Article
Engineering, Electrical & Electronic
Muhammad Syamil Mohd Sa'ad, Harith Ahmad, Muhamad Zharif Samion, Mohamad Ashraff Alias, Muhammad Khairol Annuar Zaini, Lim Kok Sing, Kenneth T. V. Grattan, B. M. Azizur Rahman, Gilberto Brambilla, Sulaiman Wadi Harun, Mohammad Faizal Ismail
Summary: A fiber Bragg grating-based inclinometer probe with enhanced sensitivity has been developed for slope or ground movement monitoring. The probe is fabricated using a 3D printer and has a similar size to the conventional probe, with better resolution and sensitivity.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Engineering, Electrical & Electronic
Dongtao Hu, Shanke Lv, Yongxing Guo, Huagang He, Jiayi Liu
Summary: The article presents a fiber Bragg grating (FBG) force sensor with enhanced sensitivity using a strain-reinforcing mechanism, achieving high sensitivity and good performance, demonstrating potential for superior structural health monitoring.
IEEE SENSORS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Liqi Huang, Li Xiong, Yongxing Guo, Zhongchun Hu
Summary: This research proposes an innovative method for fabricating all-silicon sensors by using silicon glass as the substrate and packaging material. The proposed approach, which involves packaging an elastic glass cantilever beam and an FBG with molten glass powder, has been tested and shown to have good package quality and sensing performance. The introduced packaging technology has potential applications in the fabrication of high-performance FBG sensors, as demonstrated by the successful creation of an FBG tilt sensor with good linearity and repeatability.
IEEE SENSORS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Yongxing Guo, Li Xiong, Heng Wu, Wanhuan Zhou, Xinglin Zhou, Honghai Liu
Summary: This article proposes a reusable and distributed fiber Bragg grating (FBG) inclinometer for simultaneous measurement of horizontal deformation and vibration induced by sudden deformation, providing more extensive monitoring for slopes.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2021)
Article
Engineering, Electrical & Electronic
Abdollah Malakzadeh, Mohsen Mansoursamaei, Rasoul Pashaie
Summary: This study proposes a new method for simultaneous measurement of temperature and strain using a single uniform FBG, based on peak power changes and Bragg wavelength shifts. The peak power and Bragg wavelength of the FBG are sensitive to strain changes and temperature, allowing for accurate measurement of both parameters.
OPTICAL AND QUANTUM ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Francesco Fienga, Vincenzo Romano Marrazzo, Leonardo Sito, Francesco Giordano, Noemi Beni, Zoltan Szillasi, Andrea Irace, Wolfram Zeuner, Benoit Salvant, Salvatore Buontempo, Giovanni Breglio
Summary: In the field of accelerator physics, it is crucial to monitor temperature-related parameters during the operations to prevent damages caused by RF beam-induced heating (BIH). Fiber Bragg grating sensors (FBGs) are proven to meet the requirements for monitoring in harsh environments. This study validates the use of FBGs for measuring RF BIH and highlights its potential in improving accelerator design and operation.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Optics
Xianfeng Zhao, Zhen'an Jia, Wei Fan, Wangfei Liu, Hong Gao, Kaiqing Yang, Dakuan Yu
Summary: The FBG accelerometer based on a composite beam utilizes the opposite movement of two FBGs to reduce the impact of temperature and improve sensitivity. Experimental results demonstrate that the sensor structure is minimally affected by temperature within a certain range and has good performance at specific frequency ranges.
Article
Engineering, Electrical & Electronic
Yongxing Guo, Jiajing Zhu, Li Xiong, Jiaxi Guan
Summary: This paper proposes a new finger motion detection method based on optical fiber Bragg grating (FBG) with polyimide substrate, which monitors the deformation around the forearm caused by finger motion. Through tests, it is verified that FBG with polyimide substrate has good response characteristics and applicability. The experimental results show that this method can effectively detect static gestures and has good repeatability.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Engineering, Electrical & Electronic
Chaoyang Shi, Dewei Lai, Zhongxin Tang, Zhan Yang
Summary: This paper proposes a miniature and high-sensitivity torque sensor for minimally invasive surgery robots and multi-finger robotic hands. The sensor consists of a torquesensitive flexure and a suspended optic fiber with a Fiber Bragg Grating (FBG) element, providing excellent resistance to moment loadings and high resolution.
IEEE SENSORS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Dewei Lai, Zhongxin Tang, Jianchang Zhao, Shuxin Wang, Chaoyang Shi
Summary: This paper presents a high sensitivity and miniature size torque sensor based on FBG, utilizing a special design to achieve high resolution and linearity. The sensor's performance has been validated through simulation optimization and calibration.
IEEE SENSORS JOURNAL
(2021)
Article
Optics
Ching-Yu Hsu, Chia-Chin Chiang, Tso-Sheng Hsieh, Hsiang-Cheng Hsu, Liren Tsai, Chang-Hsiang Hou
Summary: This study evaluated the performance of titanium nitride-coated Fiber Bragg grating sensors in cryogenic temperature environments, demonstrating high temperature sensitivity and accuracy for precise measurements of temperature changes at low temperatures.
OPTICS AND LASER TECHNOLOGY
(2021)
Review
Computer Science, Information Systems
Siti Musliha Aishah Musa, Mohd Haziq Dzulkifli, Asrul Izam Azmi, Siti Azlida Ibrahim
Summary: This paper provides a comprehensive review of the application of Fiber Bragg Grating (FBG) as a multiparameter sensor in Fiber-Reinforced Plastic (FRP) composites. The review is divided into embedded FBGs and surface-attached FBGs, further categorized based on different applications. Issues and comparative analysis between the two techniques are discussed, followed by recommendations for embedding conditions and techniques. The review concludes with a future outlook on FBGs as sensors, particularly in composite laminates.
Article
Engineering, Electrical & Electronic
Suneetha Sebastian, P. Shiva Prasad, Kiran Michael, Sandhya Avvaru, Sundarrajan Asokan
Summary: This article presents a method to improve the hydro-acoustic sensitivity of fiber Bragg grating (FBG) sensors through clad-etching and polymer packaging. The proposed underwater acoustic sensor system is characterized and validated using a standard lead zirconate titanate (PZT)-based hydrophone, achieving a significant enhancement in acoustic pressure sensitivity compared to a bare FBG sensor. The system demonstrates excellent linear response and repeatability, with a minimum detectable acoustic pressure of approximately 1 Pa/ (Hz)(1/2) and a maximum responsivity of approximately 100 nm/MPa.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Xiaobin Xue, Xile Han, Linhao Li, Li Min, Daotong You, Tuan Guo
Summary: Respiration rate and volume are important physiological indicators of human health, which can reflect cardiovascular health status and cardiopulmonary function. In this study, a compact breath monitoring system based on a wearable tilted fiber Bragg grating (TFBG) curvature sensor is demonstrated. The TFBGs provide highly sensitive, real-time response to curvature changes during respiration, assisted by a custom designed breathing tube. The proposed miniaturized and cost-effective sensing system consists of a tunable laser module, a field programmable gate array acquisition control circuit module, and a sensor module, and different breathing patterns can be successfully identified from the output of the sensor.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
N. N. Ismail, A. S. Sharbirin, M. S. M. Sa'ad, M. K. A. Zaini, M. F. Ismail, G. Brambilla, B. M. A. Rahman, K. T. V. Grattan, H. Ahmad
Summary: A novel 3D-printed biaxial sensor system for tilt measurement has been developed, based on four Fiber Bragg Grating (FBG) devices. The compact design of the sensor system offers excellent responsivity and high linearity over the tilt range of 0 degrees +/- 90 degrees. Fabricated using 3D-printing method, this sensor system is cost-effective and has a wide range of potential industrial applications.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Engineering, Geological
Hua Li, Jianhui Deng, Jianhua Yin, Shengwen Qi, Bowen Zheng, Jianbo Zhu
Summary: Understanding the shear behavior of rough joints is important in rock engineering, especially under dynamic loadings. This study investigated joint shear behavior at different shear rates and developed a rate-dependent constitutive model. The findings suggest that the shear strength of joints varies with roughness and shear rate, with a proposed viscous joint model showing promise in describing shear stiffness evolution.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Engineering, Geological
Kai Liu, Zhen-Yu Yin, Wen-Bo Chen, Wei-Qiang Feng, Jian-Hua Yin
Summary: This study formulated a new nonlinear model to describe the behaviors of granular materials under unsaturated conditions, incorporating factors such as nonlinear stiffness, nonlinear stress dilatancy, and critical state to enhance model performance. Experimental results showed that the model could effectively consider the suction effect, reproducing the behavior of unsaturated granular materials adequately.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2021)
Article
Engineering, Geological
Zejian Chen, Wen-Bo Chen, Jian-Hua Yin, Numan Malik
Summary: Debris at the bottom of a rock socket significantly influences shaft friction and load transfer characteristics of a pile. Shaft friction is more dominant and end-bearing stress is reduced when debris exists, affecting the mechanical behavior of the pile under cyclic and static loading.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2021)
Article
Energy & Fuels
Huaibo Song, Huafu Pei, Chao Zhou, Dujian Zou, Chunyi Cui
Summary: This paper proposes an analytical model to determine the representative temperature change for the geotechnical design of energy piles. The model effectively calculates the temperature change and avoids cumbersome numerical simulations and computing, making it highly applicable.
GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT
(2022)
Article
Engineering, Geological
Peichen Wu, Daoyuan Tan, Shaoqun Lin, Wenbo Chen, Jianhua Yin, Numan Malik, An Li
Summary: Hong Kong has a history of using masonry retaining walls to stabilize slopes, but extreme weather and tree colonization can cause instability. A monitoring and warning system using fiber Bragg grating sensing technology has been designed to detect movement and sway. The system has been tested and proven to be feasible and reliable.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2022)
Article
Engineering, Marine
Bin Zhu, Tetsuya Hiraishi, Hajime Mase, Huafu Pei, Qing Yang
Summary: This study presents a probabilistic analysis of wave-induced dynamic responses in a poroelastic sloping seabed by using a random finite element method. The spatial variabilities of marine soil properties are considered using random field theory. The response of the seabed is analyzed based on Biot's theory and linear wave theory, and Monte Carlo simulations are carried out to obtain the statistics and associated uncertainties. The effects of cross-correlation of random fields and the slope angle on the response are also investigated.
Article
Engineering, Geological
Huaibo Song, Huafu Pei
Summary: This study developed an improved nonlinear softening model to describe the thermomechanical response of energy piles and proposed a nonlinear load-transfer approach. The effectiveness of the proposed methods was validated through experiments and comparisons with other numerical methods. A parametric study was also conducted to assess the effects of various parameters on the thermomechanical behavior of energy piles in the case of softening.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2022)
Article
Chemistry, Physical
Siqi Zhang, Huafu Pei, Michael Plotze, Haochen Ying
Summary: Accurate prediction of hydraulic conductivity in soils is crucial for evaluating pollutant transport and designing radioactive waste disposal. Previous research focused on macroscopic seepage behavior, neglecting the microscopic seepage behavior, leading to discrepancy between predictions and measurements. This paper uses molecular dynamics simulations to investigate water flow characteristics in soil mesopores and develops a modified Kozeny-Carman equation based on the results. The proposed equation shows better performance in predicting hydraulic conductivity of clays compared to the classical equation.
APPLIED CLAY SCIENCE
(2022)
Article
Computer Science, Interdisciplinary Applications
Penglin Li, Jian-Hua Yin, Zhen-Yu Yin, Zejian Chen
Summary: This paper develops a one-dimensional finite strain consolidation model to consider the creep characteristics of soft clay during the self-weight consolidation process. The model considers Darcian and non-Darcian flow, nonlinear compressibility and permeability of soft clays with varying water content. The simulation results of three case studies show that the model can capture the self-weight consolidation process well with more realistic consideration of the creep feature of clays compared to previous models.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Geological
Ze-Jian Chen, Wei-Qiang Feng, Jian-Hua Yin, Xiu-Song Shi
Summary: This study developed a fully coupled finite element (FE) model and a simplified Hypothesis B method for predicting the long-term deformation of natural soft soils under embankments. The FE simulations showed good agreement with measured data, and the parametric studies indicated significant contributions to the accuracy of simulations from using averaged soil indices and updating static pore pressure. The improved simplified Hypothesis B method provided settlement results that closely matched the FE simulation results and measured data.
Article
Engineering, Environmental
An Li, Wen-Bo Chen, Ze-Jian Chen, Pei-Chen Wu, Jian-Hua Yin, Chao Zhou
Summary: A large amount of bentonite slurry is dumped as construction waste and it is important to determine the mechanical and hydraulic parameters of bentonite-soil mixtures for reuse. Existing correlations for estimating compression and swelling indices are not suitable for bentonite-soil mixtures dominated by montmorillonite. This study presents test results and correlations for mechanical and hydraulic parameters, as well as a simplified model for estimating hydraulic conductivity.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2023)
Article
Computer Science, Interdisciplinary Applications
Rui Liang, Zhen-Yu Yin, Jian-Hua Yin, Pei-Chen Wu
Summary: This study investigates the effect of soil creep on the long-term development of negative skin friction (NSF) using numerical analysis. The findings reveal that a high creep coefficient of the soil leads to an increase in NSF and a descending trend of the neutral plane (NP) position. The NP position shows drastic variation at the beginning of consolidation when considering creep. Additionally, an exponential prediction model is proposed to reflect the time dependence of the NP location.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Geological
Ze-Jian Chen, Jian-Hua Yin
Summary: Temperature has a significant impact on the mechanical properties of geomaterials, especially the creep behavior of soft clayey soils. Therefore, it is necessary to have an appropriate constitutive model that can describe the time-dependent stress-strain behavior of clayey soils at different temperatures. This study conducted temperature-controlled oedometer tests on two clayey soils and developed a novel 1D thermal elastic viscoplastic model based on an existing 1D elasto viscoplastic model. The proposed model considers three state variables (effective stress, strain, and temperature) to describe the viscoplastic strain rate of soils and can be conveniently implemented in creep analysis.
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(2023)
Article
Engineering, Geological
Ding-Bao Song, Zhen-Yu Yin, Peng-Lin Li, Jian-Hua Yin
Summary: Spatial variability of engineering properties is common in soil layers due to natural characteristic heterogeneity. However, few studies have considered the changes in soil properties during consolidation and large strains in long-term analysis of soft soils. A 1-D consolidation model, called EVPC, fully coupled with elastic viscoplastic constitutive model, incorporates the idea of 'equivalent time' to account for large strain, soil self-weight, compressibility, permeability, and creep. The model's effectiveness and accuracy are verified through comparison with finite element simulations and oedometer tests, and it is further applied to estimate the settlement and excess pore pressure distribution of a clay layer from a field test.
Article
Engineering, Geological
Jian-Hua Yin, Ze-Jian Chen, Wei-Qiang Feng
Summary: This paper proposes and verifies a simplified method for calculating consolidation settlements of viscous clayey soils with vertical drains under complicated loading conditions. The method uses a new logarithmic function, suitable for cases of zero or very small initial effective stress, and the calculated settlements are in good agreement with finite element method (FEM) results and measured data.
