Advanced technologies for aircraft engine vibration reduction

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The objective of the proposed research is the development of advanced technologies and tools to reduce aircraft engine vibration. Engine-induced vibration is the main source of aircraft structural vibration, which contributes significantly to cabin noise. As the cost of fossil fuels rises, the industry is shifting to the next generation of aircraft, which feature lighter and more aerodynamically efficient airframes. Structural vibrations must be taken into account in the design processes of these aircraft. A similar trend is reflected in the aircraft engine market as well. This research addresses the above issue in three main phases: simulation, experiments, and the development of design guidelines and tools. First, numerical and analytical models, which can accurately account for the complex geometries, boundary conditions, and nonlinear behaviour of aircraft engine system and components, will be developed. Several different levels of experiments including component, rig, and engine system levels will then be carried out to facilitate enough data to validate and calibrate the component and system models. These substantiated models will be used to represent the multi-disciplinary nature of engine systems with regard to their fluid dynamic and mechanical characteristics. They will also be dynamically reduced and fine-tuned/optimized so that they are computationally efficient and can be applied in the practical industrial environment. The predictions of the fine-tuned models will then be employed to establish design and analysis guidelines in the engine design cycle. By utilizing the modern structural dynamic facilities at the University of Toronto combined with the technical expertise at Pratt & Whitney Canada, this project is expected to produce a wealth of advanced technology and knowledge for aircraft engine vibration reduction. The enhancement to the engine design cycle through high fidelity simulation models and tools significantly increases the potential of successful innovative designs and integrated engineering solutions. Thus it will strengthen the technological edge for P&WC and the Canadian aerospace industry in this competitive industry. This research will also provide a unique opportunity for the training of highly qualified personnel.