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按照适航要求,民用飞机进行型号合格审定试飞时,涉及许多边界科目,如包线扩展、颤振、失速等,具有一定的危险性。进行风险科目试飞的架次,在交付试飞前,一般都专门安装空中应急离机系统来保证参试人员的人身安全。在设计应急离机系统时,需要选择合适的应急离机舱门开口位置,使得参试人员应急离机后不会与飞机机体发生碰撞。一般通过CFD模拟和风洞试验来预测离机轨迹,但需要消耗较多资源和较长周期。基于设计阶段快速分析的需求,本文对应急离机后人的受力进行了合理假设和简化,进行动力学建模,建立较为简单的运动轨迹计算公式,形成判断碰撞的工程估算方法。为了较为精确地模拟阻力,通过CFD计算分析得到CD(阻力系数)。
In accordance with the airworthiness requirements, civil aircraft type certification test flight involves many boundary subjects, such as envelope expansion, flutter, stalling, etc., with a certain degree of danger. Conduct a test flight of the subjects of risk, before delivery of the test flight, the airborne emergency off-machine system is generally specially installed to ensure the personal safety of the test personnel. In the design of emergency off-machine system, you need to select the appropriate emergency door position from the opening of the hatchback, making the participants off-line after the accident will not collide with the aircraft body. Off-road trajectories are typically predicted by CFD simulations and wind tunnel tests, but consume more resources and longer cycles. Based on the needs of rapid analysis during the design phase, this paper makes reasonable assumptions and simplifications for the stress of emergency off-line people, and then makes a kinetic modeling to establish a relatively simple motion path calculation formula to form a project estimation method to determine the collision. In order to simulate the resistance more accurately, CD (Resistance Coefficient) was calculated by CFD calculation.