臺灣博碩士論文加值系統

This research investigates the effect of operating policies in traditional and nontraditional warehouse layouts. Operational policies that are considered include storage allocation policy, picking strategy, and picker routing policy. Traditional layouts have vertical picking aisles and cross aisle perpendicular to picking aisles. Nontraditional aisle layouts may have nonparallel picking aisles and inclined cross aisles.
Our study considers both unit-load and less-than-unit-load warehouses. For unit-load warehouses, the analysis embraces the assumptions of having multiple P&;D points, in combination with random and turnover-based storage policies in different scenarios of demand patterns. Results that the fishbone layout efficiency is slightly better the traditional layouts when there is a P&;D point in the lower center and the rest in the upper side of the warehouse. When every P&;D point is located in the upper side of the warehouse, the traditional layouts perform the best.
We introduce the rotated fishbone (RF) layout for the specific case of having two P&;D points at the upper corners of the warehouse. The RF layout shows to be more efficient than other layouts under unit-load operations.
Assuming a single centrally located P&;D point, we demonstrate that the fishbone layout is able to perform better than traditional layouts for order-picking systems, having a considerable advantage when there is turnover-based storage and the demand pattern of items is noticeably skewed.

Our results suggest that warehouses with two P&;D points at the upper corners and multi-command cycles are mostly efficient when utilizing a traditional layout with a middle cross aisle. The performance of nontraditional layouts is shown to be very poor for multi-command cycles and two P&;D points in the upper corners.

This research investigates the effect of operating policies in traditional and nontraditional warehouse layouts. Operational policies that are considered include storage allocation policy, picking strategy, and picker routing policy. Traditional layouts have vertical picking aisles and cross aisle perpendicular to picking aisles. Nontraditional aisle layouts may have nonparallel picking aisles and inclined cross aisles.
Our study considers both unit-load and less-than-unit-load warehouses. For unit-load warehouses, the analysis embraces the assumptions of having multiple P&;D points, in combination with random and turnover-based storage policies in different scenarios of demand patterns. Results that the fishbone layout efficiency is slightly better the traditional layouts when there is a P&;D point in the lower center and the rest in the upper side of the warehouse. When every P&;D point is located in the upper side of the warehouse, the traditional layouts perform the best.
We introduce the rotated fishbone (RF) layout for the specific case of having two P&;D points at the upper corners of the warehouse. The RF layout shows to be more efficient than other layouts under unit-load operations.
Assuming a single centrally located P&;D point, we demonstrate that the fishbone layout is able to perform better than traditional layouts for order-picking systems, having a considerable advantage when there is turnover-based storage and the demand pattern of items is noticeably skewed.

Our results suggest that warehouses with two P&;D points at the upper corners and multi-command cycles are mostly efficient when utilizing a traditional layout with a middle cross aisle. The performance of nontraditional layouts is shown to be very poor for multi-command cycles and two P&;D points in the upper corners.

Dedication i
Acknowledgement ii
Table of Contents iii
List of Figures vi
List of Tables ix
Abstract xii
Chapter 1. Introduction 1
1.1 Motivation 1
1.2 Research Background 3
1.3 Warehousing Terminology 5
1.3.1 Warehouse Factors and Decisions 6
1.4 Research Objectives 7
1.5 Thesis Organization 8
Chapter 2. Literature Review 9
2.1 Warehouse Layout 9
2.2 Storage Policies 12
2.3 Picking Strategies 14
2.4 Picker Routing Policies 16
2.5 Summary 18
Chapter 3. Research Methodology 20
3.1 Assumptions 20
3.2 Warehouse Aisle Layouts 21
3.3 Warehouse Characteristics 23
3.4 Order Pickers and Routing 27
3.5 Demand Model 28
3.5.1 Application of Demand Patterns 29
3.6 Travel Distance Models 30
3.7 Experimental Design 31
Chapter 4. Discussion and Analyses of Results 34
4.1 Unit-load Warehouses with more than one P&;D Point 34
4.1.1 Validation for Unit-load Warehouses 34
4.1.2 Unit-load Warehouses 37
4.2 Less-than-unit-load Warehouses 54
4.2.1 Program Validation 54
4.2.2 Warehouses with Multi-command Cycles 55
4.2.3 Warehouses with Two P&;D Points 61
Chapter 5. Conclusions and Future Research 68
5.1 Conclusions 68
5.2 Future research 71
References 73
Appendix 79
Appendix A. Validation results for warehouses with a single P&;D 79
Appendix B. Unit-load warehouses with two P&;D points 81
Appendix C. Unit-load warehouses with two P&;D points and zone picking 82
Appendix D. ANOVA for unit-load warehouses with two P&;D points at the corners 84
Appendix E. Unit-load warehouses with multiple P&;D points 91
Appendix F. ANOVA for unit-load warehouses with multiple P&;D points 95
Appendix G. Less-than-unit-load warehouses with asingle P&;D point.. 102
Appendix H. ANOVA pairwise comparisons of factors for less-than-unit-load warehouses with one P&;D point 123
Appendix I. Less-than-unit-load warehouses with two P&;D points at the upper corners 128
Appendix J. ANOVA pairwise comparisons for less-than-unit-load warehouses with two P&;D points 142

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