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다양한 온도조건에서 압전체 센서 자가진단법의 실험적 고찰
조혜진(HyeJin Jo),김은강(EunKang Kim),공예슬(YeSeul Kong),김지민(JiMin Kim),박제운(JeWoon Park),이경이(KyoungLee Lee),이지현(JiHyeon Lee),박규해(Gyuhae Park) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
An active sensor diagnostics procedure, where the sensors/actuators are confirmed to be functioning properly during operation, is a critical component to successfully complete the structural health monitoring (SHM) process. The impedance-based piezoelectric sensor diagnostics process tracks the changes in the capacitive value of piezoelectric materials, which shows up in measured admittance. A change in the capacitive value indicates changes in sensor conditions, including sensor fracture and de-bonding. The effect of temperature variations in the high temperatures and cryogenic range on the performance of the impedance-based piezoelectric sensor diagnostics, along with the sensing capability of piezoelectric active-sensors, was experimentally studied. The results of this study indicate that the impedance-based sensor diagnostic processes is capable of detecting faulty sensors even at the high temperatures and cryogenic temperatures, thereby allowing piezoelectric sensors to be effectively used for dynamics and SHM sensing at high temperature and cryogenic temperature ranges.