基于aerosim模型库的飞行器地面动力学模型建模方法

本文利用aerosim飞行动力学模型库,介绍了在HL20飞机的基础上搭建地面动力学模型的方法,以实现HL20飞机降落后的滑跑,转弯和刹车功能。

新型飞机着陆动载特性研究

为了研究道面板在高胎压、大质量、短距离起降的作用下的荷载响应规律,根据新型飞机的受力特性和运动规律,分析起落架-机轮-道面耦合作用,并考虑飞机气动力变化,建立起5自由度的飞机地面动力学模型。通过四阶Runge-Kutta法求解微分方程组,研究道面荷载随时间和空间的变化问题。研究结果表明,新型飞机主起落架产生的道面动载系数能达到1.4,飞机下沉速度是影响着陆荷载的主要因素,其次为飞机质量与俯仰角,飞机胎压对着陆荷载影响较小,但对道面板影响较大。

Ground movement mechanism in tectonic stress metal mines with steep structure planes

When mining metal mines with steep structure planes by the caving method,there is a mechanical model in which the horizontal stress on the rock mass is simplified as a column before surface subsidence.The model is used to deduce critical support load and limiting column length for a given horizontal stress and support pressure.Considering the impact of the column effect,a method is proposed to determine the movement of the ground and caving area in a mine.After surface subsidence,the horizontal stress on a surrounding rock mass can be simplified to a cantilever beam mechanical model.Expressions for its bending fracture length are deduced,and a method is given to determine its stability.On this basis,an explanation for the large ground movement and subsidence scope was given.A case study shows that the damage effect of column and cantilever beam is significant for ground movement in metal-ore mine,and an appropriate correction value should be applied when designing for its angle of ground movements.

无人机地面滑行自主起飞的建模与控制

前三点式无人机地面滑行起飞的整个过程由三轮滑行、抬前轮滑行和离地至安全高度3个阶段组成,3个阶段飞机的受力与约束均不相同。根据3个阶段的运动特性和飞机的气动特性,建立了一种通用的无人机地面纵向动力学模型,确定其抬前轮速度和离地速度,从而选择合适的控制策略来实现其自主起飞。以某型无人机为背景,建立了全量的非线性模型,并在此基础上设计了一种起飞的控制方案。仿真结果表明,此模型与控制方案具有较高的工程应用价值。