that replicate the behaviour of liquids in three dimensions remains elusive.

    High bulk modulus pentamodes: the three-dimensional metal water · 2024 · DOI

  • Further work on tailoring the transfer functions is especially needed for realizing specific material properties, as in the reflectionless absorber, where the impressive performance may significantly degrade when the magnitudes and phases of both the monopole and dipole components do not closely match their ideal values.

    Noise Mitigation with Active Acoustic Metamaterials · 2026 · DOI

  • There is a need for environmentally friendly materials to reduce the impact on human health. There is a lack of research on the use of natural fillers in composite materials.

    An Experimental Study on the Effect of Natural Fillers on the Acoustic Isolation of Composite Materials · 2026 · DOI

  • The inverse design of micro-perforated panels for target sound absorption is challenging due to the complex nonlinear relationship between structural parameters and acoustic performance. Prior models have limitations in terms of accuracy and efficiency.

    Inverse engineering of micro-perforated plates for targeted acoustic characteristics · 2026 · DOI

  • Overcoming the operational limits of conventional piezoelectric materials. Developing a fully coupled analysis of prestressed structures that incorporates geometric stiffness effects.

    Design of tunable metamaterials with active piezoelectric patches through advanced 1D models · 2026 · DOI

  • The study aims to investigate the wave-propagation characteristics of functionally graded materials in lattice structures.

    Tunable wave propagation and band gap characteristics in functionally graded lattices with multiple topologies via dynamic stiffness and Floquet–Bloch formulation · 2026 · DOI

  • The construction of the Royal Palace and the urban planning of the city of Caserta remained unfinished after Vanvitelli's death.

    Discover the Acoustics of Vanvitelli Architecture in the Royal Palace of Caserta · 2025 · DOI

  • Traditional HRs are generally limited to attenuating single frequencies, which restricts their ability to attenuate multiple frequencies using a single device.

    Switchable acoustic notch filter using a 3D-printed Helmholtz resonator array with bistable structures · 2025 · DOI

  • The required excitation fields exceed the operational limits of conventional piezoelectric materials, - The study is based on a one-dimensional numerical model, - The model is limited to specific configurations, - The study does not consider other types of materials…

    Design of tunable metamaterials with active piezoelectric patches through advanced 1D models · 2026 · DOI

  • Investigation of phononic crystals involving nanoscale effects and multiphysical-field coupling, - Development of advanced sensing devices using phononic crystals, - Research on vibration and noise reduction using phononic…

    Study on bandgap characteristics of nanoscale magneto-electro-elastic phononic crystal plates considering nonlocal effects · 2026 · DOI

  • Investigating the role of non-slender inner structural designs in 2D periodic materials, - Exploring the wave propagation characteristics in lattice metamaterials and architected structures, - Analyzing the frequency responses of finite folded composite…

    Bandgaps and wave tunability in folded hybrid composite metabeams: a spectral element analysis · 2026 · DOI

  • Investigating the influence of other parameters on the vibration-acoustic behavior of sandwich plates, - Developing more advanced analytical methods for complex structures, - Exploring the application of the present method to other…

    Vibration-acoustic studies of orthogonal rib-stiffened multi-inclusion sandwich plates via a developed analytical method · 2026 · DOI

  • Finally, we summarize the potential applications of acoustic sensing technologies and conclude by highlighting open challenges and promising directions for future investigation in this rapidly evolving domain.

    A survey on acoustic sensing in the metasurface era: Challenges, advances, and applications · 2025 · DOI

Most-cited papers in Acoustic Wave Phenomena Research

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Open questions raised by papers listed on this page include: (1) The lack of effective sound insulation solutions for lightweight composite materials (“Analysis of Sound Insulation Performance in Aeronautical Composite Materials…”, 2026); (2) Further research could investigate the effects of other factors such as damping and nonlinearity on the STL properties of double-walled sandwich microplates (“Size-dependent vibroacoustic behavior of thermally loaded double-walled…”, 2026); (3) The lack of understanding of the vibration behavior and energy flow of acoustic black hole porous plates with cutouts (“Dynamic characteristics and energy flow in porous plates with cutouts…”, 2026); (4) There is a need for a unified treatment that captures essential dynamic behavior in one-dimensional periodic chains (“Wave propagation in a nonlocal supercell with lumped and distributed masses”, 2026); (5) The lack of understanding of the bandgap regulation mechanism involving nonlocal effects and multiphysical-field coupling (“Study on bandgap characteristics of nanoscale magneto-electro-elastic phononic…”, 2026). 157 gap statements have been mined from Acoustic Wave Phenomena Research papers in our 7.9M-paper local library, which holds 2,961 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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