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Open research questions in Acoustic Wave Phenomena Research

79 unresolved questions extracted from the limitations and future-work sections of 578 Acoustic Wave Phenomena Research papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • Dissipative effects, such as material damping and viscous losses in the liquid PCM, are intentionally neglected. The study is based on a numerical model and does not include experimental validation. The analysis is limited to a 1D waveguide metastructure.

    A Numerical Study of Tunable Multifunctional Metastructures via Solid–Liquid Phase Transition for Simultaneous Control of Sound and Vibration · 2026 · DOI

  • Experimental validation of the proposed metastructure is needed. Further studies on the optimization of the meta-atom design and the PCM properties are required. Investigation of the metastructure's performance in different environments and operating conditions.

    A Numerical Study of Tunable Multifunctional Metastructures via Solid–Liquid Phase Transition for Simultaneous Control of Sound and Vibration · 2026 · DOI

  • The research of active structures has been slow due to issues such as stability and limited bandwidth. The complexity of the control strategy and the need for real-time programming.

    Noise Mitigation with Active Acoustic Metamaterials · 2026 · DOI

  • The exploration of other applications that require very fast time modulation of material parameters. The development of more complex active metamaterial architectures. The investigation of the scalability and stability of the unit cells in various environments.

    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 complex nonlinear relationship between structural parameters and acoustic performance. The difficulty in achieving high accuracy in predicting acoustic behavior. The need for efficient and accurate methods for inverse designing micro-perforated panels.

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

  • The study only investigated a limited range of design parameters. The study only used a specific type of material (ASA) and a specific 3D printing technique (FFF). The study did not investigate the long-term durability of the 3D-printed samples.

    Improving Sound Absorption Properties Using 3D-Printed ASA Concentric Tubular Structures with Intermediate Lattice Inserts · 2026 · DOI

  • Investigating the effect of other design parameters on sound absorption performance. Exploring the use of other materials and 3D printing techniques for sound absorption applications. Investigating the long-term durability of 3D-printed sound absorption structures.

    Improving Sound Absorption Properties Using 3D-Printed ASA Concentric Tubular Structures with Intermediate Lattice Inserts · 2026 · DOI

  • The approach is limited to a two-dimensional system. The optimization is formulated in the static regime, which may not capture all the dynamics of the system. The use of anisotropic metamaterials can be challenging to fabricate.

    Harnessing normal-shear coupling in metabarriers for deep sub-wavelength underwater noise control · 2026 · DOI

  • To explore the use of other materials or structures for acoustic barrier design. To investigate the scalability of the proposed approach to larger systems. To apply the approach to various fields, such as marine construction or offshore oil and gas exploration.

    Harnessing normal-shear coupling in metabarriers for deep sub-wavelength underwater noise control · 2026 · DOI

  • The need for an analytical treatment of vibro-acoustic wave propagation in cylindrical waveguides with elastic membranes and flexible-shell segments. The lack of a systematic approach to solving the coupled fluid–structure boundary-value problem in such systems.

    Enhanced Transmission Loss and Modal Coupling in Dual-Membrane Flexible-Shell Cylindrical Waveguides: A Rigorous Mode-Matching–Galerkin Framework · 2026 · DOI

  • The conventional impulse-equivalence paradigm in shock isolator design overlooks the key impact of pulse shape. There is a lack of systematic assessment of crashworthy structures under different pulses.

    Shock isolation and energy absorption in a 2D meta-structure based on morphology under fixed impulse loading · 2026 · DOI

  • Future work will focus on translating these insights into practical design guidelines, extending the methodology to irregular, real-world collisions on full vehicle models and train sub-systems, and exploring multi-objective optimization to balance the fundamental SEA-transmissibility trade-off identified for occupant safety. The geometric parametric study was limited to the number of slots, with other parameters like slot width, length and spacing held constant. The bilinear hardening material model used was strain-rate-independent, which may not be representative of high strain-rate scenarios.

    Shock isolation and energy absorption in a 2D meta-structure based on morphology under fixed impulse loading · 2026 · DOI

  • Conventional systems require phased arrays with tens to hundreds of ultrasonic emitters, posing persistent challenges for widespread adoption. The need for compact sound sources capable of shaping and redirecting acoustic energy in space.

    Dual-domain metamaterials co-integrated with a compact ultrasonic transducer for highly directional audio generation · 2026 · DOI

  • Low-cost housing should take advantage of the adoption of noise control roofing materials. 2. Fibre composite studies: hybrid fibre composites should be further investigated. 3. Treatment and orientation of fibres within the matrix should be optimized. REFERENCES Gideon, B., Uche, N. Ben, Efomo, A. O., Gideon, A., & Joshua, J. K. (2018). Data on acoustic behaviour of coconut fibre-reinforced concrete. 21, 1004–1007. Lukáŝ F., & Robert C. (2016). Theoretical approach to determination of acoustic properties of building. 1–6. Mahn, J., & Pearse, J. (2010). Evaluation of the sound insulation of roofing systems. August 2016. Mamtaz, H., & Fouladi, M. H. (2016). Acoustic Absorption of Natural Fiber Composites. Review Article 2016. Obi, F. O., Ugwuishiwu, b. O., & nwakaire, j. N. (2016). Agricultural waste concept, generation, utilization and management. 35(4), 957–964. Olorunnisola, A. O., & Adeniji, A. O. (2019). Investigations on the Effects of Cement Replacement and Calcium Chloride Addition on Selected Properties of Coconut Husk Fibre-Reinforced Roofing Tiles. 11, 253–259. Omoniyi, T. E., & Akinyemi, B. A. (2012). Durability based suitability of bagasse-cement composite for roofing sheets. (3rd December, 2012), 280–290. https://doi.org/10.5897/JCECT12.041 Omoniyi, T. E., & Arosoye, E. O. (2020). Thermal Performance of Cement-Based Composite Tiles Reinforced with Selected Natural Fibres. Pro ligno. 16, 34–42. Sari, N. H., Wardana, I. N. G., Irawan, Y. S., & Siswanto, E. (2017). Corn Husk Fiber-Polyester Composites as Sound Absorber: Nonacoustical and Acoustical Properties. 2017. Singh, A. (2022). Agricultural Waste Management: Problems and Treatments. 148–152.

    SOUND ABSORPTION PERFORMANCE OF FIBRE-REINFORCED CEMENT-BASED ROOFING COMPOSITES: A COMPARATIVE STUDY WITH CONVENTIONAL ROOFING MATERIALS · 2026 · DOI

  • The paper identifies a gap in the current methods for generating radially shaped acoustic orbital angular momentum beams, which require independently driving every element.

    Low-Channel-Count Thermoacoustic Multi-Ring Array for Radially Shaped Acoustic Orbital Angular Momentum Beams · 2026 · DOI

  • The need for sound-absorbing materials in buildings. The lack of investigation into the upcycling of post-consumer glass waste into sound-absorbing panels.

    The Sound of Recycling · 2026 · DOI

  • The challenge of achieving sound absorption and unrestricted airflow concurrently in a one-dimensional scenario. The limitations of prior 2D or 3D designs.

    Design and development of one-dimensional acoustic bundle ventilated metamaterial · 2026 · DOI

  • This work has demonstrated that the internal bracing of the oud soundboard is a primary control parameter for its vibro-acoustic behavior. By combining experimentally validated finite element modeling with coupled struc- tural–acoustic simulations, the study quantified how variations in brace geometry redistribute stiffness, shift modal frequencies, modify stress paths, and ultimately reshape sound radiation. The results confirm that bracing cannot be treated as purely structural reinforcement; it serves as both a mechanical regulator and an acoustic filter that governs how vibrational energy is converted into audible sound. The comparative analysis of fourteen configurations confirmed the expected stiffness–frequency relationship, but its main finding is that no single layout optimizes all performance measures. Instead, each configuration occupies a distinct point in a multidimensional trade-off space linking stiffness, stress concentration, modal bal- ance, and acoustic radiation. The introduction of six quantitative indicators enabled consistent, reproducible evaluation of these trade-offs. Using two distinct sets of design targets revealed that optimality depends on the performance context: stricter cri- teria favor tonal balance and structural robustness, whereas relaxed criteria reward acoustic power and vibrational freedom. Two bracing layouts consistently ranked highest across both target sets, and sensitivity tests showed that their ranking remained stable under reasonable variations in threshold values. A plausible explanation for this consistency is that the two leading layouts share a non-parallel, area-distributing topology that distributes bend- ing stiffness more evenly than denser or more concentrated alternatives. This topology simultaneously diffuses peak stress and preserves an efficient low-order radiator, so its advantages reflect a genuine structural–acoustic Meccanica (2026) 61:89 89 Page 26 of 28 https://doi.org/10.1007/s11012-026-02151-1 mechanism rather than a favorable choice of thresholds. This robustness indicates that the proposed evaluation framework captures intrinsic physical advantages rather than artifacts of parameter tuning. This investigation evaluates structural–acoustic indicators and excludes psychoacoustic listening tests. There- fore, the conclusions address physical performance metrics rather than subjective preference. Integrating player- based evaluation is an important next step. Author contributions Conceptualization: S. Sassi formulated the research idea, defined the scientific objectives, and estab- lished the overall methodological framework. Methodology: S. Sassi and M. Roshun designed the experimental and analytical procedures, including the vibration measurement strategy and modal assessment approach. Finite Elements: Model drawing on SW and Analysis on ANSYS were conducted by M. Al-Awad and A. Sassi. Experimental Investigation: Data acquisi- tion, experimental setup preparation, and testing were carried out by E. Dreik, with primary supervision by S. Sassi and M. Roshun. Data Curation and Formal Analysis: Data interpretation, and mechanical–acoustical analysis were performed by M. Al-Awad and A. Sassi, with support from the co-authors in validation and cross-checking. Writing – Original Draft: The first draft of the manuscript was prepared by S. Sassi. Writing – Review & Editing: All authors contributed to manuscript revision, technical refinement, and improvement of scientific clarity. Supervision: S. Sassi and M. Roshun supervised the research activities and guided the scientific direction of the study. Project Administration: Coordination of tasks and timeline management were handled by S. Sassi and M. Roshun. All authors reviewed and approved the final version of the manuscript. Funding Open Access funding provided by the Qatar National Library. Data availability No datasets were generated or analysed during the current study.

    Vibroacoustic sensitivity of an oud soundboard to bracing geometry · 2026 · DOI

  • Future research should investigate quasi-Minnaert resonance in periodic and multilayered systems. The study of quasi-Minnaert resonance in other domains, such as acoustics and electromagnetism, is a potential future direction.

    On Quasi-Minnaert Resonances in Elasticity and Their Applications to Stress Concentrations · 2026 · DOI

  • The lack of understanding of quasi-Minnaert resonance in elasticity is a significant gap. The complexity of periodic and multilayered systems introduces substantial challenges.

    On Quasi-Minnaert Resonances in Elasticity and Their Applications to Stress Concentrations · 2026 · DOI

  • Ongoing research efforts are directed towards the improvement of various aspects of FSAW technology. Research on carrier substrates that can either improve the performance characteristics or reduce the cost of the technology.

    Efficient modelling and optimization of FSAW resonance structures: a review · 2026 · DOI

  • The need for efficient modelling of surface acoustic wave resonant structures. The lack of a method for COM parameters derivation from fast FEM experiments.

    Efficient modelling and optimization of FSAW resonance structures: a review · 2026 · DOI

  • Current programmable metasurfaces typically manipulate only one type of wave. Concurrent and programmable controls of both acoustic and electromagnetic waves remain elusive. The lack of a metasurface that can achieve simultaneous, independent, and dynamic manipulations of acoustic and electromagnetic waves.

    Dual-physics programmable metasurfaces for dynamical controls of acoustics and electromagnetics · 2026 · DOI

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79 open questions have been extracted from the limitations and future-work passages of 578 Acoustic Wave Phenomena Research papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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