Mechanical engineering 

Mechanical engineering is the application of physical principles to the creation of useful devices, objects and machines. Mechanical engineers use principles such as heat, force, and the conservation of mass and energy to analyze static and dynamic physical systems, in contributing to the design of things such as automobiles, aircraft, and other vehicles, heating and cooling systems, household appliances, industrial equipment and machinery, weapons systems, etc.

Mechanical engineers often create simulations of the operation of objects, as well as the manufacturing processes to be used, in order to optimize performance, cost effectiveness, and energy efficiencies, before settling on a particular design.

Engineering drawings of the objects to be fabricated are typically created. Prior to the late 20th Century most engineering drawings were drawn by hand with the aid of mechanical drafting boards[?]. The advent of the digital computer with graphical user interface made the creation of models and drawings using Computer Aided Design (CAD) programs possible. Most CAD programs now permit creation of three-dimensional models which may be viewed from any angle. Such models may be used as the basis for Finite Element Analysis (FEA) of the design. Through the application of Computer Aided Manufacture[?] (CAM), the models may also be used directly by software to create "instructions" for the manufacture of objects represented by the models, through computer numerically-controlled (CNC) machining or other automated processes, without the need for intermediate drawings.

Fundamental subjects of mechanical engineering include: heat transfer, fluid mechanics, solid mechanics[?], pneumatics, hydraulics and applied thermodynamics.

Related disciplines include; Electrical engineering, Industrial engineering, Systems engineering Civil engineering, Aerospace engineering, and other engineering disciplines.

See also

• List of mechanical engineers
• patent
• List of inventors