航空用空气涡轮起动机涡轮动力学特性分析

Dynamic Characteristics Analysis of Turbine Rotor of Aviation Air Turbine Starter

涡轮作为空气涡轮起动机的最核心组件,其动力学特性影响整个起动机。通过有限元商用软件建立空气涡轮起动机整机有限元模型。减速系统中的双联齿轮部件被等效简化为两个质点间的弹簧连接,弹簧的刚度等于通过威伯-班纳斯切克模型计算得到的齿轮啮合刚度。基于起动机模型进行涡轮临界转速计算和不平衡响应分析,得知该型空气涡轮起动机在加速阶段会经历涡轮两阶临界转速,并确定实际不平衡量激励下的响应大小,为涡轮优化设计以及振动控制提供技术依据。

Turbine is the core component of the air turbine starter,and its dynamic characteristics affect the entire starter.A whole-machine finite element model of the air turbine starter is established through commercial finite element software.The duplex gear component in the reduction system is equivalently simplified to the spring connection between two particles,whose stiffness is equal to the meshing stiffness of the gear calculated by the Weber-bannaschck model.Based on the starter model,the turbine critical speed calculation and unbalance response analysis are conducted to obtain the two-stage critical speed the air turbine starterp during the acceleration stage and determine the response scale excited under the actual unbalanced amount,thereby providing technical basis for turbo optimization design and vibration control.