P. Nikravesh, AME, U of A Mechanical systemsIntroduction Mechanical Systems This presentation describes some of the fundamental components and definitions.

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Presentation transcript:

P. Nikravesh, AME, U of A Mechanical systemsIntroduction Mechanical Systems This presentation describes some of the fundamental components and definitions of mechanical systems and mechanisms such as: 1. Links or bodies 2. Kinematic joints (pin, sliding, pin-sliding) 3. Open and closed chains 4. Commonly used mechanisms

P. Nikravesh, AME, U of A Mechanical systems link 1 link 3 link 4 link 2 Pin and sliding joints A mechanical system consists of links (bodies) connected by joints. In this course all links are assumed non deformable (rigid). We mostly use two types of joints: Revolute (pin) joint Sliding joint: ► Pin and sliding joints ►

P. Nikravesh, AME, U of A Mechanical systems Pin-sliding joint Two links of a mechanical system may be connected by a combined pin-sliding joint. The joint provides rotational motion as a pin joint. It also provides sliding motion. And it also provides both rotational and sliding motions simultaneously. Pin-sliding joint ► ► ► link 5 link 6

P. Nikravesh, AME, U of A Mechanical systems Open and closed chains Mechanical systems can be categorized into open chains, closed chains, or combinations of open and closed chains. open chain example closed chain example Open and closed chains

P. Nikravesh, AME, U of A Mechanical systems Closed chain systems A system may have one or more closed chains (loops). By definition a mechanism contains only closed chains. single loop mechanism double loop mechanism Closed chains (mechanisms)

P. Nikravesh, AME, U of A Mechanical systems link 1O2O2 O4O4 Commonly used mechanisms Four-bar: A four-bar is a mechanism that consists of four links connected by four pin joints. Usually only three of the links are allowed to move. The links are numbered clockwise with the nonmoving link being link 1. Slider crank: A slider crank (or crank-slider) is a mechanism that consists of four links connected by three pin joints and one sliding joint. Usually only three of the links are allowed to move. The links are numbered clockwise with the nonmoving link being link 1. Commonly used mechanisms O2O2