Analysis and Experiment of Combustion Powered Linear Actuator for Hopping
LUAN Yunguang1, WANG Huaming1,2, ZHAO Dongbiao1, WANG Zhen1, ZHANG Ketong1
1. Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
2. The State Key Laboratory of Fluid Power Transmission and Control, Hangzhou 310027, China
To accurately control a hopping robot with combustion powered linear actuator (CPLA), factors that influence the hopping-driving performance of CPLA are analyzed. Firstly, dynamic model is set up according to the working process of CPLA, and performance parameters are obtained. Nextly, how the mole ratio of oxidizer (nitrous oxide N2O) to fuel (propane C3H8) and injection pressures of the two gas influence the output performance of CPLA are analyzed by experiments. Results show that the influence do exist, when the mole ratio is 9.91, the hopping height of CPLA reaches a maximum, and a 3.17kg hopping mechanism can hop as high as 3.2m. CPLA energy efficiency is 8.4% and hopping efficiency is 7.01%. The CPLA outputs a high average power, and is of a large power-mass ratio during the driving hopping process.
 Younse P, Aghazarian H. Steerable hopping six-legged robot[C]//Conference on Space Exploration Technologies. Bellingham, USA: SPIE, 2008: doi: 10.1117/12.781725. Zhao J G, Xu J, Gao B T, et al. MSU jumper: A single-motor-actuated miniature steerable jumping robot[J]. IEEE Transactions on Robotics, 2013, 29(3): 602-614.  柴辉,葛文杰,魏敦文,等.一种间歇式弹跳机器人的机构设计与跳跃性能分析 [J].机械工程学报,2012,48(13):19-26.Chai H, Ge W J, Wei D W, et al. Mechanism design and hopping performance analysis of an intermittent hopping robot[J]. Journal of Mechanical Engineering, 2012, 48(13): 19-26. Kesner S B, Plante J S, Boston P J, et al. Mobility and power feasibility of a microbot team system for extraterrestrial cave exploration[C]//IEEE International Conference on Robotics and Automation. Piscataway, USA: IEEE, 2007: 4893-4898. Noh M, Kim S W, An S, et al. Flea-inspired catapult mechanism for miniature jumping robots[J]. IEEE Transactions on Robo-tics, 2012, 28(5): 1007-1018.  Watari E, Tsukagoshi H, Kitagawa A, et al. A higher casting and jump motions realized by robots using magnetic brake cylinder[J]. Journal of Mechanisms and Robotics, 2011, 3(4): 041002. Salton J R, Buerger S, Marron L, et al. Urban hopper[C]//Proceedings of SPIE. Bellingham, USA: SPIE, 2010: doi: 10.1117/12.855599. Shepherd R F, Stokes A A, Freake J, et al. Using explosions to power a soft robot[J]. Angewandte Chemie, 2013, 125(10): 2964-2968.  Tolley M T, Shepherd R F, Karpelson M, et al. An untethered jumping soft robot[C]//IEEE/RSJ International Conference on Intelligent Robots and Systems. Piscataway, USA: IEEE, 2014: 561-566. 魏敦文,葛文杰.跳跃机器人研究现状与趋势 [J].机器人,2014,36(4):503-512.Wei D W, Ge W J. Research status and development trend of hopping robots[J]. Robot, 2014, 36(4): 503-512. Spletzer B L, Fisher G J, Maritnez M A, et al. Hopping robot, USA: US 6247546 B1[P]. 2001-06-19. Ackerman E. Boston dynamics sand flea robot demonstrates astonishing jumping skills[OL]//IEEE Spectrum Robotics Blog. (2012-03-28) [2014-06-03]. http://spectrum.ieee.org/auto maton/robotics/military-robots/boston-dynamics-sand-flea-dem onstrates-astonishing-jumping-skills. 张克通.轮式移动弹跳机器人研究 [D].南京:南京航空航天大学,2010.Zhang K T. Research on wheeled hopping robot[D]. Nanjing: Nanjing University of Aeronautics and Astronautics, 2010. Tiliakos N, Tyll J S. Development and testing of a nitrous oxide/propane rocket engine[C]//37th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit. Reston, USA: AIAA, 2001: doi: 10.2514/6.2001-3258. Heywood J B. Internal combustion engine fundamentals[M]. New York, USA: McGraw-Hill, 1988.