|
PLEASE NOTE: The Publications System provided by the Manufacturing Systems Integration Division (MSID) has moved to: http://www.mel.nist.gov/msidlibrary/publications.html. The pages below are maintained for archival purposes only.
Publication summary
Author(s): Frank Riddick
Publication date: May 1998
Citation: Frank Riddick: "Using Simulation as a Proxy for a Real Shop Floor and Data Collection System," NISTIR 6173, National Institute of Standards and Technology, Gaithersburg, MD, 1998.
Key words: Discrete event simulation, shop floor scheduling, reactive scheduling
Availability:
Abstract:
-
Increasing shop floor efficiency has always been a major concern of
manufacturing companies. Scheduling applications have been successfully
employed to create optimized plans which manufacturers can use to run their
operations. But it is a common occurrence in today's dynamic manufacturing
environment that the information upon which a schedule is based often
changes after the schedule has been created. Running shop floor operations
based this out of date information can lead to increased shop floor
inefficiency. Systems need to be developed which not only provide good
initial schedules, but also can react to changes in the state of operations
of the shop floor by producing and executing updated schedules.
Research is underway at the National Institute of Standards and
Technology(NIST) to develop standards and procedures which facilitate the
development of reactive scheduling systems. A reactive scheduling system
is one that not only produces initial schedules for production, but also:
1)monitors the shop floor events and evaluates compliance to the schedule
and other shop floor performance related criteria; 2)collects shop floor
status information to enable the creation of updated schedules based on
current information; and 3)produces new schedules based on the collected
information and incorporates the new schedule information into the current
shop floor operations. A key area of research in developing this approach
is the use of a discrete event simulation system as proxy for a real shop
floor and shop floor data collection system.
A prototype is being developed at NIST which uses simulation as proxy for a
real shop floor and shop floor data collection system. The use of
simulation enhances the ability to do this research by: 1)greatly reducing
the cost because a real shop floor is not required; and 1)greatly
increasing the number of shop floor configurations that can be examined.
In this paper the changes that were made to the simulation system to
incorporate it into the reactive scheduling system prototype will be
discussed.
Attention users of these documents: The information contained
in these files should not be altered in any way. Attempts to change
these files will adversely impact the integrity of the information and
its usefulness. It is intended for use as is and will lose its
usefulness if changed.
 Send questions or comments to Webmaster.
|
