Research On Some Key Dynamics Problems Of Terminal Correction Submunintion

In order to improve ballistic missile ability of long-range attacking linear targets, it is urgent to develop the controlled warhead taken by ballistic missile. Some key dynamics problems, which are important in the design and analysis of the terminal correction submunition (TCS), are studied in this thesis. Simulation results are comparative with flight test data, which confirms the correctness and availability of the method.On the basis of the working theory of impulse correction submunition, general system design of TCS is introduced in detail. The structure configuration, the terminal control method and the working process of TCS are designed. An analysis of main ballistic parameters of TCS, which is taken by ballistic missile, are proposed. The firing effectiveness of TCS is calculated by the method of Monte-Carlo, which can provide the foundation for the general design of TCS.The dynamic characteristic of parachute-bomb system is extremely complex. The velocity and spinning speed of the parachute-bomb system have impact on the precision of submunition. Under the hypothesis of quasi-steady state, the dynamic principles and the Computational Fluid Dynamics (CFD) are colligated to analyze and simulate the parachute-bomb system when there is no interaction of the parachute canopy, the suspension lines and the spinning bomb. The velocity and spinning speed of the parachute-bomb system are attained. The simulation results are consistent with the airdrop test data, which demonstrates the accuracy of the numerical simulation model. This method can be used in the design of the parachute-bomb system, as well as the airdrop experiment of parachute-bomb systems.With the purpose of reducing the deviation of object identification owing to the sloshing movement of submunition, the twelve-degree freedom dynamic model of the parachute system is developed for the analysis of bomb scanning state. The condition of stability is put forward, and the influences of some key parameters are also analyzed. Aiming at removing the influence of wind gust, the nine-degree freedom dynamic model of the parachute system is developed firstly, then five-degree freedom dynamic model by linearization about the steady state is proposed. Using the principles of dynamics of parachute systems, a new method is brought forward which could be used in target identification. Successful airdrop test demonstrates the rightness and feasibility of this method which can be used in the guidance of smart submunition systems.Using Kane's method, a dynamical model of numerical simulation is built, which can solve the problem of airdrop tether test system. A constraint force algorithm (CFA) is constructed for the simulation of a kind of open chain multi-rigid-body system. Numerical results validate the experimentation of airdrop in Airship-towed system. And CFA can also be applied to solve the problem of tether dynamics in other fields.Results of this dissertation not only have been successfully applied in the design of a new submunition, but also can provide analysis and demonstrating methods for other similitude system design.