TAILIEUCHUNG - LEGO MINDSTORMS - Building Robots Part 9

Tham khảo tài liệu 'lego mindstorms - building robots part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 280 Chapter 15 Building Robots That Walk Introduction So far in this book we have discussed in depth many mobility configurations all of them based upon one of the most important inventions of humankind the wheel. In this chapter we will try and emulate what nature invented long before the wheel to provide humankind with a mode of transportation legs Legged robots are rather unpractical for all but some special applications but there s much to learn in designing and building a walking robot and the matter is both challenging and fascinating. This chapter owes a lot to all the great designers who published their creations on the net and patiently explained their choices through text and pictures including Joe Nagata Jin Sato Kazuhiro Umeda Miguel Agullo and many others. The Theory behind Walking How can one define walking It s the process of lifting a leg from the ground while one or more other legs support the body. When the leg has been lifted it gets advanced and lowered back to the ground. From there the process continues with another leg and so on. The crucial point is this What prevents a creature from falling down when a leg is lifted To discover this we need to introduce some basic concepts from a branch of physics called statics which explains the laws of balance. The weight of an object is the resulting effect of the force of gravity against the mass of the describe a force you need to determine three variables its intensity its direction and its point of application. For example if you want to move a piece of furniture in your room the intensity is the amount of strength you must apply to make it move the direction is the bearing of the course you re pushing it on and the point of application is where you place your hands to apply the force. Returning to gravity its intensity is proportional to the mass of the object. Its direction points vertically downward but where is its application point To answer this question you should consider an object

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