Research On Mulriple Control And Guidance Technology Of High Rolling Projectile

A vital weakness of traditional gun weapon system is the large quantities of ammunition consumption caused by low firing accuracy. As a defenced weapon, compared with defence missile, gun weapon system has the advantages in cost and initial speed. The problem that how to improvre precision of gun weapon systems has become an important reaearch item. This thesis deals with the guidance on high-speed and high rolling projectile. The work is supported by the national defence prestudy fund "the guidenization of high-speed and high-rolling ammunition with land-based measuring and controlling equipment". Guidance technology of ammunition based on spin-stabilized, which is defined as maneuvering ammunition, is put forward by our reaearch team. The characteristic of maneuvering ammunition is that the aerodynamic shape is not changed. Based on reserved high initialization speed, maneuvering ammunition, pitching and orientation can be controlled by using the controllable base bleed, the aerodynamic force of drag brake and moving mass, respectively. This thesis discusses the feasibility of applying the base bleed and the moving-mass framework in the guidance of maneuvering ammunition. This thesis includes mainly the following two parts of contents:(1) DynamicsAt first, the dynamics model of maneuvering ammunition is constructed. The guidance feasibility of high rolling projectile is analyzed based on bias flow phenomena. The factors which affect high rolling projectile track are analyzed by using parameter perturbation method. The simulation results show that drag coefficient, polar moment of inertia and distance from barycenter to drag center are important for projectile track. Compound control method is confirmed. The pitching is able to be controlled for changing distance from barycenter to drag center, and polar moment of inertia can be controlled by using moving mass. The orientation is able to be controlled via changing drag coefficient by using the base bleed and the aerodynamic force of drag brake. The dynamic model is derived based on the momentum theorem and the moment of momentum theorem for maneuvering ammunition with moving mass control mode. The moving mass layout is optimized based on analysing various moving mass layout. Turbinate stability is derived on Lyapunov theory for high roll projectile with moving mass control mode. The restriction of moving mass layout is concluded by flying stability. The effects of major factors, such as moving mass ratio, moving mass position, base bleed start time and base bleed powder, are analyzed.(2)Control and GuidanceThe dynamic result shows that the base bleed and the aerodynamic force of drag brake affects high rolling projectile's rotation system and the moving-mass affects high rolling projectile's motion system. The control organization deployment time is key in using base bleed and drag brake to control range. Based on analyzing attack mode of high roll projectile, a proportional acceleration convergence algorithm is adopted, and the predicted precision of falling point is achieved by the algorithm in less times of t rajectory repeat computation.Based on high speed rotation missile characteristic, the moving mass layout optimization situation is deployed. The dynamic equation is established. The attitude tracking control system is divided into attitude tracking control loop and angular velocity tracking control loop via two-time scale method. The sliding hyperplane containing tracking error and integral function was designed in outer loop. The control law based on state depended Riccati equation was applied in inner loop.The simulation result is given to show that the proposed control law is effective and provides a necessary reference for practical engineering. Firstly, the guidance model is established, and the relative kinematical equations for missile and target are set up. The guidance law is designed via SDRE technique. The controller is solved using three methods:Schur method, modified Newton method andθ-D method. Finally, the simulation results show the effectiveness of the control law based on SDRE method to the two dimensional guidance law, and the SDRE method has shown a great advantage over method with larger amount of calculation, while comparing with the traditional Schur method, the modified Newton method could largely raise the calculation precision.The research in this thesis covers dynamics, guidance and control topic of guidancing of high roll projectile. I hope that these researches could provide a reference for guidance of traditional gun weapon.