Controller Design and Analysis of Spacecraft Automatic Levelling and Equalizing Hoist Device based on Hanging Point AdjustmentLaiying Tang, Guangtong Liu, Tao Guo, Zhe Liu, Ruiqin Hu and Dabao GuoMATEC Web Conf., 77 (2016) 01015DOI: https://doi.org/10.1051/matecconf/20167701015