About the Project
Invariably the acoustic fatigue of structures, typically aerospace structures due to jet or rocket noise excitation, is still predicted by applying formulae based on the assumption that a single mode dominates the response together with assumptions on the spectrum and spatial correlation of the sound field. This is a simple approach, which is normally conservative and easy to implement and use for predictions and modelling. On the other hand methods for reducing the response and improving the fatigue life will require novel vibration control, either through suitably optimised passive attachments (e.g. tuned mass dampers, damping treatments, etc.) or by structural design to reduce the strength of the acoustic-structural coupling.
This project will investigate the response and subsequent fatigue prediction methodology for cylindrical or curved structures of advanced structural design, e.g. based on composite and/or sandwich construction with the potential effect of stiffeners or reinforcements. The modelling will investigate the contribution of multi-modal response in which higher frequency modes, albeit with a lower response, could contribute significantly to the fatigue life due to their higher frequencies.
To consider the control of the response, a review and critical appraisal will be carried out of different passive control methodologies and their applicability. This will be followed by an investigation of the optimum performance of passive control methodologies taking into account existing parameter or design limitations including location and subsequent response reduction. A complementary study will consider the effect of design changes to the structure including the response sensitivity to structural geometry, and either regular periodic or perturbed spacings of the attachment to the supporting structure.
This project involves collaboration with the Beijing Institute of Structure and Environment Engineering and might involve the possibility of an overseas visit to feedback progress and obtain experimental data and design information. The successful candidate should have a 1st or 2:1 class engineering or applied mathematics degree (or equivalent), ideally with experience in vibration and structural dynamics or vibroacoustics and some experience of programming in Matlab or similar.
The studentship, covering three years PhD registration fees and a stipend at the UK EPSRC rate, is based in the Dynamics Research Group (DG) within the Institute of Sound and Vibration Research (ISVR) in the Faculty of Engineering and the Environment. ISVR is a leading international centre for research in acoustics and vibration and has a reputation as a leader in noise and vibration research. The Faculty brings together a wide range of inter-related disciplines and sectors, including acoustical, aerospace, biomedical, civil, computational, electro-mechanical, environmental, mechanical and materials engineering, energy technologies, ship science and transportation with world class strength in depth.
If you wish to discuss any details of the project informally, please contact Dr. Neil Ferguson, Dynamics Group, Email: [Email Address Removed], Tel: +44 (0) 2380 593225
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