基于虚拟样机技术的航空发动机放气活门机构仿真及故障分析

针对某型航空发动机放气活门机构主动摇臂的多起断裂故障,为寻找故障原因并尽可能缩短排故周期与降低排故成本.借助虚拟样机技术建立此机构的动力学仿真模型,利用动力学仿真软件ADAMS与有限元分析软件ANSYS的联合仿真分析,实现放气活门机构摇臂断裂故障再现,并找出断裂件受力的主要影响因素及其影响规律,估算各受力水平下断裂摇臂的疲劳寿命.最终,分别给出保证摇臂最低使用寿命与全寿命使用情况下的改进建议,即将摇臂与放气活门之间间隙B增大至0.273mm与0.279mm,从而为实际工程排故提供理论依据. 

Simulation and failure analysis of aircraft engine's bleed valve mechanism based on virtual prototyping technology

For many rocker fractures of a certain type of aircraft engine's bleed valve mechanism, a dynamic model of the mechanism was built in order to obtain the fault reason and reduce the time and cost of the troubleshooting. The fault recurrence of the mechanism was implemented based on virtual prototyping technology by ADAMS and ANSYS software. The influence factor and law of fractured component's stress was found out, and the fatigue life of some stress levels was estimated. Finally, improvement proposals for increasing the gap B to 0.273mm and 0.279mm to ensure the rocker's shortest life and whole life were given respectively. Thus, the basis for the troubleshooting in engineering was provided.