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image-based modeling of coupled electro-chemo-mechanical behavior of Li-ion battery cathode using an interface-modified reproducing kernel particle method

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ENGINEERING WITH COMPUTERS 2024年 1-32页

作者： Susuki, Kristen Allen, Jeffery Chen, Jiun-Shyan Univ Calif San Diego Dept Struct Engn La Jolla CA 92093 USA Natl Renewable Energy Lab Computat Sci Ctr Golden CO USA

An interface-modified reproducing kernel particle method (IM-RKPM) is introduced in this work to allow for a direct model construction from image pixels of heterogeneous polycrystalline Li-ion battery microstructures. The interface-modified reproducing kernel (IM-RK) approximation is constructed through scaling of a kernel function by a regularized distance function in conjunction with strategic placement of interface node locations. This leads to RK shape functions with either weak or strong discontinuities across material interfaces, suitable for modeling various interface mechanics. With the placement of a triple junction node and distance-based scaling of kernel functions, the resulting IM-RK shape function also possesses proper discontinuities at the triple junctions. This IM-RK approximation effectively remedies the well-known Gibb's oscillation in the smooth approximation of discontinuities. Different from the conventional meshfree approaches for interface discontinuities, this IM-RK approach is done without additional degrees of freedom associated with the enrichment functions, and it is formulated with the standard procedures in the RK shape function construction. This work focuses on identifying the accuracy and convergence properties of IM-RKPM for modeling the coupled electro-chemo-mechanical system. A linear patch test is formulated and numerically tested for the electro-chemo-mechanical coupled problem with a Butler-Volmer boundary condition representing the physical conditions in Li-ion battery microstructures. This is followed by verification of the optimal rates of convergence of IM-RKPM for solving the coupled problem with higher order solutions. The image-based modeling of Li-ion battery microstructures in the numerical examples demonstrates the applicability of the proposed method to realistic Li-ion battery materials modeling.

关键词： Reproducing kernel particle method image based modeling Electro-chemo-mechanical coupling Interface-modified reproducing kernel approximation Li-ion battery

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Spatially-Varying Diffuse Reflectance Capture Using Irradiance Map Rendering for image-based modeling Applications 18

Spatially-Varying Diffuse Reflectance Capture Using Irradian...

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18th IEEE International Symposium on Mixed and Augmented Reality (ISMAR)

作者： Ladefoged, Kasper S. Madsen, Claus B. Aalborg Univ Dept Architecture Design & Media Technol Aalborg Denmark

ISBN: (纸本)9781728109879

image-based 3D modelling using Structure-form-Motion (SfM) has matured significantly over the last decade. Standard SfM methods create the object's texture from the appearance of the physical object at the time of acquisition. We propose a method for acquiring the diffuse per-point reflectance of the modelled object, as part of the image acquisition work flow, only adding one extra captured image and an irradiance rendering step, making it easy for anyone to digitize physical objects to create 3D content for AR/VR using only consumer grade hardware. Current state of the art of spatially varying reflectance capture requires either large, expensive, and purpose built setups or are optimization based approaches, whereas the proposed approach is model based. This paper proposes adding a render of irradiance with modelled camera and light source, using off the shelf hardware for image capture. The key element is taking two images at each imaging location: one with just the ambient illumination conditions, and one where the light from an on-camera flash is included. It is demonstrated how to get the ambient illumination to cancel out, and by assuming Lambertian materials, render the irradiance corresponding to the flash-only image, enabling computation of spatially varying diffuse reflectance rather than appearance. Qualitative results demonstrate the added realism of the modelled objects when used as assets in renders under varying illumination conditions, including limited outdoor scenarios. Quantitative tests demonstrate that the reflectance can be estimated correctly to within a few percent even in cases with severe un-even ambient illumination.

关键词： Albedo generation Diffuse albedo Diffuse Reflectance image based 3D modelling image based modeling Irradiance map Rendering Reflectance SfM Spatially Varying

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Building user interactive capabilities for image-based modeling of patient-specific biological flows in single platform

Building user interactive capabilities for image-based model...

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作者： Liza Shrestha University of Iowa

学位级别：博士

In this work, we have developed user interactive capabilities that allow us to perform segmentation and manipulation of patient-specific geometries required for Computational Fluid Dynamics (CFD) studies, entirely in image domain and within a single platform of 'IAFEMesh'. Within this toolkit we have added commonly required manipulation capabilities for performing CFD on segmented objects by utilizing libraries like ITK, VTK and KWWidgets. With the advent of these capabilities we can now manipulate a single patient specific image into a set of possible cases we seek to study; which is difficult to do in commercially available software like VMTK, Slicer, MITK etc. due to their limited manipulation capabilities. Levelset representation of the manipulated geometries can be simulated in our flow solver (SCIMITAR-3D) without creating any surface or volumetric mesh. This image-levelset-flow framework offers few advantages. 1) We don't need to deal with the problems associated with mesh quality, edge connectivity related to mesh models, 2) and manipulations like boolean operation result in smooth, physically realizable entities which is challanging in mesh domain. We have validated our image-levelset-flow setup with the known results from previous studies. We have modified the algorithm by Krissian et al. and implemented it for the segmentation of Type-A aortic dissection. Finally, we implemented these capabilities to study the hemodynamics in Type-A aortic dissection. Our image based framework is a first of its kind and the hemodynamic study of Type-A dissection too is first study onto the best of our knowledge.

关键词： Aortic dissection CFD image based modeling segmentation wall shear stress

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Monitoring and Measurement of an Artificial Landslide Dam Using UAV images and image-based modeling

Monitoring and Measurement of an Artificial Landslide Dam Us...

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2016 International Conference on Mathematical, Computational and Statistical Sciences and Engineering（MCSSE 2016）

作者： Ming-Der YANG Kai-Siang HUANG Hui-Ping TSAI Department of Civil Engineering Chung Hsing University

Because of heavy rains or earthquakes, landslide and debris flows may flow into rivers and block river channel so to become a landslide dam. Due to the relatively loose nature and the absence of proper engineering spillway, landslide dams are often vulnerable to catastrophic failure by overtopping and breaching, and cause severe flooding in downstream area possibly with serious casualties, such as life loss and property damage. Therefore, the technology development of time-effective monitoring landslide dams becomes an important issue in disaster mitigation. However, the monitoring and assessment of landslide is often difficult due to the timeliness and effectiveness over an unreachable location. Since the timing of dam failure and the magnitude of the resulting flooding downstream are highly affected by the landslide dam size and geometry, the three-dimensional measurement of landslide dam is an essential task in the mitigation act following the occurrence of a landslide lake. Taking responsiveness and efficiency into consideration, this research proposed a process for the monitoring and assessment of landslide dam by employing unmanned aerial vehicles(UAVs) for aerial surveying and image based modeling(IBM) for aerial surveying and a 3D model reconstruction of an artificial landslide dam built in a real Landou stream within Hui-Sun experimental forest in Nantou, Taiwan, as a full-scale on-site experiment. The result shows that a 3D terrain model can be successfully constructed based on the UAV images through IBM process. Especially, the volume and stability of landslide dam is the most urgent information needed to be acquired for mitigation strategy making so that the failure of landslide dams due to dam breach and erosion by the overflow stream can be predicted and prepared.

关键词： Landslide lake Landslide dam UAV image based modeling

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Historic building information modeling using image: Example of port city Massawa, Eritrea

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JOURNAL OF BUILDING ENGINEERING 2023年 78卷

作者： Sewasew, Yishak Tesfamariam, Solomon Univ British Columbia Sch Engn Okanagan Campus3333 Univ Way Kelowna BC V1V 1V7 Canada Univ Waterloo Dept Civil & Environm Engn 200 Univ Ave W Waterloo ON N2L 3G1 Canada

Historic Building Information modeling (HBIM) assists heritage conservation by facilitating the achievement of sustainable development goals. Prior methods in developing HBIM mostly assume site accessibility for conducting a study, availability of expensive cutting-edge technologies, and particular expertise for data acquisition and processing. This has created challenges for some sites, especially in developing countries, where modern technologies and sites are inaccessible. This research aims to develop an alternative HBIM development method for inaccessible heritage sites without requiring modern data acquisition and processing tools. This will be crucial to bridge gaps in HBIM development and facilitate heritage conservation. The method proposed in this research relies on identifying facade images of heritage buildings which will be rectified, segmented, and outlined to determine measurements for digitization. The proposed method was used to develop HBIM with a parametric digital library for heritage building facades in the ancient port city of Massawa, Eritrea. The models developed were further compared, validated, and refined using historic architectural drawings. The results indicate creating HBIM from images is achievable with a higher degree of precision. Despite requiring significant interaction of users, the method will allow image-based HBIM development to facilitate heritage conservation for similar heritage sites that are inaccessible, informationdeprived, and where advanced tools are unavailable. Unlike most prior methods requiring multiple images and sophisticated processes, the proposed method relies on simple steps using an image. Besides, unlike previously used image-based digitization approaches, it enables the creation of parametric models with advanced applications beyond visualization.

关键词： Historic building information modeling (HBIM) Conservation image based modeling 3D digital model Building information modeling (BIM)

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A distributed lumped parameter model of blood flow with fluid-structure interaction

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BIOMECHANICS AND modeling IN MECHANOBIOLOGY 2021年第5期20卷 1659-1674页

作者： Pewowaruk, Ryan Roldan-Alzate, Alejandro Univ Wisconsin Biomed Engn Madison WI 53706 USA Univ Wisconsin Mech Engn Madison WI 53706 USA Univ Wisconsin Radiol Madison WI 53706 USA

A distributed lumped parameter (DLP) model of blood flow was recently developed that can be simulated in minutes while still incorporating complex sources of energy dissipation in blood vessels. The aim of this work was to extend the previous DLP modeling framework to include fluid-structure interactions (DLP-FSI). This was done by using a simple compliance term to calculate pressure that does not increase the simulation complexity of the original DLP models. Verification and validation studies found DLP-FSI simulations had good agreement compared to analytical solutions of the wave equations, experimental measurements of pulsatile flow in elastic tubes, and in vivo MRI measurements of thoracic aortic flow. This new development of DLP-FSI allows for significantly improved computational efficiency of FSI simulations compared to FSI approaches that solve the full 3D conservation of mass and momentum equations while also including the complex sources of energy dissipation occurring in cardiovascular flows that other simplified models neglect.

关键词： Fluid-structure interactions Reduced order model image based modeling Hemodynamics

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A multi-scale computational model for the passive mechanical behavior of right ventricular myocardium

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JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS 2023年第1期142卷 105788页

作者： Li, David S. Mendiola, Emilio A. Avazmohammadi, Reza Sachse, Frank B. Sacks, Michael S. Univ Texas Austin Oden Inst Computat Engn & Sci James T Willerson Ctr Cardiovasc Modeling & Simula Dept Biomed Engn Austin TX 78712 USA Texas A&M Univ Dept Biomed Engn Computat Cardiovasc Bioengn Lab College Stn TX 77843 USA Univ Utah Nora Eccles Harrison Cardiovasc Res & Training Ins Dept Biomed Engn Salt Lake City UT 84112 USA

We have previously demonstrated the importance of myofiber-collagen mechanical interactions in modeling the passive mechanical behavior of right ventricle free wall (RVFW) myocardium. To gain deeper insights into these coupling mechanisms, we developed a high-fidelity, micro-anatomically realistic 3D finite element model of right ventricle free wall (RVFW) myocardium by combining high-resolution imaging and supercomputer-based simulations. We first developed a representative tissue element (RTE) model at the sub-tissue scale by specializing the hyperelastic anisotropic structurally-based constitutive relations for myofibers and ECM collagen, and equi-biaxial and non-equibiaxial loading conditions were simulated using the open-source software FEniCS to compute the effective stress-strain response of the RTE. To estimate the model parameters of the RTE model, we first fitted a 'top-down' biaxial stress-strain behavior with our previous structurally based (tissue-scale) model, informed by the measured myofiber and collagen fiber composition and orientation distributions. Next, we employed a multi-scale approach to determine the tissue-level (5 x 5 x 0.7 mm specimen size) RVFW biaxial behavior via 'bottom-up' homogenization of the fitted RTE model, recapitulating the histologically measured myofiber and collagen orientation to the biaxial mechanical data. Our homogenization approach successfully reproduced the tissue-level mechanical behavior of our previous studies in all biaxial deformation modes, suggesting that the 3D micro-anatomical arrangement of myofibers and ECM collagen is indeed a primary mechanism driving myofiber-collagen interactions.

关键词： Myocardium mechanics image based modeling Finite element modeling

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Ancient Chinese architecture 3D preservation by merging ground and aerial point clouds

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ISPRS JOURNAL OF PHOTOGRAMMETRY AND REMOTE SENSING 2018年第Sep.期143卷 72-84页

作者： Gao, Xiang Shen, Shuhan Zhou, Yang Cui, Hainan Zhu, Lingjie Hu, Zhanyi Chinese Acad Sci Inst Automat Natl Lab Pattern Recognit Beijing 100190 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China CAS Ctr Excellence Brain Sci & Intelligence Techn Beijing 100049 Peoples R China

Ancient Chinese architecture 3D digitalization and documentation is a challenging task for the image based modeling community due to its architectural complexity and structural delicacy. Currently, an effective approach to ancient Chinese architecture 3D reconstruction is to merge the two point clouds, separately obtained from ground and aerial images by the SIM technique. There are two understanding issues should be specially addressed: (1) it is difficult to find the point matches between the images from different sources due to their remarkable variations in viewpoint and scale;(2) due to the inevitable drift phenomenon in any SfM reconstruction process, the resulting two point clouds are no longer strictly related by a single similarity transformation as it should be theoretically. To address these two issues, a new point cloud merging method is proposed in this work. Our method has the following characteristics: (1) the images are matched by leveraging sparse mesh based image synthesis;(2) the putative point matches are filtered by geometrical consistency check and geometrical model verification;and (3) the two point clouds are merged via bundle adjustment by linking the ground-to-aerial tracks. Extensive experiments show that our method outperforms many of the state-of-the-art approaches in terms of ground-to-aerial image matching and point cloud merging.

关键词： image based modeling Ground-to-aerial image matching Ground-to-aerial point cloud merging Digital heritage

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Determination of Bond Strengths in Non-woven Fabrics: a Combined Experimental and Computational Approach

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EXPERIMENTAL MECHANICS 2018年第2期58卷 343-355页

作者： Chen, N. Silberstein, M. N. Cornell Univ Sibley Sch Mech & Aerosp Engn Ithaca NY 14850 USA

Interfiber bonds are important structural components in non-woven fabrics. Bond fracture greatly affects the strength and damage progression in a fiber network structure. Here, we present a novel combined experimental and computational approach to extract bond strengths in non-wovens. In this method, a small specimen is imaged and the obtained 3D geometry of the network is directly modeled in a finite element framework. Bond properties are determined by matching finite element simulation predicted mechanical response to the experimental data. This method is demonstrated by applying it to six specimens of a commercial polypropylene non-woven. A four parameter bi-linear interface law is used with normal stiffness k, shear stiffness beta k, separation at the start of damage d (1), and separation at total loss of bond stiffness d (2). The determined normal strength (kd (1))and shear strength (beta kd (1)) are (1.3 +/- 0.3) x 10(2) MPa and (1.0 +/- 0.2) x 10(2) MPa, respectively. To show that the obtained bond parameters can be applied to a new specimen, a cross validation is conducted whereby parameters are fit from five specimens and then evaluated on the sixth. Additional validation of the obtained bond strength parameters was conducted with larger size artificial network simulations and peel tests. The proposed method in this work carries the dual advantages of characterizing actual bonds in a non-woven and characterizing hundreds of bonds simultaneously. The method can be applied to a variety of non-woven fabrics that are bonded at fiber-fiber intersections.

关键词： Non-woven Bond damage Micro computed tomography image based modeling

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Accurate and efficient ground-to-aerial model alignment

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PATTERN RECOGNITION 2018年 76卷 288-302页

作者： Gao, Xiang Hu, Lihua Cui, Hainan Shen, Shuhan Hu, Zhanyi Chinese Acad Sci Inst Automat Natl Lab Pattern Recognit Beijing 100190 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China CAS Ctr Excellence Brain Sci & Intelligence Techn Beijing 100049 Peoples R China Taiyuan Univ Sci & Technol Sch Comp Sci & Technol Taiyuan 030024 Shanxi Peoples R China

To produce a complete 3D reconstruction of a large-scale architectural scene, both ground and aerial images are usually captured. A common approach is to first reconstruct the models from different image sources separately, and align thetn afterwards. Using this pipeline, this work proposes an accurate and efficient approach for ground-to-aerial model alignment in a coarse-to-fine manner. First, both the ground model and aerial model are transformed into the geo-referenced coordinate system using GPS meta-information for coarse alignment. Then, the coarsely aligned models are refined by a similarity transformation that is estimated based on 3D point correspondences between them, and the 3D point correspondences are determined in a 2D-image-matching manner by considering the rich textural and contextual information in the 2D images. Due to the dramatic differences in viewpoint and scale between ground and aerial images, which make matching them directly nearly impossible, we perform an intermediate view-synthesis step to mitigate the matching difficulty. To this end, the following three key issues are addressed: (a) selecting a suitable subset of aerial images to cover the ground model properly;(b) synthesizing images from the ground model under the viewpoints of the selected aerial images;and finally, (c) obtaining the 2D point matches between the synthesized images and the selected aerial images. The experimental results show that the proposed model alignment approach is quite effective and outperforms several state-of-the-art techniques in terms of both accuracy and efficiency. (C) 2017 Elsevier Ltd. All rights reserved.

关键词： image based modeling Ground-to-aerial model alignment Ground-to-aerial image matching

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