The Mechanical Design Process

INTRODUCTION

Beginning with the simple potter's wheel and evolving to complex consumer products and transportation Systems, humans have been designing mechanical objects for nearly five thousand years. Each of these objects is the end resuit of a long and often difficult design process. This book is about that process. Regardless of whether we are designing gearboxes, heat exchangers, satellites, or doorknobs, there are certain techniques that can be used during the design process to help ensure successful results. Since this book is about the process of mechanical design, it focuses not on the design of any one type of object but on techniques that apply to the design of ail types of mechanical objects.

If people have been designing for five thousand years and there are literally millions of mechanical objects that work and work well, why study the design process? The answer, simply put, is that there is a continuous need for new, costeffective, high-quality products. Today's products have become so complex that most require a team of people from diverse areas of expertise to develop an idea into hardware. The more people involved in a project, the greater is the need for assistance with communication and for structure to ensure that nothing important is overlooked. In addition, the global marketplace has fostered the need to develop new products at a very rapid and accelerating pace. To compete in this market, a company must be very efficient in the design of its products. It is the process that we will study here that determines the efficiency of new product development. Finally, it has been estimated that 85 percent of the problems with new products not working as they should, taking too long to bring to market, or costing too much are the result of a poor design process.

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