Abstract
Surface friction resistance acting on hypersonic vehicles with speeds greater than Mach 5 caused by air viscosity accounts for more than half of the total resistance. Accurate prediction of the surface resistance of a vehicle is the basis of resistance reduction, and prediction methods are mainly categorized into direct measurement and indirect evaluation methods. In this study, a novel three-component strain-type surface-friction-resistance measurement sensor is developed. A double-layer assembly-type orthogonal-sensitive element structure is adopted, and its friction-sensing block is replaceable based on test demands. Finite element calculation results show that the interference between the measured components of the friction-resistance sensor structure is considerably small, and the maximum theoretical interference is 0.53%. After calibration test compensation, the sensor exhibited high repeatability and accuracy, with three-measurement component precisions of 0.21%, 0.16%, and 0.09%, and the corresponding accuracies were 0.32%, 0.27%, and 0.19%, respectively.
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