代表性研究成果
[1] Kai Liu, Xianwen Kong, Jingjun Yu. Algebraic synthesis and input-output analysis of 1-DOF multi-loop linkages with a constant transmission ratio between two adjacent parallel, intersecting or skew axes[J]. Mechanism and Machine Theory, 2023, 190: 105467.（SCI; 1区Top）
[2] Kai Liu, Jingjun Yu, Xianwen Kong. Structure synthesis and reconfiguration analysis of variable-DOF single-loop mechanisms with prismatic joints using dual quaternions [J]. ASME Journal of Mechanisms and Robotics, 2022, 14(2): 021009.（SCI）
[3] Kai Liu, Jingjun Yu. Algebraic method for exact synthesis of 1-DOF linkages with arbitrarily prescribed constant velocity ratios[J]. ASME Journal of Mechanical Design, 2022, 144(6): 063301.（SCI）
[4] Kai Liu, Xianwen Kong, Jingjun Yu. Operation mode analysis of lower-mobility parallel mechanisms based on dual quaternions[J]. Mechanism and Machine Theory, 2019, 142: 103577.（SCI; 1区Top）
[5] Kai Liu, Jingjun Yu, Xianwen Kong. Synthesis of multi-mode single-loop Bennett-based mechanisms using factorization of motion polynomials [J]. Mechanism and Machine Theory, 2021, 155:104110.（SCI; 1区Top）
[6] 于靖军,刘凯,孔宪文.多模式机构研究进展[J].机械工程学报, 2020, 56(19): 14-27.（EI）
[7] Kai Liu, Jingjun Yu, Xianwen Kong. Analysis of the spinning motion and the orientation description methods for 2-DOF RMs[C]//ASME 2018 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, Quebec, Canada, 2018: V05BT07A073-09.（EI）
[8] Kai Liu, Jingjun Yu, Xinjun Liu. Operation mode comparison of three 1T2R parallel mechanisms based on geometric constraints[C]//IEEE 2019 16th International Conference on Ubiquitous Robots, Jeju, Korea, 2019: 137-142.（EI）
[9] 于靖军，刘凯.用于等效齿轮传动的单自由度连杆机构及方法[P].专利号：ZL202110069119.4.
