Friction-induced traveling wave coupling in tuned bladed-disks

Abstract Flutter is a major constraint on modern turbomachines; as the designs move toward more slender, thinner, and loaded blades, they become prone to experience high cycle fatigue problems. Dry friction, present at root attachment for cantilever configurations, one of main sources energy dissipation. It saturates flutter vibration amplitude growth, producing limit oscillation whose depends balance between injected dissipated by system. Both phenomena, typically produce small correction purely elastic response structure. A large number cycles required notice their effect, which appears slow modulation amplitude. Furthermore, even longer time scales appear when multiple traveling waves are aerodynamically unstable exhibit similar growth rates. All these make system integration very stiff CPU expensive, bringing some doubts about whether final solutions properly converged. In order avoid uncertainties, numerical continuation procedure applied analyze that set in, wave content, bifurcations stability. The modeled using an asymptotic reduced model results validated against direct integrations. New states with content found analyzed. These have not been obtained before case microslip friction blade attachment; only consisting single reported in previous works.