航空发动机承力结构系统阻尼减振设计方法

针对典型高推质比涡扇发动机承力结构系统,提出了干摩擦阻尼减振的结构振动控制方法:在不损失支承刚度的前提下,于承力结构上设计具有动力吸振作用的干摩擦阻尼器,增强转子支承结构系统在宽频域内的阻尼特性,实现在工作转速频率内对承力结构振动响应的有效控制。通过理论分析和仿真计算,确定了干摩擦阻尼器结构特征及摩擦接触条件对减振效果的影响规律，并提出了承力结构阻尼减振的设计思路与流程。结果表明:干摩擦阻尼器可通过接触摩擦消耗承力框架的振动能量，合理设计阻尼器的摩擦因数和爪宽将进一步优化减振效果，算例中轴承座局部共振幅值衰减超过1个量级。 

Damping design technology of aero-engine supporting structure system

The vibration control method with dry friction damping was put forward for the supporting structure system in high thrust-mass ratio turbofan engine. A dry friction damper with vibration absorption function was designed to enhance the damping characteristic of the supporting structure without loss of stiffness, and achieve vibration response control for the system. Influences of friction contact characteristic and dry friction damper structure characteristic on the damping effect were acquired in theoretical analysis and simulation calculation, and the damping design flow for supporting structure was presented. Results exhibited that vibration response was attenuated with the dry friction damper, and the damping effect could be optimized with reasonable design of friction coefficients and claw''s width, which helped attenuate resonance amplitude of bearing house by more than one order in the example.