Wednesday, January 28, 2015
Static Force Analysis
The analysis is aimed at determining the forces transmitted from one point to another,
essentially from input point to out put point. This would be the starting point for strength
design of a component/ system, basically to decide the dimensions of the components
Force analysis is essential to avoid either overestimation or under estimation of forces on
machine member.
Under estimation: leads to design of insufficient strength and to early failure.
Overestimation: machine component would have more strength than required.
Over design leads to heavier machines, costlier and becomes not competitive
Graphical analysis of machine forces will be used here because of the simplification it offers to
a problem, especially in cases of complex machines. Moreover, the graphical analysis of
forces is a direct application of the equations of equilibrium.
General Principle of force analysis:
A machine / mechanism is a three dimensional object, with forces acting in three dimensions.
For a complete force analysis, all the forces are projected on to three mutually perpendicular
planes. Then, for each reference plane, it is necessary that, the vector sum of the applied forces
in zero and that, the moment of the forces about any axis perpendicular to the reference plane or
about any point in the plane is zero for equilibrium.
where F= force and M= moment
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