Optimization is the ultimate goal of any design that aims to obtain a maximum gain out of a system at minimum expense within a framework of physical laws that restrict an absolute multi-aspect gains. The current paper presents a design methodology for optimum performance of mechanical systems. Design optimization problems have been classified based on the nature of the relation between the parameters and the restrictions imposed by virtue of operation conditions and the complexity of weighing the competitiveness of design objectives. Three classes of optimization problems are introduced: direct (explicit), interacting (implicit), and comparative (modeling). Examples of each class are given and suggested approaches to tackle the solutions are presented. These examples cover a wide range of applications in mechanical systems and would help clarify the overall framework of problem-solution schemes frequently encountered in the design of machine components.

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