Results 21 to 30 of about 438 (134)

A Novel Fractal Contact-Electromechanical Impedance Model for Quantitative Monitoring of Bolted Joint Looseness

IEEE Access, 2018
Bolted joint are among the key components that enable the robust assembly of a wide variety of structures. However, due to wear and tear over time, bolted joint may loosen, and if not detected in its early stages, can lead to devastating results.
Furui Wang, Siu Chun Michael Ho, Linsheng Huo, Gangbing Song   +3 more
doaj   +1 more source

An Experimental Study on the Effect of Temperature on Piezoelectric Sensors for Impedance-Based Structural Health Monitoring

Sensors, 2014
The electromechanical impedance (EMI) technique is considered to be one of the most promising methods for developing structural health monitoring (SHM) systems.
Fabricio G. Baptista, Danilo E. Budoya, Vinicius A. D. de Almeida, Jose Alfredo C. Ulson   +3 more
doaj   +1 more source

Understanding Impedance Response Characteristics of a Piezoelectric-Based Smart Interface Subjected to Functional Degradations

Complexity, 2021
The functionality of piezoelectric devices is of significant importance in the electromechanical impedance (EMI)-based structural health monitoring (SHM) and damage detection.
Ba-Phu Nguyen, Quang Hung Tran, Thanh-Truong Nguyen, Ananta Man Singh Pradhan, Thanh-Canh Huynh   +4 more
doaj   +1 more source

Structural Health Monitoring Using High-Frequency Electromechanical Impedance Signatures

Advances in Civil Engineering, 2010
An overview of recent advances in electromechanical impedance- (EMI-) based structural health monitoring is presented in this paper. The basic principle of the EMI method is to use high-frequency excitation to sense the local area of a structure. Changes
Wei Yan, W. Q. Chen
doaj   +1 more source

A PZT-Based Electromechanical Impedance Method for Monitoring the Soil Freeze–Thaw Process

Sensors, 2019
It is important to conduct research on the soil freeze–thaw process because concurrent adverse effects always occur during this process and can cause serious damage to engineering structures.
Jicheng Zhang, Chuan Zhang, Jiahao Xiao, Jinwei Jiang   +3 more
doaj   +1 more source

Locating Damage Using Integrated Global-Local Approach with Wireless Sensing System and Single-Chip Impedance Measurement Device

The Scientific World Journal, 2014
This study developed an integrated global-local approach for locating damage on building structures. A damage detection approach with a novel embedded frequency response function damage index (NEFDI) was proposed and embedded in the Imote2.NET-based ...
Tzu-Hsuan Lin, Yung-Chi Lu, Shih-Lin Hung   +2 more
doaj   +1 more source

Effect of External Vibration on PZT Impedance Signature

Sensors, 2008
Piezoelectric ceramic Lead Zirconate Titanate (PZT) transducers, working on the principle of electromechanical impedance (EMI), are increasingly applied for structural health monitoring (SHM) in aerospace, civil and mechanical engineering.
Yaowen Yang, Aiwei Miao
doaj   +1 more source

Mechanical and Non-Destructive Study of CFRP Adhesive Bonds Subjected to Pre-Bond Thermal Treatment and De-Icing Fluid Contamination

Aerospace, 2018
Composite materials are commonly used in many branches of industry. One of the effective methods to join the carbon fibre reinforced polymer (CFRP) parts includes the use of adhesives.
Paweł H. Malinowski, Konstantinos I. Tserpes, Romain Ecault, Wiesław M. Ostachowicz   +3 more
doaj   +1 more source

Effects of Applying Different Resonance Amplitude on the Performance of the Impedance-Based Health Monitoring Technique Subjected to Damage

Sensors, 2018
Smart materials such as piezoelectric transducers can be used for monitoring the health of building structures. In this study, a structural health monitoring technique known as the electromechanical impedance (EMI) method is investigated.
Wongi S. Na, Dong-Woo Seo, Byeong-Cheol Kim, Ki-Tae Park   +3 more
doaj   +1 more source

Sandwich Face Layer Debonding Detection and Size Estimation by Machine-Learning-Based Evaluation of Electromechanical Impedance Measurements

Sensors, 2023
The present research proposes a two-step physics- and machine-learning(ML)-based electromechanical impedance (EMI) measurement data evaluation approach for sandwich face layer debonding detection and size estimation in structural health monitoring (SHM ...
Christoph Kralovec, Bernhard Lehner, Markus Kirchmayr, Martin Schagerl   +3 more
doaj   +1 more source