风扇叶片丢失激励下转子-支承系统结构安全性设计策略

发布时间：2018-05-07 17:01

本文选题：叶片丢失 + 风扇转子　；参考：《航空动力学报》2016年11期

【摘要】：以高涵道比涡扇发动机风扇叶片丢失载荷激励下的转子-支承系统为研究对象,提出了一套结构安全性设计策略,即通过支承方案与载荷分配、变刚度支承结构和支承结构变形控制,结合转子结构动力学特性设计,实现转子结构安全性设计.研究表明:风扇后支点采用变刚度支承结构设计,能够在转子减速停车过程中减小风扇局部振动临界转速与相应振幅.通过设计滚珠轴承支承锥壳锥角,能够使支承具有较高的轴向承载能力并减小转轴变形对滚珠轴承的影响.轴承座底部与转轴间采用鼓形配合面连接设计,能够在大弯矩作用下通过配合面相互滑移避免支承随转轴变形,保证轴承安全.研究结果可为恶劣载荷作用下高涵道比涡扇发动机结构安全性设计提供依据.
[Abstract]:Taking the rotor-bearing system of high culvert ratio turbofan engine fan blade under the excitation of lost load as the research object, a set of structural safety design strategy is proposed, that is, through the support scheme and load distribution. Variable stiffness supporting structure and supporting structure deformation control, combined with rotor structure dynamic characteristics design, the rotor structure security design. The results show that the variable stiffness supporting structure is used to design the rear fulcrum of the fan, which can reduce the critical speed and the corresponding amplitude of the local vibration of the fan during the deceleration and stopping of the rotor. By designing the cone angle of ball bearing supporting cone shell, it can make the bearing have higher axial bearing capacity and reduce the influence of shaft deformation on ball bearing. The joint design between the base of the bearing and the shaft can avoid the deformation of the bearing with the shaft and ensure the safety of the bearing by the slip of the matching surface under the action of large bending moment. The results can provide basis for structural safety design of high culvert ratio turbofan engine under bad load.
【作者单位】：北京航空航天大学能源与动力工程学院;先进航空发动机协同创新中心;中国航空发动机集团有限公司沈阳发动机研究所;
【分类号】：V235.13

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