【作者】 谢海龙； 魏大盛；

【Author】 XIE Hai-long;Wei Da-sheng;School of Energy and Power Engineering,Beijing University of Aeronautics and Astronautics;

【机构】 北京航空航天大学能源与动力工程学院；

【摘要】 转子系统是航空发动机的核心部件,是发动机振动的主要机械激振源,深入研究航空发动机转子动力学问题,将为高速旋转转子的优化设计提供理论技术支持。本文针对某小型航空发动机单转子结构的特征,建立了转子系统动力学有限元模型,采用了简化建模的方法。由建立的三维简化模型对转子系统的固有特性进行计算和分析。将计算结果与传统计算方法结果进行比较,表明简化方法满足精度要求。重点分析了支承刚度和陀螺力矩对临界转速和振型的影响规律,结果表明随支承刚度增加,转子各阶临界转速增加且转子振型也发生了改变,1号支点支承刚度保持在1×10~6N/m以下,2号支点支承刚度保持在1×10~5N/m以下时转子性能较好;陀螺力矩在轮盘摆动振型下影响明显。更多还原

【Abstract】 The rotor system is the core component of the engine and is the main source of engine vibration. Researching the aeroengine rotor dynamics provides theoretical support for the optimal design of high-speed rotating rotors. In this paper,based on the structural characteristics of a small aeroengine rotor, a finite element model of rotor dynamics is established, and the method for modeling the simplified model is described in detail. The intrinsic characteristics of the small engine rotor system were calculated and analyzed using a three-dimensional model. Comparing the calculation results with the results obtained by the traditional calculation method shows that the simplified method satisfies the accuracy requirements. The influence of supporting stiffness and gyro moment on the critical speed and mode shape is analyzed.The results show that as the stiffness of the bearing increases, the critical speed of each stage of the rotor increases and the mode shape of the rotor changes, and the rotor performance is better when the support stiffness of No. 1 fulcrum remains below 1×10~6 N/m and the No.2 fulcrum remains below 1×10~5 N/m. The gyro torque has a significant effect on the oscillation mode of the disk.更多还原