Main Data
Author: Ali Ahammad Shoukat Choudhury, Sirish L. Shah, Nina F. Thornhill
Title: Diagnosis of Process Nonlinearities and Valve Stiction Data Driven Approaches
Publisher: Springer-Verlag
ISBN/ISSN: 9783540792246
Edition: 1
Price: CHF 184,80
Publication date: 01/01/2008
Category: Wirtschaft/Management
Language: English
Technical Data
Pages: 286
Kopierschutz: DRM
Geräte: PC/MAC/eReader/Tablet
Formate: PDF
Table of contents
were published in the series as the contributed volume, Process Control Performance Assessment: From Theory to Implementation with Andrzej Ordys, Damian Uduehi, and Michael Johnson as Editors (ISBN 978-1-84628-623-0, 2007). Along with this good progress in process controller assessment methods, researchers have also been investigating techniques to diagnose what is causing the process or control loop degradation. This requires the use of on-line data to identify faults via new diagnostic indicators of typical process problems. A significant focus of some of this research has been the issue of valve problems; a research direction that has been motivated by some industrial statistics that show up to 40% of control loops having performance degradation attributable to valve problems. Shoukat Choudhury, Sirish Shah, and Nina Thornhill have been very active in this research field for a number of years and have written a coherent and consistent presentation of their many research results as this monograph, Diagnosis of Process Nonlinearities and Valve Stiction. The Advances in Industrial Control series is pleased to welcome this new and substantial contribution to the process diagnostic literature. The reader will find the exploitation of the extensive process data archives created by today's process computer systems one theme in the monograph. From another viewpoint, the use of higher-order statistics could be considered to provide a continuing link to the earlier methods of the statistical process control paradigm.

M. A. A. Shoukat Choudhury received his B. Sc. Engineering (Chemical) from Bangladesh University of Engineering and Technology (BUET), Dhaka, Bangladesh in 1996. He was awarded a gold medal for his outstanding results in B. Sc. Engineering. He obtained an M. Sc. Engineering (Chemical) in 1998 from the same university. He has completed his PhD degree in process control (Chemical Engineering) at the University of Alberta, Canada. For his outstanding research performance during the course of PhD program he has been awarded several awards such as University of Alberta PhD Dissertation Fellowship, Andrew Stewart Memorial Prize and ISA Educational Foundation Scholarship. He is the principal inventor of an internation patent (applied, 2005) on 'Methods for Detection and Quantification of Control Valve Stiction'. The methodologies and algorithms described in this patent are implemented and available in the commercial software ProcessDoctor from Matrikon Inc. His main research interests include diagnosis of poor control performance, stiction in control valves, data compression, control loop performance assessment and monitoring, and diagnosis of plant wide oscillations.

Sirish Shah received his B.Sc. degree in control engineering from Leeds University in 1971, a M.Sc. degree in automatic control from UMIST, Manchester in 1972, and a Ph.D. degree in process control (chemical engineering) from the University of Alberta in 1976. During 1977 he worked as a computer applications engineer at Esso Chemicals in Sarnia, Ontario. Since 1978 he has been with the University of Alberta, where currently holds the NSERC-Matrikon-ASRA Senior Industrial Research Chair in Computer Process Control. In 1989, he was the recipient of the Albright & Wilson Americas Award of the Canadian Society for Chemical Engineering in recognition of distinguished contributions to chemical engineering. He has held visiting appointments at Oxford University and Balliol College as a SERC fellow in 1985-86 and at Kumamoto University, Japan as a senior research fellow of the Japan Society for the Promotion of Science (JSPS) in 1994. The main area of his current research is process and performance monitoring, system identification and design and implementation of softsensors. He has recently co-authored a book titled, Performance Assessment of Control Loops: Theory and Applications. He has held consulting appointments with a wide variety of process Industries and has also taught many industrial courses.

Table of contents
Author Biographies11
1.1 Concepts in Data-Driven Analysis of Chemical Processes22
1.1.1 Linear and Nonlinear Time Series23
1.1.2 Statistics and Randomness23
1.1.3 Frequency Content and Spectral Methods26
1.2 Nonlinearity in Control Valves28
1.3 The Layout of the Book30
1.3.1 Part I Higher-Order Statistics30
1.3.2 Part II Data Quality  Compression and Quantization30
1.3.3 Part III Nonlinearity and Control Performance31
1.3.4 Part IV Control Valve Stiction  Definition, Modelling, Detection and Quantification32
1.3.5 Part V Plant-wide Oscillations  Detection and Diagnosis33
1.3.6 References34
1.4 Summary34
Part I36
Higher-Order Statistics: Preliminaries37
2.1 Introduction37
2.2 Time Domain Analysis38
2.2.1 Moments38
2.2.2 Cumulants40
2.2.3 The Relationship Between Moments and Cumulants42
2.2.4 Properties of Moments and Cumulants42
2.2.5 Moments and Cumulants of Stationary Signals45
2.3 Spectral Analysis45
2.3.1 Power Spectrum,46
2.3.2 Bispectrum,47
2.4 Summary48
Bispectrum and Bicoherence49
3.1 Bispectrum49
3.1.1 Estimation of the Bispectrum50
3.1.2 Properties of Estimators and Asymptotic Behaviour52
3.1.3 Bicoherence or Normalized Bispectrum54
3.1.4 Properties of Bispectrum and Bicoherence55
3.2 Bispectrum or Bicoherence Estimation Issues57
3.2.1 Choice of Window Function58
3.2.2 Choice of Data Length, Segment Length and Fourier Transform Length60
3.3 Summary61
Part II63
Impact of Data Compression and Quantization on Data- Driven Process Analyses65
4.1 Introduction65
4.2 Data Compression Methods67
4.2.1 Overview of