某型飞机4号油箱结构损伤分析及修复评估

Structure Damage Analysis and Repair Assessment for No.4 Fuel Tank of an Aircraft

目的某型双座机使用中发现4号油箱存在不同程度结构损伤,分析其损伤原因和制定修理方案。方法对4号油箱结构状态进行深入检查评估后,从结构损伤过程、载荷情况、设计制造和外场使用等方面综合分析损伤原因。对实际损伤结构进行强度计算和评估,制定结构损伤补强修理方案,并提出修理改进建议。结果通过分析得出,损伤原因主要是4号油箱局部存在设计制造缺陷,且飞机在作大过载飞行时,4号油箱可能处于满油或大量余油的高负载状态。根据损伤原因制定的修理方案合理可行,通过了静强度校核和评估。结论基于该损伤结构提出的修理方案通过实际修理验证,能够满足油箱结构强度设计要求,提出的改进建议能够改善飞机疲劳品质。

Objective To analyze causes and make repair procedures for structure damages at different levels of No.4 fuel tank found in the use of a two-seater aircraft.Methods After in-depth inspection and evaluation of the No.4 tank structure,the causes of damage were comprehensively analyzed from the structural damage process,load condition,design,manufacture and the use of cracks.The strength of the actual damage structure of the fuel tank was calculated and evaluated to formulate plans for repair of structural damage and propose suggestions on repair improvement.Results According to the analysis,the main cause of the damage was design and manufacturing defects in the No.4 fuel tank.And when the aircraft was in overload flight,the No.4 tank may be in a high-load state with full oil or a large amount of residual oil.The repair producers formulated based on the causes of damage passed the static strength check and evaluation and were verified of feasibility.Conclusion The repair producers formulated on this basis are verified in actual repairs and can satisfy the strength design requirements on the fuel tank structure.The proposed improvements can improve the fatigue quality of aircraft.