摘要
为优化带共用支承结构双转子系统的不平衡响应特性,使其在同等不平衡量下能够在较大的转速范围内稳定运行,提出了一种适用于带共用支承结构双转子系统的振能转移优化设计方法,并对双转子系统的模型进行了有限元动力学特性计算和动力学优化设计。优化后,该模型在各阶自激励模态下的可容度均超过0.8,能够满足可容模态设计要求。以某涡轴发动机为参考对象,设计并加工了一套带共用支承结构的双转子实验器,该实验器能够模拟4种不同刚度下带共用支承结构双转子系统的动力学特性。使用该实验器进行了动力学特性计算验证实验,在4种刚度组合下,该实验器在各阶自激励模态下临界转速的误差均不大于7%,这表明建立的带共用支承结构双转子系统的模型是准确的。使用该实验器进行了不平衡响应峰值对比实验和抗振特性对比实验,与优化前的刚度组合相比,在最优的刚度组合下,动力涡轮的不平衡响应峰值降低了51.49%,最大许用不平衡量提升了79.21%,这说明振能转移优化设计对于降低动力涡轮的不平衡响应和提升动力涡轮的抗振特性效果显著。分别对振能转移优化前和振能转移优化后的实验器进行了长时间“共振”实验,优化前的实验器无法在临界转速处长时间运行,不满足可容模态设计要求,而对于优化后的实验器,动力涡轮在其自激励一阶模态临界转速处长时间运行时的不平衡响应增幅为5.37%,燃气发生器在其自激励一阶模态临界转速处长时间运行时的不平衡响应增幅为1.39%,能够满足可容模态设计要求。
In order to optimize the unbalanced response characteristics of the dual-rotor system with mid turbine frame and make it operate stably in a wide range of rotational speeds under the same unbalance,an optimization design method of vibration energy transmission for the dual-rotor system with mid turbine frame was proposed,the finite element dynamic characteristics calculation and dynamic optimization design of the dual-rotor system model were carried out.After optimization,the acceptability of the model under self-excitation modes exceeds 0.8,which can meet the design requirements of acceptable mode.Taking a turboshaft engine as the reference object,a set of dual-rotor experimental device with mid turbine frame was designed and processed,which can simulate the dynamic characteristics of the dual-rotor system with mid turbine frame under four different stiffnesses.The dynamic characteristic calculation verification test was carried out by using the experimental device.Under the four stiffness combinations,the error of critical speed of the experimental device under self-excitation modes is not more than 7%,which indicates that the established model of the dual-rotor system with mid turbine frame is accurate.The unbalanced response peak comparison test and the anti-vibration characteristic comparison test were carried out by using the experimental device.Compared with the stiffness combination before optimization,under the optimal stiffness combination,the unbalanced response peak of power turbine decreased by 51.49%,and the maximum allowable unbalance increased by 79.21%,which shows that the vibration energy transmission optimization design has a significant effect on reducing the unbalanced response of power turbine and improving the anti-vibration characteristics of power turbine.The long time‘resonance’experiment was carried out on the experimental device before and after the optimization of vibration energy transmission.The experimental device before optimization could not run for a long time at critical speed,which could not meet the design requirements of acceptable mode.For the optimized experimental device,the unbalanced response of power turbine at critical speed of its self-excitation 1st mode increased by 5.37%,and the unbalanced response of gas generator at critical speed of its self-excitation 1st mode increased by 1.39%,which could meet the design requirements of acceptable mode.
作者
高永强
刘准
廖明夫
陈忠斌
GAO Yongqiang;LIU Zhun;LIAO Mingfu;CHEN Zhongbin(College of Power and Energy,Northwestern Polytechnical University,Xi’an 710129,China)
出处
《推进技术》
北大核心
2025年第5期287-298,共12页
Journal of Propulsion Technology
基金
国家科技重大专项。
关键词
涡轴发动机
共用支承结构
动力学优化设计
振能转移
可容模态
Turboshaft engine
Mid turbine frame
Dynamics optimization design
Vibration energy transmission
Acceptable mode
