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Structures Health Monitoring (SHM)

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♥ framework of National Project „Intelligent
   system for simultaneous control and
   monitoring of structures", PNCDI2 II
  Partnerships, Project 81 031 SIMOCA,
   2007-2010

hardware system (Figs. 1-3)

• 200x500x1.25 mm cantilevered aluminum plate
   on which the strain gauges (SGD-5/350-LY11,
  Omega Engineering) and MFC actuators
  (M8557P1MFC, Smart Materials) are bonded
 
signal conditioners (OM5-WBS-3-C, Omega
  Engineering) are converting strain gauges bridge
  signals to high level and for bridge supply
 
TREK high voltage amplifiers (PA05039,
  —500V÷+1500V) for the MFC actuators supply
 
• PC with implemented control laws in   LabView:
   robust LQG/LTR or robust H control
 
Data Acquisition Card (NI PCIe-6259) used for
  applying to the MFC actuator the control signal,
  amplified by the high voltage amplifiers
 
• the first four natural frequencies (Hz): 5, 26, 31,
  157, pseudo-identification by impulse excitation
 
• the “chirp” type monitoring signal and disturbance   
   signal are generated by a functions generator 
   (Velleman or LabView), as input signals to the   
   MFCs   

Structure_1

FIG. 1 – DEMONSTRATOR OF INTELLIGENT STRATEGY FOR MONITORING AND ACTIVE CONTROL

fig2

FIG. 2 – PHILOSOPHY OF SIMULTANEOUSLY ACTIVE CONTROL AND HEALTH MONITORING

Details in: Ursu, I., G. Tecuceanu, A. Toader, V. Berar (2010), Simultaneous active vibration control and health monitoring of structures. Experimental results, INCAS Bulletin, 2, 2, 114-127

fig3

FIG. 3 – ELECTRIC CIRCUIT FOR LOW COST MONITORING

 

tentative conclusions
 
  • the control (its presence or 
  absence) doesn’t significantly
  influence the impedance 
  signature, the only important
  and positive effect being that
  of increasing the operation 
  time of the structure
 
• illustration of active LQG
  control efficiency: Piezo MFC1
  is used in the triple role of 
  disturbance insertion, insertion
  control insertion and sensor for
  measuring strain, simplified via
  a bridge circuit

• control efficiency:
  about 8 dB attenuation
fig10

fig4

FIG. 4 – a) ACTIVE CONTROL EFFICIENCY; b) SOME OF RESEARCH TEAM MEMBERS


Last Updated on Wednesday, 06 June 2012 12:25  

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