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FAULT DETECTION AND
  FAULT DIAGNOSIS OF
PNEUMATIC ACTUATORS:A
 CASE STUDY REPORT ON
         PMFD
            Submitted by:
            Anand Kumar 11RE60R04


            Vikram Singh 11EE64R03
CONTENTS

1. Introduction
2. Faults of Pneumatic valves
3. Results
4. Conclusions
5. References
1   INTRODUCTION




    Pneumatic actuator for linear motion with power supply: a) schematic; b) energy flow
    scheme; c) two-port representation. 1: AC motor, 2: air compressor, 3: pressure-relief valve, 4:
    air filter with water trap, 5: air storage (accumulator), 6: 4/3 proportional valve, electrical
    solenoid actuation, spring return, 7: double-rod cylinder; 8: diaphragm drive with spring return
CONTD..
Pneumatic actuators consist of an airflow valve and an actuating
device transforms the pneumatic energy into mechanical energy.

The valve is connected to the pneumatic pressure line manipulates
the pressurized air flow to the actuating device.

The valves are either proportional-acting valves or switching
valves.

Proportional acting valves allow a continuous manipulation of the
airflow either electrically by two solenoids or pneumatically with
one air flow modulator and return spring.

Switching valves are electromagnetic devices and operate with
PWM at high frequencies to generate actuator position.
2   FAULTS OF PNEUMATIC VALVES

    Faults of pneumatic valves may arise in the
     air supply
     air supply line
     piston or diaphragm actuators
     valve stem sealing and
     plug–seat combination




     Cross-sectional view of a
     pneumatic valve with an
     electro-pneumatic position
     controller
Typical faults of pneumatic flow valves and fault-detection
coverage in dependence on instrumentation- x:yes, 0: no
2.1   MODELS OF PNEUMATIC VALVES




      The parameters for the chamber pressure are time-variant and depend
      on the motion and the position of the diaphragm.
The dynamics of the mechanical part of the valve, the diaphragm, the
  valve stem and the plug are governed by the balance of forces:




where mv :mass of the stem and connected parts,
      cs : spring constant,
      dv ,fc :coefficients of the viscous and dry friction of the
             stuffing box and guidance
      Fext: external forces, mainly the force through the flowing
            fluid
RESULTS
 Sensor
 Fault on
 intake
 air flow

Sensor
Fault on
Manifold
pressure

Fault in
Manifold
Due to air
leak
CONCLUSIONS
 • The fault detection strategy is designed for
   three
important faults as from manufacturer point of
view.

 • Observed that after initial transient effect the
performance of each residual is effective.
REFERENCES
 1. J. A. F. Vinsonneaut, D. N. Shieldst, K. J. Bumhamt. Improved SI
engine modeling techniques with application to fault detection .
Pages 719-724, Proceedings of 2002 IEEE international Conference
on Control Applications, September 18-20.2002 Glasgow, U.K.

 1. R. Iserman. Fault Diagnosis Systems An introduction from fault
detection to fault tolerance, Chapter 11 Fault detection with state
observers and state estimation, Springer, Berlin.

 1. Graham C. Goodwin, Stefan F. Graebe, Mario E. Salgado,
Control system design, Chapter V Advanced SISO control,
Prentice Hall, New Jersey 1990.

 1. K.P. Mohandas. Modern control engineering, Sanguine
    Technical
Publishers. Bengaluru. 2006.

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FAULT DETECTION AND FAULT DIAGNOSIS

  • 1. FAULT DETECTION AND FAULT DIAGNOSIS OF PNEUMATIC ACTUATORS:A CASE STUDY REPORT ON PMFD Submitted by: Anand Kumar 11RE60R04 Vikram Singh 11EE64R03
  • 2. CONTENTS 1. Introduction 2. Faults of Pneumatic valves 3. Results 4. Conclusions 5. References
  • 3. 1 INTRODUCTION Pneumatic actuator for linear motion with power supply: a) schematic; b) energy flow scheme; c) two-port representation. 1: AC motor, 2: air compressor, 3: pressure-relief valve, 4: air filter with water trap, 5: air storage (accumulator), 6: 4/3 proportional valve, electrical solenoid actuation, spring return, 7: double-rod cylinder; 8: diaphragm drive with spring return
  • 4. CONTD.. Pneumatic actuators consist of an airflow valve and an actuating device transforms the pneumatic energy into mechanical energy. The valve is connected to the pneumatic pressure line manipulates the pressurized air flow to the actuating device. The valves are either proportional-acting valves or switching valves. Proportional acting valves allow a continuous manipulation of the airflow either electrically by two solenoids or pneumatically with one air flow modulator and return spring. Switching valves are electromagnetic devices and operate with PWM at high frequencies to generate actuator position.
  • 5. 2 FAULTS OF PNEUMATIC VALVES Faults of pneumatic valves may arise in the  air supply  air supply line  piston or diaphragm actuators  valve stem sealing and  plug–seat combination Cross-sectional view of a pneumatic valve with an electro-pneumatic position controller
  • 6. Typical faults of pneumatic flow valves and fault-detection coverage in dependence on instrumentation- x:yes, 0: no
  • 7. 2.1 MODELS OF PNEUMATIC VALVES The parameters for the chamber pressure are time-variant and depend on the motion and the position of the diaphragm.
  • 8. The dynamics of the mechanical part of the valve, the diaphragm, the valve stem and the plug are governed by the balance of forces: where mv :mass of the stem and connected parts, cs : spring constant, dv ,fc :coefficients of the viscous and dry friction of the stuffing box and guidance Fext: external forces, mainly the force through the flowing fluid
  • 9. RESULTS Sensor Fault on intake air flow Sensor Fault on Manifold pressure Fault in Manifold Due to air leak
  • 10. CONCLUSIONS • The fault detection strategy is designed for three important faults as from manufacturer point of view. • Observed that after initial transient effect the performance of each residual is effective.
  • 11. REFERENCES 1. J. A. F. Vinsonneaut, D. N. Shieldst, K. J. Bumhamt. Improved SI engine modeling techniques with application to fault detection . Pages 719-724, Proceedings of 2002 IEEE international Conference on Control Applications, September 18-20.2002 Glasgow, U.K. 1. R. Iserman. Fault Diagnosis Systems An introduction from fault detection to fault tolerance, Chapter 11 Fault detection with state observers and state estimation, Springer, Berlin. 1. Graham C. Goodwin, Stefan F. Graebe, Mario E. Salgado, Control system design, Chapter V Advanced SISO control, Prentice Hall, New Jersey 1990. 1. K.P. Mohandas. Modern control engineering, Sanguine Technical Publishers. Bengaluru. 2006.

Notes de l'éditeur

  1. PAGE 224 WOLOWICH