The Analysis On Motion Stability Of Trajectory Correction Projectiles Forced By Impulse Corrective Force

The technology of trajectory correction is an important technical measure for improving the combat capability of conventional ordnance. In this thesis, a new type of trajectory correction projectiles(TCP) which detect target by strapdown imaging seeker and correct terminal trajectory by impulse engine is investigated, and the influence of impulse corrective force on motion stability and strapdown imaging seeker are analyzed in detail.To begin with, a summarization is made for the development situation of the technology of trajectory correction. According to the characteristic of impulse correct, it builds a six-degree-of-freedom dynamics model and presents the TCP's body-tracking guidance and the impulse-proportional guidance.The small disturbance theory is used to establish the angular motion model of TCP. Based on the Liapunov's indirect method, the dynamical stability conditions is presented and the effect of some forces on stability are discussed. The influence of impulse corrective force on the equation of angle of attack and its special solution is analyzed.The influence of impulse force and moment and flight velocity on angle of attack is analyzed, the simulation results show that the angle of attack attenuates as an exponential rule. Based on the analysis, the range of impulse force and moment to ensure the stability is ascertained. The influence of impulse engine fire interval and trigger timing on motion stability is also considered. Moreover, considering the flight stability and correct efficiency of impulse engine, some factors are discussed in design of rotational speed.Finally, the influence of attitude motion on the measurement of strapdown imaging seeker is analyzed. To ensure the target to be in the visual field of seeker all the time during the flight, the influence of impulse force and impulse moment and flight velocity on line-of-sight oscillation are discussed. The decoupling algorithm of strapdown imaging seeker is put forward, and the influence of attitude motion on the obtaining of line-of-sight rate is analyzed.The results of this dissertation would provide references for system design and some further research of TCP.