?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.relation=http%3A%2F%2Fd-scholarship-dev.library.pitt.edu%2F20788%2F&rft.title=Optimal+wave+propagation-based+nondestructive+test+design+for+quantitative+damage+characterization&rft.creator=Zhanpeng%2C+Hao&rft.description=Nondestructive+testing+(NDT)+has+been+widely+used+for+damage+identification+and+inverse+characterization+of+material+properties+in+several+fields+of+science+and+engineering%2C+from+structural+engineering+to+medicine.+However%2C+there+are+several+common+challenges+inherent+in+the+evaluation+of+structures+and+systems%2C+including+the+potential+for+excessive+computational+expense+and+ill-posedness+of+the+inverse+problem.+Numerical+methods%2C+such+as+the+finite+element+method%2C+provide+substantial+benefits+in+terms+of+solution+capabilities%2C+but+the+analysis+for+NDT+applications+in+realistic+structures+often+requires+substantial+computational+time+and+power.+Furthermore%2C+limitations+on+the+quantity+and+quality+of+measurement+data+can+cause+the+evaluation+problem+to+require+even+more+computational+effort+and%2For+lead+to+solution+non-uniqueness+or+nonexistence.%0D%0A%0D%0AThe+present+work+introduces+a+general+approach+to+optimal+wave+propagation-based+NDT+design+for+damage+characterization+applications.+More+specifically%2C+the+objective+of+this+work+is+to+improve+the+accuracy+and+efficiency+of+the+damage+characterization+process+by+optimizing+the+parameters+of+the+NDT+such+as+the+locations+of+sensors+and+actuators.+The+NDT+design+approach+developed+is+based+on+maximizing+the+sensitivity+of+the+NDT+response+measurements+to+changes+in+the+material+properties+to+be+determined+by+the+evaluation%2C+while+simultaneously+minimizing+the+redundancy+of+response+measurements.+Two+simulated+case+studies+are+presented+to+evaluate+the+performance+of+the+optimal+wave+propagation-based+NDT+design+approach.+Both+examples+consisted+of+thin+plate+structures+with+a+damage+field+that+was+represented+by+changes+in+the+Young's+modulus+distribution+throughout+the+structure.+In+order+to+provide+practical+relevance%2C+the+NDT+method+considered+was+based+on+commonly+used+ultrasonic+testing+with+piezoelectric+sensors+and+actuators.+The+optimal+NDT+designs+corresponding+to+maximized+sensitivity+and+minimized+response+redundancy+are+shown+to+provide+substantially+improved+evaluation+solution+efficiency+and+accuracy+for+quantitative+damage+characterization+in+comparison+to+standard+approaches.&rft.date=2014-06-16&rft.type=University+of+Pittsburgh+ETD&rft.type=PeerReviewed&rft.format=application%2Fpdf&rft.language=en&rft.identifier=http%3A%2F%2Fd-scholarship-dev.library.pitt.edu%2F20788%2F1%2Fhaoz_etd2014.pdf&rft.identifier=++Zhanpeng%2C+Hao++(2014)+Optimal+wave+propagation-based+nondestructive+test+design+for+quantitative+damage+characterization.++Master's+Thesis%2C+University+of+Pittsburgh.++++(Unpublished)++