Materials Information for CAD/CAM (eBook)

Front Cover 1
Materials Information for CAD/CAM 4
Copyright Page 5
Table of Contents 6
Preface 8
Chapter 1. Introduction and reader's guide 10
Materials and design 11
Design and manufacture 11
How this book is organized 13
Chapter 2. Materials selection 16
Introduction 16
Databases for materials selection 16
Practical issues 17
Transparent toy bricks 18
Indented aluminium 18
Concurrent engineering 19
Concurrent materials selection 20
Data for design 21
Design stages 22
The Ashby methods 24
Five more techniques 28
Selection extends over time 32
From data to information 35
Materials Identification 36
Chapter 3. Representing information 38
Representation and integration 38
Materials information 39
State and process 44
Structure-sensitive properties 45
Promising directions 46
Less promising directions 47
Ill-structured problems 47
Open questions 48
Relationships and adequacy 49
Names and values 51
Data modelling 52
Functional dependency 53
Partial identity 54
Relational data model 54
Normalization and normal forms 54
Hierarchies and catalogues 56
Naming and meaning 60
Term definition 61
Common vocabularies 62
Conceptual data modelling 62
McCarthy's data thesaurus 66
Chapter 4. Data interchange technologies 68
Background 69
Generic interchange problems 69
Item based formats 74
Table based formats 81
Conclusions on format types 83
History of data interchange 84
Techno-economic materials data 86
Open distributed processing 86
Chapter 5. Decisions and selection 88
Introduction 88
Background 88
Decision analysis 89
Rationality 89
Human judgement 90
The selection problem 90
Multi-attribute problems 91
Theorems and pitfalls 94
Predefined value functions 104
Normalization and updating 106
Materials selection 107
The PERITUS functions 111
Proposal 115
Summary 117
Chapter 6. Information quality 118
Background 118
Quality and data interchange 123
Survey of studies of data quality 124
Data quality levels 129
Data reporting and identification 134
Quality indicators 135
Organizations, staff and procedures 136
Conclusions on information quality 138
Chapter 7. Knowledge-based systems 140
Introduction 140
Maintenance and explanation 141
Models: types of expert system 142
Fragility 144
Tutorial systems 144
Big systems 145
Combined Knowledge/Databases 146
The future 148
Chapter 8. CAD/CAM environments 150
Introduction 150
Trends in design environments 151
Why feedback information is important 155
Capricious and stable information 158
Creating information components 160
Foretelling the future 161
Glossary 164
References 166
Index 174