Liu, Gongyuan
(2021)
Design of Piezoelectric Weigh-in Motion Systems Based on PZT Material Composite Structure.
Master's Thesis, University of Pittsburgh.
(Unpublished)
Abstract
Weigh-in-Motion (WIM) is the process of measuring the dynamic tire forces while the vehicles are in motion and estimating the corresponding static loads of vehicles at rest. In this thesis, two piezoelectric weigh-in-motion systems that involve bending and compression mode structural design are developed. Lead Zirconate Titanate (PZT) ceramic plate is chosen as the sensing element of the sensor because of its large piezoelectric charge coefficient, moderate permittivity, and high coupling factor. The relations between output charge, voltage, and applied loads of each design were derived theoretically. A charge-amplifier circuit was designed to make the output signal readable. The performance of compression mode and bending mode structure were compared. In the experiment, the hand truck with different weights is used to roll over the sensors. The results show that the compression mode performs good linearity under different mass and speeds. The experimental sensitivity of the compression mode is very close to the theoretical value. For bending mode, the experimental output voltage is much smaller than the compression mode, and it is highly affected by the speed of the hand truck. The experimental sensitivity is more closed to the theoretical value when the speed is higher. Then, Fourier transform was used to get the frequency spectrum of the output signal. By observing the output signals, we found that its dominant frequency was related to the vehicle's speed, but the estimated speed is not accurate. A Bluetooth wireless transmission unit is also designed to realize the wireless monitoring of the vehicle weight.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
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| Date: |
13 June 2021 |
| Date Type: |
Publication |
| Defense Date: |
7 April 2021 |
| Approval Date: |
13 June 2021 |
| Submission Date: |
30 March 2021 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Number of Pages: |
82 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Swanson School of Engineering > Mechanical Engineering |
| Degree: |
MS - Master of Science |
| Thesis Type: |
Master's Thesis |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
Piezoelectric sensor,
PZT,
Weigh-in-Motion system |
| Date Deposited: |
13 Jun 2021 18:51 |
| Last Modified: |
13 Jun 2021 18:51 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/40466 |
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