航空运输物资空投过程动力学模型

发布时间：2018-02-27 12:50

本文关键词： 运输机航空运输物资空投动力学特性分离体建模动态响应牵引伞刚体模型误差　出处：《交通运输工程学报》2016年02期 　论文类型：期刊论文

【摘要】：针对当前航空物资空投过程的运输机动力学建模条件过于简化、严重脱离空投过程实际的现状,研究了现有空投过程动力学模型的适用性,确立了分离体建模的方法。在无需分析货物与飞机整体的质心变化的情况下,分别以空投物资与飞机为对象进行受力分析,简化了建模过程且有利于定性分析货物对飞机的作用过程。为验证动力学模型的合理性,使用某型运输机数据进行了仿真试验。为验证空投过程中气动参数小扰动线性化的不合理性,通过3种模式对气动参数进行处理,对比分析了迎角响应曲线。对不同支持力、牵引力作用点、导轨模型、牵引力夹角模型、货物装载位置等条件下的空投过程运动学模型进行了量化分析,并与现有模型进行对比。仿真结果表明:气动参数小扰动线性化、视货物为运动规律已知的质点以及忽略舱内地板角等苛刻假设条件将导致较大的模型误差;在进行大牵引比、大质量货物空投时,应综合考虑牵引力数值与方向对空投动态响应的影响,并尽量将货物安装在飞机舱门附近,以缩短货物在舱内的运动时间,降低干扰力矩幅值。
[Abstract]:In view of the fact that the dynamic modeling conditions of air cargo airdrop process are too simplified and seriously divorced from the actual situation of air drop process, the applicability of the existing air drop process dynamics model is studied. The method of modeling separation volume is established. Without analyzing the variation of the center of mass of the cargo and the aircraft, the mechanical analysis of the air drop material and the aircraft is carried out respectively. It simplifies the modeling process and is beneficial to the qualitative analysis of the effect of cargo on the aircraft. In order to verify the rationality of the dynamic model, In order to verify the unreasonableness of small disturbance linearization of aerodynamic parameters in air drop process, the aerodynamic parameters are treated by three modes, and the response curves of angle of attack are compared and analyzed. The kinematics model of air drop process under the conditions of traction action point, guide rail model, traction angle model, cargo loading position and so on are analyzed quantitatively and compared with the existing models. The simulation results show that the aerodynamic parameters are linearized with small disturbance. Heavy assumptions such as considering the cargo as a known law of motion and neglecting the angle of the floor in the cabin will lead to larger model errors. The influence of the value and direction of tractive force on the dynamic response of air drop should be considered synthetically and the cargo should be installed near the cabin door as far as possible in order to shorten the time of the cargo moving in the cabin and reduce the amplitude of the disturbance moment.
【作者单位】：空军工程大学航空航天工程学院;中国人民解放军94106部队;
【基金】：国家自然科学基金项目(61273141) 航空科学基金资助项目(20141396012)
【分类号】：V212

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