Abstract/Details

Continuous optimal infeed control for cylindrical plunge grinding


2004 2004

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Abstract (summary)

A new methodology is developed for optimal infeed control of cylindrical plunge grinding cycles. Unlike conventional cycles having a few sequential stages with discrete infeed rates, the new methodology allows for continuous variation of the infeed rate to further reduce the cycle time. Distinctive characteristics of optimal grinding cycles with variable infeed rates were first investigated by applying dynamic programming to a simulation of the grinding cycle. The simulated optimal cycles were found to consist of distinct segments with predominant constraints. This provided the basis for an optimal control policy whereby the infeed rate is determined according to the active constraint at each segment of the cycle. Accordingly, the controller is designed to identify the state of the cycle at each sampling instant from on-line measurements of power and size, and compute the infeed rate according to the optimal policy associated with that state. The control system to implement the optimization policy is proposed together with provisions to enhance robustness to modeling uncertainty and measurement noise. Robustness provisions include model adaptation by parameter estimation from on-line measurements of size and power, and incorporation of safety margins in the optimization process. Problems associated with practical implementation of the control system, stemming from power limitations and wheel wear, are also discussed. The controller performance is demonstrated on an instrumented internal cylindrical grinding machine.

Indexing (details)


Subject
Mechanical engineering
Classification
0548: Mechanical engineering
Identifier / keyword
Applied sciences, CNC, Cycle times, Cylindrical plunge grinding, Grinding, Infeed control
Title
Continuous optimal infeed control for cylindrical plunge grinding
Author
Dong, Shaoqiang
Number of pages
67
Publication year
2004
Degree date
2004
School code
0118
Source
DAI-B 65/11, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780496132201, 0496132202
Advisor
Danai, Kourosh
University/institution
University of Massachusetts Amherst
University location
United States -- Massachusetts
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3152687
ProQuest document ID
305177215
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/305177215
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