FBO激励下含熔断结构转子动力学特性试验研究  

Test study on dynamic characteristics of rotor with fuse structure under FBO excitation

作　　者：褚雯楠 何泽侃 宣海军[1] CHU Wennan;HE Zekan;XUAN Haijun(College of Energy Engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学能源工程学院,杭州310027

出　　处：《振动与冲击》2025年第3期301-308,共8页Journal of Vibration and Shock

摘　　要：为研究风扇叶片丢失(fan blade off,FBO)后含熔断结构转子系统的动力学响应特征,基于相似理论设计了一套与真实大涵道比涡扇发动机低压转子结构跨距比一致、动力学特性相似的缩尺模拟转子;设计了一种带减薄段和削弱孔的锥壁熔断结构,通过有限元分析确定了其失效阈值范围,在卧式高速旋转试验台上开展了FBO激励下含熔断结构的转子动力学特性试验研究。结果表明:熔断结构失效后模拟转子的一阶、二阶临界转速数值分别下降了30.4%、3.0%,与FBO的响应峰值数据相比,2#轴承座与前支座的冲击振动响应对于熔断结构失效更为敏感,且在转子降速时,5#轴承座的振动响应对一阶和二阶临界转速敏感程度近似,转子的大不平衡载荷有较大部分通过2#支点传递到外部。Here,to study dynamic response characteristics of a rotor system with a fuse structure after fan blade off(FBO),a scaled simulation rotor was designed based on similarity theory,it could have the same span ratio and similar dynamic characteristics as those of low-pressure rotor structure of a real large bypass ratio turbofan engine.A conical wall fuse structure with thinning sections and weakening holes was designed,and its failure threshold range was determined through finite element analysis.Test study on dynamic characteristics of rotor with fuse structure under FBO excitation was conducted on a horizontal high-speed rotating test platform.The results showed that after failure of fuse structure,the first and second critical rotating speed values of the simulated rotor decrease by 30.4%and 3.0%,respectively;compared with their peak response data to FBO,shock vibration responses of 2#bearing pedestal and front support are more sensitive to failure of fuse structure;when rotor rotating speed drops,the sensitivity of vibration response of 5#bearing pedestal to the first critical rotating speed is close to that to the second critical rotating speed;a larger part of large unbalanced load of rotor is transmitted to outside through 2#fulcrum.

关 键 词：扇叶片丢失(FBO) 熔断结构 冲击响应 降速过程 动力学特性 试验研究 

分 类 号：V235.13[航空宇航科学与技术—航空宇航推进理论与工程] V231.96