Mechanical Design of Machine Elements and Machines
1-1. Define engineering design and elaborate on each important concept in the definition.
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Solution
(Ref. 1.2) Engineering design is an iterative decision-making process that has the objective of creating and optimizing a new or improved engineering system or device for the fulfillment of a human need or desire, with regard for conservation of resources and environmental impact.
The essence of engineering (especially mechanical design) is the fulfillment of human needs and desires. Whether a designer is creating a new device of improving an existing design, the objective is always to provide the “best”, or “optimum” combination of materials and geometry. Unfortunately, an absolute optimum can rarely be achieved because the criteria of performance, life, weight, cost, etc. typically place counter-opposing demands upon any proposed combination of material and geometry.
Designers must not only compete in the marketplace, but must respond to the clear and growing obligation of the global technical community to conserve resources and preserve the environment.
Finally, iteration, or cut-and-try pervades design methodology. Selection of the best material and geometry are typically completed through a series of iterations.
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