Mechanical Principles Assignment 4

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Mechanical Principles Assignment 4 In this essay ill be looking at the dynamic parameters of rotating systems for the following categories: * Plane mechanisms * Balancing * Flywheels * Effects of coupling Plane Mechanisms Plane mechanisms e.g. slider-crank, four-bar linkage and quick return mechanisms; determination of magnitude and nature of output velocity for given input conditions. A mechanism is used to produce mechanical transformations in a machine. This transformation could be any of the following. * It may convert one speed to another speed. * It may convert one force to another force. * It may convert one torque to another torque. * It may convert force into torque. * It may convert one angular motion to another angular motion. * It may convert angular motion into linear motion. * It may convert linear motion into angular motion. Slider-crank mechanism, arrangement of mechanical parts designed to convert straight-line motion to rotary motion, as in a reciprocating piston engine, or to convert rotary motion to straight-line motion, as in a reciprocating piston pump. An example can be seen in Fig 1. (Fig 1. Crank, connecting rod and piston mechanism.) If the crank is turned, angular motion is converted into linear motion of the piston and input torque is transformed into force on the piston. If the piston is forced to move, the linear motion is converted into rotary motion and the force into torque. A four bar mechanism consists of four rigid link which are linked in the form of a Quadrilateral by four pin joints. A link that makes complete revolution is called crank, the link opposite to the fixed link is the coupler and forth link is a lever or rocker if oscillates or another crank if rotates. (encylopaedia britannica) (Fig 2. Basic four bar link.) A worked example of how
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