飞机起落架惯容式新型减震机制下微疲劳损伤早期检测与评估方法

Aiming at the landing gear system of the aircraft, the rules of the dynamical response for the landing gear system based on the novel “inerter-spring-damping” mode and its function mechanism of the incipient fatigue damage propagation and detection strategies for the structure parts in the landing gear will be researched in this proposal. There are some barriers in damage detection of the landing gear as bellows: the combined action of the complicated environment and loading-environment spectrum on the landing gear, the complex mechanism of the fatigue damage generation and propagation in the key structure parts and its uncertainty, the high false alarm ratio of the incipient damage detection for the key structure parts and so on. To resolve these problems, the shock absorption theory based on “inerter-spring-damping” mode, the physical model and the dynamical model, the statistical learning method, nonlinear ultrasonic detection and compressed sensing theories are utilized in this proposal, and the novel theories and methods of shock absorption mechanism and incipient damage detection will be researched. After that, the “inerter-spring-damping” model to simulate the drop process of landing gear will be presented, the rules of the damage generation and propagation mechanism of the key structure parts will be revealed, and the nonlinear ultrasonic detection and evaluation approaches for incipient damage in the key structure parts will be developed in this proposal. The research findings will improve the flight safety of the aircraft, and will supply the enabling techniques and put forward the application of the idea of integrated logistics support into the landing gear system of aircraft.

本申请拟以飞机起落架系统为对象，聚焦于研究起落架系统在新型减震模式下的动力学响应规律及其对关键构件微疲劳损伤机理与早期检测的作用机制等理论及方法。主要针对起落架系统的复杂工作环境及多变的载荷-环境谱的综合作用，关键构件疲劳损伤生成与演化机理中存在的复杂作用机制与不确定性、强非线性，关键构件微疲劳损伤早期检测的虚警率和误警率高等特点，结合基于“惯容-弹簧-阻尼”模式的新型减震方法与动力学模型、统计学习理论、非线性超声检测理论及压缩感知理论，研究起落架减震机制与微疲劳损伤早期检测的若干新理论新方法，提出适合于飞机起落架系统的“惯容-弹簧-阻尼”新型减震机制模型，揭示该减震机制下关键构件疲劳损伤在载荷-环境谱作用下的生成与演化规律，发展起落架关键构件微疲劳损伤的非线性超声检测与评估方法，为提高飞机起落架的运行安全性提供技术途径，为一体化装备综合保障理念在飞机起落架系统中的应用提供技术支撑。

本项目以飞机起落架系统为对象，探索起落架系统在惯容器-弹簧-阻尼模式下的动力学响应规律，研究起落架关键构件疲劳损伤早期检测等理论与方法。主要针对起落架系统的复杂工作环境及多变的载荷-环境谱的综合作用，关键构件疲劳损伤生成与演化机理中存在的复杂作用机制与不确定性、强非线性，关键构件微疲劳损伤早期检测的虚警率和误警率高等特点，结合基于“惯容器-弹簧-阻尼”模式的新型减振方法与动力学模型、结构损伤的非线性超声检测方法，研究了起落架新型减振理论与疲劳损伤早期检测理论与方法，提出了适合于飞机起落架系统的“惯容-弹簧-阻尼”新型减振机制模型，设计了面向飞机起落架的中低频段惯容减振系统，发展了起落架关键构件疲劳损伤的非线性超声检测与评估方法，为提高飞机起落架的运行安全性提供了有效的技术途径，并且为相关重要装备的减振设计提供了新的技术方案。