162A -Introduction - 2

162A -Introduction - 2 - 162A. Introduction to Mechanisms...

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Unformatted text preview: 162A. Introduction to Mechanisms and Mechanical Systems Chapter 1: Introduction Machines vs. Mechanisms ! Complex machines from cars to helicopters to machine tools contain many mechanisms ! It may not be obvious that mechanisms are also found in consumer goods such toys, cameras, printers and so on ! Many hand tools such as screw drivers, wrenches, jacks and hammers are actually true mechanisms ! Hands, feet, legs and jaws of humans can qualify as functioning mechanisms ! All machines perform work. Only some mechanism may perform work, but all mechanisms transform motion. Kinematic Representation ! Simplification of mechanism to show only what is relevant kinematicallymeaning what is necessary for defining the motion ! De-emphasize the actual shapes, but the joints and the lengths of links between joints are important ! Pros & Cons Kinematic Representation of a 4-bar linkage Kinematic Representation of a revolute joint Some Other Kinematic Representations Kinematic representation - real life example http://newholland.com Four-bar linkage ! A four-bar linkage is the simplest movable linkage. It consists of four rigid bodies (called bars or links), each attached to two others by single joints or pivots to form a closed loop. ! Four-bars are simple mechanisms common in ME machine design and fall under the study of kinematics. ! If each joint has one rotation d.o.f., then the mechanism is planar. One body typically does not move (called the ground link , fixed link , or the frame ), so the position of only one other body is needed to find all positions. The two links connected to the ground link are called grounded links . The remaining link, not directly connected to the ground link, is called the coupler link . In terms of mechanical action, one of the grounded links is selected to be the...
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162A -Introduction - 2 - 162A. Introduction to Mechanisms...

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