Comparative Vacuum Monitoring CVMTM
**** Hidden Message ***** Comparative Vacuum MonitoringCVMTM
Andrew Chilcott
Structural Monitoring Systems Ltd
Perth, Australia
Tel: +61 8 9204 4844, Fax: +61 8 9204 4866
a.chilcott@smsystems.com.au
www.smsystems.com.au
Outline
• What is CVMTM? / How does it work?
• Development background / early applications
• Application to Automotive industry
What is CVMTM ?
Vacuum
source
Flow meter or
Pressure switch
Sensor
How does it work?
Operating Modes
CVM
Continuous Periodic
Monitor Switch
More efficient Testing More efficient NDI
•Complex networks
•Real time monitoring •Automatic control •Less strip / rebuild
Development
• 1994 inventor, Ken Davey files CVM patent
• 2002 First installation on operating aircraft for US Navy (H53).
• 2004 CVM™adopted by Airbus for A380 full scale fatigue testing
• 2005 CVM™ trials – ADF Black Hawk; RN Sea King; RAF Nimrod, RAF
Harrier II.
• 2005 Airbus In-flight CVM™Joint Development Agreement
• 2005 License agreement with Boeing for CVM™use on commercial aircraft
• 2005 Pilot trial with PBR automotive brake manufacturer
• 2006 Completion of Boeing SPM program / Completion of DSTO trials –
(Australian military Director General )
• 2006 Development of low cost CV Switch for fatigue test automation
Military Aircraft
Airbus JDA
Boeing NDT SPM
•2006: CVM included in Standard Practice Manual
•2007: CVM as AMOC for several SB 737inspections
CV Switch
•Quality control testing
•Developmental testing
•Small Crack detected in real time
•Appropriate action automated
- test stopped
- alarm (light/sound) triggered
- signal sent
Quicker, More Accurate, Less labor intensive testing
2 inches
Silicone Sensor
Light / Pliable / Self-adhesive / Inexpensive
1 cm 1 cm
CV Switch
no crack
Test Piece
Fatigue, torsion, vibration,
etc
Silicone sensor
(self adhesive)
Tubing (PTFE)
Vacuum
Terminals
- Stop test
- Or alarm
- Or send signal
Pressure Switch
Sensor gallery
Side View
•No crack breaching vacuum
in sensor gallery
•Switch contact remains
open
Structural Monitoring Systems Proprietary
CV Switch
crack detected
Tubing (PTFE)
Vacuum
Pressure Switch
Crack
Plan View
•Surface Crack breaches
sensor gallery
•Switch contacts close
•Test stopped / alarm signal /
remote signal sent……
Structural Monitoring Systems Proprietary
Test Lab Setup
DIN mounted CV Switches
Pulsing Rig
Test Set-up
Test Lab Setup
•Shorter design / verify cycles
•Less labor intensive
•More accurate crack initiation detection
•Cycle count when crack is < 1mm
CVM benefits
• Shorter design / verify cycle
• More accurate crack detection
- cycle count at <1mm crack
• Less labor required
• Better testing facility utilisation henh vbsdiabp9hv['
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