НАУЧНЫЕ, ТЕХНИЧЕСКИЕ И ЭКОНОМИЧЕСКИЕ ПРОБЛЕМЫ SCIENTIFIC, TECHNICAL AND ECONOMICAL PROBLEMS UDC 531.1 © R.F. Ganiev, O.B. Balakshin, B.G. Kukharenko BIFURCATION OF RESONANCE UNDER TURBOCOMPRESSOR ROTOR BLADE FLUTTER Bifurcation of resonance trajectory of axial turbo compressor rotor blades is under study, which jumps to blade flutter. <...> For this purpose a spectral analysis of blade transient oscillation records is performed. <...> As shown, in contrast to resonance case of constant phase difference between excitation and induced blade oscillations, phase shift of blade collective synchronous oscillations under flutter depends on blade number and diametral mode of blade cascade. <...> Blade flutter mode relates on a diametral mode of air flow pressure pulsation. <...> Keywords: resonance, unstable oscillations, bifurcation, flutter, time series, spectral analysis, Prony method A compressor rotor is made of an inner cylindrical part (the disk) and an outer bladed part. <...> Finally, the friction interfaces provide significant damping to the disks for energy dissipation. <...> However, this solution is relatively heavy due to the presence of the securing devices. - Integrally bladed disks (blisks) are machined from a single block of metal (Fig. 1). <...> Besides, the disk blades are very lightly damped which is a key issue in their oscillations (Fig. 1). <...> Thus a special attention must be paid for the blisk blade parameter, as structural damping is very low as compared with inserted blades, which have natural energy dissipation by a friction in blade securing device (interface) with disk. - Integrally bladed rings (blings) further reduce the overall weight since the inner rim is replaced by a stiff ring. <...> Blings would also be lightly damped by construction. <...> The 3D geometry of rotor blades is such that, in general, the blades don?t experience pure bending or pure torsion oscillations [3]. <...> Instead, torsion and bending oscillations become coupled in each mode of oscillation with varying contributions from each type of deformation. <...> So an induced oscillation mode of rotor 3D geometry blade is called torsion below for brevity. <...> An air flow entering a compressor invariably meets Fig. 1. <...> This results in a static force field that varies <...>