Article
Construction & Building Technology
Sangwook Park, Jong Won Ma
Summary: This study presents a model for structural monitoring of building structures using Terrestrial Laser Scanning (TLS). The model includes data collection, processing, and structural assessment phases, and utilizes voxel-based data processing approach with polynomial regression to estimate structural responses. The results show that the model has reasonable accuracy, particularly at higher drift levels.
JOURNAL OF BUILDING ENGINEERING
(2023)
Review
Engineering, Multidisciplinary
Nan Shen, Bin Wang, Hongyang Ma, Xin Zhao, Yang Zhou, Zhenxin Zhang, Jinghai Xu
Summary: This paper provides a comprehensive overview of the application of terrestrial laser scanning (TLS) in deformation monitoring. It covers measurement principles, stochastic models, registration, change detection, and practical applications. The paper classifies, details, and compares methods for change detection, registration, and georeferencing, and discusses the challenges and future research directions in deformation monitoring. The importance of measurement planning for data accuracy and decision-making is emphasized.
Article
Remote Sensing
Martin Mokros, Tomas Mikita, Arunima Singh, Julian Tomastik, Juliana Chuda, Piotr Wezyk, Karel Kuzelka, Peter Surovy, Martin Klimanek, Karolina Zieba-Kulawik, Rogerio Bobrowski, Xinlian Liang
Summary: The development of devices capable of generating 3D point clouds of the forest has flourished in recent years. Low-cost technologies such as MultiCam, iPad Pro, GeoSlam Horizon, and FARO Focus s70 were compared for tree detection and diameter at breast height estimation. Results showed that TLS provided the most accurate data, while iPad Pro achieved results closest to TLS when DBH > 7 cm.
INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION
(2021)
Article
Optics
Ashraf A. A. Beshr, Hossam El-Din Fawzy, Ehab A. A. Eldin, Jong Wan Hu, Fathi A. Abdelmgeed
Summary: This paper introduces the application of digital measuring techniques, specifically Digital Close Range Photogrammetry (DCRP), in the detection of deformation in post-tensioned structural elements (PTSEs). The use of digital equipment and a terrestrial laser scanner (TLS) allows for highly accurate monitoring of PTSE camber, with deviations not exceeding 0.01 mm.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Chemistry, Analytical
Michael Bekele Maru, Donghwan Lee, Kassahun Demissie Tola, Seunghee Park
Summary: This study compared the performance of optical sensors (depth camera and terrestrial laser scanner) in estimating structural deflection. Bilateral filtering techniques were used to enhance the accuracy of point cloud data and increase the prospects of sensor application in structural health monitoring. Results showed that data obtained from TLS were better than those obtained from DC.
Article
Environmental Sciences
Dongfeng Jia, Weiping Zhang, Yanping Liu
Summary: This study presents a systematic method for analyzing tunnel deformation, including a rapid and high-accuracy point-cloud registration method using a positioning base made in the laboratory and an improved moving least-squares method for reconstructing the tunnel centerline from unorganized point clouds.
Article
Construction & Building Technology
Wenxiao Sun, Jian Wang, Fengxiang Jin, Guoyuan Li, Fubin Xu
Summary: In this study, an intelligent construction monitoring method for large and complex steel structures based on laser point cloud is proposed. The method employs three-dimensional laser scanning technology to capture accurate and complete spatial information, converts the building information model (BIM) into a point cloud model, and achieves data consistency between the two types of point clouds. By extracting spatial information and analyzing distance deviation, the method provides accurate data sources for the intelligent construction of steel structures.
Article
Remote Sensing
Daniel Kuekenbrink, Mauro Marty, Ruedi Boesch, Christian Ginzler
Summary: This study evaluates the performance of different close-range remote sensing devices for tree detection and diameter at breast height (DBH) extraction in forests. The results show that terrestrial laser scanning systems (TLS) have the highest tree detection rate, while drone-based laser scanning systems (UAVLS) have the lowest tree detection rate. The novel GoPro approach performs moderately well in tree detection and is comparable to LiDAR devices in DBH extraction.
INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION
(2022)
Article
Materials Science, Multidisciplinary
Xiangyang Xu, Peixin Shi, Xiaoqi Zhou, Wei Liu, Hao Yang, Tong Wang, Minjun Yan, Wenbin Fan
Summary: Automation and intelligent health monitoring technologies are important for the development of rail transit operation and maintenance. The paper proposes a novel visual measurement technology for deformation monitoring of tunnel structures, which shows good potential for practical applications in terms of resolution and accuracy.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Construction & Building Technology
Yun-Jian Cheng, Wan-Lan Zheng, Wen-Ge Qiu
Summary: This paper introduces a methodology for automatically segmenting and reconstructing tunnel lining rebars, which has been validated through an experiment. The results show high accuracy in segmentation and millimeter-level precision in rebar modeling.
STRUCTURAL CONCRETE
(2023)
Article
Construction & Building Technology
Yun-Jian Cheng, Wan-Lan Zheng, Wen-Ge Qiu
Summary: This paper aims to develop a methodology that can automatically segment the semantics and instances of curved rebars and reconstruct the tunnel lining rebars from raw point clouds. The proposed methodology includes reshaping, extraction and refinement, semantic segmentation, instance labeling, and modeling of rebar meshes. The results show that the rebar segmentation has high precision values with acceptable recall values, and the reconstructed rebar models achieve millimeter-level accuracy (about 2 mm).
STRUCTURAL CONCRETE
(2023)
Article
Engineering, Civil
Thomas Sanchez, David Conciatori, Mahdi Ben-Ftima, Bruno Massicotte
Summary: Laser scanning is a potential technique for structural inspection, but its cost hinders its widespread use. This paper proposes an easy-to-use method for monitoring the behavior of structures and demonstrates its accuracy and feasibility on large structures through case studies.
STRUCTURE AND INFRASTRUCTURE ENGINEERING
(2022)
Article
Engineering, Environmental
Yunchuan Wang, Ping Duan, Jia LI, Zhike Zhang
Summary: A side-slope monitoring method that integrates terrestrial laser scanning and unmanned aerial vehicle-based photogrammetry point clouds is proposed to solve the problem of slope monitoring in complex scenes. The experimental results show that this method can effectively monitor the deformation of the side slope.
ENVIRONMENTAL & ENGINEERING GEOSCIENCE
(2023)
Article
Geography, Physical
Junling Jin, Jeffrey Verbeurgt, Lars De Sloover, Cornelis Stal, Greet Deruyter, Anne-Lise Montreuil, Sander Vos, Philippe De Maeyer, Alain De Wulf
Summary: In this study, a new remote sensing method using a long-range static terrestrial laser scanner (TLS) was investigated for monitoring the spatio-temporal variation in surface moisture on a sandy beach. A new intensity correction method was proposed to model the relation between beach surface moisture and corrected intensity. The results showed that the long-range static TLS is an extremely suitable technique for monitoring surface moisture dynamics over a substantial beach section at a high scanning frequency.
ISPRS JOURNAL OF PHOTOGRAMMETRY AND REMOTE SENSING
(2021)
Article
Materials Science, Multidisciplinary
Hao Yang, Xuhui He, Xiangyang Xu, Xiaojun Wei, Youwu Wang
Summary: This paper investigates intrusion detection of tunnels and trains based on laser scanning technology, proposing a feature-based registration method. Intrusion analysis is achieved through convex points, generating a complete and comprehensive image for design and decision-making support.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Mechanics
Rawan Aqel, Patrick Severson, Rani Elhajjar
Summary: A novel core splice joint configuration for composite sandwich structures is studied and proposed to improve the strength and toughness. Experimental and numerical efforts show that this configuration can significantly increase the ultimate strength by 13% to 51% and the toughness by 2% to 35%.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Xianheng Wang, Cong Chen, Jinsong Zhang, Xinming Qiu
Summary: In this paper, a new form-finding method based on spatial elastica model (FMSE) is proposed for elastic gridshells. The method integrates the deformations of elastic rods into the overall deformation of the gridshell, and solves a set of transcendental equations using the quasi-Newton method to ensure the deformation satisfies the given boundary conditions. The method is validated through experiments and expected to have potential applications in the investigations of elastic gridshells.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Hao Huang, Zitong Guo, Zhongde Shan, Zheng Sun, Jianhua Liu, Dong Wang, Wang Wang, Jiale Liu, Chenchen Tan
Summary: The conventional evaluation of 3D braided composites' mechanical properties through numerical and experimental methodologies hinders material application due to the expenses, time constraints, and laborious efforts involved. This study establishes a multi-scale finite element model and a surrogate model for predicting the elastic properties of 3D4D rotary braided composites with voids. By optimizing a neural network model, the results are validated and provide valuable insights into the microstructure and properties of these composites.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Xinyu Li, Hao Zhang, Haiyang Yang, Junrong Luo, Zhongmin Xiao, Hongshuai Lei
Summary: Due to their excellent mechanical properties and design flexibility, fluted-core composite sandwich structures have gained significant attention in aerospace and rail transit applications. This study investigated the free-vibration characteristics and optimized design of composite fluted-core sandwich cylinders through theoretical models and experimental tests.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Chao Li, Chunzheng Duan, Xiaodong Tian, Chao Wang
Summary: A mechanistic model considering the bottom edge cutting effect and the anisotropic characteristics of the material is proposed in this paper to accurately predict cutting forces. The model was validated through a series of milling experiments and can be used to predict the cutting force of various parts of the cutter and any feed direction.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Camila Sanches Schimidt, Leopoldo Pisanelli Rodrigues de Oliveira, Carlos De Marqui Jr
Summary: This work investigates the vibro-acoustic performance of graded piezoelectric metamaterial plates. The study shows that piezoelectric metamaterial plates with reconfigurable properties can provide enhanced vibration and sound power attenuation.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Jun Ke, Li-jie Liu, Zhen-yu Wu, Zhong-ping Le, Luo Bao, Dong-wei Luo
Summary: Compared with other green natural fibers, ramie has higher mechanical properties and lower cost. In this study, ramie and glass fiber are made into composite circular tubes. The results show that the hybrid circular tube with ramie and glass fiber has improved torsional mechanical properties and reduced weight and cost. The failure mechanisms are affected by the loading direction and the content of each fiber.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Natalia Pingaro, Gabriele Milani
Summary: This paper proposes an enhanced analytical model for predicting the behavior of FRCM samples tested under standard tensile tests. The model takes into account the interaction between fibers and matrix through the interface, and assumes different material properties at different phases. By solving a second order linear differential equation, an analytical solution can be obtained. The model is validated with experimental data and shows good predictability.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Jialiang Fan, Anastasios P. Vassilopoulos, Veronique Michaud
Summary: This article investigates the effects of voids, joint geometry, and test conditions on the fracture performance of thick adhesive Double Cantilever Beam (DCB) joints. It concludes that grooved DCB joints with low void content tested at low displacement rates showed stable crack propagation without significant crack path deviation.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Auwalu I. Mohammed, Kaarthikeyan Raghupathy, Osvaldo De Victoria Garcia Baltazar, Lawson Onokpasah, Roger Carvalho, Anders Mogensen, Farzaneh Hassani, James Njuguna
Summary: This study investigates the performance of composite pressure vessels under damaged and undamaged conditions, providing insights into their reliability and residual strength capabilities. The results demonstrate that the damage profile and its effect on compressive strength are similar between damaged and non-damaged cylinders. When subjected to quasi-static compression, the polyethylene liner absorbs enough elastic strain energy to recover without plastic deformation. Additionally, quasi-static compression has little to no influence on the axial strength of the cylinders. The damage characterization reveals fiber breakage, delamination, local buckling, and brooming failure. This study has direct implications for the safety design tolerances, manufacturing strategies, and operational failure conditions of composite overwrapped pressure vessels (COPVs).
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Muhammad Irfan Shirazi, Samir Khatir, Djilali Boutchicha, Magd Abdel Wahab
Summary: Structural health monitoring is important to ensure the safety of components and structures. This study proposes a method using finite element models and 1D-CNN network to extract and classify vibration responses for crack detection. The results show that the proposed approach is effective in real-time damage detection.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Maryam Mirsalehi, Kiarash Kianpour, Sharif Shahbeyk, Mohammad Bakhshi
Summary: This study comprehensively investigates the one-way response of 3D-woven sandwich panels (3DWSPs) and their interfering parameters, providing interpretation of elastic and failure results, failure maps, and reliable theoretical models for linear elastic response and observed failure mechanisms.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Yiming Zhao, Zhonggang Wang, Zhigang Yang, Bin Qin
Summary: The paper proposes a Ritz and statistical energy analysis (Ritz SEA) hybrid method for calculating rectangular plate acoustic vibration coupling in the mid-frequency range. This method combines the fast convergence and ability to handle arbitrary boundary conditions of the Ritz method with the power flow equation of the statistical energy analysis method. The results show that this approach effectively filters out random fluctuations in mid-frequency domains while demonstrating exceptional stability and precision.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Joao Henrique Fonseca, Woojung Jang, Dosuck Han, Naksoo Kim, Hyungyil Lee
Summary: This study addresses the enhancement of an injection-molded fiber-reinforced plastic / metal hybrid automotive structure and its plastic injection molding process through the integration of the finite element method, artificial intelligence, and evolutionary search methods. Experimental validation of finite element models, the generation of a database through orthogonal array and Latin hypercube methods, and the training of artificial neural networks are conducted. The genetic optimization algorithm is then applied to identify optimal process parameters. The results show significant reduction in product warpage and manufacturing time while maintaining structural strength, contributing to the advancement of composite automotive structures with superior quality.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Alessandro Vescovini, Carina Xiaochen Li, Javier Paz Mendez, Bo Cheng Jin, Andrea Manes, Chiara Bisagni
Summary: This paper presents a study on six single-stringer specimens manufactured using the card-sliding technique with non-crimp fabrics and adopting a Double-Double (DD) stacking sequence. The specimens were tested under compression loading conditions to investigate post-buckling and failure in aerospace structures. Experimental results and numerical simulations were compared to analyze the behavior and failure modes of the specimens. The study found promising evidence of a viable solution to optimize aeronautical structures and enhance resistance to skin-stringer separation, particularly with the use of tapered flanges.
COMPOSITE STRUCTURES
(2024)