Optimal Tension Estimation and Obstacle-Negotiation Ability Analysis on Deformable Tracked Wheelchair Robot
TENG Yun1,2, YAO Chen2, WANG Ting2, LI Xiaofan2
1. Graduate School of the Chinese Academy of Sciences, Beijing 100049, China; 2. State Key Lab of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110016, China
Abstract:An optimal estimation method is developed to dynamically determine track tension for a new type of deformable tracked wheelchair robot.Compared with traditional tracked mobile mechanism which keeps track tension constant,it can reduce power consumption obviously to determine tension dynamically.Considering the complexity in track tension modeling, a fuzzy logic decision making method is developed,which uses main influential factors on the track tension as its inputs. Then combining with least square method,an optimal estimation algorithm of track tension is obtained.Because of the low speed feature of the process when the wheelchair negotiates obstacle,a statics model of the wheelchair for the initial stage of climbing stairs is developed according to the result of the optimal track tension estimation algorithm.Simulation result proves that the wheelchair can climb stairs stably when it takes advantage of tension estimation algorithm.At the same time, it also shows that the power consumption is reduced greatly by dynamically determining the track tension.
[1] 苏和平,王人成.爬楼梯轮椅的研究进展[J]. 中国康复医学杂志,2005,20(5):366-367,i001.Su Heping,Wang Rencheng.Progress of wheelchair with climbing stairs ability[J]. Chinese Journal of Rehabilitation Medicine,2005,20(5):366-367,i001.
[2] Lawn M J,Ishimatsu T.Modeling of a stair-climbing wheelchair mechanism with high single-stcp capability[J]. IEEE Transactions on Neural Systems and Rehabilitation Engineering,2003,11(3):323-332.
[3] Ben-Tzvi P,Ito S,Goldenberg A A.Autonomous stair climbng with reconfigurable tracked mobile robot[C]//IEEE International Wbrkshop on Robotic and Sensors Environments.Piscataway,NJ,USA:IEEE,2007:104-109.
[4] Wang T,Wang Y C,Yao C.Study on mechanism of a mobile robot used in unstructured environment[C]//IEEE International Conference on Robotics and Biomimetics.Piscataway,NJ,USA:IEEE,2005:201-205.
[5] Huh K,Chung C C,Kim I M,et al.Track tension controller design and experimental cvaluation in tracked vehicles[J]. Journal of Dynamic Systems,Measurement and Control,Transactions of the ASME,2004,126(4):764-771.
[6] Huh K,Hung D G.Track tension estimation in tracked vehicles under various maneuvering tasks[J]. Journal of Dynamic Systems.Measurement and Control,Transactions of the ASME,2001,123(2):179-185.
[7] 欧长劲,吴海列,卢康.模糊神经网络张力控制系统[J]. 轻工机械,2006,24(4):102-105.Ou Changjin,Wu Hailie,Lu Kang.Simulation of tension control based on fuzzy neural network[J]. Light Industry Machinery,2006,24(4):102-105.
[8] 陈世荣,许曼,汪义平,等.轮式机器人越台阶控制与仿真[J]. 机械设计,2007,24(1):13-15.Chen Shirong,Xu Min,Wang Yiping,et al.Control and simulation on getting over flight of steps for whceled robot[J]. Journal of Machine Design,2007,24(1):13-15.