Application of Tooth Gear Impact-Echo System for Repeated and Rapid Data Acquisition
Developments in air-coupled testing hardware in impact-echo (IE) tests have enabled new levels of scanning tests for concrete bridge decks. A tooth gear IE system has been developed using tooth gears as impactors and microelectromechanical systems (MEMS). Since the tooth gear moves and generates imp...
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doaj-05f1e11cd0ae47b9a9342bc93851718c2020-11-25T03:48:26ZengMDPI AGApplied Sciences2076-34172020-07-01104784478410.3390/app10144784Application of Tooth Gear Impact-Echo System for Repeated and Rapid Data AcquisitionJinyoung Hong0Hajin Choi1Tae Keun Oh2School of Architecture, Soongsil University, Seoul 06978, KoreaSchool of Architecture, Soongsil University, Seoul 06978, KoreaDepartment of Safety Engineering, Incheon National University, Incheon 22012, KoreaDevelopments in air-coupled testing hardware in impact-echo (IE) tests have enabled new levels of scanning tests for concrete bridge decks. A tooth gear IE system has been developed using tooth gears as impactors and microelectromechanical systems (MEMS). Since the tooth gear moves and generates impacts itself, this system collects a large amount of test data across the field continuously. The contact duration of two different tooth gears is evaluated and the contact mechanism is compared to a conventional steel ball impactor by a high-speed camera. The data measurements were carried out on concrete slabs, where artificial delaminations were embedded at different depths. Based on our IE experiments, reducing the pitch or increasing the number of teeth was required to decrease the contact duration and generate the thickness mode frequency from deep delaminations. Rapidly obtained time domain data were transferred to the frequency-time domain using spectrograms to identify the dominant frequency band of the signal set. The results show that the developed system enabled us to acquire high-quality data during air-coupled IE tests and spectrogram analysis provided meaningful frequency information and verified its repeatability.https://www.mdpi.com/2076-3417/10/14/4784impact-echotooth gear impactorcontact durationdelaminationrapid scanningnon-destructive testing |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jinyoung Hong Hajin Choi Tae Keun Oh |
spellingShingle |
Jinyoung Hong Hajin Choi Tae Keun Oh Application of Tooth Gear Impact-Echo System for Repeated and Rapid Data Acquisition Applied Sciences impact-echo tooth gear impactor contact duration delamination rapid scanning non-destructive testing |
author_facet |
Jinyoung Hong Hajin Choi Tae Keun Oh |
author_sort |
Jinyoung Hong |
title |
Application of Tooth Gear Impact-Echo System for Repeated and Rapid Data Acquisition |
title_short |
Application of Tooth Gear Impact-Echo System for Repeated and Rapid Data Acquisition |
title_full |
Application of Tooth Gear Impact-Echo System for Repeated and Rapid Data Acquisition |
title_fullStr |
Application of Tooth Gear Impact-Echo System for Repeated and Rapid Data Acquisition |
title_full_unstemmed |
Application of Tooth Gear Impact-Echo System for Repeated and Rapid Data Acquisition |
title_sort |
application of tooth gear impact-echo system for repeated and rapid data acquisition |
publisher |
MDPI AG |
series |
Applied Sciences |
issn |
2076-3417 |
publishDate |
2020-07-01 |
description |
Developments in air-coupled testing hardware in impact-echo (IE) tests have enabled new levels of scanning tests for concrete bridge decks. A tooth gear IE system has been developed using tooth gears as impactors and microelectromechanical systems (MEMS). Since the tooth gear moves and generates impacts itself, this system collects a large amount of test data across the field continuously. The contact duration of two different tooth gears is evaluated and the contact mechanism is compared to a conventional steel ball impactor by a high-speed camera. The data measurements were carried out on concrete slabs, where artificial delaminations were embedded at different depths. Based on our IE experiments, reducing the pitch or increasing the number of teeth was required to decrease the contact duration and generate the thickness mode frequency from deep delaminations. Rapidly obtained time domain data were transferred to the frequency-time domain using spectrograms to identify the dominant frequency band of the signal set. The results show that the developed system enabled us to acquire high-quality data during air-coupled IE tests and spectrogram analysis provided meaningful frequency information and verified its repeatability. |
topic |
impact-echo tooth gear impactor contact duration delamination rapid scanning non-destructive testing |
url |
https://www.mdpi.com/2076-3417/10/14/4784 |
work_keys_str_mv |
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