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针对民用飞机设计方案纵向地面操稳特性的评估需求,面向适航标准的要求,提出了一种基于数字虚拟飞行的评估方法。基于适航条例要求提出了纵向地面操稳特性的量化判定准则,建立了飞机的地面运动模型和驾驶员操纵模型,以实现起降等特定地面运行任务的数字虚拟飞行,最终依据数字虚拟飞行结果和判定准则对飞机设计方案的地面操稳特性做出评估。应用此方法研究了某大型运输类飞机的纵向地面操稳特性。数字虚拟飞行结果表明:前翻倾向的严重情况发生在起降过程的高速滑行段,主轮刹车引起的机身前翻倾向是显著的,起落架纵向定位参数设计以及飞行进近参数选择均会对飞机的纵向地面操稳特性产生影响。
Aiming at the requirement of airworthiness standard for the evaluation of longitudinal ground handling characteristics of civil aircraft design scheme, an evaluation method based on digital virtual flight is proposed. Based on the requirements of airworthiness regulation, the quantitative judgment criterion of the longitudinal ground handling characteristics was proposed, and the ground motion model and the driver manipulation model of the aircraft were established to realize the digital virtual flight of certain ground operations such as take-off and landing. Finally, And judgment criteria to evaluate the ground handling characteristics of the aircraft design scheme. This method is used to study the longitudinal ground handling characteristics of a large transport aircraft. The results of digital virtual flight show that the serious situation of forward dumping occurs in the high-speed taxi stage during the take-off and landing process, and the tendency of leading body caused by the main-wheel brake is remarkable. Both the design of landing gear longitudinal positioning parameters and the selection of flight approach parameters Impact on the vertical ground handling characteristics of the aircraft.