| Citation: | JIANG Qideng. Load measurement based on structure partition and strain bridge decoupling for telescopic main landing gear[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(5): 919-927. doi: 10.13700/j.bh.1001-5965.2020.0115(in Chinese)
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In order to resolve the problems of low sensitivity, high coupling degree and prominent nonlinearity during the load measurement of telescopic landing gear by strain method, the decoupling design methods of structure partition and strain bridge are proposed. Trough optimization design the effective parts of structure deformation under different equivalent load components were selected on the wheel-axis and piston rod with concentrated force transfer, and the bending moument-shear-torque strain bridge array was installed in the corresponding position.Furthermore, a simple and reliable load measurement model was obtained by combined loading calibration of landing gear.The load calibration tests show that the response sensitivity of the shear bridge on the wheel-axis to the vertical load is about 60% higher than that of the tension-compression bridge on the strut, and has no relation with the change of the compression stroke.Finally in the landing tests the load measurement model and flight data were used to calculate the landing load and buffer power absorption results which satisfy the requirments of engineering accuracy.
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