DETECTION AND ISOLATION OF LEAKAGE AND VALVE FAULTS IN HYDRAULIC SYSTEMS IN VARYING LOADING CONDITIONS, PART 2: FAULT DETECTION AND ISOLATION SCHEME

Authors

  • Jarmo Nurmi Tampere University of Technology, Department of Intelligent Hydraulics and Automation P.O. Box 589, 33101 Tampere, Finland
  • Jouni Mattila Tampere University of Technology, Department of Intelligent Hydraulics and Automation P.O. Box 589, 33101 Tampere, Finland

Keywords:

fault detection and isolation, leakages, valve faults, varying load, unscented kalman filter, fault patterns

Abstract

Leakages and valve faults are among the most common faults in hydraulic systems. This paper studies the real-time detection and isolation of certain leakage and valve faults based on the results obtained in part one. In the first part, the mathematical model of a hydraulic test bed was analysed with Global Sensitivity Analysis to facilitate a systematic and verified approach to model-based condition monitoring. In this paper, an Unscented Kalman Filter-based Fault Detection and Isolation scheme for leakage and valve faults of a generic servo valve-controlled hydraulic cylinder is devised. Compared to existing literature, the leakage and valve faults are decoupled from cylinder static and dynamic loading which makes the results generic and applicable to any servo valve-controlled hydraulic cylinder. Moreover, a more comprehensive set of fault patterns for the detection and isolation of leakages and valve faults with experimental and simulation results are presented. We show that detecting an external leakage of as small as 0.17 l/min is possible in some cases, but the accuracy of the method varies considerably. We also report why the isolation of valve faults from leakages is very difficult.

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Author Biographies

Jarmo Nurmi, Tampere University of Technology, Department of Intelligent Hydraulics and Automation P.O. Box 589, 33101 Tampere, Finland

Jarmo Nurmi Jarmo Nurmi graduated with a B.Sc. and M.Sc. in hydraulic engineering in 2009 and 2011, respectively, at the Tampere University of Technology (TUT). He is currently working as a researcher at TUT in the department of Intelligent Hydraulics and Automation (IHA). His research interests are mobile hydraulics and condition monitoring.

Jouni Mattila, Tampere University of Technology, Department of Intelligent Hydraulics and Automation P.O. Box 589, 33101 Tampere, Finland

Jouni Mattila Professor, Dr. Tech. Jouni Mattila received M.Sc. (Eng.) in 1995 and Dr. Tech 2000 both from TUT. He is a TUT program manager in ITER Remote Handling robotics maintenance projects. He is a coordinator of Marie Curie Initial training Network program: PURESAFE with 15 PhD-students across the EU. His research interests include machine automation and preventive maintenance, and fault-tolerant control system development for advanced machines utilizing lean systems engineering framework.

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Published

2012-03-01

How to Cite

Nurmi, J., & Mattila, J. (2012). DETECTION AND ISOLATION OF LEAKAGE AND VALVE FAULTS IN HYDRAULIC SYSTEMS IN VARYING LOADING CONDITIONS, PART 2: FAULT DETECTION AND ISOLATION SCHEME. International Journal of Fluid Power, 13(1), 17–27. Retrieved from https://journals.riverpublishers.com/index.php/IJFP/article/view/694

Issue

2012: Vol 13 Iss 1

Section

Original Article