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?