A new type of calibration rig for wind tunnel balances

A new balance calibration rig has been designed and built for the T1500 wind tunnel, with applicability to a large variety of balances, including half-model as well as sting-type balances with one to six components. The typical load capacity range is ±50 kN normal force. The rig is automatic with calibration loads generated by pneumatic actuators, controlled by a dedicated computer. Calibration loads are determined via precision transducers. A nonrepositioning principle has been used, with correction of component loads due to balance deflection under load. Data acquisition and the correction of components are automatic and controlled by computer. This rig has proved to give the same accuracy and more than 50% reduction in calibration time compared to previous methods. Another important advantage is that with this rig, calibration can be carried out more conveniently, without the need to lift heavy weights