Artificial Muscles as Actuators in Symmetrical Structure - Long Li; Jianfei Shen; Jiakai Ma; Hua Li; Yingzhong Tian; Wenbin Wang; Xiangjie Jia; Fengfeng Xi (IEEE International Conference on Robotics and Biomimetics, ROBIO 2018, Kuala Lumpur, Malaysia, December 12-15, 2018, 2018)