考虑机翼柔性影响的发动机安装系统隔振设计研究

目的研究综合考虑安装系统的隔振效率、振型解耦、机翼柔性等因素影响的涡桨发动机安装系统隔振设计方法。方法首先对二自由度系统的动力学特性进行理论推导,得出机翼柔性在安装系统隔振分析中的重要性。进一步将弹性中心理论应用于发动机安装系统设计中,获得双平面五点式安装系统主要设计变量的优选参数。为分析柔性机翼对该设计过程的影响,利用有限元和多体动力学方法建立安装系统的刚柔混合计算模型,并进行分析。结果机翼阻尼对高频共振响应影响较大,垂向刚度比大于2时,安装系统取得较好的减振效果。结论综合考虑机翼柔性及振动解耦等因素的发动机安装系统隔振设计方法可以为航空发动机安装系统的工程设计提供参考。

Vibration Isolation Design of Engine Installation System Considering the Influence of Wing Flexibility

Objective To research the design method of vibration isolation system for turboprop engine installation system under the influences of many factors such as vibration isolation efficiency, vibration mode decoupling and wing flexibility. Methods Firstly, the dynamic characteristics of the two-degree-of-freedom system were theoretically derived, and the importance of the wing flexibility in the vibration isolation analysis of the installation system was obtained. Furthermore, the elastic center theory was applied to the design of engine installation system, and the optimal parameters of the main design variables of the two-plane five-point installation system were obtained. To analyze the influence of the flexible wing on the design process, the finite element method and multi-body dynamics method were used to establish a rigid-flexible hybrid calculation model of the installation system for analysis. Results The damping of the wing had a great influence on the resonance response of the high frequency. Good vibration damping effect can be realized when the vertical stiffness ratio was higher than 2. Conclusion The vibration isolation design method of the mounting system considering wing vibration damping effect and vibration mode decoupling could provide scientific basis for the engineering design of aeroengine mounting system.