Blade-to-blade variations of bladed disk assemblies result in local zoning of vibration modes as well as amplitude magnifications, which primarily reduces the high cycle fatigue life of aeroengines. Criteria were introduced to determine the level of these mode localization effects depending on various parameters of a real high pressure compressor blisk rotor. The investigations show that blade vibration modes with lower interblade coupling, e.g., torsion modes or modes with high numbers of nodal diameter lines, have a significantly higher sensitivity to blade mistuning, which can be characterized by the higher percentage of blades on the total blisk strain energy.
Issue Section:
Research Papers
Keywords:
aerospace engines,
blades,
discs (structures),
fatigue,
rotors,
vibrations,
blisk,
mistuning,
mode localization,
blade vibration
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.Copyright © 2009
by American Society of Mechanical Engineers
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