双转子系统动静碰摩动力学研究与基于振动加速度的实验验证

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振动与冲击 ›› 2017, Vol. 36 ›› Issue (14) : 71-76.

论文

王南飞1，蒋东翔1，韩特1,2，徐洪志1

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DYNAMIC STUDY OF RUB-IMPACT OF DUAL-ROTOR SYSTEM AND EXPERIMENTAL VERIFICATION BASED ON VIBRATION ACCELERATION

WANG Nanfei1JIANG Dongxiang1 HAN Te1,2XU Hongzhi1

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摘要

基于航空发动机动静碰摩故障的特点，建立双转子系统动静碰摩的动力学模型。模型中充分考虑机匣与轮盘碰撞时的弹性变形、接触渗透及弹性阻尼支撑，应用Hertz接触理论和库伦模型，建立干摩擦情况下双转子系统动静碰摩故障时的运动微分方程。运用四阶经典Runge-Kutta法进行求解，得到碰摩故障下双转子系统的动力学响应。因为实际的航空发动机转子的振动位移不易获取，多是测得轴承座或者机匣的振动加速度，本文为了提取碰摩状态下轴承座振动加速度特征，建立双转子系统试验台，进行动静碰摩实验，从轴承座测量振动加速度，通过频谱分析和包络谱分析方法，分析了轴承座振动加速度信号中的碰摩特征。结果表明双转子系统动静碰摩时，可将两个激励源的倍频和组合频率成分作为航空发动机动静碰摩故障的典型特征。而且当两个振源的频率值相互接近到20%的时候，双转子系统拍振信号强度较大。动力学仿真和实验取得了很好的一致性，验证了所提出的双转子系统碰摩模型的正确有效性。

Abstract

Based on the rub-impact characteristics of aero-engine, the dynamic model of dual-rotor system with rub-impact is established.The elastic deformation, contact penetration and elastic damping support during rub-impact occurred between the casing and wheel disk are fully considered. A finite element model and its boundary conditions of quayside gantry crane are established in this paper.Collision force and friction are calculated by utilizing Hertz contact theory and Coulomb model, then kinetic differential equations of rub-impact under dry rubbing status is derived. The first ten natural frequencies, the corresponding mode shapes and time-history of displacement response are given based on the analysis of the modes and dynamic response of this gantry crane system. The calculation and analysis above may be helpful for preventing the gantry crane from working on resonant area and for keeping the oversize dynamic deformation under restraint, which can be applied to design quayside gantry crane systems.Applying the variable step size fourth order Runge-Kutta method, rub response of dual-rotor system is obtained. As for aero-engine, it may not be accessible to directly obtain the displacement signal, only to acquire the acceleration signal. In order to extract the bearing pedestal acceleration vibration characteristics under rub-impact status, dual-rotor system test rig is designed. The rub-impact experiments are carried out and the vibration acceleration signals collected from bearing pedestal are analyzed by means of frequency spectrum and envelop analysis methods in order to extract the rubbing faults’ characteristics. The results that frequency doubling and multiple frequency from two different exciting sources can be considered as typical characteristics of rub-impact in aero-engine. The beat vibration usually becomes noticeable when the speed difference of the dual-rotor speed is less than 20% of the operating speed. Dynamic simulation are in accordance with the experiments to verify the effectiveness of the proposed rub-impact model of dual-rotor system.

导出引用

王南飞1，蒋东翔1，韩特1,2，徐洪志1. 双转子系统动静碰摩动力学研究与基于振动加速度的实验验证[J]. 振动与冲击, 2017, 36(14): 71-76

WANG Nanfei1JIANG Dongxiang1 HAN Te1,2XU Hongzhi1. DYNAMIC STUDY OF RUB-IMPACT OF DUAL-ROTOR SYSTEM AND EXPERIMENTAL VERIFICATION BASED ON VIBRATION ACCELERATION[J]. Journal of Vibration and Shock, 2017, 36(14): 71-76

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