Investigation of roll damping derivative of aircraft by wind tunnel tests

Roll damping derivative experimental techniques for air vehicles are investigated in wind tunnel of CAAA. The free oscillation dynamic derivative technique based on the integrated roll flexible hinge, the free oscillation dynamic derivative technique based on the combined roll flexible hinge, and the free rolling experimental technique based on the air bearing are studied respectively for different models. The mechanical damping characteristics, frequencies and anti-load capacity are the key points for the development of experimental technique. The study show that the test data have good regularity, and the test vibration frequency ranges are met when the proper technique is adopted. Thus the appropriate test technique should be chosen according to the test requirements for different vehicle shapes.