TAILIEUCHUNG - Adaptive Motion of Animals and Machines - Hiroshi Kimura et al (Eds) Part 6

Tham khảo tài liệu 'adaptive motion of animals and machines - hiroshi kimura et al (eds) part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 98 Rolf Pfeifer lean Collins et al. 2001 . This kind of walking is very energy efficient the robot is - loosely speaking - operated near one of its Eigenfrequencies and there is an intrinsic naturalness to it perhaps the natural feel comes from the exploitation of the dynamics . the passive swing of the leg. . However its ecological niche . the environment in which the robot is capable of operating is extremely narrow it only consists of inclines of certain angles. A different approach has been taken by the Honda design team. There the goal was to have a robot that could perform a large number of different types of movements. The methodology was to record human movements and then to reproduce them on the robot which leads to a relatively natural behavior of the robot. On the other hand control - or the neural processing if you like - is extremely complex and there is no exploitation of the intrinsic dynamics as in the case of the passive dynamic walker. The implication is also that the movement is not energy efficient. Of course the Honda robot can do many things like walking up and down the stairs pushing a cart opening a door etc. whereas the ecological niche of the passive dynamic walker is confined to inclines of a particular angle. Fig. 1. Two approaches to robot building. a The passive dynamic walker Collins et al. 2001 b the Honda robot Asimo. In term of the design principles this case study illustrates the principles of cheap design and ecological balance. The passive dynamic walker fully exploits the fact that it is always put on inclines that provide its energy source and generates the proper dynamics for walking. Loosely speaking we Jumping Walking Dancing Reaching Moving into the Future 99 can also say that the control tasks the neural processing is taken over by having the proper morphology and the right materials. In fact the neural processing reduces to zero. At the same time energy efficiency is achieved. However if anything is changed . .

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