xv
Preface
In today’s business world, competitiveness denes the industrial leading
edge. The drive toward maximum efciency is constantly at the forefront
of such companies’ objectives. Engineering professionals across the coun-
try are striving to adopt Lean manufacturing practices to help address
worries about their bottom line. Cellular manufacturing is one staple of
Lean manufacturing.
Cellular manufacturing (CM) is an approach that helps build a vari-
ety of products with as little waste as possible. A cell is a group of work-
stations, machine tools, or equipment arranged to create a smooth ow
so families of parts can be processed progressively from one workstation
to another without waiting for a batch to be completed or requiring addi-
tional handling between operations. Put simply, cellular manufacturing
integrates machinery and a small team of staff, directed by a team leader,
so all the work on a product or part can be accomplished in the same cell,
which eliminates resources that do not add value to the product.
Cellular manufacturing is a modern manufacturing system that
incorporates group technology (GT) principles. Cellular manufacturing is
a reorganizational manufacturing system of the traditional complex job-
shop and ow- shop manufacturing systems. The efcient ow of material
through a manufacturing process and its physical plant reduces material
handling costs and creates a more orderly work environment. Sometimes,
a group of operations can be conveniently grouped together so that raw
material enters one end and nished products exit the other end. In addi-
tion, they may be arranged in a physical layout that reduces manual
labor input. Such a grouping of equipment and operations is known as
a “production cell.” Compared to discontinuous ow through discrete
operations, material ow in cells is improved. Savings opportunities arise
from the elimination of downtime between operations, decreased mate-
rial handling costs, decreased work- in- progress inventory and associated
costs, reduced opportunity for handling errors, decreased downtime
spent waiting for supplies or materials, and reduced losses from defective
or obsolete products.
xvi Preface
Decision making under risk and decision making under uncertainty
are applied to cellular manufacturing, specically in the machine cell for-
mation step. The application works with part demand, which can be either
expressed in a probability distribution (probabilistic production volume)
or not expressed in probability distribution, where only the different pos-
sible values for volume that can occur are known (uncertain production
volume). Decision making under risk is used to help the designer select
the best cell arrangement in the case of probabilistic production volume,
whereas decision making under uncertainty is used to help the designer
select the best cell arrangement in the case of uncertain production vol-
ume. The objective of the design methodology has been to maximize the
prot imposed by the resource capacities constraints.
I am sharing this new book with you. It is a concise yet unique reference
incorporating decision making under risk into cellular manufacturing.
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