Outputs (41)

Mathematical theory and applications of multiple wave scattering (2025)
Journal Article

The Isaac Newton Institute for Mathematical Sciences hosted a six-month programme on Mathematical Theory and Applications of Multiple Wave Scattering (MWS) in 2023. The programme was driven by the rapidly growing international research interest in mu... Read More about Mathematical theory and applications of multiple wave scattering.

Acoustic Characterisation and Modelling of Multi-Fibrous Nonwovens (2024)
Thesis

This thesis explores the theoretical, numerical, and experimental approaches for nonwoven materials with the intent of quantifying, testing, and characterising the acoustic performance of currently available products and to guide the development of a... Read More about Acoustic Characterisation and Modelling of Multi-Fibrous Nonwovens.

Nonlinear behaviour of lossy acoustic black holes (2024)
Presentation / Conference Contribution

Sound absorption properties of acoustic black holes are studied for high pressure amplitudes. The absorbers consist of thin circular plates, each with a central perforation, separated by annular air cavities. Radius of the perforation of each plate d... Read More about Nonlinear behaviour of lossy acoustic black holes.

Urban Hedges as Noise Barriers: Does Plant Species Choice Affect Insertion Loss? (2024)
Presentation / Conference Contribution

Noise in urban environments is responsible for annoyance and adverse health effects. Noise barriers are used to mitigate noise and are effective when properly designed and installed, but provide little visual or biodiversity benefit. Hedges are frequ... Read More about Urban Hedges as Noise Barriers: Does Plant Species Choice Affect Insertion Loss?.

FE Modelling Tibia Bone Vibration - The Influence of Shape, Twist, and Size (2024)
Presentation / Conference Contribution

The vibration response of bone has the potential to be used as a measure of bone strength for Osteoporosis detection. Modelling the vibration response requires capturing the shape of the long bones which have several complicated features. Yet modelli... Read More about FE Modelling Tibia Bone Vibration - The Influence of Shape, Twist, and Size.

Multiple resonances in lossy acoustic black holes - theory and experiment (2022)
Journal Article
Umnova, O., Brooke, D., Leclaire, P., & Dupont, T. (2022). Multiple resonances in lossy acoustic black holes - theory and experiment. Journal of Sound and Vibration, 543, https://doi.org/10.1016/j.jsv.2022.117377

Acoustic properties of the metamaterial graded absorber, also known as ``acoustic black hole'', are studied in the linear regime. The absorber consists of thin metallic circular plates, each with a central perforation, separated by annular air caviti... Read More about Multiple resonances in lossy acoustic black holes - theory and experiment.

Acoustic wave propagation in permeable lossy metamaterials (2022)
Journal Article
Venegas, R., Núñez, G., Boutin, C., Umnova, O., & Zhang, Q. (2022). Acoustic wave propagation in permeable lossy metamaterials. Physics of Fluids, 34(1), 017117. https://doi.org/10.1063/5.0077342

This paper investigates acoustic wave propagation in gas-saturated permeable lossy metamaterials, which have different types of resonators, namely, acoustic and elastic resonators, as building-block elements. By using the two-scale asymptotic homogen... Read More about Acoustic wave propagation in permeable lossy metamaterials.

Acoustic metamaterials comprised of dead-end pores and black hole effect for low frequency sound absorption in linear and nonlinear regimes (2021)
Thesis
Brooke, D. Acoustic metamaterials comprised of dead-end pores and black hole effect for low frequency sound absorption in linear and nonlinear regimes. (Thesis). University of Salford

The aim of this work is to design and test acoustic metamaterial absorbers particularly for mitigation of
low frequency sound of high intensity. The absorbers designed are formed of a series of plates with a
central perforation, separated by air... Read More about Acoustic metamaterials comprised of dead-end pores and black hole effect for low frequency sound absorption in linear and nonlinear regimes.

Acoustic metamaterial for low frequency sound absorption in linear and nonlinear regimes (2020)
Journal Article

Acoustic metamaterial absorbers have been built and tested with
focus on low frequency airborne sound absorption in linear and nonlinear
regimes. The absorbers are made up of a series of piled up flat cavities,
separated by thin walls and traverse... Read More about Acoustic metamaterial for low frequency sound absorption in linear and nonlinear regimes.

Nonlinear dynamics of coupled transverse-rotational waves in granular chains (2019)
Journal Article
Zhang, Q., Umnova, O., & Venegas, R. (2019). Nonlinear dynamics of coupled transverse-rotational waves in granular chains. Physical Review E, 100(6), 062206. https://doi.org/10.1103/PhysRevE.100.062206

The nonlinear dynamics of coupled waves in one-dimensional granular chains with and without a substrate
is theoretically studied accounting for quadratic nonlinearity. The multiple time scale method is used to derive
the nonlinear dispersion relati... Read More about Nonlinear dynamics of coupled transverse-rotational waves in granular chains.