All Outputs (49)

Non-cuboid iterative room optimizer
Presentation / Conference
Petrolli, R., D'Antonio, P., Storyk, J., Hargreaves, J., & Betcke, T. Non-cuboid iterative room optimizer. Presented at Forum Acusticum, Online

In small room acoustics, the range from the first resonant frequency up to the Schroeder frequency is dominated by modal resonances and the Speaker-Boundary Interference Response (SBIR). Both are very sensitive to the positioning of sources, receiver... Read More about Non-cuboid iterative room optimizer.

Optimising sound field synthesis using acoustic cross-energy metrics
Presentation / Conference
Hargreaves, J. Optimising sound field synthesis using acoustic cross-energy metrics. Presented at Forum Acusticum, Online

When evaluating or optimising the accuracy of sound field synthesis, it is commonplace to only consider the error in the pressure field that is reproduced. While this is justifiable perceptually - pressure is what we hear - it neglects error in parti... Read More about Optimising sound field synthesis using acoustic cross-energy metrics.

Synergies between the high-frequency Boundary Element Method and Geometric Acoustics
Presentation / Conference
Hargreaves, J. Synergies between the high-frequency Boundary Element Method and Geometric Acoustics. Presented at Forum Acusticum, Online

The audible frequency range covers many octaves in which the wavelength changes from being large with respect to dominant features of a space to being comparatively much smaller. This makes numerical prediction of a space’s acoustic response, e.g. fo... Read More about Synergies between the high-frequency Boundary Element Method and Geometric Acoustics.

Acquisition of bi-directional reflectance functions by Nearfield Acoustical Holography – a preliminary study
Presentation / Conference
Hargreaves, J. Acquisition of bi-directional reflectance functions by Nearfield Acoustical Holography – a preliminary study. Presented at International Congress on Acoustics 2019, Aachen

It is well known that material absorption and scattering is dependent on incidence and observation angle. Despite this, the corresponding standardised coefficients, which are used to represent these mechanisms within computational acoustic models, ag... Read More about Acquisition of bi-directional reflectance functions by Nearfield Acoustical Holography – a preliminary study.

Perception of noise from large wind turbines (EFP-06 Project)
Report
(EFP-06 Project)

Is noise from large wind turbines more annoying than noise from small wind turbines? This is a question that is discussed widely in the context of a new generation of large wind turbines replacing the traditional smaller ones. To date legislation ta... Read More about Perception of noise from large wind turbines (EFP-06 Project).

Towards a full-bandwidth numerical acoustic model
Presentation / Conference
Hargreaves, J., & Lam, Y. Towards a full-bandwidth numerical acoustic model. Presented at Forum Acusticum, Krakow, Poland

Prediction models are at the heart of modern acoustic engineering and are used in a diverse range of applications from refining the acoustic design of classrooms and concert halls to predicting how noise exposure varies through an urban environment.... Read More about Towards a full-bandwidth numerical acoustic model.

Acoustic cross-energy measures and their applications
Presentation / Conference
Hargreaves, J., & Lam, Y. Acoustic cross-energy measures and their applications. Presented at The 22nd International Congress on Sound and Vibration, Florence. Italy

Acoustic energy density and acoustic intensity are quantities which are well established and widely applied. When these are applied to pressure and particle-velocity fields which are the linear superposition of more than one wave they naturally separ... Read More about Acoustic cross-energy measures and their applications.

A high-frequency BEM for 3D acoustic scattering
Presentation / Conference
Hargreaves, J., Lam, Y., Langdon, S., & Hewitt, D. A high-frequency BEM for 3D acoustic scattering. Presented at 22nd International Congress on Sound and Vibration, Florence. Italy

The Boundary Element Method (BEM) is a powerful method for simulating scattering of acoustic waves which has many advantages, particularly when the problem concerns an object in an unbounded medium. Its applications are however limited in practice be... Read More about A high-frequency BEM for 3D acoustic scattering.

Implementing wave field synthesis in an ITU spec listening room part 2: Bass without modes
Presentation / Conference
Hargreaves, J., & Wankling, M. Implementing wave field synthesis in an ITU spec listening room part 2: Bass without modes. Presented at Reproduced Sounds 2011, Brighton

In recent years various sound reproduction systems have been proposed which attempt to use multiple transducers to tame the modal behaviour often prominent in rooms at low frequencies. Of particular interest is the Controlled Acoustic Bass System (C... Read More about Implementing wave field synthesis in an ITU spec listening room part 2: Bass without modes.