Relevant bibliographies by topics / Dimensional and shape accuracy

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Dimensional and shape accuracy'

Author: Grafiati
Published: 4 June 2021
Last updated: 9 February 2022

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Journal articles on the topic "Dimensional and shape accuracy"

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Miao, Zixiao, and Qican Zhang. "Dual-frequency fringe for improving measurement accuracy of three-dimensional shape measurement." Chinese Optics Letters 19, no. 10 (2021): 102601. http://dx.doi.org/10.3788/col202119.102601.

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Zhu, Qi, and Philippe H. Geubelle. "Dimensional Accuracy of Thermoset Composites: Shape Optimization." Journal of Composite Materials 36, no. 6 (March 2002): 647–72. http://dx.doi.org/10.1177/0021998302036006485.

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Motoc, I., G. R. Marshall, R. A. Dammkoehler, and J. Labanowski. "Molecular Shape Descriptors. 1. Three-Dimensional Molecular Shape Descriptor." Zeitschrift für Naturforschung A 40, no. 11 (November 1, 1985): 1108–13. http://dx.doi.org/10.1515/zna-1985-1106.

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The paper presents and illustrates a method which uses numerical integration of the van der Waals envelope(s) to calculate with desired accuracy the molecular van der Waals volume and the three-dimensional molecular shape descriptor defined as the twin-number [OV(α, β); NOV(β, α), where OV and NOV represent the overlapping and, respectively, the nonoverlapping van der Waals volumes of the molecules α and ß superimposed according to appropriate criteria.
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Ruan, Xiongtao, and Robert F. Murphy. "Evaluation of methods for generative modeling of cell and nuclear shape." Bioinformatics 35, no. 14 (December 7, 2018): 2475–85. http://dx.doi.org/10.1093/bioinformatics/bty983.

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Abstract Motivation Cell shape provides both geometry for, and a reflection of, cell function. Numerous methods for describing and modeling cell shape have been described, but previous evaluation of these methods in terms of the accuracy of generative models has been limited. Results Here we compare traditional methods and deep autoencoders to build generative models for cell shapes in terms of the accuracy with which shapes can be reconstructed from models. We evaluated the methods on different collections of 2D and 3D cell images, and found that none of the methods gave accurate reconstructions using low dimensional encodings. As expected, much higher accuracies were observed using high dimensional encodings, with outline-based methods significantly outperforming image-based autoencoders. The latter tended to encode all cells as having smooth shapes, even for high dimensions. For complex 3D cell shapes, we developed a significant improvement of a method based on the spherical harmonic transform that performs significantly better than other methods. We obtained similar results for the joint modeling of cell and nuclear shape. Finally, we evaluated the modeling of shape dynamics by interpolation in the shape space. We found that our modified method provided lower deformation energies along linear interpolation paths than other methods. This allows practical shape evolution in high dimensional shape spaces. We conclude that our improved spherical harmonic based methods are preferable for cell and nuclear shape modeling, providing better representations, higher computational efficiency and requiring fewer training images than deep learning methods. Availability and implementation All software and data is available at http://murphylab.cbd.cmu.edu/software. Supplementary information Supplementary data are available at Bioinformatics online.
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OSAWA, Sonko, Toshiyuki TAKATSUJI, and Osamu SATO. "High accuracy three-dimensional shape measurements for supporting manufacturing industries." Synthesiology English edition 2, no. 2 (2009): 95–106. http://dx.doi.org/10.5571/syntheng.2.95.

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Beniak, J., P. Križan, Ľ. Šooš, and M. Matúš. "Research on Shape and Dimensional Accuracy of FDM Produced Parts." IOP Conference Series: Materials Science and Engineering 501 (April 9, 2019): 012030. http://dx.doi.org/10.1088/1757-899x/501/1/012030.

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Tian, Liang, Jing Liu, and Wei Guo. "Three-Dimensional Face Reconstruction Using Multi-View-Based Bilinear Model." Sensors 19, no. 3 (January 23, 2019): 459. http://dx.doi.org/10.3390/s19030459.

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Face reconstruction is a popular topic in 3D vision system. However, traditional methods often depend on monocular cues, which contain few feature pixels and only use their location information while ignoring a lot of textural information. Furthermore, they are affected by the accuracy of the feature extraction method and occlusion. Here, we propose a novel facial reconstruction framework that accurately extracts the 3D shapes and poses of faces from images captured at multi-views. It extends the traditional method using the monocular bilinear model to the multi-view-based bilinear model by incorporating the feature prior constraint and the texture constraint, which are learned from multi-view images. The feature prior constraint is used as a shape prior to allowing us to estimate accurate 3D facial contours. Furthermore, the texture constraint extracts a high-precision 3D facial shape where traditional methods fail because of their limited number of feature points or the mostly texture-less and texture-repetitive nature of the input images. Meanwhile, it fully explores the implied 3D information of the multi-view images, which also enhances the robustness of the results. Additionally, the proposed method uses only two or more uncalibrated images with an arbitrary baseline, estimating calibration and shape simultaneously. A comparison with the state-of-the-art monocular bilinear model-based method shows that the proposed method has a significantly higher level of accuracy.
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Petrak, D., S. Dietrich, G. Eckardt, and M. Köhler. "Two-dimensional particle shape analysis from chord measurements to increase accuracy of particle shape determination." Powder Technology 284 (November 2015): 25–31. http://dx.doi.org/10.1016/j.powtec.2015.06.036.

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Kane, J. H., G. Zhao, H. Wang, and K. Guru Prasad. "Boundary Formulations for Three-Dimensional Continuum Structural Shape Sensitivity Analysis." Journal of Applied Mechanics 59, no. 4 (December 1, 1992): 827–34. http://dx.doi.org/10.1115/1.2894049.

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The direct, singular, boundary element analysis formulation is shown to provide a basis for a computationally efficient and accurate shape design sensitivity analysis approach for the structural response of three-dimensional solid objects. The theoretical formulation for surface displacement and traction component sensitivities, and all components of the stress tensor is presented along with a formulation for the recovery of displacement and stress components in the interior of the object under consideration. Discussion of computational issues related to the overall efficiency of these formulations is given, along with numerical results to demonstrate the accuracy and efficiency of this approach.
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Wu, Ge, Duan Li, Pengpeng Hu, Yueqi Zhong, and Ning Pan. "Foot shape prediction using elliptical Fourier analysis." Textile Research Journal 88, no. 9 (February 17, 2017): 1026–37. http://dx.doi.org/10.1177/0040517517693983.

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In this paper, a new method was proposed to establish the relationship between three-dimensional (3D) foot shapes and their two-dimensional (2D) foot silhouettes, through which a complete 3D foot shape can be predicted by simply inputting its two 2D silhouettes. 3D foot scans of 80 participants were randomly selected as the training set, and those of another 20 participants were used as the testing set. Elliptical Fourier analysis (EFA) and principle component analysis (PCA) were adopted to parameterize the 3D foot shapes. A linear regressive model was then developed to predict the 3D foot shape with the foot silhouettes. Experiment results indicated individual 3D foot shape can be predicted with a mean error between 1.21 and 1.27 mm, which can provide enough accuracy for the fit evaluation of footwear.
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Dissertations / Theses on the topic "Dimensional and shape accuracy"

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Champion, Rebecca A. "The role of stereopsis combined with other depth cues in the accurate perception of three-dimensional shape." Thesis, University of Glasgow, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.396535.

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Vlček, Hynek. "Vodní paprsek s 3D hlavou." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231986.

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The diploma thesis is focused on waterjet technology, dimensional and shape accuracy of manufactured parts. In the theoretical section, the principle of technlogy and its use in engineering industry at the present time, are described. Moreover, the theoretical section includes discription of every single parts of the machine of waterjet cutting, that are nowadays used. The biggest part of diploma thesis focuses on 3D cutting technology and on attachments for elimination of undercutting. Practical section focuses on dimensional and shape accuracy of manufactured parts manufactured by waterjet technology that makes use of 3D head and different cutting speed. The practical section also includes operating and maintenance cost of the machine. In terms of maintenance, real service life of components is compared there with a lifespan declarated by machine producer.
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McKnight, Lorrita L. "Two-dimensional shape blending." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape7/PQDD_0020/MQ45097.pdf.

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Trevor, Simon. "Dimensional accuracy of investment casting shells /." [St. Lucia, Qld.], 2000. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16943.pdf.

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Johnston, Elizabeth Buchanan. "Human perception of three-dimensional shape." Thesis, University of Oxford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236266.

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Barthelemy, Bruno. "Accuracy analysis of the semi-analytical method for shape sensitivity analysis." Diss., Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/74754.

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The semi-analytical method, widely used for calculating derivatives of static response with respect to design variables for structures modeled by finite elements, is studied in this research. The research shows that the method can have serious accuracy problems for shape design variables in structures modeled by beam, plate, truss, frame, and solid elements. Local and global indices are developed to test the accuracy of the semi-analytical method. The local indices provide insight into the problem of large errors for the semi-analytical method. Local error magnification indices are developed for beam and plane truss structures, and several examples showing the severity of the problem are presented. The global index provides us with a general method for checking the accuracy of the semi-analytical method for any type of model. It characterizes the difference in errors between a general finite-difference method and the semi-analytical method. Moreover, a method improving the accuracy of the semi-analytical method (when possible) is provided. Examples are presented showing the use of the global index.
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Barry, Sarah Jane Elizabeth. "Longitudinal analysis of three-dimensional facial shape data." Connect to e-thesis, 2008. http://theses.gla.ac.uk/190/.

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Thesis (Ph.D.) - University of Glasgow, 2008.
Ph.D. thesis submitted to the Faculty of Information and Mathematical Sciences, Department of Statistics, University of Glasgow, 2008. Includes bibliographical references. Print version also available.
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Erman, Zeki. "Three-dimensional shape design optimisation using boundary elements." Thesis, Imperial College London, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.281723.

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Barry, Sarah J. E. "Longitudinal analysis of three-dimensional facial shape data." Thesis, University of Glasgow, 2008. http://theses.gla.ac.uk/190/.

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Shape data encompass all the information that is left to describe a shape following removal of location, rotation and scale effects. Much work has been done in the analysis of two-dimensional shapes depicted by anatomical landmarks placed at points of importance. Less has been carried out in the area of three-dimensional shapes, particularly in terms of growth or change over time. This thesis considers the analysis of such longitudinal three-dimensional shape data. In doing so, two well established but normally unrelated areas of Statistics are brought together: those of longitudinal data analysis (specifically, linear mixed effects models) and shape analysis. A recently proposed method of analysing longitudinal high-dimensional data is presented in a novel application within the area of shape analysis, illustrated by a study comparing the facial shapes of cleft-lip and palate children with controls as they grow from three months to two years of age. Both anatomical landmarks and facial curves are considered. Chapter 1 broadly introduces the areas of shape analysis, linear mixed effects models and dimension reduction. Standard methods for measuring shapes are introduced, along with the difficulties inherent in analysing the resulting data. A broad overview of the methods of aligning individual shapes to remove the unwanted effects of location, rotation and scale is given, along with related geometrical issues in terms of the high-dimensional space in which a set of shapes resides. A general introduction to linear mixed effects models compares and contrasts them with simple linear models, explaining the reasons behind using them and presenting the different specifications of the conditional and marginal models. The area of dimension reduction is touched upon, specifically introducing B-splines and principal components analysis, with reference to the analysis of curves consisting of many points at small increments to one another. The data from the cleft-lip and palate study are introduced, along with a discussion of the primary interest of the analysis and the issue of missing data. Chapter 2 presents the statistical definition of a shape and introduces the area of statistical shape analysis in detail, specifically presenting the technicalities of shape space and distances, and methods such as Procrustes alignment of a set of shapes to remove unwanted effects. The concept of tangent coordinates is introduced as a projection of shape data into a Euclidean space, to enable the use of multivariate methods, and an outline given of thin-plate splines and deformations for the analysis of surfaces. Recent literature in the area of shape analysis is presented. Further recent literature addressing the modelling of growth in shapes is presented in Chapter 3, which goes on to discuss the use of linear mixed models on univariate and multivariate longitudinal data. The difficulties of applying mixed models to multivariate data are discussed and a recently proposed alternative method introduced, which involves fitting mixed models to the responses on pairs of outcomes rather than the full set. A description of the R function written as part of this thesis to fit such pairwise models follows, and this is applied to simulated triangles and quadrilaterals as an illustration. The initial application of the pairwise method to the cleft-lip and palate landmark data is presented in Chapter 4. The landmarks are described and the models are fitted to the tangent coordinate responses with different covariance structures for the random effects. The problems that arise and the deficiencies of the fitted models are extensively discussed. Chapter 5 goes on to address the issues raised in Chapter 4. A method of aligning the individual shapes based upon a subset of landmarks is suggested, along with a model that assumes independence of coordinates between dimensions but correlation within, and the benefits of these approaches compared. A simulation study is carried out to investigate the reasons behind and effects of random effects correlations that are estimated as being close to one, concluding that the problem lies in small variances that are poorly estimated, but that this is unlikely to be of severe detriment to the fixed effects estimates. A method of taking the principal components of the tangent coordinates is suggested, where the model responses are the principal components scores, and this proves to be the most appropriate way of applying the pairwise models in terms of model fit and computational efficiency. In Chapter 6, recent literature on the topic of curve analysis is presented, along with the way the facial curves are measured and the need for dimension reduction. Two methods are presented to this end: B-splines and principal components analysis, with the former suffering similar problems to the landmark analyses in terms of poorly estimated random effects variances, and the latter proving more successful. The application of the pairwise models to the principal components scores of the tangent coordinates provides a detailed analysis of the cleft-lip and palate data. Issues surrounding model comparison are addressed in Chapter 7, with several hypothesis tests presented and applied to simulated data. Drawbacks with some of the tests when applied to high dimensional or longitudinal data result in poor performance, but a method suggested by Faraway (1997) and a modification of the likelihood ratio test, both using bootstrapping, show similarly successful results. These are subsequently used to test for any differences in the time trends for the cleft and control groups post-surgery and find that there are significant differences. Condensed forms of this thesis have been presented at invited seminars and international conferences, and may be found in published form in Barry & Bowman (2006), Barry & Bowman (2007) and Barry & Bowman (2008).
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Sun, Jennifer Yun-Man Perona Pietro. "Three-dimensional shape from shading : perception and mechanisms /." Diss., Pasadena, Calif. : California Institute of Technology, 1996. http://resolver.caltech.edu/CaltechETD:etd-09132006-155558.

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Books on the topic "Dimensional and shape accuracy"

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Dudley, John James. Dimensional accuracy of investment castings. Birmingham: University of Birmingham, 1991.

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Get in shape: Two-dimensional and three-dimensional shapes. New York, NY: Children's Press, 2018.

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Milan, Holický, ed. Analysis of dimensional accuracy of building structures. Amsterdam: Elsevier, 1989.

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Stienecker, David. Three-dimensional shapes. New York: Benchmark Books, 1997.

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Robinson, Mark John. Limits to the accuracy of dimensional measurement using machine vision. Manchester: University of Manchester, 1994.

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Zhang, Shuangxi. Characteriation of molecular shape in two-dimensional macromolecular models. Sudbury, Ont: Laurentian University, Chemistry and Biochemistry Department, 1998.

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Turkel, Eli. Accuracy versus convergence rates for a three dimensional multistage Euler code. Hampton, Va: ICASE, 1988.

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Ogawa, Hiroyuki. Testing the accuracy of a three-dimensional acoustic coupled mode model. Monterey, Calif: Naval Postgraduate School, 1991.

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Huyse, Luc. Aerodynamic shape optimization of two-dimensional airfoils under uncertain conditions. Hampton, VA: Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, 2001.

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Nyichomba, Blasius Bavo. The dimensional accuracy of sand castings (commercial aluminium alloys and grey cast iron). Birmingham: University of Birmingham, 1990.

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Book chapters on the topic "Dimensional and shape accuracy"

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Spezialetti, Riccardo, and Federico Tombari. "Three-Dimensional Shape Descriptor." In Computer Vision, 1–7. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-03243-2_423-1.

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Tombari, Federico. "Three Dimensional Shape Descriptor." In Computer Vision, 793–97. Boston, MA: Springer US, 2014. http://dx.doi.org/10.1007/978-0-387-31439-6_423.

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Brady, M., and A. Yuille. "Representing Three-dimensional Shape." In Theory and Practice of Robots and Manipulators, 261–70. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4615-9882-4_29.

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Chen, Lei, and Xiaofang Zhou. "Two-Dimensional Shape Retrieval." In Encyclopedia of Database Systems, 4257–59. New York, NY: Springer New York, 2018. http://dx.doi.org/10.1007/978-1-4614-8265-9_3.

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Kythe, Prem K., and Dongming Wei. "One-Dimensional Shape Functions." In An Introduction to Linear and Nonlinear Finite Element Analysis, 25–36. Boston, MA: Birkhäuser Boston, 2004. http://dx.doi.org/10.1007/978-0-8176-8160-9_2.

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Davies, B. L., A. J. Robotham, and A. Yarwood. "Two-dimensional shape generation." In Computer-aided Drawing and Design, 103–38. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3074-5_5.

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Chen, Lei. "Two-Dimensional Shape Retrieval." In Encyclopedia of Database Systems, 3202–3. Boston, MA: Springer US, 2009. http://dx.doi.org/10.1007/978-0-387-39940-9_3.

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Chen, Lei, and Xiaofang Zhou. "Two-Dimensional Shape Retrieval." In Encyclopedia of Database Systems, 1–3. New York, NY: Springer New York, 2016. http://dx.doi.org/10.1007/978-1-4899-7993-3_3-2.

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Shirai, Yoshiaki. "Shape from Monocular Images." In Three-Dimensional Computer Vision, 141–63. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-82429-6_8.

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Voss, Klaus. "Theoretical Approaches to N-Dimensional Digital Objects." In Shape in Picture, 53–70. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-662-03039-4_5.

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Conference papers on the topic "Dimensional and shape accuracy"

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Sato, Kunihiro, and Yoshihide Iwayama. "High-Accuracy Shape Measurement for Moving Objects by One-Shot Digital Holography." In Digital Holography and Three-Dimensional Imaging. Washington, D.C.: OSA, 2014. http://dx.doi.org/10.1364/dh.2014.dth1b.5.

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Zhao, Biyu, Huimin Yue, Yuxiang Wu, Zhonghua Ou, and Yong Liu. "Accuracy enhancement of three-dimensional surface shape measurement using curvelet transform." In 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2014), edited by Yudong Zhang and Wei Gao. SPIE, 2014. http://dx.doi.org/10.1117/12.2068418.

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Jia, Haoling, Chao Pu, Jason Burton, Feng Zhu, and Yu-wei Wang. "Numerical Investigation of Optimal Rooftop Punch Shape for Force Reduction and Dimensional Accuracy Control." In WCX SAE World Congress Experience. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2019. http://dx.doi.org/10.4271/2019-01-1091.

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Tao, Jing, Huanan Qian, and Suiran Yu. "Mechanical Design for Accuracy of Linkage Servo Press for Near-Net Shape Forming." In ASME 2018 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/detc2018-85508.

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The accuracy of machine is important to achieving highly accurate shapes. This paper is focused on mechanical design of highly accurate mechanical linkage servo press applicable to (near-)net shape forming. The effects of geometric errors, deformations under heavy loads and ram tilting are analyzed. A top-down design for accuracy approach is proposed: First, accuracy model for identification of inaccuracy-causing factors and their interlinking relations is developed. Then, based on this model, top accuracy index are decomposed and translated into structure design specifications at component level. Both analytic and simulation methods are employed for design for accuracy in aspects of dimensional and geometric tolerance allocation, stiffness synthesis and anti-eccentric load capability. A case study of mechanical design for accuracy of a six-linkage mechanical servo press is also presented to demonstrate and test the proposed design approaches.
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Sugii, Yasuhiko. "Three Dimensional Shape Measurement of Micro Droplet Utilizing Micro LIF Technique." In ASME 2008 First International Conference on Micro/Nanoscale Heat Transfer. ASMEDC, 2008. http://dx.doi.org/10.1115/mnht2008-52141.

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This paper describes a novel measurement technique for three dimensional shape of micro droplet utilizing micro LIF (Laser Induced Fluorescence) technique. A measurement system consisted of microscope equipped with 10x lens, high sensitive CCD camera, CW Nd:YAG laser, optical filters and so on. Calibration curve between thickness of micro droplet and emission of fluorescence dye solution was obtained by the use of the PDMS (polydimethylsiloxane) microchip, whose depth varied from 8 to 120 μm fabricated using photo lithography technique. The microchip based calibration method provides high measurement accuracy and eliminate photobreaching effect. Measurement accuracy of the present method in depth direction was about 2 μm assessed using laser displace meter and the spatial resolution in the x-y plane became 6.7 μm. The technique is useful to investigate a two phase flow in micro scale.
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PRZESMYCKI, Aleksander, Tadeusz SAŁACIŃSKI, Maciej WINIARSKI, Rafał ŚWIERCZ, and Tomasz CHMIELEWSKI. "EVALUATION OF SURFACES ROUGHNESS, DIMENSIONAL AND SHAPE ACCURACY OF AL2O3 CERAMICS IN HARDENED STATE AFTER MILLING." In METAL 2019. TANGER Ltd., 2019. http://dx.doi.org/10.37904/metal.2019.878.

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Zhou, Zaoyang, Xueping Zhang, Zhenqiang Yao, and Lifeng Xi. "Predicting Multi-Scale Dimensional Accuracy of Engine Cylinder by Honing." In ASME 2017 12th International Manufacturing Science and Engineering Conference collocated with the JSME/ASME 2017 6th International Conference on Materials and Processing. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/msec2017-2673.

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The deviations of cylinder bore dimensional accuracy have tremendous influence on engine performances including friction power loss, vibration, leak tightness between piston ring and cylinder wall, and abrasive resistance. Many researches were devoted to capturing cylinder dimensional accuracies by honing using analytical, experimental and simulation methods. These researches investigated the topography and roughness of the honed surface, the relationship between the process parameters and the dimensional accuracies. However, most researches focused on macro-scale dimensional accuracy and micro-scale surface texture respectively. To overcome the limitation, a multi-scale model for cylinder bore honing is proposed to predict the dimensional accuracy and surface texture of cylinder bore at macro-scale and micro-scale simultaneously. The model integrates the microscale factors of the honing stone abrasives distribution characteristics, abrasive wear process, previous cylinder surface topography, and macro-scale factors of cylinder geometry and honing head motion trajectory. A Force matching method is adopted to determine the feed depth of cylinder honing process. Thus the model can predict the roundness, cylindricity, roughness and Abbott-Firestone curve of the honed cylinder bore at multi-scale levels. Simulation results show that material removal distribution is closely related to cylinder bore initial shape deviations. The deviations with long wavelengths cannot be eliminated by the sequential honing.
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Heist, Stefan, Martin Landmann, Martin Steglich, Yueqian Zhang, Peter Kühmstedt, and Gunther Notni. "Pattern projection in the short-wave infrared (SWIR): accurate, eye-safe 3D shape measurement." In Dimensional Optical Metrology and Inspection for Practical Applications VIII, edited by Song Zhang and Kevin G. Harding. SPIE, 2019. http://dx.doi.org/10.1117/12.2518205.

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Tang, Jianguo, Shuming Gao, Ming Li, and Feiwei Qin. "Mixed-Dimensional Model Analysis Under Dimension Reduction Error Control." In ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/detc2012-70576.

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In order to conduct engineering analysis efficiently, complex CAD model is generally idealized by dimension reduction of its local thin regions into mid-surfaces, which results in a mixed-dimensional model. However, such dimension reduction inevitably induces analysis errors when plate or shell theory applied to the mixed-dimensional model. In this paper, an evaluation indicator is proposed for estimating analysis error induced by dimension reduction of a original model into mixed-dimensional model and used to control the analysis results of the mixed-dimensional model with given accuracy. The evaluation indicator is defined as the stress difference on the coupling interface between the mixed-dimensional model and the original model. When the mixed-dimensional model is analyzed, p-version solid elements were generated by offsetting the shell nodes in the thickness direction. Moreover, element stiffness matrix, boundary conditions and material properties can be extracted from the analysis results and reused for the indicator computation. Displacements of the mixed-dimensional model are input as initial value to iterative solver to accelerate the computation. When the indicator is below the accuracy, final analysis can be proceeded with p-adaptivity in the thin regions. The hierarchical shape function for p-version solid elements ensures the efficiency of the error estimation and the reliability of the final analysis. The robustness of the evaluation indicator and computational efficiency for final analysis are illustrated by experiments on engineering models.
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Aminzadeh, Masoumeh, and Thomas Kurfess. "Vision-Based Inspection System for Dimensional Accuracy in Powder-Bed Additive Manufacturing." In ASME 2016 11th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/msec2016-8674.

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Laser powder-bed fusion (L-PBF) is an additive manufacturing (AM) process that enables fabrication of functional metal parts with near-net-shape geometries. The drawback to L-PBF is its lack of dimensional precision and accuracy. The efficiency of powder fusion process in powder-bed AM processes is highly affected by process errors, powder irregularities as well as geometric factors. Formation of defects such as lack of fusion and over-fusion due to the aforementioned factors causes dimensional errors that significantly damage the precision. This paper addresses the development of an automated in-situ inspection system for powder-bed additive manufacturing processes based on machine vision. The results of the in-situ automated inspection of dimensional accuracy allows for early identification of faulty parts or alternatively in-situ correction of geometric errors by taking appropriate corrective actions. In this inspection system, 2D optical images captured from each layer of the AM part during the build are analyzed and the geometric errors and defects impairing the dimensional accuracy are detected in each layer. To successfully detect geometric errors, fused geometric objects must be detected in the powder layer. Image processing algorithms are effectively designed to detect the geometric objects from images of low contrast captured during the build inside the chamber. The developed algorithms are implemented to a large number of test images and their performance and precision are evaluated quantitatively. The failure probabilities for the algorithms are also determined statistically.
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Reports on the topic "Dimensional and shape accuracy"

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H. Panahi-Talemi. Two Dimensional Hamiltonian with Generalized Shape Invariance Symmetry. GIQ, 2012. http://dx.doi.org/10.7546/giq-3-2002-369-381.

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Zabarankin, Michael. Semi-Analytical Approach to Three-Dimensional Shape Optimization Problems. Fort Belvoir, VA: Defense Technical Information Center, April 2008. http://dx.doi.org/10.21236/ada482147.

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Banks, H. T., and F. Kojima. Boundary Shape Identification in Two-Dimensional Electrostatic Problems Using SQUIDs. Fort Belvoir, VA: Defense Technical Information Center, January 1998. http://dx.doi.org/10.21236/ada451251.

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Bernal, Javier, Jim Lawrence, Gunay Dogan, and Charles Hagwood. On Computing Elastic Shape Distances between Curves in d-dimensional Space. National Institute of Standards and Technology, June 2021. http://dx.doi.org/10.6028/nist.tn.2164.

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Lei, Lydia. Three dimensional shape retrieval using scale invariant feature transform and spatial restrictions. Gaithersburg, MD: National Institute of Standards and Technology, 2009. http://dx.doi.org/10.6028/nist.ir.7625.

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Tang, Jau, S. N. Dikshit, and J. R. Norris. Study of one-dimensional electron hopping and its effects on ESR line shape. Office of Scientific and Technical Information (OSTI), August 1997. http://dx.doi.org/10.2172/516029.

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Wilson, Anthony, and Cynthia L. Istook. Body Shape Classifications of Males 26 to 35 Using Size USA Three-Dimensional Scan Data. Ames (Iowa): Iowa State University. Library, January 2019. http://dx.doi.org/10.31274/itaa.8805.

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Li, Jin, and ShaoNa Chen. Diagnostic Accuracy of three-dimensional endoanal ultrasound for anal fistula：a systematic review and meta-analysis. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, July 2020. http://dx.doi.org/10.37766/inplasy2020.7.0090.

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Yu, Yanan, Gwia Kim, and Kavita Mathur. Integrating Three-Dimensional Printing With Shape Memory Material: A Renovation of Mass Customization in the Fashion Industry. Ames (Iowa): Iowa State University. Library, January 2019. http://dx.doi.org/10.31274/itaa.8868.

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Qu, Meijing, Zhaohua Jia, Lipeng Sun, and Hui Wang. Diagnostic accuracy of three-dimensional contrast-enhanced ultrasound for focal liver lessions: A protocol for systematic review and meta-analysis. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, May 2021. http://dx.doi.org/10.37766/inplasy2021.5.0096.

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