武装直升机射击后座力补偿控制系统设计

武装直升机武器发射时的后座力会引起载机运动参数的变化,进而影响武器的射击精度,它实质上是一种扰动响应现象.为了减小这些影响,提出了基于非线性H_∞方法的后座力补偿控制方案. 首先利用飞行器六自由度动力学方程,通过分 析求解Hamilton-Jacobi偏微分不等式,得到鲁棒的期望力和力矩指令.然后根据直升机气动力和力矩的推导公式,采用迭代算法对期望值进行逼近,得到实际的桨矩操纵量.最后结合飞行控制系统和后座力干扰参数进行了仿真验证,仿真结果表明所设计的控制系统具有较好的性能和稳定鲁棒性,能有效抑制后座力对机体运动状态的扰动.

Attack helicopter gun recoil compensation control system design

The recoil force from attack helicopter gunfire would cause the change of kinetic parameter of the carrying aircraft, and further affect the firing accuracy of weapon. Actually it is of a phenomenon on disturbance response. In order to reduce this recoil effects, a gun recoil compensation control framework based on nonlinear H_∞ method was put forward. First, according to the six-degree-of-freedom motion equations, the anticipated force and moment commands were derived by solving the Hamilton-Jacobi partial differential inequation. Then on the basis of helicopter aerodynamic force and moment formula, the anticipated commands were approached by using iterative algorithm until getting actual blade pitch commands. Finally the simulation was carried out with the combination of the flight control system and gun recoil parameters. It-s indicated that the control system can achieve good performance and stability robustness, and effectively attenuate the disturbance to aircraft.