Study on the Classification Method of the Usage Severity of Aircraft Structures

The high overload and high maneuverability in the training course result in the structural damage and the life consumption speed is accelerated, the use of each model is obviously higher than the expected use, which greatly increases the risk of the operation of aircraft. The life design and verification work based on the design load spectrum in the design stage cannot meet the requirements of ensuring the flight safety in the whole life of aircraft. How to ensure the security of active military aircraft under the change of actual use mission has become an urgent problem to be solved. Based on the analysis method of structural fatigue individual aircraft tracking, this paper expounds the design method and task profile of individual aircraft, studies the calculation of equivalent damage of individual aircraft, puts forward three classification methods of usage severity of aircraft, which are mild severity, severity moderate and heavy severity, and carries out the determination of reference equivalent damage for the object aircraft. In addition, the interval classification method is used to classify the usage severity, and the method of the usage severity analysis is provided.