带金属软管的航空发动机管路振动特性分析

Analysis on Vibration Characteristics of Aero-engine Pipeline With Metal Hose

为提高大管径、长跨度航空发动机管路的工作可靠性,将管路中间部位增加一段金属软管,用于补偿制造偏差、安装误差和热膨胀。为达到管路结构动力学的设计要求,避免管路的破坏与失效,对带金属软管的航空发动机管路进行有限元建模、频率计算与分析,通过增加卡箍及调整卡箍位置使管路的低阶频率满足国军标要求,并通过功率谱分析说明加卡箍后管路的振动应力显著降低,证明该方案的可行性,满足管路结构动力学的设计要求。

In order to improve the reliability of aero-engine pipeline,a metal hose is added to the middle part of the pipeline to compensate for manufacturing deviation,installation error and thermal expansion.In order to meet the design requirements of pipeline structural dynamics and avoid pipeline damage and failure,finite element modeling,frequency calculation and analysis of aero-engine pipeline with metal hose are carried out.By increasing the hoop and adjusting the hoop position to frequency modulation,the low order frequency of pipeline meets the requirements of GJB.and the power spectrum analysis shows that the vibration stress of the clamped pipeline is significantly reduced,which verifies the feasibility of the Scheme.