航空发动机承力结构隔振设计方法及试验

Based on the structural and dynamic characteristics of advanced aero-engine supporting frames, the design method of high vibration isolation supporting frames is verified by theoretical analysis and simulation calculation. The structural mechanical impedance in wide frequency band is increased and high vibration isolation within rotor working speed range is achieved by the optimized design of stiffness/mass distribution and configuration break in supporting structure. According to the effect of structural stiffness/mass distribution on vibration isolation, the rotor-supporting frame experimental apparatus is designed and established in folded discrete structure, and the high vibration isolation supporting frame design method is further verified by the experiment. The experimental results show that the discrete design in supporting structure possesses good vibration isolation effect to the excitation on different bearing positions in wide frequency band.