PSE IA Textbook Preface
Managers of production systems are well aware that to ensure high productivity they must:
As a preview of what you will learn from this volume, answer the questions listed below. If you are not sure how to answer – don’t worry: even “manufacturing gurus” did not answer them! (That is why we use the subtitle “What manufacturing gurus did not teach you about managing production systems.”) After studying this textbook, you will be able to answer these questions with ease.
Question 1: In a serial production line with identical machines and identical buffers, which machine is the bottleneck? If the machines are not identical, is the worst machine necessarily the bottleneck?
Question 2: To maximize production system’s throughput, would you prefer machines with long or short up- and downtime, provided that their stand-alone throughput remains the same?
Question 3: To maximize the throughput, would you allocate work so that buffers are full, or empty, or neither? In the latter case, which buffer occupancy indicates that work is allocated optimally? Similarly, which buffer occupancy indicates the best buffer capacity allocation?
Question 4: How would you select lean buffering for a production system? For example, are buffers of capacity 1000 parts lean? How about a buffer of capacity 10?
Question 5: In a production system with parts transported on carriers, how would you select the number of carriers so that throughput is maximized?
As you will learn from this textbook, some of these questions can be answered without any measurements or calculations – just based on fundamental laws that govern production systems, such as laws of reversibility, monotonicity, and improvability. Others require measurements, typically, machines’ up- and downtime, or blockages and starvations, or buffers’ occupancy. Still others are based on both measurements and calculations. To assist calculations, we have created the FFM Toolbox (see www.ProductionSystemsEngineering.com), which is an essential part of this textbook.
The outline of this volume is as follows: Preliminaries are included in Chapter 1; here standard types of production systems are described, unified terminology is established, and methods for performance analysis (using the FFM Toolbox) are discussed. Chapter 2 presents fundamental laws of production systems; these laws allow us to understand and predict the system’s behavior. Chapters 3-5 address issues of bottlenecks, leanness, and product quality, respectively; the methods described here allow managers to design continuous improvement project with guaranteed results. Production lines with carriers are analyzed in Chapter 6; here we show how one can manage the number of carriers in the system so that neither starvations nor blockages by carriers takes place. Chapters 7 and 8 address the issues of production lead time and multi-job manufacturing systems. In Chapter 9, methods for mathematical modeling of production systems are discussed; these methods allow analysts to represent any production system by one of the standard types introduced in Chapter 1 and investigated in Chapters 2-8. Finally, Chapter 10 summarizes the results, and the Index and Glossary list the terms and abbreviations used throughout the book.
Each of these chapters begins with a motivation and overview. Then, methods related to the subject matter and the corresponding FFM Toolbox functions are discussed. Next, case studies are outlined. Finally, a set of problems is provided to be solved using, in most cases, the FFM Toolbox.
During the last twenty-five years, we have applied the methods described in this book to dozens of production systems in large, medium, and small manufacturing organizations. These include GM, Ford, Chrysler, Toyota, MillerCoors, Kraft Foods, Kroger, Lexmark, Subzero, Ruud Lighting, HellermannTyton, etc. Consistently, significant improvements in productivity, quality, and customer demand satisfaction have been obtained. Learning and using these methods, you will be able to do the same.