SSTL APSS-SHM lab SHM: Damage Locating Vector 7/9/2009 Shinae Jang.

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Presentation transcript:

SSTL APSS-SHM lab SHM: Damage Locating Vector 7/9/2009 Shinae Jang

SSTL APSS-SHM lab Three Stages of SHM 1.Data measurement/acquisition Sensors and data acquisition equipment 2. System identification Extracting structural features 3. Condition assessment Damage detection algorithm Impulseresponse Transferfunction Damageindex

SSTL APSS-SHM lab Damage Definition “ Damage can be defined as changes introduced into a system that adversely affects its current or future performance (Sohn et al, 2003) ”Damage Linear CorrosionConcreteerosionConcretecracking Nonlinear CrackopeningFatigue Scope of this method Steel corrosion Concrete erosion Concrete cracking Crack open/closing Fatigue damage

SSTL APSS-SHM lab Vibration-based SHM Algorithms Natural frequency changes Mode shapes Modal strain energy Flexibility matrix Time (sec) Acceleration Freq (Hz) Freq response function

SSTL APSS-SHM lab Damage Locating Vector (DLV) Method What is the DLV? (Bernal, 2002) Load vectors that induce zero stress at the damaged elements Null space of the change of the flexibility matrices before and after damage Procedure Datameasurements Calculation of DLVs NormalizedAccumulated Stress (NAS) Undamaged &damaged Numerical Model Structuralanalysis SVD of flexibility change matrix NormalizationSummation Damage indicator

SSTL APSS-SHM lab Example Spring NAS

SSTL APSS-SHM lab Decentralized Computing Strategy (Gao) Damage detection by a segment of structure Data processing in a segment Effective and economic data processing Complete scan using limited sensors Reliable and robust damage detection by overlapping and comparison

SSTL APSS-SHM lab Experimental Parameters Distributed computing strategy: Group 1-11 Element 8: 40% stiffness reduction Group1 2 10Group11...

SSTL APSS-SHM lab Lab-scale Experiments Acceleration Measurement System Wired accelerometer PCB 353B33 Sensitivity: 100 mV/g Freq. range: 1 – 4,000 Hz Measurement range: ±50 g Signal conditioner PCB442B104: 100x NI AA filter module: SCXI 1141 NI DAQ-Pad 6052 E Accelerometers Signal conditioner Computer NI Chassis: SCXI 1411

SSTL APSS-SHM lab Results

SSTL APSS-SHM lab Demonstration

SSTL APSS-SHM lab Assignment Download SHM lab package Data set on the truss model Numerical model DLV code Assignment Due midnight today One report per group Send to