Journal articles: '3D-structural model'

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Lamarche, Juliette, and Magdalena Scheck-Wenderoth. "3D structural model of the Polish Basin." Tectonophysics 397, no. 1-2 (March 2005): 73–91. http://dx.doi.org/10.1016/j.tecto.2004.10.013.

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Arndt, Dirk, Kristian Bär, Johann-Gerhard Fritsche, Ingo Sass, and Andreas Hoppe. "3D structural model of the Federal State of Hesse (Germany) for geopotential evaluation." Zeitschrift der Deutschen Gesellschaft für Geowissenschaften 162, no. 4 (December 1, 2011): 353–69. http://dx.doi.org/10.1127/1860-1804/2011/0162-0353.

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Cook, Douglas, Pradeep George, and Margaret Julias. "2D/3D hybrid structural model of vocal folds." Journal of Biomechanics 45, no. 2 (January 2012): 269–74. http://dx.doi.org/10.1016/j.jbiomech.2011.10.030.

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Budko, Тatiana, and Lyudmila Lavrinenko2. "Structural Analysis and 3D Timber Spatial Structure Modeling." Building constructions. Theory and Practice, no. 8 (November 29, 2021): 4–16. http://dx.doi.org/10.32347/2522-4182.8.2021.4-16.

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The analysis of the structural form of the multi-volume dome structure using load-bearing wooden arches is performed. The complexity of the volumes and their connecting lines, as well as the requirement to conduct a non-linear analysis of long-span wooden elements at the request of Eurocode 5 make the information model necessary. It is noted that the design using this technology is developing in the direction of taking into account all stages of the structure life cycle. Information modeling of wooden structures in the world is the most prepared for the use of BIM-technologies. This is due to the sophisticated digital technologies for the production of modern wooden structures elements. An information model was formed for designing according to the regulations of Ukraine. The Information Model was created in the SAPFIR software package for further possibility of importing the model into the LIRA-CAD software package. The necessary auxiliary steps were used to build the model. The loads on the curved surface were calculated in the PC Espri. For further development of the nodes, 3D-modeling was used with the transfer of the information model into the PC Tekla Structures as a specialized environment for the constructive section of the project. The presented analysis of the complex dome structure using wooden arches summarizes the approaches to the development of unique forms of structures using wood. The use of information models has significantly increased the complexity of architectural design and structural model taking into account the nonlinear effects of wood. The possibility of integrating these tools for further implementation in BIM-technology is shown.

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Román-González, Sergio A., Edson Edinho Robles-Gómez, Jorge Reyes, Johanna Bernáldez, Fernando Cortés-Guzmán, Karina Martínez-Mayorga, Fernando Lazcano-Pérez, Alexei Licea, and Roberto Arreguín-Espinosa. "A 3D structural model of RsXXVIA, an ω-conotoxin." Structural Chemistry 28, no. 4 (November 22, 2016): 901–9. http://dx.doi.org/10.1007/s11224-016-0877-8.

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Sarlikioti, V., L. F. M. Marcelis, and P. H. B. de Visser. "TOWARDS A 3D STRUCTURAL TOMATO MODEL FOR CALCULATING LIGHT INTERCEPTION." Acta Horticulturae, no. 893 (April 2011): 721–28. http://dx.doi.org/10.17660/actahortic.2011.893.77.

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Miki, Tomohiro, and Junichiro Niwa. "Nonlinear Analysis of RC Structural Members Using 3D Lattice Model." Journal of Advanced Concrete Technology 2, no. 3 (2004): 343–58. http://dx.doi.org/10.3151/jact.2.343.

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Pepe, Massimiliano, Domenica Costantino, and Alfredo Restuccia Garofalo. "An Efficient Pipeline to Obtain 3D Model for HBIM and Structural Analysis Purposes from 3D Point Clouds." Applied Sciences 10, no. 4 (February 12, 2020): 1235. http://dx.doi.org/10.3390/app10041235.

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The aim of this work is to identify an efficient pipeline in order to build HBIM (heritage building information modelling) and create digital models to be used in structural analysis. To build accurate 3D models it is first necessary to perform a geomatics survey. This means performing a survey with active or passive sensors and, subsequently, accomplishing adequate post-processing of the data. In this way, it is possible to obtain a 3D point cloud of the structure under investigation. The next step, known as “scan-to-BIM (building information modelling)”, has led to the creation of an appropriate methodology that involved the use of Rhinoceros software and a few tools developed within this environment. Once the 3D model is obtained, the last step is the implementation of the structure in FEM (finite element method) and/or in HBIM software. In this paper, two case studies involving structures belonging to the cultural heritage (CH) environment are analysed: a historical church and a masonry bridge. In particular, for both case studies, the different phases were described involving the construction of the point cloud and, subsequently, the construction of a 3D model. This model is suitable both for structural analysis and for the parameterization of rheological and geometric information of each single element of the structure.

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Wu, Xinming. "Building 3D subsurface models conforming to seismic structural and stratigraphic features." GEOPHYSICS 82, no. 3 (May 1, 2017): IM21—IM30. http://dx.doi.org/10.1190/geo2016-0255.1.

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Subsurface modeling from seismic and borehole data is important for reservoir prediction, geophysical exploration, and production. A reasonable model should honor borehole rock properties and conform to seismic structural and stratigraphic features. Such a subsurface model can be difficult to build in cases complicated by faults and unconformities. Automatic and semiautomatic methods have been proposed to build subsurface models from seismic and borehole data; however, seismic structural and stratigraphic features and borehole measurements are not fully used in most methods. I have developed a workflow to fully use seismic and borehole data to build subsurface models that honor borehole measurements and conform to seismic horizons, faults, unconformities, and stratigraphic features such as channels. In this workflow, I first automatically remove the faulting and folding in seismic and borehole data and map them into an unfaulted and flattened space, in which seismic reflectors and borehole measurements corresponding to the same geologic layers are horizontally aligned. I then build a subsurface model in this unfaulted and flattened space by computing a sequence of 2D horizontal interpolations of borehole data. Each horizontal interpolation is guided by the stratigraphic features apparent in the corresponding horizontal seismic slice, so that the interpolant conforms to the seismic stratigraphic features. I finally map the interpolated model back into the input space and obtain a subsurface model that honors the seismic and borehole data. I demonstrate the proposed workflow using synthetic and real examples complicated by faults and unconformities.

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Parkinson, Ian H., Danielle Forbes, Peter Sutton-Smith, and Nicola L. Fazzalari. "Model-Independent 3D Descriptors of Vertebral Cancellous Bone Architecture." Journal of Osteoporosis 2010 (2010): 1–6. http://dx.doi.org/10.4061/2010/641578.

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High-resolution micro computed tomography has enabled measurement of bone architecture derived from 3D representations of cancellous bone. Twenty-eight vertebral bodies were obtained from four embalmed male cadavers. From 3D anaglyphs, trabecular rod thickness and length were measured and the trabecular rod Buckling index was calculated. From 3D voxel-based datasets, bone volume density, trabecular thickness, and trabecular separation were measured. Also, trabecular bone pattern factor, structural model index, connectivity density, and degree of anisotropy were calculated. Bone volume density alone explains 59% of the variability in trabecular rod Buckling index. The addition of connectivity density, trabecular separation, and structural model index, in a multiple regression statistical model, improves the explanatory power to 77%. The relationships between measures of cancellous bone architecture and a derived measure of trabecular rod strength were investigated. Morphological descriptors of cancellous bone provide a composite explanatory model of trabecular rod strength.

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García, Juan, Blanca Quintana, Antonio Adán, Víctor Pérez, and Francisco J. Castilla. "3D-TTA: A Software Tool for Analyzing 3D Temporal Thermal Models of Buildings." Remote Sensing 12, no. 14 (July 14, 2020): 2250. http://dx.doi.org/10.3390/rs12142250.

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Many software packages are designed to process 3D geometric data, although very few are designed to deal with 3D thermal models of buildings over time. The software 3D Temporal Thermal Analysis (3D-TTA) has been created in order to visualize, explore and analyze these 3D thermal models. 3D-TTA is composed of three modules. In the first module, the temperature of any part of the building can be explored in a 3D visual framework. The user can also conduct separate analyses of structural elements, such as walls, ceilings and floors. The second module evaluates the thermal evolution of the building over time. A multi-temporal 3D thermal model, composed of a set of thermal models taken at different times, is handled here. The third module incorporates several assessment tools, such as the identification of representative thermal regions on structural elements and the comparison between real and simulated (i.e., obtained from energy simulation tools) thermal models. The potential scope of this software and its applications within the field of energy efficiency are presented in various case studies at the end of the paper.

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Han, Siyu, Linsheng Huo, Yize Wang, Jing Zhou, and Hongnan Li. "Rapid Reconstruction of 3D Structural Model Based on Interactive Graph Cuts." Buildings 12, no. 1 (December 29, 2021): 22. http://dx.doi.org/10.3390/buildings12010022.

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The image-based 3D reconstruction technique has been applied in many scenarios of civil engineering, such as earthquake prevention and disaster reduction, construction monitoring, and intelligent city construction. However, the traditional technique is time-consuming, and the modeling efficiency has become a bottleneck limiting its application in emergency scenarios. In this paper, a rapid reconstruction method is proposed which combines the traditional image-based 3D reconstruction technique and an interactive graph cuts algorithm. Firstly, a sequence of images is collected around the target structure. Then, the images are preprocessed using the interactive iterative graph cuts algorithm to extract the target from each image. Finally, the resulting sequence of images is used to perform the 3D reconstruction. During the preprocessing, only a few images require manual intervention while the rest can be processed automatically. To verify the modeling accuracy of the proposed method, a column that has been destroyed is selected as a target for 3D reconstruction. The results show that compared with the traditional method, the modeling efficiency of the fast reconstruction method is doubled. In addition, the modeling accuracy is 97.65%, which is comparable to the modeling accuracy of the traditional method (97.73%); as well, by comparing the point clouds, the alignment between the two models is tremendously close, with tiny difference. The proposed rapid reconstruction method can be applied in emergency scenarios, such as rapid assessment in post-disaster situations.

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Robert, Philippe A., Theinmozhi Arulraj, and Michael Meyer-Hermann. "Ymir: A 3D structural affinity model for multi-epitope vaccine simulations." iScience 24, no. 9 (September 2021): 102979. http://dx.doi.org/10.1016/j.isci.2021.102979.

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Sung Hwan Chun, 서정근, and Yoo-Joo Choi. "Structural Similarity Evaluation between Proteins Based on 3D Model Shape Analysis." Journal of Knowledge Information Technology and Systems 13, no. 1 (February 2018): 87–103. http://dx.doi.org/10.34163/jkits.2018.13.1.009.

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Xie, Xiang-Qun, Jian-Zhong Chen, and Eric M. Billings. "3D structural model of the G-protein-coupled cannabinoid CB2 receptor." Proteins: Structure, Function, and Genetics 53, no. 2 (September 24, 2003): 307–19. http://dx.doi.org/10.1002/prot.10511.

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Moreira, Anderson Camargo, Ricardo Leo Marques Rouxinol, Pedro Alvim de Azevedo Santos, Celso Peres Fernandes, Alexandre Antunes Ribeiro, Roseli Marins Balestra, and Marize Varella. "Three-Dimensional Stochastic Modeling and X-Ray Microtomography Applied to Titanium Scaffolds: A Comparative Approach." Materials Science Forum 727-728 (August 2012): 67–72. http://dx.doi.org/10.4028/www.scientific.net/msf.727-728.67.

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The performance of biomaterial scaffolds for bone tissue engineering, as porous titanium implants, is strongly dependent of its structural features. A reliable structural characterization of this kind of implant is very important. The most of image analysis techniques just supplies 2D information about the structure of specimens. X-ray microtomography is imaging technique that can produce 3D images of samples, however, stochastic models can also estimate properties of porous materials in 3D. This work presents the evaluation of a 3D model (using a truncated Gaussian method) in comparison to 3D microtomography volume, both from a titanium scaffold sample. In order to compare, geometrical parameters were measured for both 3D volumes. By the results, the truncated Gaussian 3D method reproduced a model with similar values to the microtomography volume, showing a good agreement among data, which suggests the use of this technique to estimate physical parameters of titanium scaffolds

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Wang, B. T., P. H. Chen, and R. L. Chen. "Finite Element Model Verification for the Use of Piezoelectric Sensor in Structural Modal Analysis." Journal of Mechanics 22, no. 2 (June 2006): 107–14. http://dx.doi.org/10.1017/s1727719100004408.

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AbstractThis paper presents the theoretical modal analysis for the use of PVDF sensor in structural modal testing via finite element analysis (FEA). A series of rectangular PVDF films are adhered on the surface of cantilever beam as sensors, while the point impact force is applied as the actuator for experimental modal analysis (EMA). Natural frequencies and mode shapes determined from both FEA and EMA are validated. In FEA, the beam structure is modeled by 3D solid elements, and the PVDF films are modeled by 3D coupled field piezoelectric elements. Both modal analysis and harmonic response analysis are performed to obtain the structural modal parameters and frequency response functions, respectively. Results show that both FEA and EMA results agree well. In particular, the PVDF sensor mode shapes, proportional to the slope difference between the two edges of PVDF film, are numerically and experimentally validated by FEA and EMA, respectively. Therefore, the simulation of PVDF films for vibration analysis in FEA can be verified and easily extended to other complex structures that may contain piezoelectric materials.

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Yu, Xiao Yu, Xue Li, Xiao Song Li, and Guo Yi Zhang. "The Integrative Establishment of a Three-Dimensional Structure Model of Changling Gas Field in Changling Fault Depression." Applied Mechanics and Materials 556-562 (May 2014): 3779–82. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.3779.

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The three-dimensional (3D) geological modeling technique which is considered as an important skill of fine reservoir description has been gaining more and more attention. On one hand, it can efficiently promote the transformation of reservoir description from two-dimensional (2D) to 3D, and from qualification to quantification as well. The 3D reservoir geological model can be used as basic geological knowledge in terms of adjusting well patterns and indicating remaining oil distribution, through reflecting the spatial distribution characteristics and the variation of the reservoir physical property. On the other hand, the 3D modeling technique specializes in the representation of local micro features in comparison of regular ways. This article aims at subtly describing the structural modeling of Changling gas field of Changling fault depression. The result of this case study shows that the establishment of structural model is consistent with the understanding of fault development which was proved during the process of producing gas, thus the structural model has high reliability. Therefore, the structural model is of great guiding significance for the design of new well and the well patter optimization.

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Hu, Shaopei, Chao Su, Heng Zhang, Enhua Cao, Rongyao Yuan, and Yunquan Xu. "Analysis of Structural Characteristics of Underground Cavern Group by Simulating All Cavern Excavation." Advances in Civil Engineering 2022 (March 25, 2022): 1–16. http://dx.doi.org/10.1155/2022/4610557.

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The traditional Three-dimensional (3D) model for stability analysis of a large underground cavern group only includes the main powerhouse, the main transformer chamber, the tailrace surge tank, the main electrical wire hall, and part of the diversion tunnel and tailwater tunnel. Other caverns excavation are not taken into consideration, which is inconsistent with the actual project. In this study, a 3D Finite Element Method (FEM) model, including all the cavities, and a 3D simplified model containing only part of the cavities were established based on the actual underground cavern group project. We study the structural characteristics of the cavern group during excavation via 3D nonlinear FEM. At the same time, three numerical calculation schemes are designed for comparison. The results show that the simulated distributions of the stress field, deformation field, and plastic zone of the two numerical models are similar, but the magnitudes of the 3D FEM model, which considers all caverns are generally higher than the simplified model. The difference between the two simulated horizontal displacements of the main powerhouse reaches 53.72%. Therefore, from the perspective of engineering safety and actual construction, it is advisable to adopt the 3D FEM model, including all the cavities, when conducting a simulation analysis of the underground cavern group.

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Marjanović, Jelena, Slavenka Petrak, Maja Mahnić Naglić, and Martinia Ira Glogar. "Design and Computer Construction of Structural Sleeve Forms for Women’s Clothing." Textile & leather review 2, no. 4 (December 6, 2019): 183–95. http://dx.doi.org/10.31881/tlr.2019.29.

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The paper presents the research of the development process of a unique women’s clothing collection with complex, structural sleeve forms. Using the 2D/3D CAD systems for computer clothing design, 15 models of women’s clothing with structural sleeve forms were constructed and modeled. Textile patterns were also computer-designed, as a preparation for digital printing on cutting parts of a particular clothing models. The computer clothing design included all the segments of the computer 3D prototype development, with the purpose of investigating the possibilities of modeling and 3D simulations of complex sleeve structures, which in the real manufacturing process require additional fixation of cutting parts. The influence of 3D simulation parameters, in correlation with the applied physical and mechanical properties of textile material, was investigated in order to achieve complex 3D forms of simulated clothing models. Color and textile patterns variations of computer-designed 3D models were developed with the purpose of achieving a realistic visualization of the designed clothing collection. Original prototypes were made for two selected models from the collection, with computer-designed textile patterns applied on a model using digital printing technology.

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Li, Tao, Zian Li, and Jiang Wang. "Study on 3D Fine Structural Modeling of Typical Block in Sanan Oilfield, Daqing." Applied Mechanics and Materials 628 (September 2014): 348–53. http://dx.doi.org/10.4028/www.scientific.net/amm.628.348.

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Sanan oilfield has entered late stage of high water cut development. It urgently needs accurate prediction of remaining oil distribution. But previous studies on 3D structure were far could not meet the requirements of fine reservoir description. This paper applied RMS, a piece of excellent geological modeling software establishing the 3D fine structural model of typical block in Sanan oilfield on the bases of 3D fine seismic structural interpretation data. It included the 28 faults’ model, 11 horizons’ model and the structural model. And then measured and analyzed the faults elements data. Based on abundant geologic data, well data and seismic data of the block, this structural model reproduced the fine seismic interpretation results accurately. It was really fine enough to meet the requirements of the fine reservoir description. This research solved the problem that traditional modeling techniques could not handle complex cutting relationship of faults’ model. It laid a solid foundation for reservoir numerical simulation and remaining oil distribution prediction.

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Cipriany, Benjamin. "Structural Analysis, Before the Failure." EDFA Technical Articles 16, no. 2 (May 1, 2014): 46–47. http://dx.doi.org/10.31399/asm.edfa.2014-2.p046.

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Abstract This column suggests that developing 3D structural models as tools for observing and exploring failures in the virtual domain could prove instrumental in avoiding failure without committing hardware. Likewise, instead of building hardware to systematically evaluate failures in the presence of random effects, virtualization through a 3D model could provide a completely user-defined environment for conducting controlled experiments. In such a virtual environment, systematic and random behaviors can be introduced and parsed to provide greater clarity in the search for root causes of failure.

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Zhang, L., P. Michaleris, and P. Marugabandhu. "Evaluation of Applied Plastic Strain Methods for Welding Distortion Prediction." Journal of Manufacturing Science and Engineering 129, no. 6 (November 20, 2006): 1000–1010. http://dx.doi.org/10.1115/1.2716740.

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Large and complex structures such as ship panels generally have various types of welding-induced distortions including angular deformation, longitudinal bending, and buckling. Developing efficient methodologies for modeling welding distortions and residual stresses of large structures plays a critical role in industrial applications. Conventional transient moving source analyses on three-dimensional (3D) finite element models, where millions of degrees of freedom and thousands of time increments are involved, demonstrate the capability to capture all types of welding distortions, but proved to be computational costly. The 2D to 3D applied plastic strain method, where only longitudinal plastic strain resulting from 2D models is mapped to a 3D structural model, successfully predicts buckling and bowing distortions. However, it cannot calculate angular distortion accurately. In this paper, a 3D applied plastic strain method has been developed to predict the welding distortions for structures. In the applied strain method, six components of the plastic strain of each weld are calculated by performing a 3D moving source analysis on a small 3D model with a shorter length, then the plastic strain components of the small models are mapped and superposed to a large 3D structural model to obtain the final distortion results. An interpolation algorithm is developed for mapping between meshes with different densities. The effectiveness of the 3D applied plastic strain method is evaluated by comparing to the distortion results from 3D moving source simulations. The mapping algorithm is verified and the effects of the model size on the distortion results are investigated. The numerical results show that the applied plastic strain method accounts all distortion modes, but is only qualitatively accurate for the prediction of angular distortion.

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Yuyang, Liu, Liu Shiqi, and Pan Mao. "Finite Element Simulation of Oil and Gas Reservoir In Situ Stress Based on a 3D Corner-point Grid Model." Mathematical Problems in Engineering 2020 (February 25, 2020): 1–14. http://dx.doi.org/10.1155/2020/7384085.

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A three-dimensional (3D) corner-point grid model gives a relatively accurate description of the structural properties and spatial distribution of oil and gas reservoirs than Cartesian grids. The finite element simulation of the stress field provides a relatively probable presentation of the in situ stress distribution. Both methods are of great importance to the exploration and development of oil and gas fields. Implementing the finite element simulation of in situ stress on a 3D corner-point grid model not only retains the structural attributes of a reservoir but also allows the accurate simulation of the 3D stress distribution. In this paper, we present a method for implementing the finite element simulation of in situ stress based on a 3D corner-point grid model. We first established a fine 3D reservoir model with corner-point grids and then converted the grids into corresponding 3D finite element grid models using a grid conversion algorithm. Next, we simulated the in situ stress distribution with the finite element method. The stress model is then resampled to corresponding corner-point grid geological models using the reverse algorithm. The grid conversion algorithm is to provide data support for the subsequent numerical simulation and other research efforts, thereby guaranteeing procedure continuity and data consistency. Finally, we simulated the stress distribution of a real oil field, the X region. Comparing the simulated result with the measured result, the high agreement validated the effectiveness and accuracy of the proposed method.

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Moreno-Martínez, Jatziri Y., Arturo Galván, Fernando Peña, and Franco Carpio. "Practical Model Proposed for the Structural Analysis of Segmental Tunnels." Applied Sciences 10, no. 23 (November 28, 2020): 8514. http://dx.doi.org/10.3390/app10238514.

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The construction of tunnels has become increasingly common in city infrastructure; tunnels are used to connect different places in a region (for transportation and/or drainage). In this study, the structural response of a typical segmental tunnel built in soft soil was studied using a simplified model which considers the coupling between segmental rings. From an engineering point of view, there is a need to use simple and reliable finite element models. Therefore, a 1D model based on the Finite Element Method (FEM) composed of beam elements to model the segments and elastic-linear springs and non-linear springs to model the mechanical behavior of the joints was performed. To validate the modeling strategy, the numerical results were compared to (lab-based) experimental results, under an Ultimate Limit State, obtained from the literature, and a comparison between numerical results considering a 3D numerical complex model which included the nonlinearity of concrete, reinforcing steel and the joints was performed. With this simplified model, we obtained a prediction of approximately 95% of the ultimate loading capacity compared to the results developed in the experimental and 3D models. This proposed model will help engineers in practice to create “rational” structural designs of segmental tunnel linings when a “low” interaction between rings is expected.

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Kovalovs, Andrejs, Evgeny Barkanov, and Sergejs Gluhihs. "ACTIVE TWIST OF MODEL ROTOR BLADES WITH D-SPAR DESIGN." TRANSPORT 22, no. 1 (March 31, 2007): 38–44. http://dx.doi.org/10.3846/16484142.2007.9638094.

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The design methodology based on the planning of experiments and response surface technique has been developed for an optimum placement of Macro Fiber Composite (MFC) actuators in the helicopter rotor blades. The baseline helicopter rotor blade consists of D‐spar made of UD GFRP, skin made of +450/‐450 GFRP, foam core, MFC actuators placement on the skin and balance weight. 3D finite element model of the rotor blade has been built by ANSYS, where the rotor blade skin and spar “moustaches” are modeled by the linear layered structural shell elements SHELL99, and the spar and foam ‐ by 3D 20‐node structural solid elements SOLID 186. The thermal analyses of 3D finite element model have been developed to investigate an active twist of the helicopter rotor blade. Strain analogy between piezoelectric strains and thermally induced strains is used to model piezoelectric effects. The optimisation results have been obtained for design solutions, connected with the application of active materials, and checked by the finite element calculations.

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Zhang, Jun Ming. "The Geometrical Model of Vertical Shaft Impact Crusher Rotor System." Advanced Materials Research 912-914 (April 2014): 829–32. http://dx.doi.org/10.4028/www.scientific.net/amr.912-914.829.

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The Solid Works environment, through the methods of field surveying and mapping of a vertical shaft impact crusher for structural reverse and design,counter rotating subsystem of the spare parts for 3D geometric modeling. Counter rotating subsystem figure condition check, the 3D model is proved to be correct, for the next dynamic modeling of the model combined with removal and the basis for dynamic simulation.

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Wang, Kai, Ning Zhao, Qiang He, and Jianxin Xu. "A quality analysis method for three-dimensional model in aircraft structural parts design." Advances in Mechanical Engineering 13, no. 3 (March 2021): 168781402110080. http://dx.doi.org/10.1177/16878140211008045.

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To analyze the quality of three-dimensional (3D) model for aircraft structural parts designed by model-based definition (MBD) technology, an approach combining analytic hierarchy process (AHP), hesitant fuzzy linguistic term set (HFLTS), and fuzzy synthetic evaluation is proposed. According to all levels of quality standards and part specification-tree elements, a quality assessment index system is constructed from four sub-models of parts 3D model: design model, process model, tooling model, and test model. In addition, the weight of each index is calculated using the AHP. Then the assessment model is established by using a configurable index system model, HFLTS, fuzzy synthetic evaluation, and assigning uniformly and quantitatively the index system through quality grade division rules of indexes and triangular fuzzy numbers. Finally, a case application is used to illustrate the proposed method. The application of this method can make the quality analysis of parts 3D model more effective, accurate, and efficient. This paper can not only help enterprises identify higher-weight and error-prone design factors, but also guide designers in modeling.

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Suprianto, Made Budiarsa, and Fatmah Dhafir. "3D Structure of VP1 Structural Protein on Enterovirus A71 Using Swiss-Model." BIOEDUSCIENCE: Jurnal Pendidikan Biologi dan Sains 4, no. 1 (June 30, 2020): 37–47. http://dx.doi.org/10.29405/j.bes/4137-474353.

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Background: VP1 structural protein plays a role as a key player in the pathogenesis, has a uniqueness that is interesting enough to be studied by studying the nature and function of structural proteins VP1. This study aims to predict the three-dimensional structure of proteins VP1 on EV-A71. Methods: The target protein is obtained from UniProt server with an access code A0A097EV89using templates 4cey.1.A (PDB ID) were analyzed in silico by homology method using SWISS-MODEL server. Results: Analysis showed the target protein and the template has 95.29% identity and is composed of 297 amino acids with a value of -2.15 QMEAN. Structural protein VP1 in Ramachandran Plots have a stable structure, non-glycine residue in the outlier regions only around 0.34% (A53 ALA) Rated rotamer outliers 1.61%. Conclusion: The three-dimensional structure model of the protein studied has a stable structure and the information obtained is useful for further research in developing vaccines for diseases caused by EV-A71.

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Ritraksa, Siriprapa, and Khamron Mekchay. "3D Structural Model and Visualization of Blood Vessels Based on L-System." Trends in Sciences 18, no. 24 (December 15, 2021): 1407. http://dx.doi.org/10.48048/tis.2021.1407.

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The insight in structures of the blood vessels is a basis for study of blood flows to help understanding the abnormalities of blood vessels that can cause vascular diseases. Basic concept used for constructing structures of blood vessels in organs is arterial branching, which is usually characterized by fractal similarity in the bifurcation pattern. In this work, the concept of Lindenmayer system (L-system) is modified for three-dimensional (3D) tree-like structures to model structures of blood vessels in organs, and then, applied to construct and visualize structural blood vessels via our software created based on openGL and Lazarus program. The structure of blood vessels is constructed based on the physiological law of arterial branching proposed Murray (Murray’s law) under additional assumptions and constraints such as the spreading of blood vessels to cover all directions, the angle condition and the non-overlapping vessels condition. The concept is applied to simulate structures of blood vessels in 3 study cases, including symmetric arterial branching, non-symmetric arterial branching and structure of blood vessel on different domains. The results of structures of blood vessels generated from all cases are measured based on the number of segments, the total blood volume and the fractal dimension. The results of modeling and simulation in this work are illustrated by comparing with other results appeared literature. Moreover, the constructed structures of the blood vessels based on this 3D L-system could be useful for future research such as blood flow, pressure and other properties involving in structures of blood vessels in different organs of human and animals. HIGHLIGHTS A new 3D L-system is developed based on directional vectors for construction of 3D tree-like structures such as structures of blood vessels The model of structures of blood vessels is constructed based on the physiological laws of arterial branching (Murray’s law) with additional assumptions on the spreading of blood vessels, the angle condition, and the non-overlapping of blood vessels Algorithm and software are developed based on L-system to simulate and visualize 3D structures of blood vessels GRAPHICAL ABSTRACT

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Turrini, Claudio, Olivier Lacombe, and François Roure. "Present-day 3D structural model of the Po Valley basin, Northern Italy." Marine and Petroleum Geology 56 (September 2014): 266–89. http://dx.doi.org/10.1016/j.marpetgeo.2014.02.006.

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Chen, C. L., Y. Shapir, and E. H. Chimowitz. "Diffusion scaling through structural templates given by the 3d dynamic Ising model." Chemical Physics Letters 469, no. 1-3 (February 2009): 210–13. http://dx.doi.org/10.1016/j.cplett.2008.12.052.

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Gong, Liang, Yu-Peng Xu, Bin Ding, Zhi-Hao Zhang, and Zhao-Qin Huang. "Thermal management and structural parameters optimization of MCM-BGA 3D package model." International Journal of Thermal Sciences 147 (January 2020): 106120. http://dx.doi.org/10.1016/j.ijthermalsci.2019.106120.

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Bouziani, M., H. Chaaba, and M. Ettarid. "EVALUATION OF 3D BUILDING MODEL USING TERRESTRIAL LASER SCANNING AND DRONE PHOTOGRAMMETRY." International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLVI-4/W4-2021 (October 7, 2021): 39–42. http://dx.doi.org/10.5194/isprs-archives-xlvi-4-w4-2021-39-2021.

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Abstract. The objective of our study is the evaluation of the 3D modeling of buildings and the extraction of structural elements from point clouds obtained using two acquisition techniques (drone and terrestrial laser scanner), as well as the evaluation of the usefulness of their integration. The drone shooting mission was carried using the DJI Phantom 3 Professional and the Sony EXMOR 1/2.3" CMOS RGB camera. For the TLS scanning mission, 9 scanning stations were performed using the FARO Focus S350 laser scanner.To allow the fusion of the two point clouds obtained from drone imagery and TLS, an alignment step is applied. This step was performed using the Iterative Closest Point algorithm. Segmentation was performed using the adapted RANSAC algorithm on point clouds obtained from the drone mission and the TLS mission as well as on the merged point cloud in order to extract structural elements of the building such as windows, doors and stairs. Analysis of the results emphasizes the importance of TLS and drone in 3D modeling. TLS gave better results than the drone in extracting structural elements. This work confirms the importance of complementarity between these two technologies to produce detailed, complete and precise 3D models.

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Zou, F., Ivano Benedetti, and Ferri M. H. Aliabadi. "Dual Boundary Element Model of 3D Piezoelectric Smart Structures." Key Engineering Materials 754 (September 2017): 363–66. http://dx.doi.org/10.4028/www.scientific.net/kem.754.363.

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In this paper, the application of the dual boundary element method (DBEM) in the field of structural health monitoring (SHM) is explored. The model involves a 3D host structure, which is formulated by the DBEM in the Laplace domain, and 3D piezoelectric transducers, whose finite element model is derived from the electro-mechanical behaviour of piezoelectricity. The piezoelectric transducers and the host structure are coupled together via BEM variables. The practicability of this method in active sensing applications is demonstrated through comparisons with established FEM and parametric studies.

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Pan, Yue, Yiqing Dong, Dalei Wang, Airong Chen, and Zhen Ye. "Three-Dimensional Reconstruction of Structural Surface Model of Heritage Bridges Using UAV-Based Photogrammetric Point Clouds." Remote Sensing 11, no. 10 (May 21, 2019): 1204. http://dx.doi.org/10.3390/rs11101204.

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Three-dimensional (3D) digital technology is essential to the maintenance and monitoring of cultural heritage sites. In the field of bridge engineering, 3D models generated from point clouds of existing bridges is drawing increasing attention. Currently, the widespread use of the unmanned aerial vehicle (UAV) provides a practical solution for generating 3D point clouds as well as models, which can drastically reduce the manual effort and cost involved. In this study, we present a semi-automated framework for generating structural surface models of heritage bridges. To be specific, we propose to tackle this challenge via a novel top-down method for segmenting main bridge components, combined with rule-based classification, to produce labeled 3D models from UAV photogrammetric point clouds. The point clouds of the heritage bridge are generated from the captured UAV images through the structure-from-motion workflow. A segmentation method is developed based on the supervoxel structure and global graph optimization, which can effectively separate bridge components based on geometric features. Then, recognition by the use of a classification tree and bridge geometry is utilized to recognize different structural elements from the obtained segments. Finally, surface modeling is conducted to generate surface models of the recognized elements. Experiments using two bridges in China demonstrate the potential of the presented structural model reconstruction method using UAV photogrammetry and point cloud processing in 3D digital documentation of heritage bridges. By using given markers, the reconstruction error of point clouds can be as small as 0.4%. Moreover, the precision and recall of segmentation results using testing date are better than 0.8, and a recognition accuracy better than 0.8 is achieved.

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Bhadoriya, Kamlendra S., Shailesh V. Jain, Sanjaykumar B. Bari, Manish L. Chavhan, and Kuldeep R. Vispute. "3D-QSAR Study of Indol-2-yl Ethanones Derivatives as Novel Indoleamine 2,3-Dioxygenase (IDO) Inhibitors." E-Journal of Chemistry 9, no. 4 (2012): 1753–59. http://dx.doi.org/10.1155/2012/368617.

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3D-QSAR approach usingkNN-MFA was applied to a series of Indol-2-yl ethanones derivatives as novel IDO inhibitors. For the purpose, 22 compounds were used to develop models. To elucidate the structural properties required for IDO inhibitory activity, we report herek-nearest neighbor molecular field analysis (kNN-MFA)-based 3D-QSAR model for Indol-2-yl ethanones derivatives as novel IDO inhibitors. Overall model classification accuracy was 76.27% (q2= 0.7627, representing internal validation) in training set and 79.35% (pred_r2= 0.7935, representing external validation) in test set using sphere exclusion and forward as a method of data selection and variable selection, respectively. Contour maps using this approach showed that hydrophobic and steric effects dominantly determine binding affinities. The information rendered by 3D-QSAR model may lead to a better understanding of structural requirements of IDO inhibitors and can help in the design of novel potent molecules.

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Huang, Bo, Changhong Xu, Rui Huang, and Shusheng Zhang. "An automatic 3D CAD model errors detection method of aircraft structural part for NC machining." Journal of Computational Design and Engineering 2, no. 4 (June 23, 2015): 253–60. http://dx.doi.org/10.1016/j.jcde.2015.06.008.

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Abstract Feature-based NC machining, which requires high quality of 3D CAD model, is widely used in machining aircraft structural part. However, there has been little research on how to automatically detect the CAD model errors. As a result, the user has to manually check the errors with great effort before NC programming. This paper proposes an automatic CAD model errors detection approach for aircraft structural part. First, the base faces are identified based on the reference directions corresponding to machining coordinate systems. Then, the CAD models are partitioned into multiple local regions based on the base faces. Finally, the CAD model error types are evaluated based on the heuristic rules. A prototype system based on CATIA has been developed to verify the effectiveness of the proposed approach. Highlights The 3D CAD model of an aircraft structural part is partitioned into multiple local regions in terms of the base faces. The fillet association level graph is proposed to represent the local region for exploring the CAD model errors. An automatic CAD model error detection method based on heuristics rule is proposed.

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Li, Jia-Wei, and Jiang-Feng Wang. "An improved hybrid lattice Boltzmann flux solver for 3D integrated hypersonic fluid-thermal-structural analysis." International Journal of Modern Physics B 34, no. 14n16 (May 30, 2020): 2040072. http://dx.doi.org/10.1142/s021797922040072x.

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In this paper, a hybrid lattice Boltzmann flux solver (LBFS) is proposed for simulation of 3D integrated hypersonic fluid-thermal-structural problems. In the solver, the macroscopic 3D Navier–Stokes equations and structural heat transfer equation are discretized by the finite volume method and the numerical fluxes at the cell interface are reconstructed by the local solution of Boltzmann equation. To compute the numerical fluxes, two lattice velocity models are introduced. One is the D1Q4 discrete velocity model for calculating the inviscid flux across the cell interface of N–S equations, and the other one is the D3Q6 model for evaluating the flux of structural energy equation. Furthermore, a new dual-thermal-resistance model is proposed to calculate the thermal properties on the fluid-structure interface. To validate the accuracy and stability of the present solver, applications for hypersonic fluid-thermal-structural analysis are demonstrated on aerodynamically heated blunt cone body at [Formula: see text]. Numerical results showed that the present solver can predict accurately the thermal properties of hypersonic fluid-thermal-structural problems and offer the potential for significant improvements in predicting fluid-structural-thermal problems of long-endurance high speed vehicles.

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Gonizzi Barsanti, Sara, Mario Guagliano, and Adriana Rossi. "3D Reality-Based Survey and Retopology for Structural Analysis of Cultural Heritage." Sensors 22, no. 24 (December 7, 2022): 9593. http://dx.doi.org/10.3390/s22249593.

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Cultural heritage’s structural changes and damages can influence the mechanical behaviour of artefacts and buildings. The use of finite element methods (FEM) for mechanical analysis is largely used in modelling stress behaviour. The workflow involves the use of CAD 3D models and the use of non-uniform rational B-spline (NURBS) surfaces. For cultural heritage objects, altered by the time elapsed since their creation, the representation created with the CAD model may introduce an extreme level of approximation, leading to wrong simulation results. The focus of this work is to present an alternative method intending to generate the most accurate 3D representation of a real artefact from highly accurate 3D reality-based models, simplifying the original models to make them suitable for finite element analysis (FEA) software. The approach proposed, and tested on three different case studies, was based on the intelligent use of retopology procedures to create a simplified model to be converted to a mathematical one made by NURBS surfaces, which is also suitable for being processed by volumetric meshes typically embedded in standard FEM packages. This allowed us to obtain FEA results that were closer to the actual mechanical behaviour of the analysed heritage asset.

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Baujard, Clément, Pauline Rolin, Éléonore Dalmais, Régis Hehn, and Albert Genter. "Soultz-sous-Forêts Geothermal Reservoir: Structural Model Update and Thermo-Hydraulic Numerical Simulations Based on Three Years of Operation Data." Geosciences 11, no. 12 (December 9, 2021): 502. http://dx.doi.org/10.3390/geosciences11120502.

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The geothermal powerplant of Soultz-sous-Forêts (France) is investigating the possibility of producing more energy with the same infrastructure by reinjecting the geothermal fluid at lower temperatures. Indeed, during the operation of the powerplant, the geothermal fluid is currently reinjected at 60–70 °C in a deep fractured granite reservoir, and the MEET project aims to test its reinjection at 40 °C. A 3D hydrothermal study was performed in order to evaluate the spreading of the thermal front during colder reinjection and its impact on the production temperature. In the first step, a 3D structural model at fault scale was created, integrating pre-existing models from 2D vintage seismic profiles, vertical seismic profiles, seismic cloud structure and borehole image logs calibrated with well data. This geometrical model was then adapted to be able to run hydrothermal simulation. In the third step, a 3D hydrothermal model was built based on the structural model. After calibration, the effect of colder reinjection on the production temperature was calculated. The results show that a decrease of 10 °C in the injection temperature leads to a drop in the production temperature of 2 °C after 2 years, reaching 3 °C after 25 years of operation. Lastly, the accuracy of the structural model on which the simulations are based is discussed and an update of the structural model is proposed in order to better reproduce the observations.

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Zhao, Chengbi, and Ming Ma. "A Hybrid 2.5-Dimensional High-Speed Strip Theory Method and Its Application to Apply Pressure Loads to 3-Dimensional Full Ship Finite Element Models." Journal of Ship Production and Design 32, no. 04 (November 1, 2016): 216–25. http://dx.doi.org/10.5957/jspd.2016.32.4.216.

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As the three-dimensional (3D) finite element model (FEM) has become the de facto standard for ship structural design, interest in accurately transferring seakeeping loads to panel-based structural models has increased dramatically in recent years. In today's design practices, panel-based hydrodynamic analyses are often used for mapping seakeeping loads to 3D FEM structural models. However, 3D panel-based hydrodynamic analyses are computationally expensive. For monohull ships, methods based on strip theories have been successfully used in the industry for many years. They are computationally efficient, and provide good predictions for motions and hull girder loads. However, many strip theory methods provide only hull girder sectional forces and moments, such as vertical bending moment and vertical shear force, which are difficult to apply to 3D finite element structural models. Previously, the authors have proposed a hybrid strip theory method to transfer 2D strip theory-based seakeeping loads to 3D FEM. In the hybrid approach, the velocity potentials of strip sections are first calculated based on the ordinary 2D strip theories. The velocity potentials of a finite element panel are obtained from the interpolation of the velocity potentials of the strip sections. The panel pressures are then computed based on Bernoulli's equation. Integration of the pressure over the FEM wetted panels yields the hydrodynamic forces and moments. The equations of motion are then formulated based on the FEM. The method not only produces excellent ship motion results, but also results in a perfectly balanced structural model. In this article, the hybrid approach is extended to the 2.5D high-speed strip theory. The simple Rankine source function is used to compute velocity potentials. The original linearized free surface condition, where the forward speed term is not ignored, is used to formulate boundary integral equations. A model based on the Series-64 hull form was used for validating the proposed hybrid method. The motion response amplitude operators are in good agreement with VERES's 2.5D strip theory and with experimental results. Finally, an example is provided for transferring seakeeping loads obtained by the 2.5D hybrid strip theory to a 3D FEM.

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Li, Feng, and Hui Zhao. "3D Real Scene Data Collection of Cultural Relics and Historical Sites Based on Digital Image Processing." Computational Intelligence and Neuroscience 2022 (July 21, 2022): 1–12. http://dx.doi.org/10.1155/2022/9471720.

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Traditional digital geometry mainly focuses on local geometric features such as curvature and normal of 3D models. Although the curvature can describe the geometric curvature of the model surface, these local geometric properties cannot describe the global functional structure and associated properties of the 3D model. The purpose of this paper was to study the accurate splicing of cultural relic fragments based on the intrinsic structural features of the 3D model, such as geometry, texture, and function, whose method is the key to realizing the virtual reconstruction of damaged cultural relics. In this paper, a method for analyzing the intrinsic structure of 3D point cloud data is proposed, the feature representation method of 3D discrete curves and surfaces is studied, and a method for identifying geometric features of 3D point clouds based on the similarity measure of the principal curvature is proposed, which realizes the effective extraction of geometric features of the 3D point cloud model of cultural relics. By calculating the visual curvature distribution of the model under multiscale constraints, the effective extraction of the structural primitives of cultural relics with rich surface noise is realized. The experimental results in this paper show that the initial matching time is 1.416 seconds, the final matching time is 1.555 seconds, the average number of iterations is 13, the average stitching error is 1.7233 mm, and the standard deviation is 1.0265 mm. The experimental data show that the algorithm proposed in this chapter has good convergence characteristics and effectively avoids the divergence phenomenon that is easy to occur in the existing stitching algorithms.

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Šedivý, Josef, and Stepan Hubalovsky. "Principles and Practice of Modeling in CAD." Advanced Materials Research 753-755 (August 2013): 1299–302. http://dx.doi.org/10.4028/www.scientific.net/amr.753-755.1299.

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Computer Aided Engineering are all tools for implementing of simulations and engineering calculations on 3D digital models and assemblies created in the CAD module. Computational algorithm works based on Finite Element Method - FEM. In connection with the design of structural design out strength calculations to determine the stress and strain in the loaded part of the structure is usually carried out. A network of elements is defined on a 3D digital model or assembly. Geometric and structural boundary conditions are specified according to functionality of construction.

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Wlasnowolski, Michal, Michal Sadowski, Tymon Czarnota, Karolina Jodkowska, Przemyslaw Szalaj, Zhonghui Tang, Yijun Ruan, and Dariusz Plewczynski. "3D-GNOME 2.0: a three-dimensional genome modeling engine for predicting structural variation-driven alterations of chromatin spatial structure in the human genome." Nucleic Acids Research 48, W1 (May 22, 2020): W170—W176. http://dx.doi.org/10.1093/nar/gkaa388.

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Abstract Structural variants (SVs) that alter DNA sequence emerge as a driving force involved in the reorganisation of DNA spatial folding, thus affecting gene transcription. In this work, we describe an improved version of our integrated web service for structural modeling of three-dimensional genome (3D-GNOME), which now incorporates all types of SVs to model changes to the reference 3D conformation of chromatin. In 3D-GNOME 2.0, the default reference 3D genome structure is generated using ChIA-PET data from the GM12878 cell line and SVs data are sourced from the population-scale catalogue of SVs identified by the 1000 Genomes Consortium. However, users may also submit their own structural data to set a customized reference genome structure, and/or a custom input list of SVs. 3D-GNOME 2.0 provides novel tools to inspect, visualize and compare 3D models for regions that differ in terms of their linear genomic sequence. Contact diagrams are displayed to compare the reference 3D structure with the one altered by SVs. In our opinion, 3D-GNOME 2.0 is a unique online tool for modeling and analyzing conformational changes to the human genome induced by SVs across populations. It can be freely accessed at https://3dgnome.cent.uw.edu.pl/.

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Zeidan, Zaki M., Ashraf A. Beshr, and Ashraf G. Shehata. "Study the precision of creating 3D structure modeling form terrestrial laser scanner observations." Journal of Applied Geodesy 12, no. 4 (October 25, 2018): 303–9. http://dx.doi.org/10.1515/jag-2018-0009.

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Abstract Laser scanner has become widely used nowadays for several applications in civil engineering. An advantage of laser scanner as compared to other geodetic instruments is its capability of collecting hundreds or even thousands of point per second. Terrestrial laser scanner allows acquiring easy and fast complex geometric data from building, machines, objects, etc. Several experimental and field tests are required to investigate the quality and accuracy of scanner points cloud and the 3D geometric models derived from laser scanner. So this paper investigates the precision of creation three dimensional structural model resulted from terrestrial laser scanner observations. The paper also presented the ability to create 3D model by structural faces depending on the plane equation for each face resulted from coordinates of several observed points cover this face using reflector less total station observations. Precision comparison for the quality of 3D models created from laser scanner observations and structure faces is also presented.The results of the practical measurements, calculations and analysis of results are presented.

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Adán, Antonio, Blanca Quintana, Juan García Aguilar, Víctor Pérez, and Francisco Javier Castilla. "Towards the Use of 3D Thermal Models in Constructions." Sustainability 12, no. 20 (October 15, 2020): 8521. http://dx.doi.org/10.3390/su12208521.

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The use of point clouds in architecture and civil engineering has, to date, been limited almost exclusively to functional geometric features. Nevertheless, hardly any works have attempted to process and explore 3D thermal models for buildings. This paper presents a method for the visualisation and exploration of 3D thermal models (3D-T) of building interiors. A 3D-T model consists of a thermal point cloud, which has been generated with a 3D thermal-scanner platform. Given a 3D-T of a building at a specific time, the user can visualise and navigate through different room models and each room can, in turn, be segmented into its architectonic components (walls, ceilings and floors), from which thermal orthoimages can be generated. When the building is sensed at different times, a 3D temporal-thermal (3D-TT) model is integrated. The temporal-thermal evolution of these structural components, along with selected zones of them, can then be analysed by performing a new type of thermal characterisation. This method has successfully been tested using real building-related data.

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Abu-Hashish, Mohamed F., Hamdalla A. Wanas, and Emad Madian. "3D geological modeling of the Upper Cretaceous reservoirs in GPT oil field, Abu Sennan area, Western Desert, Egypt." Journal of Petroleum Exploration and Production Technology 10, no. 2 (September 25, 2019): 371–93. http://dx.doi.org/10.1007/s13202-019-00780-9.

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Abstract This study aims to construct 3D geological model using the integration of seismic data with well log data for reservoir characterization and development of the hydrocarbon potentialities of the Upper Cretaceous reservoirs of GPT oil field. 2D seismic data were used to construct the input interpreted horizon grids and fault polygons. The horizon which cut across the wells was used to perform a comprehensive petrophysical analysis. Structural and property modeling was distributed within the constructed 3D grid using different algorithms. The workflow of the 3D geological model comprises mainly the structural and property modeling. The structural model includes fault framework, pillar girding, skeleton girding, horizon modeling and zonation and layering modeling processes. It shows system of different oriented major and minor faults trending in NE–SW direction. The property modeling process was performed to populate the reservoir facies and petrophysical properties (volume of shale (Vsh), fluid saturations (Sw and Sh), total and effective porosities (Φt and Φe), net to gross thickness and permeability) as extracted from the available petrophysical analysis of wells inside the structural model. The model represents a detailed zonation and layering configuration for the Khoman, Abu Roash and Bahariya formations. The 3D geological model helps in the field development and evaluates the hydrocarbon potentialities and optimizes production of the study area. It can be also used to predict reservoir shape and size, lateral continuity and degree of interconnectivity of the reservoir, as well as its internal heterogeneity.

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van Beusekom, Bart, George Damaskos, Maarten L. Hekkelman, Fernando Salgado-Polo, Yoshitaka Hiruma, Anastassis Perrakis, and Robbie P. Joosten. "LAHMA: structure analysis through local annotation of homology-matched amino acids." Acta Crystallographica Section D Structural Biology 77, no. 1 (January 1, 2021): 28–40. http://dx.doi.org/10.1107/s2059798320014473.

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Comparison of homologous structure models is a key step in analyzing protein structure. With a wealth of homologous structures, comparison becomes a tedious process, and often only a small (user-biased) selection of data is used. A multitude of structural superposition algorithms are then typically used to visualize the structures together in 3D and to compare them. Here, the Local Annotation of Homology-Matched Amino acids (LAHMA) website (https://lahma.pdb-redo.eu) is presented, which compares any structure model with all of its close homologs from the PDB-REDO databank. LAHMA displays structural features in sequence space, allowing users to uncover differences between homologous structure models that can be analyzed for their relevance to chemistry or biology. LAHMA visualizes numerous structural features, also allowing one-click comparison of structure-quality plots (for example the Ramachandran plot) and `in-browser' structural visualization of 3D models.

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Tsygankov, D. E. "Structural semantic 3D modeling technology in the integrated design process." Journal of «Almaz – Antey» Air and Space Defence Corporation, no. 4 (December 30, 2017): 91–97. http://dx.doi.org/10.38013/2542-0542-2017-4-91-97.

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The paper presents an approach to computer-aided design based on a bijective correspondence between product structure and the process of developing its digital 3D model. The approach proposed makes it possible to retain the semantic integrity of a design concept and reduce development time.

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Journal articles on the topic '3D-structural model'

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