Aeroacoustic design and optimisation of an all-electric ducted fan propulsion module for low-noise impact (2022)
Presentation / Conference
Casagrande Hirono, F., Torija Martinez, A., Elliott, A., Taylor, J., Grimshaw, S., & Lefas, D. (2022, June). Aeroacoustic design and optimisation of an all-electric ducted fan propulsion module for low-noise impact. Presented at 28th AIAA/CEAS Aeroacoustics 2022 Conference, Southampton, UK

This paper discusses the aeroacoustic aspects of the design, construction and testing of an all-electric ducted fan propulsion module for future electric aircraft. An overview of the propulsor aerodynamic design is provided. Acoustic measurements mad... Read More about Aeroacoustic design and optimisation of an all-electric ducted fan propulsion module for low-noise impact.

Generation and analysis of artificial warning sounds for electric scooters (2021)
Report
Torija Martinez, A., Elliott, A., Harris, L., Podwinska, Z., Welham, C., Nicholls, R., …Williams, D. Generation and analysis of artificial warning sounds for electric scooters

• emTransit B.V (Dott) is a European mobility operator currently operating over 30,000 electric scooters in Belgium, France, Germany, Italy, Poland and now the UK. The company aims to expand its UK operations and has recently won a tender for the Tra... Read More about Generation and analysis of artificial warning sounds for electric scooters.

Vibro-acoustic analysis of a domestic product based on experimental measurement and hybrid modelling (2021)
Journal Article
Meggitt, J., Banwell, G., Elliott, A., Moorhouse, A., & Langley, R. (2021). Vibro-acoustic analysis of a domestic product based on experimental measurement and hybrid modelling. Applied Acoustics, 182, 108144. https://doi.org/10.1016/j.apacoust.2021.108144

The purpose of this paper is to present a case study whereby a hybrid experimental-numerical model is used to analyse the structureborne
radiation from a domestic product (vacuum cleaner head). The passive (including radiative) properties of the str... Read More about Vibro-acoustic analysis of a domestic product based on experimental measurement and hybrid modelling.

Component replacement TPA : a transmissibility-based structural modification method for in-situ transfer path analysis (2021)
Journal Article
Meggitt, J., Elliott, A., Moorhouse, A., Jalibert, A., & Franks, G. (2021). Component replacement TPA : a transmissibility-based structural modification method for in-situ transfer path analysis. Journal of Sound and Vibration, 499, 115991. https://doi.org/10.1016/j.jsv.2021.115991

In-situ Transfer Path Analysis is a diagnostic method used to analyse the propagation of noise and vibration through
complex built-up structures. Its defining feature is the invariant characterisation of an assembly’s active components
(i.e. vibrat... Read More about Component replacement TPA : a transmissibility-based structural modification method for in-situ transfer path analysis.

Evaluation of uncertainties in classical and component (blocked force) transfer path analysis (TPA) (2019)
Journal Article
Moorhouse, A., Meggitt, J., & Elliott, A. (2019). Evaluation of uncertainties in classical and component (blocked force) transfer path analysis (TPA). SAE Technical Papers, 1(4), 1779-1789. https://doi.org/10.4271/2019-01-1544

Transfer path analysis (TPA) has become a widely used diagnostic technique in the automotive and other sectors. In classic TPA, a two-stage measurement is conducted including operational and frequency response function (FRF) phases from which the con... Read More about Evaluation of uncertainties in classical and component (blocked force) transfer path analysis (TPA).

Development of a hybrid FE-SEA-experimental model (2019)
Journal Article
Clot, A., Meggitt, J., Langley, R., Elliott, A., & Moorhouse, A. (2019). Development of a hybrid FE-SEA-experimental model. Journal of Sound and Vibration, 452(Jul 19), 112-131. https://doi.org/10.1016/j.jsv.2019.03.027

The vibro-acoustic response of complex structures with uncertain properties is a problem of great concern for modern industries. In recent years, much research has been devoted to the prediction of this response in the mid-frequency range where, beca... Read More about Development of a hybrid FE-SEA-experimental model.

In situ determination of dynamic stiffness for resilient elements (2015)
Journal Article
Meggitt, J., Elliott, A., Moorhouse, A., & Lai, K. (2016). In situ determination of dynamic stiffness for resilient elements. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 230(6), 986-993. https://doi.org/10.1177/0954406215618986

An in situ method for the measurement of a resilient lements dynamic transfer stiffness is outlined and alidated. Unlike current methods, the proposed in situ approach allows for the characterisation of a resilient element whilst incorporated into an... Read More about In situ determination of dynamic stiffness for resilient elements.

Omnidirectional acoustic absorber with a porous core and a metamaterial matching layer (2014)
Journal Article
layer. Journal of Applied Physics, 115(20), 204902. https://doi.org/10.1063/1.4876119

An omnidirectional sound absorber based on the acoustic analogy of the electromagnetic metamaterial
“black hole” has been developed and tested. The resulting structure is composed of a hollow
cylindrical porous absorbing core and a graded index mat... Read More about Omnidirectional acoustic absorber with a porous core and a metamaterial matching layer.

In-situ source path contribution analysis of structure borne road noise (2013)
Journal Article
Elliott, A., Moorhouse, A., Huntley, T., & Tate, S. (2013). In-situ source path contribution analysis of structure borne road noise. Journal of Sound and Vibration, 332(24), 6276-6295. https://doi.org/10.1016/j.jsv.2013.05.031

Source-path-contribution (SPC) analysis, also known as transfer path analysis (TPA), is a technique widely used in the automotive industry for rank ordering noise and vibration sources. The SPC approach is known to provide reliable diagnostic informa... Read More about In-situ source path contribution analysis of structure borne road noise.

An air spring (2012)
Patent
Coakley, J., & Elliott, A. (2012). An air spring

There is provided an air spring (1) for supporting a load, the air spring (1) comprises a chamber (50) for holding a pressurised gas in use, a load-bearing surface (10) arranged to transmit a force from a load in use to the pressurised gas held in th... Read More about An air spring.

Noise and vibration from building-mounted micro wind turbines Part 2: Results of measurements and analysis (2011)
Report
Part 2: Results of measurements and analysis

Description

To research the quantification of vibration from a micro turbine, and to develop a method of prediction of vibration and structure borne noise in a wide variety of installations in the UK.

Objective

The objectives of the study... Read More about Noise and vibration from building-mounted micro wind turbines Part 2: Results of measurements and analysis.

Some relationships for coupled structures and their application to measurement of structural dynamic properties in situ (2011)
Journal Article
Moorhouse, A., Evans, T., & Elliott, A. (2011). Some relationships for coupled structures and their application to measurement of structural dynamic properties in situ. Mechanical Systems and Signal Processing, 25(5), 1574 - 1584. https://doi.org/10.1016/j.ymssp.2010.12.016

Three relationships are presented for indirect determination of the structural dynamic properties of substructures, namely the blocked force, mobility and free velocity. First, it is shown that the blocked force of a vibration source can be obtained... Read More about Some relationships for coupled structures and their application to measurement of structural dynamic properties in situ.

Structure-borne sound and vibration from building-mounted wind turbines (2011)
Journal Article
Moorhouse, A., Elliott, A., Eastwick, G., Evans, T., Ryan, A., von Hünerbein, S., …Waddington, D. (2011). Structure-borne sound and vibration from building-mounted wind turbines. Environmental Research Letters, 6(3), 035102. https://doi.org/10.1088/1748-9326/6/3/035102

Noise continues to be a significant factor in the development of wind energy resources. In the case of building-mounted wind turbines (BMWTs), in addition to the usual airborne sound there is the potential for occupants to be affected by structure-bo... Read More about Structure-borne sound and vibration from building-mounted wind turbines.

Noise and vibration from building-mounted micro wind turbines part 3 : prediction methodology (2011)
Report
part 3 : prediction methodology

This brief report describes a simplified method for estimation of
levels of structure-borne sound in buildings to which a micro-wind
turbine (MWT) is attached. The method is applicable to two specific
designs of MWT, each for three lengths of moun... Read More about Noise and vibration from building-mounted micro wind turbines part 3 : prediction methodology.

Noise and vibration from building-mounted micro wind turbines Part 1: Review and proposed methodology (2011)
Report
Moorhouse, A., Elliott, A., Eastwick, G., von Hünerbein, S., & Waddington, D. (2011). Noise and vibration from building-mounted micro wind turbines Part 1: Review and proposed methodology

Description

To research the quantification of vibration from a micro turbine, and to develop a method of prediction of vibration and structure borne noise in a wide variety of installations in the UK.

Objective

The objectives of the study... Read More about Noise and vibration from building-mounted micro wind turbines Part 1: Review and proposed methodology.

In-situ characterisation of structure borne noise from a building mounted wind turbine (2010)
Presentation / Conference
building mounted wind turbine. Presented at ISMA 2010, Katholieke Universiteit Leuven, Belgium

Building mounted micro wind turbines (BMWTs) could potentially provide a useful contribution to
renewable energy production but a means of predicting structure-borne sound and vibration is required. A
particular difficulty is that BMWTs can only be... Read More about In-situ characterisation of structure borne noise from a building mounted wind turbine.

Structure-Borne sound characterization of coupled structures—part II: Feasibility study
Journal Article
Pavić, G., & Elliott, A. Structure-Borne sound characterization of coupled structures—part II: Feasibility study. Journal of Vibration and Acoustics, 132(4), 041009. https://doi.org/10.1115/1.4000981

A novel method has been outlined in the first part of this paper aimed at characterization of structure-borne sound transmission from a vibration source coupled via resilient mounts to a receiver. It can deliver the source mobility and its free veloc... Read More about Structure-Borne sound characterization of coupled structures—part II: Feasibility study.

Structure-Borne sound characterization of coupled structures—part I: Simple demonstrator model
Journal Article
Pavić, G., & Elliott, A. Structure-Borne sound characterization of coupled structures—part I: Simple demonstrator model. Journal of Vibration and Acoustics, 132(4), 041008. https://doi.org/10.1115/1.4000980

A method has been developed to characterize a vibration source when coupled via resilient mounts to a receiver structure. This two-step measurement procedure can deliver the mobility and free velocity of a source, together with the mobility of the re... Read More about Structure-Borne sound characterization of coupled structures—part I: Simple demonstrator model.

Moment excitation and the measurement of moment mobilities
Journal Article
Elliott, A., Moorhouse, A., & Pavić, G. Moment excitation and the measurement of moment mobilities. Journal of Sound and Vibration, 331(11), 2499-2519. https://doi.org/10.1016/j.jsv.2012.01.022

Frequency response functions (FRF), such as mobilities, are widely used in the analysis of vibration and structure-borne sound and it is important that this FRF data can be measured accurately for all important degrees of freedom. In some cases three... Read More about Moment excitation and the measurement of moment mobilities.

Passive acoustic thermometry
Presentation / Conference
Elliott, A. Passive acoustic thermometry. Presented at Internoise 2016, Hamburg

Conventional acoustic thermometry is usually performed by exciting a resonator with a sound source and identifying the resonant frequencies of the system. If the dimensions of such system are known it is relatively straightforward then to determine t... Read More about Passive acoustic thermometry.