Bearing dynamic load control method for high speed flexible rotor system of GTF engine
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摘要:
针对齿轮驱动涡扇（geared turbofan，GTF）发动机高速柔性转子系统，建立力学模型与有限元模型，在分析支点动载荷组成与特征的基础上，提出临界转速支点动载荷控制方法与模态振型控制评估参数。通过控制临界转速模态振型中大质量惯性部件角向模态位移，降低转子对惯性主轴倾斜旋转惯性激励敏感度，以及控制弯曲振型节点位置靠近支点，实现高速柔性转子弯曲振型临界转速下支点动载荷控制。结果表明，通过在低压涡轮采用双支点布局，以及优化低压压气机轴颈刚度，可实现上述临界转速模态振型有效控制，转子弯曲振型临界转速下支点动载荷可降低约14%～65%，验证了本文方法有效性。
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关键词:
- GTF发动机 /
- 高速柔性转子 /
- 不平衡响应 /
- 支点动载荷 /
- 临界转速模态振型控制
Abstract:The mechanical model and finite element model of the high speed flexible rotor system of GTF (geared turbofan) engine were established. Based on analysis of the composition and characteristics of bearing dynamic load, the critical speed bearing dynamic load control method and modal shape control evaluation parameters were proposed. In this method, the angular motion of the large inertial component in the critical speed modal shape was controlled, the sensitivity of the rotor to couple unbalance excitation was reduced, and the node position of the bending modal shape was controlled close to the bearing, so as to realize the bearing dynamic load control under the lateral bending critical speeds of the high speed flexible rotor system. The results showed that the above critical speed modal shape control can be achieved by adopting the double supporting layout around the low-pressure turbine and optimizing the conical shell stiffness of the low-pressure compressor. The effectiveness of bearing dynamic load control method was verified by the 14% − 65% reduction of bearing dynamic load under the lateral bending critical speeds.
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图 1 典型GTF发动机高速柔性转子系统结构简图
Figure 1. Schematic diagram of high speed flexible rotor system of typical GTF engine
图 2 GTF发动机高速柔性转子系统动力学模型
Figure 2. Dynamic model of high speed flexible rotor system of GTF engine
图 3 GTF发动机高速柔性转子系统有限元模型
Figure 3. Finite element model of high speed flexible rotor system of GTF engine
图 4 GTF发动机高速柔性转子系统Campbell图
Figure 4. Campbell diagram of high speed flexible rotor system of GTF engine
图 5 GTF发动机高速柔性转子系统临界转速模态振型
Figure 5. Critical speed mode shapes of high speed flexible rotor system of GTF engine
图 6 转子系统各阶临界转速应变能分布
Figure 6. Strain energy distribution at each critical speed of rotor system
图 8 GTF发动机高速柔性转子系统支点动载荷幅频曲线
Figure 8. Amplitude frequency curve of bearing dynamic load of high speed flexible rotor system of GTF engine
图 9 GTF发动机高速柔性转子系统支点位置（增加3#支点）
Figure 9. Support location of high speed flexible rotor system of GTF engine (adding 3# support)
图 10 GTF发动机高速柔性转子系统支点动载荷（增加3#支点）
Figure 10. Bearing dynamic load of high speed flexible rotor system of GTF engine (adding 3# support)
图 11 转子临界转速弹性线对比（增加3#支点）
Figure 11. Comparison of elastic line of rotor critical speed (adding 3# support)
图 12 低压涡轮俯仰因子对比（增加3#支点）
Figure 12. Comparison of CIF of low pressure turbine （adding 3# support）
图 13 压气机轴颈刚度变化对临界转速模态影响
Figure 13. Influence of compressor rear shaft stiffness on rotor critical speed mode
图 14 GTF发动机高速柔性转子系统支点动载荷（改变轴颈刚度）
Figure 14. Bearing dynamic load of high speed flexible rotor system of GTF engine (changing rear shaft stiffness)
表 2 GTF发动机高速柔性转子系统各阶临界转速
Table 2. Critical speed of high speed flexible rotor system of GTF engine
临界转速阶次 临界转速数值/（r/min） CrSP1 2710 CrSP2 4802 CrSP3 6697 CrSP4 15912 
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