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CONTENTS 4.4 Modeling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 4.5 Entropy Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 4.6 MBD on the Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 5 Diagnosing the Beam Propeller Movement of the Frontal Stand 49 5.1 Experimental Methodology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 5.2 Scope of the Target System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 5.3 Off-line Inference by Experts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 5.4 MBD Implementation 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 5.5 MBD Implementation 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 5.6 MBD Implementation 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 5.7 Results of the Case Study . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 6 Conclusions and Recommendations 69 6.1 Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 6.2 Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 Bibliography 73 A Glossary of terms 77 B Case Study Details 85 B.1 Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 B.2 System Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 B.3 Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 B.4 Full List of Examined Fault Scenarios . . . . . . . . . . . . . . . . . . . . . . . . 87 B.5 Discretization of Implementation MBD-2 . . . . . . . . . . . . . . . . . . . . . . 89 C Lydia Models 91 C.1 The Synthetic Models that are Used in this Thesis . . . . . . . . . . . . . . . . . . 91 C.2 Model of the Power Supply Example . . . . . . . . . . . . . . . . . . . . . . . . . 94 C.3 The Models Constructed for the Case Study . . . . . . . . . . . . . . . . . . . . . 100 D State-of-the-Future Fault Diagnosis at PMS 117 vi
List of Figures 1.1 The role of fault diagnosis in a dependable operation. . . . . . . . . . . . . . . . . . . 2 1.2 Model-Based Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.1 Philips Cardio-Vascular X-Ray System . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.2 Partial architecture of the power supply. . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.3 The current procedure for doing fault diagnosis (and repair). . . . . . . . . . . . . . . 13 3.1 Categorization of fault diagnosis approaches . . . . . . . . . . . . . . . . . . . . . . 24 3.2 Power Supply - Black Box view. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 3.3 Partial architecture of the power supply (repetition of Figure 2.2). . . . . . . . . . . . 27 4.1 3-inverter example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 4.2 4-inverter example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 5.1 Jobsheet referring to problems with the beam propeller movement. . . . . . . . . . . . 51 5.2 Beam Propeller Movement of the frontal stand . . . . . . . . . . . . . . . . . . . . . . 52 5.3 Partial architecture of the FRUs that implement the beam propeller movement. Signals enclosed by brackets are not observable, the others are. . . . . . . . . . . . . . . . . . 58 5.4 Modeling the control loops . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 5.5 Modeling the error signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 B.1 The parts of the frontal stand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 B.2 Forces and torques on the frontal stand. . . . . . . . . . . . . . . . . . . . . . . . . . 87 D.1 Proposed procedure for doing fault diagnosis (and repair) at PMS. . . . . . . . . . . . 118 vii
Page 1: Automated Fault Diagnosis at Philip
Page 4 and 5: © 2006 W.M. Lindhoud. Document gen
Page 7: Preface The work presented in this
Page 13: List of Tables 3.1 Evaluation appro
Page 16 and 17: 1.1 Fault Diagnosis Introduction Fi
Page 18 and 19: 1.2 Automated Fault Diagnosis Intro
Page 20 and 21: 1.5 Outline of the Thesis Introduct
Page 23 and 24: Chapter 2 State-of-the-Practice Fau
Page 25 and 26: State-of-the-Practice Fault diagnos
Page 33 and 34: Chapter 3 Automated Fault Diagnosis
Page 35 and 36: Automated Fault Diagnosis 3.1 Overv
Page 41 and 42: Automated Fault Diagnosis 3.3 Off-l
Page 43 and 44: Automated Fault Diagnosis 3.5 Model
Page 45: Automated Fault Diagnosis 3.6 Evalu
Page 48 and 49: 4.1 Fundamentals Model-Based Fault
Page 50 and 51: 4.2 Model-Based Diagnosis with LYDI
Page 52 and 53: 4.3 Basic Assumptions Model-Based F
Page 54 and 55: 4.4 Modeling Model-Based Fault Diag
Page 56 and 57: 4.4 Modeling Model-Based Fault Diag
Page 58 and 59: 4.5 Entropy Gain Model-Based Fault
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4.6 MBD on the Power Supply Model-B
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Chapter 5 Diagnosing the Beam Prope
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Diagnosing the Beam Propeller Movem
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Chapter 6 Conclusions and Recommend
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Conclusions and Recommendations 6.2
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BIBLIOGRAPHY [12] Johan de Kleer an
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Appendix A Glossary of terms In thi
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Glossary of terms • Diagnostic Pe
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Glossary of terms • Model: an abs
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Glossary of terms • System: an en
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B.2 System Data Case Study Details
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B.4 Full List of Examined Fault Sce
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B.5 Discretization of Implementatio
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C.1 The Synthetic Models that are U
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C.2 Model of the Power Supply Examp
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C.3 The Models Constructed for the
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Appendix D State-of-the-Future Faul
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