Practical Problems of Modal Analysis of Aero Engine Blades
For some of the aero engine blades, overhaul technology requires testing of their modal shapes and eigenfrequencies. Arrangement of blades on disk according to eigenfrequencies can be the first reason. The second reason can be fatigue control or endurance testing which is cared out on the shaker. In order to help operator on the shaker in searching of eigenfrequencies, it is good to use The Finite Element Method (FEM). For example, modal shapes and eigenfrequncies of blade marked with Bl (Fig. 1), with satisfying deviation, were obtained using FEM and using shaker supported by technique known as technique of “sand figures” [Posavljak S., View on Problems of Development and Exploitation of Aero Engine Disks and Blades (in Serbian), Proceedings of The 5th International Conference DQM-2002, Belgrade, Serbia, 26-27 June 2002, 373-379].
KeywordsFinite Element Method Modal Shape Fracture Position Aero Engine Mechanical Engineer Design
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