Mechanical engineers are associated with the production and processing of energy and with providing the means of production, the tools of transportation, and the techniques of automation.The skill and knowledge are extensive. Among the disciplinary bases are machanics of solids and fluids, mass and momentum transport, manfacturing processes, and electrical and information theory. Mechanical engineering design involves all disciplines of mechanical engineering.
Real problems resist compartmentalization. A simple journal bearing involves fluid flow, heat transfer, friction, energy transport, material selection, thermomechanical treatments, statistical descriptions and so on.Similarly there are phases such as machine design, machine-element design, machine-component design, system design and fluid-power design. All of these phases are somewhat more focused examples of mechanical design.
What is a design process? How does it begin? Does the engineer simply sit down at a desk with a blank sheet of paper and jot down some idea? What happens next? What factors influence or controls decisions that have to be made? Finally, how does the design process end?
The complete design process, from start to finish is show in the figure below: