Mechanical Design Lecture (1) Chapter (1) : Design Process By Dr. Abdel-Rahman Ibrahim Abdel-Bary

References Dan B Marghitu, Mechanical Engineerʹs Handbook, Department of Mechanical Engineering, Auburn University, Auburn, Alabama, 2001. Peter R. N. Childs, Mechanical Design, University of Sussex UK, 2004. Bodynas & Nisbett, Mechanical Engineering design, Mc Graw-Hill, New York 2006. B. J. Hancock, B. Jaconson, and S. R. Schmid, Fundamentals of Machine Elements, McGraw-Hill, New York, 1999. W. H. Middendorf and R. H. Englemann, Design of Devices and Systems. Marcel Dekker, New York, 1998. R. L. Mott, Machine Elements in Mechanical Design. Prentice-Hall, Upper Saddle River, NJ, 1999. R. L. Norton, Machine Design. Prentice-Hall, Upper Saddle River, NJ, 2000 C. W. Wilson, Computer Integrated Machine Design. Prentice Hall, Upper Saddle River, NJ, 1997. D. B. Marghitu and M. J. Crocker, Analytical Elements of Mechanisms, Cambridge University Press, 2001.

Introduction  This text is intended for students beginning the study of mechanical engineering design. The focus is on blending fundamental development of concepts with the practical specifications of components. Students of this text should find that it inherently directs them into familiarity with both the basis for decisions and the standards. For this reason, as the students transfer to practicing engineers, they will find that this text is indispensable as a reference text. The objectives of the text are to: 1. Cover the basics of machine design, including the design process, engineering mechanics and materials, failure prevention under static and variable loading, and characteristics of the principal types of mechanical elements. 2. Offer a practical approach to the subject through a wide range of real-world applications and examples. 3. Encourage students to link design and analysis. 4. Encourage students to link fundamental concepts with practical component specifications.  

Introducing course subjects- Introduction- Design Process Lecture (1) Introducing course subjects- Introduction- Design Process Objectives of lecture (1) : Studying lecture (1) the student should learn : The subjects of course that should be studied. The objectives of the studying the course. The design process and be able to apply for design of some mechanical components through course.

Chapter (1) Design Process 1.1 The Procedure of Design The process of design of mechanical systems or machines consists of a few steps to be followed in order: 1. Recognition: - Recognition the need. - Description of problem statement. 2. Synthesis - Identifying all possible solutions and making a list. - Selecting mechanism or mechanisms for analysis of motions and forces. 3. Calculations - Select Material - Determine permissible values of forces or stresses - Determine Sizes and dimensions

4. Revision and Modification The results of calculations are checked against information from the relevant source or sources. The results of calculations Should fit to standards The dimension may be modified to suit standards- Check availability of material in certain sizes and shapes Standards are available from professional institutions, organizations and manufactures of standard elements. 5. Report The mechanical designs are best reported by drawings and standard methods for specifying material and special manufacturing process.

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