Design of an ergonomic control lever for wheel loader attachments

Content
1 Introduction ...............................................................................................................................9
1.1 Project background ................................................................................................. 9
1.2 Purpose and Goal .................................................................................................. 10
1.3 Question formulation .............................................................................................. 11
1.4 Delimitations ............................................................................................................ 11
1.5 Report outline .......................................................................................................... 12
2 Current situation ................................................................................................................... 13
2.1 Product functionality .............................................................................................. 13
2.2 Single lever screening ............................................................................................ 18
3 Theory ....................................................................................................................................... 21
3.1 Physical ergonomics ............................................................................................... 21
3.2 Cognitive ergonomics ............................................................................................ 27
3.3 Standards and recommendations ....................................................................... 29
4 Methods .................................................................................................................................... 31
4.1 Data collecting methods ....................................................................................... 31
4.2 Analysis methods .................................................................................................... 32
4.3 Idea generation methods ..................................................................................... 34
4.4 Concept evaluating methods .............................................................................. 35
5 Project implementation ...................................................................................................... 37
5.1 Description of procedure ....................................................................................... 37
6 Analysis..................................................................................................................................... 41
6.1 Human-machine system description .................................................................... 41
6.2 Wheel loader operators and task ......................................................................... 43
6.3 Physical ergonomics in wheel loaders ................................................................. 53
6.4 Cognitive ergonomics in wheel loaders .............................................................. 58
7 Problem definition................................................................................................................ 67
7.1 Conclusion from theory and analysis ................................................................... 67
7.2 Summary of needs .................................................................................................. 68
7.3 Design Heuristics ...................................................................................................... 71
8 Concept generation 1 ........................................................................................................... 73
8.1 Idea generation ...................................................................................................... 73
8.2 Concepts ................................................................................................................. 76
8.3 Concept selection .................................................................................................. 78
9 Concept generation 2 ........................................................................................................... 81
9.1 Idea generation ...................................................................................................... 81
9.2 Concepts ................................................................................................................. 84
9.3 Concept selection .................................................................................................. 86
10 Concept generation 3......................................................................................................... 87
10.1 Elaboration of needs from chapter 7.2 ................................................................ 87
10.2 Creation of functional prototype ......................................................................... 90
10.3 Detailed concept description ............................................................................... 92