?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=The+influence+of+temperature+on+PZT+sensors+%26+actuators+for+active+vibration+control+of+flexible+structures&rft.creator=Dunbabin%2C+Matthew+D&rft.subject=Vibration&rft.subject=Structural+control+(Engineering)&rft.subject=Piezoelectric+devices&rft.subject=vibration+control&rft.subject=active+control&rft.subject=digital+control&rft.subject=adaptive+contol&rft.subject=sliding+mode+control&rft.subject=characterisation&rft.subject=optimal+control&rft.subject=nonlinear+control&rft.subject=piezoelectric+actuator&rft.subject=piezoelectric+sensor&rft.subject=PZT&rft.subject=flexible+structure&rft.subject=thermal+effects&rft.subject=damping&rft.subject=thesis&rft.subject=doctoral&rft.description=In+real+operating+environments%2C+flexible+structures+exhibiting+dynamic+oscillations+such+as+aircraft+and+spacecraft+can+experience+large+changes+in+temperature+during+their+normal+operating+cycle%2C+typically+in+the+range+-70+to+80+degrees+Celsius.+The+use+of+piezoelectric+actuators+and+sensors+to+control+these+dynamic+oscillations+have+been+widely+explored+at+constant+temperature%2C+although+only+limited+studies+have+been+conducted+on+the+effect+that+varying+temperature+has+on+the+active+control+of+flexible+structures.%0D%0A%0D%0AThe+objective+of+this+research+is+to+study+the+influence+of+PZT+sensors+and+actuators+for+vibration+control+of+flexible+structures+where+nonlinearities+in+piezoelectric+and+structural+material+properties+change+as+the+system+temperatures+vary+significantly+with+time.+This+involved+the+development+of+a+set+of+data+based+parameters+that+enabled+the+accurate+modelling+of+a+nonlinear+flexible+system+in+which+its+dynamics+are+actively+controlled+via+the+use+of+piezoelectric+sensors+and+actuators.+These+parameters+determined+the+design+of+a+control+scheme+to+actively+control+the+system+over+a+large+range+of+operating+temperatures%2C+and+give+an+optimised+control+performance+throughout+its+operating+regime.%0D%0A%0D%0AThe+work+reported+in+this+thesis+describes+selected+methods+for+rapidly+examining+a+number+of+the+more+common+nonlinear+properties+of+PZT+associated+with+vibration+control.+An+extensive+numerical+and+experimental+investigation+is+performed+which+shows+that+when+used+in+active+vibration+control+applications%2C+the+variations+in+PZT+properties+with+temperature+can+ultimately+affect+the+ability+of+the+piezoelectric+actuator+and+sensors+to+suppress+vibration+in+flexible+structures.%0D%0A%0D%0AAccurate+simulation+models+of+the+lightweight+piezo-actuated+cantilevered+structures+were+developed+to+evaluate+the+performance+of+a+number+of+common+vibration+control+schemes+subject+to+significant+temperature+variations.+This+research+was+then+extended+to+an+innovative+scaled+wing-type+structure+subjected+to+temperature+variations.+A+suitable+adaptive+self-tuning+control+scheme+was+developed+and+investigated+numerically+and+experimentally%2C+illustrating+the+benefit+of+adaptive+control+in+this+instance.+The+adaptive+control+technique+was+shown+numerically+and+experimentally+to+provide+improved+settling+times+and+damping+ratios+over+equivalent+fixed+gain+controllers+for+the+class+of+structures+investigated+where+limited+control+authority+exists.%0D%0A%0D%0AThe+experimental+investigation+of+PZT+sensors+and+actuators+has+provided+further+understanding+of+the+nonlinear+behaviour+of+various+light%2C+flexible+structures+where+temperature+effects+on+the+system+dynamics+and+control+are+significant.+This+research+has+unveiled+previously+unreported+nonlinearities+and+has+expanded+on+traditional+nonlinearities.+These+results+can+assist+with+the+detailed+design+of+applications+involving+PZT+sensors+and+actuators+in+for+example+the+aerospace+and+automotive+industries.&rft.publisher=Queensland+University+of+Technology&rft.date=2002&rft.type=Thesis&rft.format=application%2Fpdf&rft.relation=https%3A%2F%2Feprints.qut.edu.au%2F36162%2F7%2F36162_Digitised%2520Thesis-4_Redacted.pdf&rft.rights=free_to_read&rft.rights=http%3A%2F%2Fcreativecommons.org%2Flicenses%2Fby-nc-nd%2F4.0%2F&rft.relation=Dunbabin%2C+Matthew+D+(2002)+The+influence+of+temperature+on+PZT+sensors+%26+actuators+for+active+vibration+control+of+flexible+structures.+PhD+thesis%2C+Queensland+University+of+Technology.&rft.id_number=https%3A%2F%2Feprints.qut.edu.au%2F36162%2F&rft.rights=Copyright+Matthew+D+Dunbabin&rft.identifier=Science+%26+Engineering+Faculty