关键词: 鸭式飞机, 鸭翼载荷, 应变计改装, 载荷校准, 载荷建模与检验, 飞行试验

Abstract:

According to the structural characteristics and load measurement requirements of modern canard aircraft, a method using strain gauge modification at the outer edge of canard shaft profile is presented in this paper. In order to achieve the purpose that a strain bridge is sensitive for the corresponding load and has smaller response to other loads, strain gauges at different sides are used in a particular manner to compose certain Wheatstone bridge. So that moment, torque and shear loads from strain response are mechanically decoupled. Factors of canard moment, torque and shear load are mechanically decoupled from the strain response. In the load calibration tests, upward calibration loads are imposed on both left and right canards symmetrically at the same time, and the weight of the aircraft and rear fuselage bracket are used to balance the movements and rotation caused by loads. Therefore, there is no necessity to constrain and fasten the aircraft in a complex way. Through the analysis of the calibration test data, the model of canard loads is established and verified with multiple linear regression method. Meanwhile, typical flight status is selected to analyze the actual flight loads of canard in all the cases and severe flight load state is obtained.

Key words: canard aircraft, canard load, strain gauge modification, load calibration, load modeling and verification, flight test