A5069827564- Optical measurement and interference techniques
- Structural Health Monitoring Techniques
- Advanced Fiber Optic Sensors
- Advanced Measurement and Metrology Techniques
- Geotechnical Engineering and Underground Structures
- Ultrasonics and Acoustic Wave Propagation
- Optical Systems and Laser Technology
- Rock Mechanics and Modeling
- Dynamics and Control of Mechanical Systems
- Geoscience and Mining Technology
- Geotechnical Engineering and Soil Stabilization
- Geotechnical Engineering and Soil Mechanics
- Advanced Vision and Imaging
- Infrastructure Maintenance and Monitoring
- Photonic and Optical Devices
- Tunneling and Rock Mechanics
- Advanced Measurement and Detection Methods
- Image Processing Techniques and Applications
- Geomechanics and Mining Engineering
- Retinal and Macular Surgery
- Mechatronics Education and Applications
- BIM and Construction Integration
- Optical Coherence Tomography Applications
- Sulfur-Based Synthesis Techniques
- Semiconductor Lasers and Optical Devices
China South Industries Group (China)
2019-2024
Xi'an Jiaotong University
2011-2024
Shanghai University of Sport
2024
Tianjin Chengjian University
2024
Liaocheng University
2024
Jiangsu Provincial Water Survey & Design Institute (China)
2018-2023
Nanjing Forestry University
2023
Virginia Commonwealth University
2022
Institute of Physics
2021
Hohai University
2014-2020
Abstract Structural health monitoring (SHM) is crucial for ensuring the safety and longevity of concrete structures. Despite widespread use piezoelectric materials like Lead Zirconate Titanate (PZT) monitoring, effects PZT patch size, shape, placement on sensor performance have not been thoroughly examined. This study aims to fill this gap by investigating how these factors influence sensitivity accuracy sensors in monitoring. The signal amplitude-frequency relationship variations dimensions...
A new method combining an embedded smart aggregate and surface mounted piezoceramic patches is introduced for health monitoring of concrete structures. The in a beam as actuator (or transmitter), are attached on the sensors. Two tests using conducted. first test investigates sensitivity recorded signal amplitude-frequency relation patches. To explain significant amplitude fluctuations results, possibility resonance occurring certain frequency range verified through finite element modeling....
Segment design and composition is a vital procedure for controlling the deviations between segment rings designed tunnel axis (DTA) to guarantee quality in stage. The novel technology known as building information modeling (BIM) has been proved have great potential make up shortcomings of traditional methods. This paper proposes new approach address challenges connected with implementing using BIM technology, well enabling automatic generation model. An integrated framework presented, which...
An experimental study on the shear strength development of cement‐sand‐gravel (CSG) material was carried out using triaxial compression tests. The effects cementing agent content, aggregate and gradation CSG were analyzed. remarkably increased with increasing content for a given confining pressure. increase in far exceeded that content. However, stress‐strain curves changed only slightly when adjusted. Based test data, criterion is proposed as function gradation.
The subject of this investigation is a new method for the construction sulfonylated heterocycles which overcomes limitations classical approaches using cheap feedstock sulfonylating agent, especially under photocatalyst- and metal-free conditions.
In response to the issues of relatively low image contrast, blurry boundaries infrared small targets, and various environmental noise interferences in thermal imaging systems, resulting reduced target recognition rates tracking effectiveness. This paper proposes an algorithm based on fuzzy comprehensive assessment. Built upon sequences captured by on-board imager, employs grayscale processing, neighborhood mean filtering, second-order difference method filter enhance images. process improves...
A method combining the spatial and temporal fringe analysis techniques is proposed to extract phase from shadow moiré interferogram with random shift. The first determines grating translation difference based on spiral transform technique. Then initial shift estimated. After that a generalized iterative least-squares developed retrieve accurate map using three frames. relaxes restriction calibration between frames provides stable correct convergence in fast way. Simulation experiment...
We proposed a general algorithm for phase-shifting shadow moiré by an iterative self-tuning algorithm. In our system, the grating is translated in equal distance to introduce phase shifts across field of view. The produces accurate information with five interferograms and can calibrate precise step during process height demodulation. Compared traditional method, insensitive dependent effects, which main systematic source error phase-shift when reconstructing surfaces from fringe patterns....
A wide range fiber optic sensor system for displacement and crack monitoring is developed. In the proposed system, a number of loops are formed from single each loop used as or sensor. The feasibility dynamic developed in this manner investigated experimentally. Both glass fibers plastic experiments. Experimental results show that new has (maximum 88 mm) also high sensitivity when an appropriate diameter selected Moreover, method very simple low cost, so situ application potential high.
Lean cemented sand and gravel (LCSG) materials are subjected to unloading‐loading when an LCSG dam is opened for water drainage then refilled or a roadbed base repeated wheel loads. To investigate the behavior of under loading‐unloading, previous studies utilized complete loading triaxial test. In contrast, in this study, consolidated drained tests unloading reloading paths with cementing agent contents 60 100 kg/m 3 different confining pressures, which each curve generates three...
The extreme value of interference (EVI) algorithm is a very fast and efficient method for the fringe pattern phase demodulation. It requires only two arbitrarily phase-shifted frames in which shift between interferograms can be determined by searching maximum minimum normalized patterns, then measured obtained an arctangent function. Compared with other two-frame demodulation algorithms, EVI has great advantages. Firstly, simple calculation speed fast. Secondly more importantly, it works...
The measurement accuracy of phase shifting shadow moiré is affected by both the spatially nonuniform shift error and random error. Substantial work has been done to overcome this difficulty, but few works can deal with two sources simultaneously. In presented paper, we describe a solution that compensate for at same time. our method, binocular stereovision system integrated into configuration calibrate setting parameters. Thus, precise setup built. Then, developed an iterative least-squares...
It is widely accepted that plastic optical fibers will have broad application prospect in the field of structural health monitoring because fiber not easy to break like silica and it also has excellent characteristics such as large diameter, good toughness, high plasticity low cost. In order monitor location, width direction cracks concrete dam, quantitative crack method dam based on POF-OTDR studied theoretically experimentally. Firstly, mathmatical model established through a lot tests....
Transport of Intensity Equation (TIE) is a simple and efficient method for phase retrieval by solving the equation between intensity axial derivative phase. In this method, estimation very crucial. Simply, we use two defocused images to estimate finite difference method. However, result still unsatisfactory even though optimal distance adopted. The reason lies in that intensity's change not linear propagation light. Simply using will ignore higher order derivatives. other words, contain...
Analysis on the actual crack behavior is of important significance to evaluate safety concrete dam. In this paper, mainly based research status cracks dam, unit root analysis method dam proposed monitoring data and autoregression model, aiming enrich methods deepen understanding Firstly, feasibility analyzing residual sequence opening displacement model discussed. Next, basic principle elaborated established by studying prior conditions parameter estimation as well determination criteria...
A mechanism has been developed to achieve rapid deployment of longitudinally folding wings by utilizing compound actuation from the firing powder and compressive spring. theoretical model based on rigid-body dynamics was first proposed study characteristics longitudinal under compound-driven effects. Subsequently, experiments were conducted using a prototype validate model. It observed that are deployed in 11 ms. Further parametric analysis indicates mass both propellant locking rod positive...
Background: Glycerol, sucrose, lactose, glucose, and fructose are important biomarkers in human sweat because their contents can reflect physiological status health conditions. It is of high importance to determine them for monitoring, disease diagnosis, physical training, etc. Aim: The aim this work develop a method based on capillary electrophoresis amperometric detection the simultaneous determination glycerol carbohydrates sweat. Objective: A electrophoretic pipette-tip-based electrodes...