Session: 28-04 Structural/System Design and Dynamics

Paper Number: 103729

103729 - Design of a Magnetic Array for Engine Order Excitation of Rotating Discs 

Blade vibration can have a significant impact on the performance, maintenance, and safety of the aero engines. Hence a large research effort focuses on modelling and validation of the dynamic response of bladed disks and blisks to ensure safe operation.

Engine order excitation constitutes a major source of steady forced vibration of fan and compressor discs during normal engine operation. In engine order excitation the disc rotates past a static pressure field, caused by upstream disturbances in the flow, that varies periodically with angular position. The blades of the disc rotate through the pressure field and are subjected to a periodic force. Computational analyses of disc dynamics – for instance, quantifying mistuning or characterising friction dampers – require validation through experimental measurement of discs when subjected to realistic engine order excitation. This paper presents the design of a magnetic array intended to simulate engine order excitation of a rotating disc. A model is developed that predicts the forces exerted between collections of magnets with simple geometries. The model is validated and used to predict the force applied to a rotating blade by different magnet array configurations. These results inform the design of a magnet array that best meets the specified design criteria.

Presenting Author: Matthew de Brett Imperial College London

Presenting Author Biography: not available yet

Authors:

Matthew de Brett Imperial College London
Christoph Schwingshackl Imperial College London
Garry Edwards Rolls-Royce Plc.