The Study On The Large Angle Of Attack Scanning Characteristic Of Asymmetric Terminal Sensing Submunition And Its Application

On the basis of analyzing both the advantages and disadvantages of the current stable scanning technologies used in terminal sensing ammunition (TSA) system, this paper puts forward a new kind of technical method to realize stable scanning, which is to utilize a tip-weighted single-wing. It realizes stable scanning by using the spin resonance motion caused by the strong mass and aerodynamic asymmetries of projectile.The paper firstly sets up the forcing motion and resonance theory of the asymmetric projectile, which theoretically clarifies the formation mechanism of the stable scanning motion of asymmetric terminal sensing submunition, and also solves the feasibility problem of utilizing a tip-weighted single-wing to realizing stable scanning. On this basis, a physical model of the single-wing TSA system is designed. Whereafter, the two-body motion's dynamic model (6 degree of freedom and 7 degree of freedom) is constructed respectively on the assumption that the wing is rigid or slightly flexible. Subsequently, according to the geometrical and kinematic relations among different parts of the system, the constraint force and moment in the model is eliminated to obtain the standard form equation set which is fit for programming on the computer, and then programs it. The calculating result shows that the system designed in this paper can realize stable scanning motion well either the wing is rigid or is slightly flexible. Comparing the scanning parameter when the wing is rigid with that when the wing is slightly flexible, the laws of the wing's different flexibility influencing the scanning characteristic is discussed. Furthermore, taking the rigid wing as an example, this paper also discusses the laws of the system's structural parameter (such as the mass of the tip weight, the length and width of the wing) influencing the scanning parameter (such as the scanning angle, scanning frequency, falling velocity, and scanning space). Finally, the dynamic model considering the ballistic wind is constructed, and the laws of the different kind of wind influencing the scanning characteristic is discussed, which provides the theoretical foundation for the wind's correction when the projectile is fired.