[2] [2] J J Ge，Y Qin，D B Deng. Design of MWIR continuous zoom with light weight［J］. International Archives of the

          Photogrammetry，Remote Sensing and Spatial Information Sciences，2013，9：147-150.

[6] [6] Jiangyong Yao，Guichao Yang，Zongxia Jiao，et al. Adaptive robust motion control of direct-drive DC motorswith continuous friction compensation［J］. Abstract and Applied Analysis，2013，6：1-14.

[9] [9] Manju Rani，Naveen Kumar，Harendra Pal Singh. Motion/force control scheme for electrically driven cooperative multiple［J］. Control Engineering Practice，2019，88：52-64.