某型发动机测量耙结构损伤分析及优化设计

Structural Damage Analysis and Optimal Design of a Certain Type of Engine Measuring Rake

针对某型号发动机进气道测量耙振动试验过程中出现的根部结构损伤问题,分别进行了数值仿真和试验研究,分析得到主要原因为:测量耙设计强度不足,固有频率与发动机转子频率重合产生共振。针对上述问题,对测量耙结构进行优化和改进,并通过数值仿真和环境试验的方法对优化后的测量耙进行分析,发现其固有频率从141.0 Hz提高至203.98 Hz,成功避开发动机转动频率;静应力和随机振动应力显著降低,证明了改进后的测量耙满足某型发动机装机飞行试验的要求。

Aiming at the root damage problem of a certain type of aero-engine intake measuring rake during the vibration tests,the numerical and experimental research are carried out respectively in this paper.The main reason obtained by the analysis is that the design strength of the rake is insufficient,and the resonance occurs when the natural frequency of the rake coincides with the aero-engine rotors.In response of the above problem,the structure of the rake is optimized and improved,and the optimized rake is analyzed through numerical simulation and environmental tests.It is found that its natural frequency is increased from 141.0 Hz to 203.98 Hz,which would successfully avoid the rotation frequency of aero-engine.The static stress and the random vibration stress are significantly reduced,which proves that the optimized rake meets the requirements of the aero-engine flying test.