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Biography

Dr. John Kennedy is Assistant Professor in Vibrations, Acoustics and Dynamics at Trinity College Dublin. His research career began on the aero-acoustics of jets with mixing enhancing features. Since then he has gone on to work on a range of aero-acoustic problems in transport applications. His research has applied advanced correlation and spectral analysis techniques to experimental data of turbulence (LDV, X-hotwire and high speed PIV) and included advanced beamforming and partial coherence techniques for source localisation using microphone array data. He has also engaged in interdisciplinary research with psychologists from the University of Bath and the University of Aberystwyth into the influence of noise exposure on human performance in transport applications including hazard detection, risk perception and annoyance. He has been the scientific coordinator and lead technical manager of the Clean Sky projects WENEMOR, ALLEGRA and ARTIC. His responsibilities on these projects included the conduct of Preliminary and Critical Design Reviews, test planning and supervision of the wind tunnel test campaigns. He was also the lead research for all scientific deliverables on these projects. He is the Irish coordinator for the industrially focused Institute of Acoustics' Diploma in Acoustics and Noise Control. He has acted as a reviewer for a number in high profile journals in aero-acoustics including the Journal of Sound and Vibration, the Journal of the Acoustical Society of America, Acta Acoustica and the International Journal of Aeroacoustics. His work in transport aero-acoustics has led to press releases by the Acoustical Society of America and the American Institute of Physics. He is currently the Principle Investigator on the European H2020 AERIALIST project investigating how the latest additive manufacturing technologies can be used to produce novel metamaterials for the control of aircraft noise.

Research Tags

ACOUSTICS Aerodynamics Aeronautics Air Transport Technology Applied thermodynamics and energy Computational Fluid Dynamics Environmental aspects of transportation Fluid Dynamics Fluid Mechanics Fluids and vibration Manufacturing engineering Mechanical Engineering Noise pollution, technology Signal processing Sound Engineering Transport psychology and safety Turbomachinery Turbulence Vibration and Accoustic Engineering Wind Tunnels

Research Projects

Project Title

AERIALIST

From

01/06/2017

31/05/2020

Summary

AERIALIST aims at the application of acoustic metamaterial technologies to modify the intensity and the directivity patterns of aircraft noise sources in order to mitigate the community noise induced by the civil aviation. AERIALIST aims to: i)Extend acoustic metamaterial theory to take into account the effect of a realistic aerodynamic flow and comply to the strict weight constraints typical of the aeronautical applications. ii) Develop advanced numerical methods to simulate acoustic metamaterial in aeronautic operating conditions and characterize the mechanical properties required to achieve the target behaviour. iii) Use state of the art additive manufacturing technologies to develop new strategies for the manufacture of acoustic meta-materials in physically useful volumes and provide a roadmap for future development to higher TRL. iv) Provide a proof of concepts through the experimental validations of the most promising designs, evaluate the technical feasibility of noise-reductions devices based on the developed technology, and identify a possible roadmap to their practical realization.

Funding Agency

EU H2020

Programme

SOCIETAL CHALLENGES - Smart, Green And Integrated Transport

Project Title

TANDEM

From

01/06/2019

31/05/2021

Summary

TANDEM (Tuneable Acoustic Noise DampEning Materials) brings together expertise from acoustics, applied mathematics, and chemistry to deliver the next generation of acoustic materials. It will focus on the development of SoundBounce - an innovative new noise-cancelling metamaterial. The smart acoustic material can be used in the automotive, aerospace, construction, and power generation industries. SoundBounce provides a cost-effective way of absorbing harmful or unwanted noise, protecting people and structures.

Funding Agency

EU H2020

Programme

H2020 SME Instrument

Project Title

Advanced acoustic metamaterials for noise reduction, optimised for additive manufacturing technologies

From

01/09/2019

31/08/2023

Summary

In recent years a new class of acoustic materials with highly unusual properties has been proposed known as an acoustic metamaterial. These materials have the ability to alter the reflection, refraction or diffraction of sound in a controlled manner that is unlike any traditional or natural material. These metamaterials are often based on a complex geometric microstructure that must be precision manufactured to achieve the acoustic properties desired. Firstly this research will address the design of the material microstructure. Designs must be amenable to numerical simulations so that targeted behaviour can be achieved. The second challenge lies in successfully manufacturing the designed microstructure to the necessary precision. Finally the design loop will be closed as the physical test results are used to validate and develop the numerical simulations. This will allow an iterative design process which will expand our understanding of the physics and manufacture of these metamaterials with each iteration through the loop.

Funding Agency

Irish Research Council

Programme

Government of Ireland Postgraduate Scholarship Programme

Project Title

Noise-Adapt

From

01/2/2018

01/06/2020

Summary

In accordance with Art. 6.2 of the Environmental Noise Directive (END), the European Commission recently developed Common Noise assessment methods (CNOSSOS-EU) for road, railway, aircraft and industrial noise to be used after adoption by the Member States for the purpose of strategic noise mapping as required by Article 7 of the END. Noise-Adapt will provide a transitional needs assessment for adapting to CNOSSOS-EU in the Irish context for road, rail, air, and industry, including the administration of a standardised approach for population exposure estimation (Strategic Noise Mapping).

Funding Agency

Environmental Protection Agency

Programme

EPA-2017-HW-MS-9

Project Title

WENEMOR

From

01/09/2011

28/02/2013

Summary

The WENEMOR project has been developed in response to the requirements of the European Clean Sky Joint Technology Initiative to assess the aero-acoustic noise emissions for an advanced regional open rotor aircraft configuration. The consortium consists of 7 partners including two universities (Trinity College Dublin and Università Politecnica delle Marche), a large European wind tunnel facility (Pininfarina) and several SMEs (Eurotech, Teknosud, MicrodB and Paragon S.A.) with specific competences in design and manufacture and noise measurements and data analysis. The project utilises a proposed design for an advanced regional aircraft configuration for the model geometries with realistic modern blade profiles for the propulsion system. The project has designed, manufactured and tested a 1/7th scale model of the proposed open rotor aircraft design. The model consisted of a modular design featuring interchangeable tail pieces, variable fuselage length, engine pylon rotation and elongation and was controllable for angle of attack. The test campaign consisted of aero-acoustic measurements in an open test section of a large low speed wind tunnel for a wide ranging set of configurations.

Funding Agency

EU Clean Sky

Programme

Green Regional Aircraft

Person Months

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Representations

Details	Date
Scientific Committee of the 21st Workshop of the Aeroacoustics Specialists Committee of the Council of European Aerospace Societies	2017
Scientific Committee of the 23rd Workshop of the Aeroacoustics Specialists Committee of the Council of European Aerospace Societies	2019
Scientific Committee of the 45th International JVE (Journal of Vibroengineering) Conference	2020

Memberships

Membership of Professional Institutions, Associations, Societies

Details	Date From	Date To
Member of the Institute of Acoustics (MIOA) - The Institute of Acoustics is the UK's professional body for those working in acoustics, noise and vibration. It was formed in 1974 and is a nominated body of the Engineering Council, offering registration at Chartered and Incorporated Engineer levels. The range of interests of members embraces aspects such as aerodynamics, architectural acoustics, building acoustics, electroacoustics, engineering dynamics, noise and vibration, hearing, speech, underwater acoustics, together with a variety of environmental aspects.

Publications and other Research Outputs

H.J.Rice J.Kennedy P.Göransson L.Dowling D.Trimble, Design of a Kelvin cell acoustic metamaterial, Journal of Sound and Vibration, 472, (115167), 2020, Journal Article, PUBLISHED TARA - Full Text DOI

Dowling L., Kennedy J., O'Shaughnessy S., Trimble D., A review of critical repeatability and reproducibility issues in powder bed fusion, Materials and Design, 186, 2020, Journal Article, PUBLISHED DOI

Roberto Merino-Martínez, Eleonora Neri, Mirjam Snellen, John Kennedy, Dick G. Simons and Gareth J. Bennett, Multi-Approach Study of Nose Landing Gear Noise, Journal of Aircraft , 57, (3), 2020, p517 - 533, Notes: [Published Online: 27 Jan 2020], Journal Article, PUBLISHED DOI URL

Kennedy John, Dowling Luke, Flanagan Lara, Rice Henry, Trimble Daniel, The influence of additive manufacturing strategies on the performance of acoustic metamaterials , 9th EASN International Conference on Innovation in Aviation and Space , 2019, 2019, Conference Paper, PUBLISHED

Faulkner Jon Paul, Cassidy Matthew, Murphy Enda, Kennedy John, Rice Henry, Validation of Acceleration and Deceleration in proximity to Junctions under CNOSSOS-EU , Irish Transport Research Network Conference , 2019, 2019, Conference Paper, PUBLISHED

Jennings, Simon; Kennedy, John, Detection and Evaluation of Amplitude Modulation From a Wind Energy Development, Ireland, Acta Acustica united with Acustica, Volume 105, (Number 6), 2019, p1042 - 1052, Notes: [https://doi.org/10.3813/AAA.919383], Journal Article, PUBLISHED

Kennedy, J., L., Flanagan, Dowling, L., Rice, H., Trimble, D., , The influence of additive manufacturing processes on the performance of a periodic acoustic metamaterial, International Journal of Polymer Science, Volume 2019, (Article ID 7029143), 2019, Journal Article, PUBLISHED TARA - Full Text URL

John Kennedy, Lara Flanagan, Luke Dowling, Gareth J. Bennett, Henry Rice, and Daniel Trimble, The Influence of Additive Manufacturing Processes on the Performance of a Periodic Acoustic Metamaterial, International Journal of Polymer Science, 2019, 2019, p1-11 , Journal Article, PUBLISHED TARA - Full Text URL

Kun Zhao, Patrick Okolo, Eleonora Neri, Peng Chen, John Kennedy, Gareth J. Bennett, Noise reduction technologies for aircraft landing gear-A bibliographic review, Progress in Aerospace Sciences, 112, 2019, p100589 , Journal Article, PUBLISHED DOI URL

Patrick N Okolo, Kun Zhao, John Kennedy, Gareth J Bennett, Numerical assessment of flow control capabilities of three dimensional woven wire mesh screens, European Journal of Mechanics - B/Fluids, 76, 2019, p259-271 , Journal Article, PUBLISHED URL

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John Kennedy, Turbulence and Noise, Faculty of Engineering, University of Bristol, February, 2018, Professor Mahdi Azarpeyvand, Invited Talk, PUBLISHED

Kennedy, J., Holt, N., Walker, I., The influence of sound on the safety of vulnerable road users, SWOV Institute for Road Safety Research, 2011, Invited Talk, PUBLISHED

Trinity College Dublin, The University of Dublin

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Dr. John Kennedy

Dr. John Kennedy

Assistant Professor (Mechanical, Manuf & Biomedical Eng)

PARSONS BUILDING

jkenned5@tcd.ie

3531896 4252

Biography

Research Tags

Research Projects

Representations

Memberships

Membership of Professional Institutions, Associations, Societies

Publications and other Research Outputs

Publications