Home Mechatronic Systems

Active vibration control of flexible structures

E-mail Print

 

♥ case of basic specimen - smart plate

• 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 gages bridge
  signals to high level and for bridge supply
TREK high voltage amplifiers (PA05039,
  —500 V÷ +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
  processing the signals from conditioners and 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

case of an Eppler 211 airfoil

• semi-span – 650 mm, chord – 200 mm
• wing skin: composite material E-glass
  texture/orto- ophatlic resin, 4 layers and
  0.14 mm thicknes each
wing spars placed at 30%, respectively, 65% of
  chord, made of the same material
• the skin and the spars are ANSYS modeled as shell
  99-2D–element
• wing equivalent E = 9.28X109 N/mp
• the first three natural frequencies (Hz) and 
  modes:
  21 (bending), 108 (yaw), 128 (bending), pseudo-
  identification by impulse excitation
• two pairs of collocated MFC- 8557 S1, a pair for
  excitation and a pair for control; thermal analogy is
  used for modeling
TREK high voltage amplifiers (PA05039,
  –500 V÷+1500V) for the MFC actuators supply
accelerometer B&K
• a PC with implemented control laws in LabView:
   robust LQG/LTR or robust control
 

case of 2DOF system with active control

• the rigidity is simulated by a pair of identical
  cantilevered plates, which supports the so-called
  S-shape plates deformation, thus ensuring a plane-
  parallel movement of the masses (and a very good
  guide, implicitly)
• excitation actuator — VTS 75M Modal Test System
• excitation actuator — electrohydraulic servo
active_vibration_1
SMART PLATE
 
active_vibration_2
PIEZO SMART WING MODEL
 
active_vibration_3
2 DOF SYSTEM WITH ACTIVE CONTROL

 

SMART PLATE   
active vibration control:

 

robust LQG/LTR control synthesis
active_vibration_4
robust H control synthesis
active_vibration_5

 


Last Updated on Wednesday, 06 June 2012 12:16  

Who's Online

We have 557 guests online

Links

Featured Links:
http://www.edu.ro :: Ministerul Educatiei Nationale
Ministerul Educatiei Nationale
Bir birimize Bursa'da herzaman Kaliteye sahib cikmaliyiz hangi Bransta olur iseniz olunuz iyi islerde guven verdirmemizde gerekir Bursa Eskort Bulma kalitesi ile herzaman ust siralarda Queen gibi olmasi tesaduf degil. bakiyoruz genelde pacoz kadinlar oluyor normal modellerde bu pacozlarin yaninda kala kala onlara benziyorlar gercekten en guzel ve kaliteli olanlari secip burada paylasiyoruz.\n\nEskort olarak is yapiyorlar ama Serseri gibiler her daim bakimli ve seksi bir gorunuse sahip olmaya sizleri ve bizleri herzaman en ust seviyede memnun etmeyi hedefliyorlar.
Escort bayanlarından en guzelleride burada bulacaksiniz
http://www.research.gov.ro/ :: MCI
Ministerul Cercetarii şi Inovarii
UEFISCDI
Unitatea Executiva pentru Finantarea Invatamantului Superior, a Cercetarii, Dezvoltarii si Inovarii
ANELIS PLUS
“Acces național electronic la literatura științifică și de cercetare”