| Citation: | WANG Nantian, WANG Xiong, SUN Peng, et al. Self-adaptive piecewise fitting filtering method for test data in continuous sweeping angle of attack[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(6): 1145-1151. doi: 10.13700/j.bh.1001-5965.2020.0145(in Chinese)
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When the traditional step sweeping attack angle data processing method is used for directly processing the test data of continuous sweeping attack angle test, the low-frequency vibration component cannot be removed. Based on the characteristics of approximate symmetry and local linearity in the test data, a piecewise binomial fitting method is presented. Principle of the method is presented, and its minimum variance based piecewise length determination is introduced in details. The experimental results based on the test signal show that the method can filter the low-frequency component signal by nearly 70%, effectively improving the data processing accuracy. The method is also verified by common mode test, and has been successfully applied to some model tests.
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