燃油调节器壳体裂纹失效分析

针对某型燃油调节器壳体裂纹故障提出一种分析定位方法。通过实物质量分析、光谱分析和ANSYS结构强度仿真,排除材料缺陷和设计缺陷,将故障问题逐渐收敛定位于外部载荷环境的影响,结合断口和疲劳试验载荷谱利用裂纹疲劳弧线反推分析萌生裂纹机理,采用列表梯形法计算出壳体裂纹萌生寿命,将故障分析定位在高周疲劳试验区间。根据高周疲劳寿命试验数据进行频谱扫描,分析高周疲劳试车中发动机转速频率特性、燃油调节器固有频率,并统计试车累计工作时间。结果表明:外部激励频率与燃油调节器的固有频率存在频率上的重合导致了共振失效。为燃油调节器裂纹故障的分析定位提供了思路和方法,可为航空发动机控制体系的发展与研究提供技术支持。

Crack Failure Analysis of Fuel Regulator Shell

Aiming at the crack fault of a fuel regulator shell,an analysis and location method was proposed.Firstly,the physical quality was analyzed,the material defects and design defects were eliminated through spectral analysis and ANSYS structural strength simulation,and the fault problem gradually converged to the influence of external load environment.Then,combined with the fracture and fatigue test load spectrum,the crack initiation mechanism was analyzed by using the crack fatigue arc,and the shell crack initiation life was calculated by the list ladder method.The fault analysis was located in the high cycle fatigue test range.The frequency spectrum was scanned according to the high cycle fatigue life test data,the frequency characteristics of engine speed and the natural frequency of fuel regulator in high cycle fatigue test were analyzed,and the cumulative working time of test run was counted.The results show that the coincidence of the external excitation frequency and the natural frequency of the fuel regulator is the problem leading to resonance failure,which provides ideas and methods for the analysis and location of the fuel regulator crack fault,and provides technical support for the development and research of aeroengine control system.