Article
Engineering, Multidisciplinary
Xin Zhang, Hui Wang, Borui Hou, Jiawen Xu, Ruqiang Yan
Summary: The EMI-based damage identification method is a non-destructive testing approach that reveals the health conditions of a structure by comparing the frequency response function. A new method is proposed in this study, which does not require baselines or handcrafted features, and achieves accurate damage identification using a one-dimensional convolutional neural network.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2022)
Article
Multidisciplinary Sciences
Ke Song, Heyu Hu
Summary: This paper proposes a control scheme to improve the force/position control performance of robots in contact with the environment. The scheme includes dynamic parameter identification, trajectory scaling, and computed-torque control based on adaptive parameter estimation. The dynamic equation and its regression matrix are obtained using the Newton-Euler method, and the least-square method is used to calculate the values of the dynamic parameters. The identified parameters are then used in the adaptive parameter estimation to obtain the torque, and trajectory scaling is applied to control the contact force. Simulation results show that the comprehensive application of these methods can improve the control performance of robots.
Review
Engineering, Civil
Pei Cao, Shengli Zhang, Zequn Wang, Kai Zhou
Summary: High-frequency electromechanical impedance measured from piezoelectric transducer is an effective indicator for inferring minor damage. Two numerical frameworks, inverse model updating and forward damage prediction, have been developed for damage identification based on electromechanical impedance. This article provides a brief review of the state-of-the-art studies in terms of these two frameworks, discussing different methods, their limitations, and future directions.
Article
Engineering, Multidisciplinary
Wongi S. Na
Summary: Bolted joints are widely used in engineering but can lead to bolt loosening, affecting the structure's safety. This study investigates a low-cost inspection system using piezoelectric sensors and reattachable devices to mitigate bolt loosening, showing promising results.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Tairen Sun, Zekai Wang, Chen He, Lihong Yang
Summary: An adaptive robust admittance control strategy is proposed for robot-environment interaction. The environmental impedance is estimated and an adaptive robust admittance controller is designed to track the admittance trajectory with the prescribed performance.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Electrical & Electronic
Lingling Fan, Zhixin Miao
Summary: The research aims to design time-domain measurement-based admittance identification methods for utilizing event data for online admittance identification. The identified s-domain admittance is used for eigenvalue analysis and accurate stability prediction. The tool is tested on two electromagnetic transient (EMT) computer simulation testbeds, demonstrating offline and online admittance identification with data from events.
IEEE TRANSACTIONS ON POWER SYSTEMS
(2021)
Article
Chemistry, Analytical
Quang-Quang Pham, Ngoc-Loi Dang, Jeong-Tae Kim
Summary: This paper introduces a piezoelectric sensor-embedded smart rock for monitoring internal concrete damage in a prestressed anchorage zone. The prototype of the smart rock is designed to sensitively detect impedance signatures induced by concrete damage. Experimental tests show that the sensor-embedded smart rock successfully detects internal concrete damage, demonstrating its potential for anchorage zone health monitoring.
Article
Acoustics
Wenxiang Ding, Maxime Bavencoffe, Marc Lethiecq
Summary: The study focuses on monitoring the performance of a single-element probe using electromechanical admittance (EMA)-based method to detect and repair defects affecting the performance in a timely manner.
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2021)
Article
Engineering, Electrical & Electronic
Shenggeng Wang, Hua Wang, Weicheng Zheng, Zengtao Yang
Summary: This article introduces a method for identifying liquid properties using a 1-3 piezoelectric composite sensor, deriving an analytical solution for the impedance of the sensor when interacting with liquid. Experimental results validate the accuracy of the model, and show that it has a higher resolution compared to the frequency drift method.
IEEE SENSORS JOURNAL
(2021)
Article
Engineering, Multidisciplinary
Xuyun Ding, Xiaojun Wang, Yongbo Yu, Wenpin Chen, Linxi Zeng
Summary: This paper proposes an adaptive damage imaging method based on guided wave signals for accurate damage localization in an unknown load environment. By establishing a mathematical model between the characteristics of the guided wave signal and the load, the adaptive compensation of the guided wave signal is achieved through the real-time identified load. The alternating time-reversal phase synthesis method is used for accurate damage localization.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2023)
Article
Acoustics
Alexis Bottero, Simone Sternini, Jit Sarkar, W. A. Kuperman
Summary: The feasibility of using a known elastic target near the seabed to infer characteristics of marine sediment is investigated in this study. The approach involves determining the admittance matrix of the elastic object numerically or experimentally and predicting the object's acoustic signature using the equivalent source method coupled with a spectral representation of the Green's functions. Synthetic inversions are performed to infer burial depth and source-object range.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2022)
Article
Materials Science, Ceramics
Xiangming Xiong, Xiaotian Li
Summary: The study extends the one-dimensional radial vibration model of piezoelectric disks by performing asymptotic analysis of thin disks, accurately predicting the maximum admittance frequency for different thickness-to-diameter ratios of Pz27 disks.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Construction & Building Technology
Chi-Thien Nguyen, Thanh-Truong Nguyen, Trung-Hau Nguyen, Ba-Tung Le, Tran-De-Nhat Truong, Duc-Duy Ho, Thanh-Canh Huynh
Summary: This study explores the feasibility of using the admittance-based method to detect simulated damage in the bearing plate of a prestressed anchorage. The method was first numerically demonstrated to detect fatigue cracks and preload changes in a fixed-fixed beam-like structure. Then, experimental verification was conducted using a lab-scale prestressed anchorage model, and the presence of damage was identified through the change in the admittance spectrum measured before and after the simulated damage cases. The results showed consistent shifts in the admittance spectrum for both numerical and experimental scenarios, successfully identifying the simulated damages.
Article
Automation & Control Systems
Salar Hatam, Saber Mohammadi, Akram Khodayari
Summary: The mechanical vibration energy harvesting method using multi-switch circuit with adaptive inductance aims to maximize harvested energy by connecting the vibrating piezoelectric element to a special interface circuit. Compared to the standard simple resistive circuit, this new method can achieve 2 to 10 times higher harvested power in different frequency ranges, demonstrating significant improvement in energy collection efficiency.
INTERNATIONAL JOURNAL OF CONTROL AUTOMATION AND SYSTEMS
(2021)
Article
Engineering, Multidisciplinary
Said Quqa, Sijia Li, Yening Shu, Luca Landi, Kenneth J. Loh
Summary: This paper explores the efficacy of supervised machine learning in solving the inverse electrical impedance tomography problem and reconstructing the conductivity distribution of a piezoresistive sensing film. A deep neural network is used to reconstruct the conductivity distribution within the painted area by using voltage measurements collected at sparse boundary locations. The paper presents a new approach to test the suitability of synthetic datasets built using a finite element model of the sensing film. Promising results are obtained compared to conventional methods.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2023)
Article
Engineering, Mechanical
Jinki Kim, K. W. Wang
NONLINEAR DYNAMICS
(2018)
Article
Engineering, Multidisciplinary
Jinki Kim, Kon-Well Wang
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2019)
Article
Instruments & Instrumentation
Jinki Kim, Patrick Dorin, K. W. Wang
SMART MATERIALS AND STRUCTURES
(2020)
Article
Materials Science, Multidisciplinary
J. Kim, L. Sapp, M. Sands
Summary: This research proposes a non-contact method to simultaneously measure the Young's and shear moduli of soft matter such as translucent elastic hydrogels. The modal characteristics of the hydrogel samples are extracted and the mechanical properties are calculated using analytical models. Numerical and experimental results demonstrate the reliability of the proposed method.
EXPERIMENTAL MECHANICS
(2022)
Article
Engineering, Electrical & Electronic
Matthew Sands, Jinki Kim
Summary: Advancements in biomedical and engineering fields require a better understanding of soft structures. Soft materials like gelatin and gelatin-based hydrogels are popular for various applications, but accurately characterizing their dynamic behavior remains challenging.
Article
Acoustics
Jinki Kim, Ryan L. Harne, K. W. Wang
Summary: This research proposes an online signal denoising strategy using stochastic resonance in a parallel array of bistable systems. The original noisy input is adaptively scaled, and the scaling factor is determined based on the analytically predicted optimal noise level and the ambient noise level. Experimental validation using a bistable Duffing circuit system demonstrates the potential of this approach in enhancing online signal denoising.
JOURNAL OF VIBRATION AND ACOUSTICS-TRANSACTIONS OF THE ASME
(2022)
Proceedings Paper
Engineering, Mechanical
Patrick Dorin, Jinki Kim, K. W. Wang
ACTIVE AND PASSIVE SMART STRUCTURES AND INTEGRATED SYSTEMS XIII
(2019)
Proceedings Paper
Engineering, Mechanical
Jinki Kim, Ryan L. Harne, K. W. Wang
HEALTH MONITORING OF STRUCTURAL AND BIOLOGICAL SYSTEMS 2017
(2017)
Article
Engineering, Mechanical
Jinki Kim, R. L. Harne, K. W. Wang
JOURNAL OF COMPUTATIONAL AND NONLINEAR DYNAMICS
(2017)
Proceedings Paper
Engineering, Aerospace
Jinki Kim, K. W. Wang
SENSORS AND SMART STRUCTURES TECHNOLOGIES FOR CIVIL, MECHANICAL, AND AEROSPACE SYSTEMS 2014
(2014)
Article
Acoustics
Jinki Kim, R. L. Harne, K. W. Wang
JOURNAL OF VIBRATION AND ACOUSTICS-TRANSACTIONS OF THE ASME
(2015)