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首页> 外文期刊>Journal of Sound and Vibration >Rotordynamic analysis of asymmetric turbofan rotor due to fan blade-loss event with contact-impact rub loads
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Rotordynamic analysis of asymmetric turbofan rotor due to fan blade-loss event with contact-impact rub loads

机译：带有接触碰撞摩擦载荷的风扇叶片损失事件引起的非对称涡轮风扇转子的转子动力学分析

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摘要

Loss of a blade from a running turbofan rotor introduces not only huge imbalance into the dynamical system rather it makes the entire rotor asymmetric as well. In a nonsymmetric rotor, the various terms of mass, gyroscopic and stiffness matrices also become time-dependent. In this paper, all the dynamical equations include the effect of the rotary inertia and gyroscopic moments as a result of both shaft bending as well as staggered blades flexing in-and-out of the plane of the disk. The governing equations also account for internal material damping in the shaft and the external damping in the support bearing system. In addition to the unbalance load at the disk location, the shaft may also be subjected to a torque and axial forces. Here, the fan blades are modeled as pre-twisted thin shallow shells. They have coupled flexural-torsional motion in the lateral out-of-plane direction as well as extensional degrees-of-freedom in the longitudinal spanwise direction of the blade airfoil. The effect of blade tip rub forces being transmitted to the shaft are analyzed in terms of the dynamic stability of the rotor, especially during windmilling.
机译：运行中的涡轮风扇转子失去叶片，不仅会给动力系统带来巨大的不平衡，还会使整个转子不对称。在非对称转子中，质量，陀螺仪和刚度矩阵的各种术语也与时间有关。在本文中，所有动力学方程都包括由于轴弯曲以及交错的叶片在磁盘平面内外弯曲而产生的旋转惯性和陀螺力矩的影响。控制方程还考虑了轴中的内部材料阻尼和支撑轴承系统中的外部阻尼。除了在磁盘位置的不平衡负载外，轴还可能承受扭矩和轴向力。在这里，风扇叶片被建模为预扭曲的薄浅壳。它们在叶片翼型的横向平面外方向上耦合了挠曲扭转运动，并且在纵向翼展方向上耦合了伸展自由度。根据转子的动态稳定性，尤其是在风车过程中，分析了叶片尖端摩擦力传递给轴的影响。

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