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This work was supported in part by National Natural Science Foundation of China (Grant No. 61533008), Aeronautical Science Foundation of China (Grant No. 20165752049), and Jiangsu Natural Science Foundation of China (Grant No. BK20171417).
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Figure 1
(Color online) The horizontal oscillation amplitude $\varrho(y,t)$ and position error $x_1(t)$ of the helicopter lifting system.