基于“陀螺动能”的反向旋转临界转速主动识别方法

Active Identification Method of Counter-rotating Critical Speeds Based on “Gyroscopic Kinetic Energy”

中文关键词:  临界转速  主动识别  反向旋转  双转子-支承系统  陀螺动能  转子动力学  航空发动机

英文关键词:critical speed  active identification  counter rotating  dual-rotor-bearing system  gyroscopic kinetic energy  rotor dynam⁃ ics  aeroengine

中文摘要:

      为了识别航空发动机反向旋转双转子-支承系统的临界转速，采用有限元法建立了带有中介支承的反向旋转双转子-支 承系统模型。通过对该模型进行动力学计算分析，深入了解其内部运动机理。采用能量法和“陀螺动能”计算分析，发现了反向旋 转双转子-支承系统的运动规律并识别出临界转速，通过不平衡响应计算验证了识别方法的正确性。结果表明：转子“陀螺动能” 的大小与临界转速的分布密切相关，采用基于“陀螺动能”识别临界转速的方法可用于识别反向旋转双转子-支承系统的临界转 速。该识别方法将传统的人工识别转变为算法主动识别，可为航空发动机动力学设计和优化提供参考。该识别方法不仅适用于 反向旋转双转子-支承系统，还可推广至同向旋转等其他转子-支承系统的动力学分析和临界转速识别。

英文摘要:

      In order to identify the critical speeds of the counter-rotating dual-rotor-bearing system in an aeroengine, a finite element model of such a system with an inter-shaft bearing was established. Dynamic analysis of the model provided insights into the internal motion mechanisms. By using energy method analysis and calculation of "gyroscopic kinetic energy", the motion patterns of the counter- rotating dual-rotor system were discovered and critical speeds were identified. The validity of the identification approach was verified through unbalance response analysis. The results show that the magnitude of "gyroscopic kinetic energy" of the rotors is closely related to the distribution of critical speeds. The method of identifying critical speed based on "gyroscopic kinetic energy" can be used to identify the critical speeds of counter-rotating dual-rotor-bearing systems. The method transforms the traditional manual identification method into an algorithmic active identification, providing a reference for aeroengine dynamics design and optimization. The identification method is not only applicable to counter-rotating dual-rotor systems but also can be extended to the dynamic analysis and critical speed identification of other types of rotor-bearing systems including co-rotating ones.