A new force-measuring balance for large-scale model in hypersonic wind tunnel

There is a strong coupling effect between the body and propulsion system of the integrated hypersonic vehicle. The scaled-down model cannot reflect the laws of physics. Therefore, carrying out hypersonic aerodynamic tests using large-scale aircraft models is an urgent difficulty and the key link in the research of hypersonic aircraft. This Note presents a design scheme of large-scale and heavy-load three-component gauge strain balance. The balance innovatively uses the design of a "herringbone" force measuring element and a support plate to ensure the sensitivity of the main channel and solve the problem of serious coupling between channels. In order to solve the problem of insufficient stiffness caused by the large scale of the model, two convex plates are added to the contact surface between the model and the balance. Therefore, the difficulties encountered by large-scale aircraft models in a pulsed wind tunnel can be overcome effectively. The balance is verified by static calibration and wind tunnel test to meet the requirements. The results show that the balance meets the requirements of the aerodynamic load test of the large-scale and heavy-duty hypersonic vehicle model in a pulse combustion wind tunnel.