This study is concerned with the electro-hydraulic stabilization system for a gun in a tank.
The stabilization systems are provided to the modern tanks in order to permit target aiming and gun firing during the move of the tank.
The stabilization system is composed of gun-turret system, electro-hydraulic control system and gyro system which measures the position and velocity of the gun.
In this study, system was mathematically modeled with assumption that the tank body has only pitching motion and this mathematical model was linearized to determine the criteria for the stability of the system.
In this linearized system, the criteria for the stability was determined and the effects of the parameters to the system performances were also examined.
Digital computer simulation for each control system was performed with the mathematical model of the system. In this simulation, the rise time and the settling time with a sep input of the command angle for the gun were obtained and the steady state error with the sinusoidal pitching motion of the tank body was obtained, too.
The parameters of the electro-hydraulic control system are position feedforward gain, disturbance feedforward gain, area gradient and time constant of the servo valve and orifice coefficient of the by-pass orifice between load lines for each elevation control system and traverse control system.
Supply pressure, piston area, displacement of the hydraulic motor, cylinder chamber volume and hydraulic motor chamber volume are also parameters of the system.
From the simulation results, position feedforward gain, disturbance feedforward gain, area gradient of the servo valve, orifice coefficient of the by-pass orifice, piston area and displacement of the hydraulic motor must have adequate values for the fast and accurate response of the system.
Lage supply pressure, small volume of chamber and small time constant of the servo valve are also required for the fast and accurate response of the system.
