Guidance Technology Of Maneuvering Ammunition Based On Spin-Stabilized

The anti-craft gun has an old history in aerial defense campaign. It has been thought to be out of date since the antiaircraft missile appeared. However, it has proved that the anti-craft gun is irreplaceable not only by the truth of last several local wars around the world, but also by the strict deduction according to the shooting theory. The ordinary anti-craft gun has a very low hit rate and could only cause damage to the targets by concentrated firing, which has brought about a very large pressure to the logistic supply. Therefore, it has become an urgent problem that how to explore the potential ability of anti-craft gun under the present conditions. Focus on this problem and supported by the national defence pre-study fund "××××××", in order to raise the hit rate and fight efficiency under the present conditions, this thesis deals with the guidance on high-speed and high-rolling projectile which is often used in air defense and antimissile.Guidance technology of ammunition based on spin-stabilized, which is defined as "maneuvering ammunition", is put forward by our studying team, "maneuvering am-munition" has the following properties:1) using the high initial speed as power; 2) using the high-rolling to provide stability; 3) using the controllable base bleed to control the high low; 4) using the controllable bias flow to control orientation. It is a new type of ammunition, which has been proposed by the present technology storage and the research fruits on the na-tional defence pre-study in the past few years, and it has a positive meaning to air defense and antimissile. Based on these, this thesis discusses the feasibility of applying the base bleed and the moving-mass framework in the guidance of maneuvering ammunition. The results have shown the effectiveness of the two proposed methods. Then the research on the detailed control strategies have been carried out. This thesis includes mainly the following two parts of contents:(1) Base Bleed:mainly in chapter 2The simulation about the model of six-freedoms model of base bleed shows that the lighting time and displacement volume have an obvious impaction on the exterior ballistic, which is mainly on the high low, hence demonstrating the effectiveness of controlling by base bleed. However, because of the instability of gunpowder combustion, such a kind of control strategy could only regulate the high low crudely. Meanwhile, in order to raise the damage probability of maneuvering ammunition, the problem of multiple hit has been investigated, and a new approach of the multiple hit system based on the technology of base bleed, which is a supplement to the fight by maneuvering ammunition has been proposed. Analyzing the hit system theoretically, focus on two problems about solving the control parameters with two constraints, under the condition of a type of the same frequency fire, multiple hit algorithm of solving the two points boundary problem with unknown fire angle has been proposed to obtain the initial fire angle and the time of ignitable time for base bleed. The simulation has been carried out and the system has been brought into the guidance system of maneuvering ammunition.(2) Moving-mass Framework:mainly in chapters 3-7The situation of using moving-mass framework as control style has been studied. The results show the moving-mass framework could control the high low and bias flow of ma-neuvering ammunition. However, it has a limited ability of regulation, which hence is called "fine adjustment".First, a moving-mass control framework suitable for maneuvering ammunition has been proposed to establish the dynamic model of multi-body system. Simulation of the variation of exterior ballistic parameters while the moving-mass is moving has been carried out de-tailed to obtain the key conclusion on the controllability of exterior ballistic parameters in the model proposed in this thesis. At the same time, a simplified model has been given and the analysis and simulation of the angular velocity and stability of the model have been car-ried out; Second, the system model has been analyzed in the control point of view, which shows that the attitude controller is key, and the loop of angular velocity and angle have ob-vious multiple time scale characteristics. The total strategy of controller designing has then been proposed. Finally, the controlled model of fast time scale loop for angular velocity has been firstly established and then simplified to a space form. Based on satisfactory control theory, the control law is designed to track the angular velocity. For the slow time scale loop of angle, the controlled model is also established, and then the inner loop controller has been designed by the method of inverse system, while the outer loop use the robust PID controller. The parameters of outer loop controller has been obtained under the constraint of pole placement. Simulation has been given for both of the two time varying loop.