The Investigation of Dynamic Gun Pointing Errors for Helicopter Mounted Automatic Cannon Systems.

摘要

In a helicopter-weapon-system, the dynamic gun-pointing errors, caused by the application of weapon recoil forces, are the helicopter airframe vibrations and the relative turret servocontrol oscillations between the interconnected rigid body segments (i.e., motions of the azimuth and the elevation drive systems). A two-step analytical procedure has been developed to quantify these errors for different weapon systems and for different operating conditions. In this analysis, the airframe dynamics are first determined with a finite-element structural vibration model; the dynamics of the turret servocontrol system are then determined with a model of the gun and turret. The results of the two models are combined to obtain the dynamic motions of the gun about the initial aim-position. Finally, the statistical mean and the standard deviation errors in gun pointing are derived from the dynamic gun vibration patterns.