[1] W H Chen, H S Lin, Y M Lin, et al. TurboQuad: A novel leg-wheel transformable robot with smooth and fast behavioral transitions. IEEE Transactions on Robotics, 2017, 33(5): 1025-1040.
[2] F J Comin, W A Lewinger, C M Saaj, et al. Trafficability assessment of deformable terrain through hybrid wheel-leg sinkage detection. Journal of Field Robotics, 2017, 34(3): 451-176.
[3] Y X Xin, X W Rong, Y B Li, et al. Movements and balance control of a wheel-leg robot based on uncertainty and disturbance estimation method. IEEE Access, 2019, 7: 133265-133273.
[4] Y X Xin, H Chai, Y B Li, et al. Speed and acceleration control for a two wheel-leg robot based on distributed dynamic model and whole-body control. IEEE Access, 2019, 7: 180630-180639.
[5] F J Comin, C M Saaj. Models for slip estimation and soft terrain characterization with multilegged wheel-legs. IEEE Transactions on Robotics, 2017, 33(6): 1438-1452.
[6] F L Zhou, X J Xu, H J Xu, et al. Transition mechanism design of a hybrid wheel-track-leg based on foldable rims. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2019, 233(13): 4788-1801.
[7] Y She, C J Hurd, H J Su. A transformable wheel robot with a passive leg. IEEE/RSJ International Conference on Intelligent Robots and Systems, Hamburg, Germany, Sept. 28-Oct. 2, 2015: 4165-1170.
[8] K Tadakuma, R Tadakuma, A Maruyama, et al. Mechanical design of the wheel-leg hybrid mobile robot to realize a large wheel diameter. IEEE/RSJ International Conference on Intelligent Robots and Systems, Taipei, Taiwan, China, October 18-12, 2010: 3358-1365.
[9] G Endo, H Shigeo. Study on roller-walker-energy efficiency of roller-walk. IEEE International Conference on Robotics and Automation, Shanghai, China, May 9-13, 2011: 5050-1055.
[10] Y S Kim, K J Cho, C N Chu. Wheel transformer: A wheel-leg hybrid robot with passive transformable wheels. IEEE Transactions on Robotics, 2014, 30(6): 1487-1498.
[11] D Y Lee, J S Koh, J S Kim, et al. Deformable-wheel robot based on soft material. International Journal of Precision Engineering and Manufacturing, 2013, 14(8): 1439-1445.
[12] G Chen, B Jin, Y Chen. Nonsingular fast terminal sliding mode posture control for six-legged walking robots with redundant actuation. Mechatronics, 2018, 50: 1-15.
[13] C Hubicki, J Grimes, M Jones, et al. Atrias: Design and validation of a tether-free 3d-capable spring-mass bipedal robot. The International Journal of Robotics Research, 2016, 35(12): 1497-1521.
[14] C Hubicki, A Abate, P Clary, et al. Walking and running with passive compliance. IEEE Robotics and Automation Magazine, 2016: 4-1.
[15] M Schwarz, T Rodehutskors, D Droeschel, et al. NimbRo Rescue: Solving disaster-response tasks through mobile manipulation robot Momaro. Journal of Field Robotics, 2017, 34(2): 400-125.
[16] D Belter, M R Nowicki. Optimization-based legged odometry and sensor fusion for legged robot continuous localization. Robotics and Autonomous Systems, 2019, 111: 110-124.
[17] T Matsuzawa, A Koizumi, K Hashimoto, et al. Crawling gait for four-limbed robot and simulation on uneven terrain. IEEE-RAS International Conference on Humanoid Robots, Cancun, Mexico, Nov 15-17, 2016: 1270-1275.
[18] R Buchanan, T Bandyopadhyay, M Bjelonic, et al. Walking posture adaptation for legged robot navigation in confined spaces. IEEE Robotics and Automation Letters, 2019, 4(2): 2148-2155.
[19] K Jayaram, R J Full. Cockroaches traverse crevices, crawl rapidly in confined spaces, and inspire a soft, legged robot. Proceedings of the National Academy of Sciences, 2016, 113(8): E950-E957.
[20] J K Sheba, M R Elara, E Martínez-García, et al. Trajectory generation and stability analysis for reconfigurable Klann mechanism based walking robot. Robotics, 2016, 5(3): 13.
[21] S Nansai, M R Elara, M Iwase. Speed control of Jansen linkage mechanism for exquisite tasks. Journal of Advanced Simulation in Science and Engineering, 2016, 3(1): 47-17.
[22] H B Zang, L G Shen. Research and optimization design of mechanism for Theo Jansen bionic leg. Journal of Mechanical Engineering, 2017, 53(15): 101-109. (in Chinese)
[23] J X Wu, Q Ruan, Y A Yao. A novel skid-steering walking vehicle with dual single-driven quadruped mechanism. Mechanisms, Transmissions and Application, Springer, Cham, 2015: 231-138.
[24] J X Wu, Y A Yao, Q Ruan, et al. Design and optimization of a dual quadruped vehicle based on whole close-chain mechanism. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2017, 231(19): 3601-1613.
[25] M Hutter, C Gehring, A Lauber, et al. Anymal-toward legged robots for harsh environments. Advanced Robotics, 2017, 31(17): 918-131.
[26] M Raibert, K Blankespoor, G Nelson. Bigdog, the rough-terrain quadruped robot. Proceedings of the IFAC World Congress, Seoul, Republic of Korea, 2008, 41(2): 10822-10825.
[27] J Hwangbo, J Lee. Learning agile and dynamic motor skills for legged robots. Science Robotics, 2019, 4(26): 5872.
[28] D Giesbrecht, C Q Wu, N Sepehri. Design and optimization of an eight bar legged walking mechanism imitating a kinetic sculpture, "Wind Beast" Transactions of the Canadian Society for Mechanical Engineering, 2012, 36(4): 343-155.
[29] J X Wu, Y A Yao. Design and analysis of a novel multi-legged horse-riding simulation vehicle for equine-assisted therapy. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2018, 232(16): 2912-1925.
[30] J X Wu, Y A Yao. Design and analysis of a novel walking vehicle based on leg mechanism with variable topologies. Mechanism and Machine Theory, 2018, 128: 663-181.
