Research On Airdrop Methods Of Unpowered Airdrops

It is a major problem in China’s current airdrop supplies to provide relief supplies to the location of the accident.For the unpowered airdrops,this paper presents a low cost quick and simple method to solve this problem.In this paper,the method of airdrop with guidance and unguided under different conditions is studied in order to meet the requirements of airdrop index and process constraints,which has important theoretical and engineering value for solving the problem of low cost and fast airdrop.The research on the specific air dropping method of no-power air delivery system is carried out,and the following aspects shall be focused on:(1)Mathematical description and modeling of the airdrop method of an unpowered airdrop.In this paper,a mathematical description is given for the problem of airdrop of an unpowered airdrop,and a basic 6 d flight mathematical model is established.It may include drop of methods,all kinds of random in the process of the descent,constraints in descending flight,the influence of external wind field and ocean currents,the aerodynamic error of the unpowered aerial vehicle itself and so on.(2)Unguided airdrop method.Aiming at the problem of low-cost and rapid airdrop technology,a non-guidance airdrop airdrop proposal was proposed.By establishing the model,the sensitivity of the parameters such as the shape,size and aerodynamics of the airdrop to flight path and landing point is studied,and the influence of external wind field,stochastic coupling error and other external factors on flight trajectory and landing point is analyzed.Using neural network algorithm and flight mechanics algorithm,the method of air drop instruction is presented online,and the simulation test is carried out to verify the feasibility of this method at low altitude.(3)Guidance airdrop method.In order to solve the problem that airdrop cannot be carried out accurately based on unguided airdrop method under the conditions of high altitude airdrop and external interference,a guided airdrop method is proposed.The airdrop body is equipped with airfoil guidance device,and the flight guidance law based on generalized proportional guidance is designed,by flight simulation,the drop method guidance algorithm performance is analyzed,and the influence of the wind field on the airdrop point of the controlled airdrop with airfoil is studied,and it was verified that this method has good airdrop accuracy under high ambient airdrop conditions.(4)Airdrop airspace and airdrop platform.In order to implement the target of rapid airdrop in different environments,the problems of the supporting airdrop airspace and aerial platform are studied.Firstly,the airdrop airspace with or without wind field is analyzed,the common environmental factors in airdrop scenario are studied,a drop in the multi-objective task planning method is presented by ACO,by solving the quasi-optimal solution,the method can give the task path planning quickly.Then,the method of single target multiple air drops in the air drop task is proposed,and the feasibility of this method is verified by simulation.Through the above task planning method and single target multiple air drop method,the efficiency of fast air drop can be effectively improved.In the end,by aerial platform building a set of real-time online fast drop method is given,and through 3 d visual simulation of flight airdrop,the process of flight airdrop is analyzed and the rationality of the whole method is verified.