| Citation: | HONG Jie, SHEN Yupeng, WANG Yongfeng, et al. Robust design method for mechanical characteristics of power turbine rotor structural system[J]. Journal of Beijing University of Aeronautics and Astronautics, 2019, 45(3): 437-445. doi: 10.13700/j.bh.1001-5965.2018.0406(in Chinese)
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The power turbine rotor of aero turbojet engine and turboprop engine is a typical high-speed flexible rotor structural system with multi-support, connecting interface and uneven mass/stiffness distribution. The dispersity of mechanical characteristics of joint structure and bearing stiffness can cause the dynamic cha-racteristics of the rotor structural system to deteriorate. According to the typical power turbine rotor structural system, it is pointed out that the interface contact damage, such as non-recoverable slip, fatigue and friction, is the intrinsic reason for the dispersity of the mechanical properties of the connecting structure, and the quantitative evaluation parameters including contact state coefficient, contact stress, non-recoverable deformation energy and contact friction work are put forward. Based on the analysis of the critical speed distribution of multi-support flexible rotor-bearing system and its influence on the stiffness sensitivity of each support, a robust design method of dynamic characteristics based on the selection of the low-sensitivity region of support stiffness is proposed, which improves the robustness of the rotor structure system.
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