Arrangement and method for balancing a gun barrel of a vehicle mounted weapon system

A method performed by a control device for balancing a gun barrel of a vehicle mounted weapon system, the weapon system comprising the gun barrel mounted to a turret via a weapon cradle, the weapon cradle being arranged to allow elevation movement of the gun barrel about an elevation axis, the method comprising the step of providing a pretension torque opposing imbalance of the gun barrel by a suspension system, wherein the suspension system comprises a torsion bar having a first end portion and a second end portion configured to be connected to the weapon cradle so as to provide said torque, characterized by the step of:

• determining current imbalance of the gun barrel;
• and
• automatically adjusting the torque on the torsion bar by an actuator unit and a torque adjustment device based on sensor data from the thus determined imbalance of the gun barrel so as to dynamically counteract imbalance of the gun barrel, wherein the torque adjustment device comprises:
• a torsion bar support member around the first end portion of the torsion bar and configured to be fixedly attached to the turret;
• and
• a torque adjustment member configured to adjust the torsion bar support member so as to apply torque on the torsion bar, wherein the actuator unit is configured to adjust, based on sensor data indicative of current imbalance of the gun barrel so as to dynamically counteract imbalance of the gun barrel, the torque adjustment member so that the torsion bar support member applies the torque on the torsion bar.