Study on vibration characteristics of fan shaft of geared turbofan engine with sudden imbalance caused by blade off
Study on vibration characteristics of fan shaft of geared turbofan engine with sudden imbalance caused by blade off
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DOI：
10.1115/1.4039246
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发表时间：
2018-08
期刊：
影响因子：
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通讯作者：
Jing-hua Wei;Bai Peixin;D. Qin;T. Lim;Pan Yang;Hong Zhang
中科院分区：
文献类型：
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作者：
Jing-hua Wei;Bai Peixin;D. Qin;T. Lim;Pan Yang;Hong Zhang
根据齿轮传动涡扇发动机动力学设计的要求，对风扇轴的振动特性进行了研究。动力学模型充分考虑了叶片脱落引起的突然不平衡、时变啮合刚度和啮合误差对振动特性的影响。采用考虑剪切变形影响的改进Euler-Bernoulli梁单元，建立齿轮-轴-轴承-机匣的耦合关系。在单叶片完全失稳的风车工况下，比较了带齿轮箱和不带齿轮箱的涡扇发动机风扇轴的振动特性。研究了不同转速下齿轮系统对风机轴振动的影响。结果表明，带齿轮箱系统的涡扇发动机风扇轴心轨迹为多频涡动运动，存在稳定的极限环。风车工况下，啮合频率与模态频率有多个交点。GTF发动机变速箱的临界转速较密集，瞬态振动峰值随转速的增加呈波浪形上升。研究结果可为GTF发动机的参数设计和优化提供参考。
Based on the requirements of the dynamic design of geared turbofan (GTF) engines, the vibration characteristic of the fan shaft is investigated. The effect of sudden imbalance caused by blade off, the time-varying meshing stiffness, and meshing errors on the vibration characteristics is fully considered in the dynamic model. The improved Euler–Bernoulli beam element considering the effects of shear deformation is employed and a coupled relationship between the gear–shaft–bearing–casing is established. Under windmilling condition with a single blade completely lost, the vibration characteristics of the fan shaft of the turbofan engine with and without a gearbox system are compared. The effect of the gear system on the vibration of the fan shaft under different rotating speeds is examined. The results show that the orbit of the fan shaft center in the turbofan engine with the gearbox system exhibits a multifrequency whirling motion and has a stable limit cycle. Under windmilling condition, the meshing frequency and the modal frequency have multiple intersection points. The critical speed is dense and the peak value of the transient vibration of the GTF engine gearbox shows a wave rise with an increase in speed. The results of this study could provide a reference for the parameter design and optimization of GTF engines.