2. Computer Integrated Manufacturing (CIM) has received much
attention in the last decade. A company that adopts CIM
practices is supposed to operate in an innovative and
technologically advanced manner. However, if such practices are
not carefully designed and implemented, they might end up
being costly and non-profitable. As a result, a company that
intends to adopt a CIM environment needs to spend considerable
time in analyzing the various tradeoffs prior to implementing
such a system. This project considers a CIM network for a large
corporation, which is implemented in a Network Simulation tool,
and analyzes the Quality of Service tradeoffs in the system by
means of simulation. The following sections will first provide a
brief description of CIM systems and then explain the
architecture of the system that has been considered for this
project.
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3. At this point, one might wonder what is Computer
Integrated Manufacturing. There is actually no precise
definition of the concept of CIM. As Riley and Cox state: "Ask
twenty engineers, twenty managers and twenty information
technology specialists to define the concept of CIM, and you'll
get sixty different answers.“ However, CIM is well described
by Melnyk and Narasimhan "The computer assisted
integration of the production process and operations control
functions needed for optimal deployment and productive use
of the minimum manufacturing and management
resources required to meet specific strategic business
objectives.“ In other words, when implementing CIM, a
company uses computers in an effort to benefit from
increased flexibility, improved quality, reduction in
inventory, reduction in space needed shorter lead times
and increased productivity.
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4. As you see here it is a car factory in China and we can see that
most of the work has done with machines ……
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5. For the purposes of this project, a CIM network for a large
corporation was considered for implementation in the OPNET
modeler simulation tool, for Quality of Service study and
analysis. The corporation’s CIM network consists of a series
of layers, which may be spread over large geographical areas.
More specifically and beginning from the very bottom layer,
the corporation network consists of the following layers:
1. Manufacturing or Assembly Cell layer.
2. Section or Factory Floor layer.
3. Factory or Facility layer.
4. Corporation layer.
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6. The cell layer is the lowest layer of the network
hierarchy and is responsible for the
end-product manufacturing. In order to perform its
manufacturing task, the manufacturing
cell utilizes various machines, which are directly
controlled by computers As seen in the diagram, the
manufacturing cell consists of the following devices:
· Cell Controller
This component of the manufacturing cell may be
considered as the “brains” of the
cell’s operation. Most of the tasks performed in the
cell are controlled and monitored by this component.
Additionally, the cell controller is able to communicate
with the
upper layers of the network hierarchy.
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7. It is our target to perform the production with the
highest level of quality…
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8. Directly above the cell layer in the corporation’s
network layering hierarchy is the
section layer. Sections consist of a group of
manufacturing cells, which perform functionally
related tasks and vary from 10 to 30. In addition,
sections employ a section
controller, which in a similar fashion to the cell
controller, monitors the section’s operation
and interacts with adjacent or upper layers
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10. One step above the section layer comes the factory
layer. The factory layer is
composed by a group of 3 to 8 sections, depending
on the factory’s primary functionality
In broad terms, it performs tasks that are logically
similar in concept with the section layer. One of
the factory’s sections is selected at random to serve
as a main section in the factory’s scope. This
particular section is equipped with an extra
workstation, whichis responsible for the overall
supervision of the manufacturing process in the
whole
factory andis called factory supervisory workstation.
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11. By realizing my papers we can easily
understand that our life changes to an
electric
life that is continued by computers. .
Next picture may clearly show you that
what I want to say .
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