1 Real Time Visualization of Structural Response through Wireless Communication using MEMS Sensors Real Time Visualization of Structural Response through Wireless Communication using MEMS Sensors Presented by Tomoyuki Enomoto Hung-Chi Chung, Tomoyuki Enomoto, Kenneth Loh*, Supervised by Masanobu Shinozuka Civil and Environmental Engineering University of California, Irvine CA *REU student (from Johns Hopkins University)
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Real Time Visualization of Structural Response through Wireless
Communication using MEMS Sensors
Real Time Visualization of Structural Response through Wireless
Communication using MEMS Sensors
Presented by Tomoyuki EnomotoHung-Chi Chung, Tomoyuki Enomoto, Kenneth Loh*,
Supervised by Masanobu ShinozukaCivil and Environmental Engineering
University of California, Irvine CA*REU student (from Johns Hopkins University)
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ContentsContentsBackgroundObjective Proposed MethodologyPreliminary Study
Analog Devices MEMS Acc ADXL202E Silicon Designs MEMS Acc SD2210
Real Time Visualization of Response of Steel BridgeBridge Response under Jumping Load Simulation with SAP 2000SummaryFuture PlanReferences and Acknowledgment
BackgroundObjective Proposed MethodologyPreliminary Study
Analog Devices MEMS Acc ADXL202E Silicon Designs MEMS Acc SD2210
Real Time Visualization of Response of Steel BridgeBridge Response under Jumping Load Simulation with SAP 2000SummaryFuture PlanReferences and Acknowledgment
!Cable-based data acquisition systems present some difficulties for structural health monitoring
!Cabling and electromagnetic interference
!Early damage detection (even invisible)!Effective, economical and long-term
structural inspection and maintenance
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Background ~Micro-Electro Mechanical SystemsBackground ~Micro-Electro Mechanical Systems
Rapid advances of MEMS technologies such as mechanical elements, sensors, actuators, and electronics on a common silicon substrate through micro fabrication technology
Advantages of MEMS Accelerometer!Small
!Low-cost!Low Power Consumption
Analog Deviceshttp://www.analog.com/
MEMSnethttp://www.memsnet.org/
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ObjectiveObjective
Development of a reliable and robust devices with MEMS accelerometer and wireless transmitter for the structure monitoring in a field environments
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Preliminary StudyPreliminary Study
Experimental Setup
ADXL202E UnitShaker Test
Silicon Designs (SD) 2210-002 Unit
http://www.silicondesigns.com/
SD Unit Technical Flow
Shaker Test
Impact Experiment
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Experimental Set UpExperimental Set Up
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ADXL202EADXL202EMost Popular MEMS AccelerometerLow Cost & Low Power Consumption2 Axis; ±2g
4”
2-1/2”
ADXL202E MEMS Accelerometer
ADXL202E MEMS Accelerometer
44””
22-1/21/2”
RS232 PortRS232 Port
Battery RoomBattery Room
Micro ControllerMicro Controller
Main board of sensor
ADXL202E
Transmitter & Receiver Unit
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Shaker Test of ADXL202E Sensor UnitShaker Test of ADXL202E Sensor Unit
Noise level is too high for bridge health monitoring
RMS = 3.0mg
-15
-10
-5
0
5
10
15
0 0.5 1 1.5 2 2.5 3Time (s)
Acc (
mg)
0
0.2
0.4
0.6
0.8
1
1.2
1.4
10 100 1000
Acceleration (mg)
AD
XL U
nit/ R
efe
rence A
cc
Shaker test at 2Hz 10mg Linearity Curve
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Silicon Designs SD-2210-002Silicon Designs SD-2210-002Low Cost & Low Power Consumption
1Axis; ±2g
Bigger Mass than ADXL 202E
Wide Range of Output Voltage;± 4V against ± 2g http://www.silicondesigns.com/
"LoadingImpact load simulated by rectangular function
Load
(kg)
120
1.00
0.03 Time (s)
0
500
1000
1500
2000
2500
3000
3500
4000
4500
0 5 10 15 20
Frequency (Hz)
Pow
er
Spe
ctr
al
Damping Ratio = 0.01
Damping Ratio = 0.02
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SummarySummaryADXL202E is popular, low cost, and low power consumption. It is good for detection of larger acceleration such as severe earthquakes.
Silicon Design SD-2210-002 shows better performance than ADXL202E in noise level. SD-2210 can measure much smaller acceleration. It provides a good sensor option for bridge healthmonitoring.
SD-2210 is integrated with wireless transceiver module in a sensor system. Real-time visualization on laptop computer is demonstrated for the first time in the field test.
In the field test, cable based traditional accelerometer is also used. Comparison show the reliability of wireless device and data acquisition system for bridge health monitoring.
Results of structural analysis by SAP 2000 show the validity of the experimental results.
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Future PlanFuture Plan
Apply developed sensor units to Caltrans’ highway bridges for ambient vibration experiment
Power consumption is a problem to be solved. By using a 9V battery in a sensor unit, the battery power can run out in 5 hours.
Apply Bluetooth module for Multiple wireless communication
Solar Power for the power consumption problem
Long-term Future Plan
Near Future PlanNear Future Plan
Long-term Future Plan
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Caltrans’ freeway bridgesCaltrans’ freeway bridgesWest St. On-RampWest St. On-Ramp
Jamboree Rd. Overcrossing
Jamboree Rd. Overcrossing
West St. On-Ramp
UCI
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ReferencesReferences1. J. Lynch, K. Law, A. Kiremidjian, E. Carryer, T. Kennedy, A.
Partridge, A Sundararajan, (2002), “Validation of a wireless modular monitoring system for structures”, the SPIE 9th Annual International Symposiums on Smart Structures and Materials, San Diego, CA, USA, March 17-21.
2. High Performance Wireless Research and Education Network (HPWREN), http://hpwren.uscd.edu
This research is supported by the National Science Foundation (NSF) and Federal Highway Administration (FHWA) through the Multidisciplinary Center for Earthquake Engineering Research (MCEER), and also by California State Department of Transportation (CalTrans).