Next-Generation Wireless Bridge Weigh-in-Motion (WIM) System Integrated with Nondestructive Evaluation (NDE) Capability for Transportation
Infrastructure Safety
CATSS-UTC Symposium, Orlando, FL, Feb 14-15, 2013
Presenter: Li Dong
• Introduction of participants• Project background • Objective• Schedule• Progress• Future Work
Agenda
Participants
• Georgia Tech team:‒ Dr. Yang Wang (PI)‒ Dr. Laurence J. Jacobs (Co-PI)‒ Dr. Jin-Yeon Kim (Co-PI)‒ Dapeng Zhu (Graduate Student)‒ Canny Fang (Graduate Student)‒ Kevin Arne (Graduate Student)
• UAB team: ‒ Dr. Nasim Uddin (Co-PI)‒ Dr. Hua Zhao (Post-Doctor)‒ Dr. Zhisong Zhao (Previous Graduate Student)‒ Li Dong (Graduate Student)‒ Rahul R Kalyankar (Graduate Student)
Project Background (GT)
Pertsch, A., Kim, J.-Y., Wang, Y. and Jacobs, L.J. (2011). "An intelligent stand-alone ultrasonic device for monitoring local structural damage: implementation and preliminary experiments," Smart Materials and Structures, 20(1): 015022.
Project Background (GT) cont.
Concrete bridge component
TransmitterReceiver
Wireless device(in Fig. 4)
Surface crack
Diffuse ultrasonic NDE incorporated to wireless device
Steel specimen with various notches being detected by wireless ultrasonic device
Project Background (GT) cont.
BWIM shemaSiWIM Bridge
Weigh-in-motion
system
Project Background (UAB)
Spider
FAD sensors on slab
B-WIM System Testing on I-459
Weighing sensors on girder
Project Background (UAB) cont.
Project Objective
1 2 3 4 5 6Task 1 Off-the-shelf component selection for wireless device(GT + UAB) Integration of self-powered wireless WIM + NDE device
Laboratory validation experimentsTask 2 Stochastic dynamic analysis for WIM measurement (UAB) Invesigate axle detection using shear sensor
Integration of WIM data for bridge safety assessmentTask 3 Develop wireless NDE device for steel bridge components(GT) Develop diffuse NDE technique for concrete crack
Integrate diffuse NDE into wireless device for concreteField validation of the wireless WIM + NDE system (GT + UAB)Final project report (GT + UAB)
Quarters
Six-Quarter Schedule
-0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
Am
plit
ude(V
)
Depth of the notches(mm)
5MHz 50MHz
0.5 1.0 1.5 2.0 2.5 3.0 3.5
0.5
0.6
0.7
0.8
0.9
1.0
Am
plitu
de tr
ansm
issi
on c
oeffi
cien
t
Depth of the notches (mm)
5MHz 50MHz
Amplitude Amplitude transmission coefficient
,max
,max
notchenvundamagedenv
VT
V
#1 #2
#3#4
#1 #2
#3#4
0.5mm 1.2mm 3.2mm2.3mm undamaged
Undamaged
Comparison between two sampling frequencies
Progress (GT)
Strain TransducerSpecification ST350
Gage length 3 in
Strain resolution ~1με
Strain range ±2000με
Price $455
Circuit Full Wheatstone bridge with 4 active 350Ω foil gages
Supply voltage 1~10V
Full-range linearity error 1%
Sensitivity 2 (μV/V) / με
Progress (GT+UAB)
A2+A3GVW
A1 A2 A3 A4 A5 Single A4+A5
-50
-40
-30
-20
-10
0
10
20
30
40
50
Per
cent
age
err
or (
%)
SiWIM algorithm Proposed algorithm item
Progress (UAB)
Future Work
BWIM field test in Troy Hwy, Montgomery, AL
Thank you!
QUESTIONS?