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• Journal article
  Bauer M, Cox JW, Caveness MH, Downs JJ, Thornhill NFet al., 2007,

  Nearest neighbors methods for root cause analysis of plantwide disturbances

  , INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, Vol: 46, Pages: 5977-5984, ISSN: 0888-5885
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  • Citations: 27
• Journal article
  Choudhury MAAS, Kariwala V, Thornhill NF, Douke H, Shah SL, Takada H, Forbes JFet al., 2007,

  Detection and diagnosis of plant-wide oscillations

  , CANADIAN JOURNAL OF CHEMICAL ENGINEERING, Vol: 85, Pages: 208-219, ISSN: 0008-4034
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  • Citations: 18
• Journal article
  Bauer M, Cox JW, Caveness MH, Downs JJ, Thornhill NFet al., 2007,

  Finding the direction of disturbance propagation in a chemical process using transfer entropy

  , IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY, Vol: 15, Pages: 12-21, ISSN: 1063-6536
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  • Citations: 187
• Journal article
  Thornhill NF, Horch A, 2007,

  Advances and new directions in plant-wide disturbance detection and diagnosis

  , Control Engineering Practice, Vol: 15, Pages: 1196-1206, ISSN: 1873-6939

  This article reviews advances in detection and diagnosis of plant-wide control system disturbances in chemical processes and discusses new directions that look promising for the future. Causes of plant-wide disturbances include non-linear limit cycles in control loops, controller interactions and tuning problems. The diagnosis of non-linearity, especially when due to valve stiction, has been an active area. Detection of controller interactions and disturbances due to plant structure remain open issues, however, and will need new approaches. For the future, the linkage of data-driven analysis with a qualitative model of the process is an exciting prospect. Finally, the paper offers some brief comments about emerging applications.

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• Journal article
  Yim SY, Ananthakumar HG, Benabbas L, Horch A, Drath R, Thornhill NFet al., 2006,

  Using process topology in plant-wide control loop performance assessment

  , COMPUT CHEM ENG, Vol: 31, Pages: 86-99, ISSN: 0098-1354

  This contribution describes how disturbances in a control system can be isolated and diagnosed automatically based on plant topology. In order to demonstrate this, a prototype software has been designed and implemented which, when given an electronic process schematic of a plant and results from a data-driven analysis, allows the user to pose queries about the plant and to find root causes of plant-wide disturbances. This hybrid system puts together two new technologies: the plant topology information written in XML according to the computer aided engineering exchange (CAEX) schema and the results of a signal analysis tool called plant-wide disturbance analysis (PDA). The isolation and diagnosis of the root causes of plant-wide disturbances is enhanced when process connectivity is considered alongside the results of data-driven analysis. (c) 2006 Elsevier Ltd. All rights reserved.

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• Journal article
  Choudhury MAAS, Shah SL, Thornhill NF, Shook DSet al., 2006,

  Automatic detection and quantification of stiction in control valves

  , CONTROL ENGINEERING PRACTICE, Vol: 14, Pages: 1395-1412, ISSN: 0967-0661
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  • Citations: 106
• Journal article
  Thornhill NF, Melbo H, Wiik J, 2006,

  Multidimensional visualization and clustering of historical process data

  , INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, Vol: 45, Pages: 5971-5985, ISSN: 0888-5885
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  • Citations: 18
• Journal article
  Thornhill NF, Naim MM, 2006,

  An exploratory study to identify rogue seasonality in a steel company's supply network using spectral principal component analysis

  , EUROPEAN JOURNAL OF OPERATIONAL RESEARCH, Vol: 172, Pages: 146-162, ISSN: 0377-2217
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  • Citations: 14
• Journal article
  Huang B, Ding SX, Thornhill NF, 2006,

  Alternative solutions to multi-variate control performance assessment problems

  , JOURNAL OF PROCESS CONTROL, Vol: 16, Pages: 457-471, ISSN: 0959-1524
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• Journal article
  Pagliarani A, Kenyon AJ, Thornhill NF, Sirisena E, Lee K, Law VJet al., 2006,

  Process harmonic pulling in RIE plasma-tool

  , ELECTRONICS LETTERS, Vol: 42, Pages: 120-121, ISSN: 0013-5194
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  • Citations: 4
• Conference paper
  Yim SY, Ananthakumar HG, Benabbas L, Horch A, Drath R, Thornhill NFet al., 2006,

  Using the Process Schematic in Plant-wide Disturbance Analysis

  , Joint Conference Event of the 9th Symposium on Process Systems Engineering (PSE 2006)/16th European Symposium on Computer Aided Process Engineering (ESCAPE-16), Publisher: ELSEVIER SCIENCE BV, Pages: 1431-1436, ISSN: 1570-7946
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  • Citations: 3
• Journal article
  Xia CM, Howell J, Thornhill NF, 2005,

  Detecting and isolating multiple plant-wide oscillations via spectral independent component analysis

  , AUTOMATICA, Vol: 41, Pages: 2067-2075, ISSN: 0005-1098
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  • Citations: 44
• Journal article
  Tangirala AK, Shah SL, Thornhill NF, 2005,

  PSCMAP: A new tool for plant-wide oscillation detection

  , JOURNAL OF PROCESS CONTROL, Vol: 15, Pages: 931-941, ISSN: 0959-1524
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  • Citations: 35
• Journal article
  Wang M, Thornhill NF, Huang B, 2005,

  Closed-loop identification with a quantizer

  , JOURNAL OF PROCESS CONTROL, Vol: 15, Pages: 729-740, ISSN: 0959-1524
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  • Citations: 7
• Journal article
  Thornhill NF, Shah SL, 2005,

  New directions in control loop assessment and diagnosis

  , COMPUTING AND CONTROL ENGINEERING, Vol: 16, Pages: 18-22, ISSN: 0956-3385
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• Journal article
  Huang B, Ding SX, Thornhill NF, 2005,

  Practical solutions to multivariate feedback control performance assessment problem: reduced a priori knowledge of interactor matrices

  , JOURNAL OF PROCESS CONTROL, Vol: 15, Pages: 573-583, ISSN: 0959-1524
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• Journal article
  Horch A, Hegre V, Hilmen K, Melbø H, Benabbas L, Pistikopoulos S, Thornhill N, Bonavita Net al., 2005,

  Root cause

  , ABB Review, Pages: 44-48, ISSN: 1013-3119

  An international team from ABB and the Imperial College London/University College London's Centre for process Systems Engineering has initiated a project to reduce the time spent on troubleshooting in processing plants. The project aims at automatically detecting plant-wide disturbances and determining the root causes of disturbances and oscillations in production processes. Researchers at the University have developed methods for computer-aided plant disturbance analysis. The main aim of the researchers is to develop a software application that identifies unwanted plant behavior and its root causes so that operational and maintenance efforts are directed efficiently.

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  • Citations: 4
• Conference paper
  Thornhill NF, Bauer M, Meaburn A, 2005,

  Cause and effect analysis of chemical processes

  , IEE Seminar on Control Loop Assessment and Diagnosis, Publisher: IET, Pages: 23-30, ISSN: 0537-9989

  In continuous chemical processes, disturbances in the process conditions can propagate widely and cause secondary upsets in remote locations. The aim of this paper is to apply some recent data-driven methods for detection and diagnosis of process disturbances using historical process data that have been proving successful in a range of applications. An industrial case study is presented in which a plant-wide control system disturbance caused by the presence of a recycle was successfully located and then verified by further plant testing. © The IEE.

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• Journal article
  Choudhury MAAS, Thornhill NF, Shah SL, 2005,

  Modelling valve stiction

  , CONTROL ENGINEERING PRACTICE, Vol: 13, Pages: 641-658, ISSN: 0967-0661
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  • Citations: 201
• Journal article
  Thornhill NF, 2005,

  Finding the source of nonlinearity in a process with plant-wide oscillation

  , IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY, Vol: 13, Pages: 434-443, ISSN: 1063-6536
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  • Citations: 68

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