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Engineering Design Principles 1st Edition by Ken Hurst.
Chapter 1 Introduction to engineering design
Chapter 2 Problem identification
Chapter 3 Creativity
Chapter 4 Concept selection
Chapter 5 Embodiment
Chapter 6 Modelling
Chapter 7 Detail design
Chapter 8 Design management
Chapter 9 Information gathering
Chapter 10 Presentation techniques
“Description of each chapter”.
Chapter 1 Introduction to engineering design:
In this introductory chapter the engineering design process which is covered in detail later is defined. A historical perspective is taken to explain the need for a formal process and the complexity of current engineering is outlined. A definition is given for both the engineering design process and the duties of an engineering designer. Design is defined as a technology, not a science, and accepted models of the process are presented. Finally the levels of communication necessary for successful engineering design are illustrated.
Chapter 2 Problem identification:
Here the processes necessary for the definition of a Product Design Specification (PDS) are detailed. As a prelude to writing the PDS much research must be carried out and much information gathered. This is a continual process and is described in Chapter 9. In this chapter the required contents of a PDS are explained and the format of a PDS illustrated by example. The writing of a PDS is the essential first step in every design project.
Chapter 3 Creativity:
Included in this chapter are many of the methods which can be used by individuals or groups in order to increase their creativity and obtain potential solutions to problems. These methods are illustrated by examples and include lateral thinking, avoiding ^set% inversion, analogy, empathy, fantasy, freewheeling, brainstorming, morphology and synthesis. The chapter finishes with presentation techniques for concepts, illustrated by the on-going example of the seat suspension mechanism.
Chapter 4 Concept selection:
This chapter illustrates decision-making support methods for design concept selection using two case studies, that of fixing a gear to a shaft and the seat suspension mechanism introduced earlier. The argument that decisions can be made subjectively is refuted and the more popular formal concept selection methods are presented. These include the use of a decision tree, the datum method and design evaluation using a Harris diagram. A two stage approach is recommended in which the criteria from the specification are ranked and weighted and then, following design concept generation, each concept is evaluated against these criteria. Finally, the advantages of using a spreadsheet package on a personal computer coupled with the recommended method are highlighted.
Chapter 5 Embodiment:
A more detailed analysis of the selected concept(s) is undertaken in the embodiment stage of the design process. Subjects covered include form design, design for manufacture and assembly, materials and process selection and industrial design. However, the main aim of this chapter is to establish concept development as a distinct stage in the design process by identifying the steps and rules employed. Materials and process details are not included since this information is obtainable elsewhere. Design is not solely the achieving of technical solutions but also creating useful products which satisfy and appeal to their users. There are three broad areas of design activities, technical, ergonomic and aesthetic. The overlap area of ergonomics between the engineering and industrial designer is also covered.
Chapter 6 Modelling:
There are three main methods of modelling covered in this chapter. Mathematical modelling, where equations are developed and tested within stated assumptions, is illustrated using the example of a pillar drill. Within this category of modelling it is sometimes possible to define equations which fully constrain the problem. The identification and subsequent solution of these equations leads to an ‘optimum’ solution. The second modelling method presented involves the creation of 2D and 3D scale models which are illustrated by means of a linkage mechanism and a wooden model of a car in a wind tunnel respectively. Finally, simulation using computers is discussed.
Chapter 7 Detail design:
Statistical assessment of the probability of failure is presented as an alternative to the use of factor of safety. The emphasis is on a better understanding of the limiting factors associated with the design. Quality and reliability are presented together and distinction drawn between the two. The most common mode of failure for structural components is by cyclic loading or fatigue. The chapter includes a section covering avoidance of stress concentrations using pipe flow analogy. High cycle fatigue life prediction is the main subject matter.
Chapter 8 Design management:
Two different levels of design project management are presented, those most appropriate for student project work and those more advanced methods employed by companies. The relatively new International Standards covering design for quality are explained and the engineering design management control process outlined. Techniques covered include project planning and control by means of bar charts and Programme Evaluation and Review Technique (PERT) network analysis. An introduction to Quality Function Deployment (QFD) is presented, the requirements for formal design reviews are explained and the Value Analysis technique discussed.
Chapter 9 Information gathering:
Two separate modes of information gathering are presented, the need for information surrounding a particular problem and the general updating of information which must be continuous on both a personal and design team basis. The general information gathering process is outlined as defining the purpose of the search, searching, locating, obtaining, rejecting the irrelevant, filing the information and highlighting for easy reference. In the definition of a PDS the information which must be consolidated starts with the design brief and includes the context of the product, matters of confidentiality, the product development and any specific company requirements. Sources of information are identified as libraries, encyclopaedias, handbooks, journals, indexes, component suppliers, standards, patents and databases.
Chapter 10 Presentation techniques:
Drawing morphology, types of engineering design drawings and graphical presentation are covered. The aim is to enable you to present a coherent design report with drawings which will satisfy a ‘customer’, even if that ‘customer’ is a design office manager or technical director. The reasons for keeping clear records have been explained in earlier chapters: what constitutes a thorough design project report is presented here. The types of drawings and reports are illustrated by two further case studies.
Engineering Design Principles by Kenneth S. Hurst pdf.
⏩Author: Ken Hurst
⏩Publisher: Butterworth-Heinemann; 1 edition (June 11, 1999)
⏩Puplication Date: June 11, 1999
⏩Size: 9.69 MB
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