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High Accurate Detection of Inclined Cracksin Concrete Structures Using an Acceleration Pickup
Shozou Miyoshi,Masayuki Okamoto,Shogo Tanaka 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
The present paper proposes a method for the detection of inclined cracks in concrete using an acceleration pickup. The sensor on the concrete surface observes the stationary wave sinside the structure whose frequencies depend on the distance to the crack. The method can recognize the profile of the in clined crack with a high accuracy by the following two procedures. The 1st procedure: we model the sensor output as an output of alinear dynamic system with an unknown parameter and measure the accurate propagation distance from the sensor to the crack by applying a maximum likelihood method at each in spection point. The 2nd procedure: we apply a least squares method considering the reflection efficiency of the elastic waves at the inclined crack and the directivity characteristic of the sensor.