Met 305 tutorial_6-_turning_moment_diagrams

MET 305 MECHANICS OF MACHINES TUTORIAL .6

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TURNING MOMENT DIAGRAMS & FLYWHEEL

IntroductionThe turning moment diagram (also known as crank-effort diagram) is the graphical representation of the turning moment or crank-effort for various positions of the crank. It is plotted on Cartesian co-ordinates, in which the turning moment is taken as the ordinate and crank angle as abscissa.

Since the work done is the product of the turning moment and the angle turned, therefore the area of the turning moment diagram represents the work done per revolution. In actual practice, the


engine is assumed to work against the mean resisting torque, as shown by a horizontal line. The height of the ordinate represents the mean height of the turning moment diagram. Since it is assumed that the work done by the turning moment per revolution is equal to the work done against the mean resisting torque, therefore the area of the rectangle is proportional to the work done against the mean resisting torque.

Flywheel is mounted on the crank shaft of the engine. It stores the excess energy when the work done by the engine is more than the requirement (mean resisting torque) and releases it back when needed by the engine. When the flywheel stores the excess energy its speed increases and when it releases the energy its speed decreases. The flywheel keeps on increasing or decreasing the speed of the engine within reasonable limits.


maximum speed and minimum speed is known as maximum fluctuation of speed.

Met 305 tutorial_6-_turning_moment_diagrams

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