Vibration coupling mechanism and response characteristics of shared support dual-rotor system
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摘要:
针对带有涡轮级间共用承力框架的双转子系统，采用机械阻抗理论定量描述结构质量/刚度分布特征，建立了复杂转子系统振动耦合机理模型，并提出了针对共用支承-双转子系统的振动耦合点确定方法，以及交互激励瞬态响应仿真方法。仿真结果表明：共用支承-双转子系统振动耦合的力学本质，是转子与支承结构振动交互作用下的动力响应耦合，既包括共用支承结构振动基础激励带来的振动耦合力学行为，又包括多转子交互激励下多频率组合的振动响应耦合力学行为。其中基础激励下耦合程度与支承机械阻抗及转子振型有关，转子间交互激励下耦合程度则受被激转子模态振型影响，被激转子刚体模态振型对基础振动敏感，在激励转子作用下更易产生转子交互激励下振动耦合。
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关键词:
- 共用支承-双转子系统 /
- 振动耦合 /
- 响应特性 /
- 基础振动 /
- 交互激励
Abstract:For the dual-rotor system with mid turbine frame, the mechanical impedance theory was used to quantify the structural mass/stiffness distribution characteristics, and the vibration coupling mechanism model of complex rotor system was established, then the vibration coupling point determination and interactive excitation transient response simulation methods for shared support dual-rotor system were proposed. The simulation results showed that the mechanical essence of shared support dual-rotor system vibration coupling lied in the dynamic response coupling under the vibration interaction between rotor and support structure, including vibration coupling mechanical behavior caused by foundational vibration of shared support structure as well as interaction excitation of multiple rotors. Vibration coupling level under foundational excitation was related to support mechanical impedance and rotor mode shape, and the vibration coupling level under rotor interaction excitation was affected by excited rotor mode shape. The rigid body mode shape of excited rotor was sensitive to foundation vibration, making it easier to produce rotor interaction excitation vibration coupling under excitation of another rotor.
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图 1 典型共用支承-双转子系统结构简图
Figure 1. Schematic diagram of typical shared support-dual rotor system
图 2 共用支承-双转子系统振动耦合机理模型
Figure 2. Vibration coupling mechanism model of shared support-dual rotor system
图 3 共用支承-双转子系统振动耦合点确定思路
Figure 3. Vibration coupling point judgment and analysis strategy of shared support-dual rotor system
图 4 共用支承-双转子系统有限元模型
Figure 4. Finite element model of shared support-dual rotor system
图 5 共用支承-双转子系统Campbell图
Figure 5. Campbell diagram of shared support-dual rotor system
图 6 共用支承-双转子系统潜在振动耦合点模态振型
Figure 6. Potential vibration coupling point mode shapes of shared support-dual rotor system
图 11 轴心轨迹及支点动载荷（HPX-2阶点）
Figure 11. Shaft orbit and dynamic load of bearing （point HPX-2）
图 14 轴心轨迹及支点动载荷（HPX-3阶点）
Figure 14. Shaft orbit and dynamic load of bearing （point HPX-3）
图 17 轴心轨迹及支点动载荷（LPX-A点）
Figure 17. Shaft orbit and dynamic load of bearing （point LPX-A）
图 20 轴心轨迹及支点动载荷（HPX-B点）
Figure 20. Shaft obirt and dynamic load of bearing（point HPX-B）
表 1 共用支承-双转子系统潜在振动耦合点转速
Table 1. Potential vibration coupling point speed of shared support-dual rotor system
振动耦合点 高压转速/（r/min） 低压转速/（r/min） HPX-2阶 5951 2850 HPX-3阶 16213 11996 LPX-A点 11166 6737 HPX-B点 9066 4342 
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