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Journal articles on the topic 'Geometrical deviation model'

Author: Grafiati

Published: 4 May 2024

Last updated: 31 July 2025

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1

Tabar, Roham Sadeghi, Kristina Wärmefjord, and Rikard Söderberg. "A new surrogate model–based method for individualized spot welding sequence optimization with respect to geometrical quality." International Journal of Advanced Manufacturing Technology 106, no. 5-6 (2019): 2333–46. http://dx.doi.org/10.1007/s00170-019-04706-x.

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AbstractIn an individualized shee metal assembly line, form and dimensional variation of the in-going parts and different disturbances from the assembly process result in the final geometrical deviations. Securing the final geometrical requirements in the sheet metal assemblies is of importance for achieving aesthetic and functional quality. Spot welding sequence is one of the influential contributors to the final geometrical deviation. Evaluating spot welding sequences to retrieve lower geometrical deviations is computationally expensive. In a geometry assurance digital twin, where assembly p

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2

Huang, Zhicheng, Jean-Yves Dantan, Alain Etienne, Mickaël Rivette, and Nicolas Bonnet. "Geometrical deviation identification and prediction method for additive manufacturing." Rapid Prototyping Journal 24, no. 9 (2018): 1524–38. http://dx.doi.org/10.1108/rpj-07-2017-0137.

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Purpose One major problem preventing further application and benefits from additive manufacturing (AM) nowadays is that AM build parts always end up with poor geometrical quality. To help improving geometrical quality for AM, this study aims to propose geometrical deviation identification and prediction method for AM, which could be used for identifying the factors, forms and values of geometrical deviation of AM parts. Design/methodology/approach This paper applied the skin model-based modal decomposition approach to describe the geometrical deviations of AM and decompose them into different

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Nguyen, Dinh Son, Frederic Vignat, and Daniel Brissaud. "Geometrical Deviation Model of product throughout its life cycle." International Journal of Manufacturing Research 6, no. 3 (2011): 236. http://dx.doi.org/10.1504/ijmr.2011.041128.

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4

Polini, Wilma, and Andrea Corrado. "A Unique Model to Estimate Geometric Deviations in Drilling and Milling Due to Two Uncertainty Sources." Applied Sciences 11, no. 5 (2021): 1996. http://dx.doi.org/10.3390/app11051996.

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Industry 4.0 involves the use of information and communication technologies to transform industry by intelligent networking machines and processes. The availability of big data sets from manufacturing and inspection allow for developing new and more accurate simulation models. This involves the development of new machining simulation models to consider the geometrical deviations of the workpiece due to the machine tool, the part datum surfaces and the fixturing equipment. This work presents a model that kinematically correlates the locator uncertainty, the form deviation on the part datum surf

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Sánchez-Sola, José Miguel, Moisés Batista, Jorge Salguero, Alvaro Gómez, and Mariano Marcos Bárcena. "Cutting Speed-Feed Based Parametric Model for Macro-Geometrical Deviations in the Dry Turning of UNS A92024 Al-Cu Alloys." Key Engineering Materials 504-506 (February 2012): 1311–16. http://dx.doi.org/10.4028/www.scientific.net/kem.504-506.1311.

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This work reports on the results of a study of different macro-geometrical deviation parameters, such as Straightness (SD), Parallelism (PD) and Circularity (CD) as a function of cutting speed (v) and feed (f) of dry turned UNS A92024 (Al-Cu) cylindrical bars. The results obtained have allowed establishing exponentials parametric model for predicting these deviations as a function of those cutting parameters. As a consequence of that, geometrical surfaces SD(f,v), PD(f,v) and CD(f,v) have been developed for this alloy. These surfaces allows determining marginal curves for specific v and f valu

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Dash, Satabdee, and Axel Nordin. "TOWARDS REALISTIC NUMERICAL MODELLING OF THIN STRUT-BASED 3D-PRINTED STRUCTURES." Proceedings of the Design Society 3 (June 19, 2023): 3591–600. http://dx.doi.org/10.1017/pds.2023.360.

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AbstractThe as-built geometry and material properties of parts manufactured using Additive Manufacturing (AM) can differ significantly from the as-designed model and base material properties. These differences can be more pronounced in thin strut-like features (e.g., in a lattice structure), making it essential to incorporate them when designing for AM and predicting their structural behaviour. Therefore, the aim of this study is to develop a numerical model with realistic characteristics based on a thin strut-based test artefact and to use it accurately for estimating its compressive strength

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Liu, Xueshu, Yuxing Yang, Li Huang, Ping Zhang, and Hang Gao. "Numerical Analysis of the Influences of Geometrical Deviation on Delamination in Composite Laminates around the Countersunk Hole." International Journal of Aerospace Engineering 2018 (2018): 1–11. http://dx.doi.org/10.1155/2018/5061948.

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During countersunk hole machining, defects like geometrical deviation of the chamfer angle and delamination are easily introduced into the structure. To investigate the influences of geometrical deviation on delamination propagation around the countersunk hole during assembly, a progressive damage model (PDM) combining cohesive element was proposed and validated. Numerical analyses were then carried out to study delamination propagation behavior under the influences of geometrical parameters including delamination factor, chamfer angle, and location of delamination. The results show that when

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Zhao, Binbin, Yunlong Wang, Qingchao Sun, Yuanliang Zhang, Xiao Liang, and Xuewei Liu. "Monomer model: an integrated characterization method of geometrical deviations for assembly accuracy analysis." Assembly Automation 41, no. 4 (2021): 514–23. http://dx.doi.org/10.1108/aa-11-2020-0165.

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Purpose Assembly accuracy is the guarantee of mechanical product performance, and the characterization of the part with geometrical deviations is the basis of assembly accuracy analysis. Design/methodology/approach The existed small displacement torsors (SDT) model cannot fully describe the part with multiple mating surfaces, which increases the difficulty of accuracy analysis. This paper proposed an integrated characterization method for accuracy analysis. By analyzing the internal coupling relationship of the different geometrical deviations in a single part, the Monomer Model was establishe

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Kwintarini, Widyanti, Agung Wibowo, and Yatna Yuwana Martawirya. "Mathematical Approach for Geometric Error Modeling of Three Axis CNC Vertical Milling Machine." Applied Mechanics and Materials 842 (June 2016): 303–10. http://dx.doi.org/10.4028/www.scientific.net/amm.842.303.

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The aim of this paper overviews about to find out the errors that come from three axis CNC vertical milling machine. The errors come from, the CNC milling machine can be modelled into mathematical models and later on these error models will be used to analyse the errors in the measured data. Many errors from CNC machine tools have given significant effects toward the accuracy and repeatability of manufacturing process. There are two error sources come from CNC machine tools such as tool deflection and thermal distortions of machine tool structure. These errors later on will contribute to resul

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Xu, Bin, So Ito, Yuki Shimizu, and Wei Gao. "Eccentric Error Compensation for Pitch Deviation Measurement of Gears." Key Engineering Materials 523-524 (November 2012): 853–58. http://dx.doi.org/10.4028/www.scientific.net/kem.523-524.853.

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An eccentric error compensation method is presented for the pitch deviation measurement of gears. The eccentric error compensation method mainly consists of the evaluation of the assembly accuracy, the reconstruction of the reference curve and the coordinate compensation of intersection points. The geometrical model of the measurement system was analyzed and the corresponding mathematical model was proposed. A gear with small modulus was adopted as the specimen for the pitch deviation measurement. Experimental results reveal that the values of eccentricity can be extracted from the measured pr

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Dionisius, Felix, Sugiri ,, Tito Endramawan, and Emin Haris. "Geometrical Study of Channel Profile under Incremental Forming Process: Numerical Simulation." Journal of Mechanical Engineering 16, no. 2 (2019): 1–10. http://dx.doi.org/10.24191/jmeche.v16i2.15322.

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Incremental forming is one of the innovative manufacturing technologies in plate sheet forming techniques. With the incremental forming process, plate formation can be as desired and also easily applied to the manufacturing with a limited number of products. This paper is conducted to find out the smallest geometry of deviation between the design with the results of the process and the best step-down selection using a single point incremental forming (SPIF). The variable variations used in this research was 2-6 (mm) of step-down where this process uses a punch tool in the form of a hemispheric

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Strauss, Yosef, Lawrence P. Horwitz, Jacob Levitan, and Asher Yahalom. "Canonical Transformation of Potential Model Hamiltonian Mechanics to Geometrical Form I." Symmetry 12, no. 6 (2020): 1009. http://dx.doi.org/10.3390/sym12061009.

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Using the methods of symplectic geometry, we establish the existence of a canonical transformation from potential model Hamiltonians of standard form in a Euclidean space to an equivalent geometrical form on a manifold, where the corresponding motions are along geodesic curves. The advantage of this representation is that it admits the computation of geodesic deviation as a test for local stability, shown in recent previous studies to be a very effective criterion for the stability of the orbits generated by the potential model Hamiltonian. We describe here an algorithm for finding the generat

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Podshivalov, I. I. "Stress-strain state model of building metal frame made of tube trusses and bar joists with regard to geometrical imperfections." Vestnik Tomskogo gosudarstvennogo arkhitekturno-stroitel'nogo universiteta. JOURNAL of Construction and Architecture 26, no. 1 (2024): 118–26. http://dx.doi.org/10.31675/1607-1859-2024-26-1-118-126.

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The paper studies the metal frame industrial building during the reconstruction of its bar joists having imperfections in the form of non-uniform geometric deviations from the vertical position.Purpose: The aim of this work is to calculate the allowable value of horizontal deviation of bar joists from the vertical position.Methodology: The computational justification of using roof bar joists with regard to geometric imperfections in the reconstruction of the industrial building, is provided by modeling the stress-strain state of the metal frame in Ing + 2021, MicroFe software using the finite

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Frumuşanu, Gabriel, and Alexandru Epureanu. "Part Accuracy Management by Topological Mapping of Deviations." Applied Mechanics and Materials 859 (December 2016): 210–16. http://dx.doi.org/10.4028/www.scientific.net/amm.859.210.

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Despite modern manufacturing processes are characterized by a continuously increasing accuracy, geometric deviations inherently appear on every manufactured part so, for quality-aware companies, it is essential to control and to manage them. This paper introduces a new type of part geometrical model, namely the part topological map, in connection with a new approach in part accuracy management. The part topological map enables a global analytical & synthetic approach of the problems related to tolerancing domain and a generalization of the “part accuracy” concept. The part geometry is seen

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Xu, Xun, Haidong Yu, Yunyong Li, and Xinmin Lai. "Compliant assembly deviation analysis of large-scale thin-walled structures in different clamping schemes via ANCF." Assembly Automation 40, no. 2 (2019): 305–17. http://dx.doi.org/10.1108/aa-01-2019-0018.

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Purpose The structure stiffness is greatly affected by the fixture constraints during assembly due to the flexibility of large-scale thin-walled structures. The compliant deformation of structures is usually not consistent for the non-uniform stiffness in various clamping schemes. The purpose of this paper is to investigate the correlation between the assembly quality and the clamping schemes of structures with various initial deviations and geometrical parameters, which is based on the proposed irregular quadrilateral plate element via absolute nodal coordinate formulation (ANCF). Design/meth

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Jalid, Abdelilah, Said Hariri, and Jean Paul Senelaer. "Estimation of form deviation and the associated uncertainty in coordinate metrology." International Journal of Quality & Reliability Management 32, no. 5 (2015): 456–71. http://dx.doi.org/10.1108/ijqrm-06-2012-0087.

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Purpose – The uncertainty evaluation for coordinate measuring machine metrology is problematic due to the diversity of the parameters that can influence the measurement result. From discrete coordinate data taken on curve (or surface) the software of these machines proceeds to an identification of the measured feature, the parameters of the substitute feature serve in the phase of calculation to estimate the form error of form, and the decisions made based on the result measurement may be outliers when the uncertainty associated to the measurement result is not taken into account. The paper ai

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Dey, Indira, Sergei Egorov, Fabian Soffel, and Konrad Wegener. "Model-Based Heat Input Control Validated on Martensitic Steel 1.4313." Key Engineering Materials 969 (December 12, 2023): 49–56. http://dx.doi.org/10.4028/p-vbabf9.

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The ability of direct metal deposition (DMD) to fabricate complex geometries is still limited. Especially in thin-walled structures heat accumulation can lead to intolerable geometric deviation and which has to be avoided. Combining thin walls and massive sections in one layer requires parameter adapting for each section within a layer. An existing semi-empirical model predicts the optimal process parameters for the austenitic steel 1.4404. This study demonstrates the validity of the model for martensitic steel 1.4313 by an experimental campaign. The demonstrators are characterized by a massiv

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Stark, Sibylle, Martin Beutner, Falk Lorenz, Thomas Lampke, Bernhard Karpuschewski, and Thorsten Halle. "Experimental and Numerical Determination of Cutting Forces and Temperatures in Gear Hobbing." Key Engineering Materials 504-506 (February 2012): 1275–80. http://dx.doi.org/10.4028/www.scientific.net/kem.504-506.1275.

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Hobbing is one of the most productive methods for manufacturing external gears. According to the requirements of green manufacturing, the lubrication in gear hobbing has to be reduced with the final aim of dry machining. Influences due to thermal aspects during machining have to be considered, especially in hobbing of large modules or ring gears, because in this case, hobbing could be the last step in the process chain. Within the priority program (SPP) “Modeling, Simulation and Compensation of Thermal Effects for Complex Machining Processes”, founded by the DFG, special emphasis is laid on th

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Habibi, Nabil, Abdelilah Jalid, and Abdelouahab Salih. "Form Deviation Uncertainty and Conformity Assessment on a Coordinate Measuring Machine." Machines 12, no. 10 (2024): 704. http://dx.doi.org/10.3390/machines12100704.

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Coordinate measuring machines are widely used in the industrial field due to their ease of automation. However, estimating the measurement uncertainty is a delicate task, especially when controlling for deviation, given the large number of factors that influence the measurement. A precise estimate of the uncertainty is crucial to avoid incorrect conformity assessments. The purpose of this study is to control geometrical-form tolerance specifications, taking into consideration their associated uncertainty. A surface fitting model based on the least squares criterion is proposed, allowing one to

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Cheng, Yun Yong, Zhen Zhen Zhu, and Ding Hua Zhang. "Geometrical Shape Analysis for Investment Casting Turbine Blade Based on Optical Measurement." Applied Mechanics and Materials 365-366 (August 2013): 716–19. http://dx.doi.org/10.4028/www.scientific.net/amm.365-366.716.

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Turbine blade is one of the key components of the aero engine. It needs to be inspected comprehensively and carefully during its production stage. The methods for investment turbine blade geometrical shape analysis based on optical scanning measurement were presented, including optical measurement data collection, blade model reliable alignment and geometrical shape deviation fast calculation and visualization. Real measurement data from a structure light measurement device for a turbine blade was used to validate the discussed methods.

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Mühlstädt, Mike, Wolfgang Seifert, Matthias ML Arras, Stefan Maenz, Klaus D. Jandt, and Jörg Bossert. "An advanced geometrical model for laminated woven fabrics using Lamé exponents with enhanced accuracy." Journal of Composite Materials 52, no. 11 (2017): 1443–55. http://dx.doi.org/10.1177/0021998317725570.

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Three-dimensional stiffness tensors of laminated woven fabrics used in high-performance composites need precise prediction. To enhance the accuracy in three-dimensional stiffness tensor prediction, the fabric’s architecture must be precisely modeled. We tested the hypotheses that: (i) an advanced geometrical model describes the meso-level structure of different fabrics with a precision higher than established models, (ii) the deviation between predicted and experimentally determined mean fiber-volume fraction ( cf) of laminates is below 5%. Laminates of different cf and fabrics were manufactur

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Zhi, Junnan, Yanlong Cao, Tukun Li, et al. "A digital twin-based analysis method to assess geometric variations for parts in batch production." Digital Twin 3 (August 24, 2023): 7. http://dx.doi.org/10.12688/digitaltwin.17863.1.

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Background: In mass production, engineers are more concerned with the statistical distribution accuracy of parts in mass production rather than just the qualification of individual parts. However, currently, the statistical analysis methods designed for product accuracy are relatively scattered, and most of them focus on nominal part models. Therefore, there is a need to design a statistical analysis method for parts in mass production based on the Digital Twin model. Methods: This paper presents a novel method to analyse the geometric variations of parts in batch production in the production

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Zhi, Junnan, Yanlong Cao, Tukun Li, et al. "A digital twin-based analysis method to assess geometric variations for parts in batch production." Digital Twin 3 (December 19, 2023): 7. http://dx.doi.org/10.12688/digitaltwin.17863.2.

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Background In mass production, engineers are more concerned with the statistical distribution accuracy of parts in mass production rather than just the qualification of individual parts. However, currently, the statistical analysis methods designed for product accuracy are relatively scattered, and most of them focus on nominal part models. Therefore, there is a need to design a statistical analysis method for parts in mass production based on the Digital Twin model. >Methods This paper presents a novel method to analyse the geometric variations of parts in batch production in the productio

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Tarraf, Walid, Diogo Queiros-Condé, Patrick Ribeiro, and Rafik Absi. "Fractal Geometric Model for Statistical Intermittency Phenomenon." Entropy 25, no. 5 (2023): 749. http://dx.doi.org/10.3390/e25050749.

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The phenomenon of intermittency has remained a theoretical concept without any attempts to approach it geometrically with the use of a simple visualization. In this paper, a particular geometric model of point clustering approaching the Cantor shape in 2D, with a symmetry scale θ being an intermittency parameter, is proposed. To verify its ability to describe intermittency, to this model, we applied the entropic skin theory concept. This allowed us to obtain a conceptual validation. We observed that the intermittency phenomenon in our model was adequately described with the multiscale dynamics

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Lopato, Przemyslaw, Michal Herbko, Paulina Gora, Ulrich Mescheder, Andras Kovacs, and Alexander Filbert. "Numerical Analysis of the Influence of Fabrication Process Uncertainty on Terahertz Metasurface Quality." Electronics 12, no. 10 (2023): 2198. http://dx.doi.org/10.3390/electronics12102198.

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The purpose of this paper was to investigate the influence of fabrication process uncertainty on terahertz metasurface quality. The focus was on the effect of metasurface fabrication inaccuracy on resonances. To the best of our knowledge, this is the first paper to study the effect of the metasurface fabrication process on its resonant frequency. The terahertz split ring resonator-based metasurface is under consideration. Using a numerical model, the influence of the uncertainty of various geometrical parameters obtained during the fabrication process (mainly layer deposition, photolithography

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Zhao, Cai Qi, Jun Ma, and De Lin Li. "Stability Analysis of Nantong Sports and Exhibition Center Based on Measured Geometrical Imperfections." Advanced Materials Research 163-167 (December 2010): 426–32. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.426.

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Position deviation of joints is a primary initial geometrical imperfection that affects the stability of long-span spatial structures. It makes field measurement of joint coordinate for the shell and roof initial shape of Nantong Sports Exhibition Center upon its completion. This paper researches the stochastic distribution feature and statistical parameter of geometrical imperfections for the data sources of above position deviation of joints by “abnormal data test method”. The results indicate that the distribution of abnormal data is concentrated, which is related to the difficulty of const

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Sánchez, J. M., M. A. Sebastián, E. Rubio, Manuel Sánchez-Carrilero, L. Sevilla, and Mariano Marcos Bárcena. "A Parametric Model for the Straightness Deviation in the Cutting Processes of Aluminum Alloys." Materials Science Forum 526 (October 2006): 31–36. http://dx.doi.org/10.4028/www.scientific.net/msf.526.31.

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Light alloys are increasingly applied in different industrial sectors, mainly aerospace. Because of this, it is needed to analyze their behavior in the different processing procedures and, specially, machining. On the other hand, up to a few years, cutting fluids were successfully employed in these processes since their coolant and lubricant properties. Notwithstanding, environmental necessities have promoted researches focused on the development of cleaner processes avoiding cutting fluids, in particular, dry machining. However, this process can change tool geometry and affect to the material

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Ben-Haim, Y. "Convex Models of Uncertainty in Radial Pulse Buckling of Shells." Journal of Applied Mechanics 60, no. 3 (1993): 683–88. http://dx.doi.org/10.1115/1.2900858.

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The buckling of shells subject to radial impulse loading has been studied by many investigators, and it is well known that the severity of the buckling response is greatly amplified by initial geometrical imperfections in the shell shape. Traditionally, these imperfections have been modeled stochastically. In this study convex models provide a convenient alternative to probabilistic representation of uncertainty. Convex models are well suited to the limitations of the available information on the nature of the geometrical uncertainties. A n ellipsoidal convex model is employed and the maximum

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Josnin, Jean-Yves, Hervé Jourde, Pascal Fénart, and Pascal Bidaux. "A three-dimensional model to simulate joint networks in layered rocks." Canadian Journal of Earth Sciences 39, no. 10 (2002): 1443–55. http://dx.doi.org/10.1139/e02-043.

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Modelling the discontinuity network of fractured reservoirs may be addressed (1) by purely stochastic means, (2) with a fractal approach, or (3) using mechanical parameters describing the spatial organisation of fracture systems. Our paper presents an approach where the geometrical properties of the fracture networks are incorporated in the form of both statistical and mechanical rules. This type of approach is particularly suitable to model stratified fractured rock masses comprising two orthogonal families of joints and a family of sedimentary discontinuities. Their geometrical arrangement i

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Liu, Feng Lin, Quan Kang, and Bing He. "Permissible Deviation of Rotation Center Based on Fan-Beam Projection ICT System." Advanced Materials Research 452-453 (January 2012): 21–30. http://dx.doi.org/10.4028/www.scientific.net/amr.452-453.21.

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For ICT wide fan-beam scanning, there is a geometrical supposition that the object rotation center and the radiation source center intersect the image reconstruction center. In practice, the existing intersection deviation has influence on the image reconstruction precision. The image reconstruction mathematical model for shifted rotation center was established, and the relationship between the deviation error and reconstructed image precision was studied by simulation. As a result, for 512×512 CT reconstructed image, there is no distinctive difference between the reference image and the recon

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Turnic, Dragana, Srdjan Zivkovic, Marija Spasojevic-Surdilovic, Marko Milosevic, and Aleksandra Igic. "Influence of geometrical and structural imperfections on the behavior of steel plate girders." Facta universitatis - series: Architecture and Civil Engineering 19, no. 2 (2021): 171–82. http://dx.doi.org/10.2298/fuace211130013t.

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The girders or parts of the girders are not ideally flat in terms of their geometry. The deviations that occur are defined as geometric imperfections. Also, in the material from which the girder is made, a certain deviation may occur during factory production or for some other reason, which is known as structural imperfection. This paper presents the analysis of the behavior of plate girders (welded steel I girders), with and without material stiffening and loaded with patch loading. The results were obtained by numerical simulation in the ANSYS for models with included geometric imperfections

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Chen, Fei, Ming Li, and Peng Zhang. "Distribution of Energy Density and Optimization on the Surface of the Receiver for Parabolic Trough Solar Concentrator." International Journal of Photoenergy 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/120917.

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The geometrical optics model about the offset effect of solar rays by the thickness of concentrating mirror and the diametric solar model were established. The radiant flux density on the surface of the receiver for parabolic trough solar concentrator was obtained by numerical calculation with the established models. Charge-coupled device (CCD) was used for testing gray image on the surface of the receiver for parabolic trough solar concentrator. The image was analyzed by Matlab and the radiant flux density on the surface of the receiver for parabolic trough solar concentrator was achieved. It

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Vale, Cecília, and Isabel M. Ribeiro. "RAILWAY CONDITION-BASED MAINTENANCE MODEL WITH STOCHASTIC DETERIORATION." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 20, no. 5 (2014): 686–92. http://dx.doi.org/10.3846/13923730.2013.802711.

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The application of mathematical programming for scheduling preventive maintenance in railways is relatively new. This paper presents a stochastic mathematical model designed to optimize and to predict tamping operations in ballasted tracks as preventive condition-based maintenance. The model is formulated as a mixed 0–1 nonlinear program that considers real technical aspects as constraints: the reduction of the geometrical track quality over time is characterized by the deterioration rate of the standard deviation of the longitudinal level; the track layout; the dependency of the track recover

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Chuang, Xihong, Sanqi Li, Yingtao Hu, and Xin Zhou. "Impact of Geometrical Features on Solute Transport Behavior through Rough-Walled Rock Fractures." Water 15, no. 1 (2022): 124. http://dx.doi.org/10.3390/w15010124.

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The solute transport in the fractured rock is dominated by a single fracture. The geometric characteristics of single rough-walled fractures considerably influence their solute transport behavior. According to the self-affinity of the rough fractures, the fractal model of single fractures is established based on the fractional Brownian motion and the successive random accumulation method. The Navier–Stokes equation and solute transport convective-dispersion equation are employed to analyze the effect of fractal dimension and standard deviation of aperture on the solute transport characteristic

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Rahman, M. A., A. B. Baharudin, S. Adi, et al. "Dimensional Deviation Affected by Cutting Parameters and Machine Tool Rigidity in Dry Turning of S45C Steel." Applied Mechanics and Materials 315 (April 2013): 749–54. http://dx.doi.org/10.4028/www.scientific.net/amm.315.749.

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Performance of machining processes is assessed by dimensional and geometrical accuracy which is mentioned in this paper as dimensional deviation. A part quality does not depend solely on the depth of cut, feed rate and cutting speed. Other variable such as excessive machine tool vibration due to insufficient dynamic rigidity can be deleterious to the desired results. The focus of the present study is to find a correlation between dimensional deviation against cutting parameters and machine tool vibration in dry turning. Hence cutting parameters and vibration-based regression model can be estab

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Wang, Hao, Hamzeh A. Al Shraida, and Jin Yu. "Predictive Modeling of Out-of-Plane Deviation for the Quality Improvement of Additive Manufacturing." Materials Science Forum 1086 (April 27, 2023): 79–83. http://dx.doi.org/10.4028/p-12034b.

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Additive manufacturing (AM) is a new technology for fabricating products straight from a 3D digital model, which can lower costs, minimize waste, and increase building speed while maintaining acceptable quality. However, it still suffers from low dimensional accuracy and a lack of geometrical quality standards. Moreover, there is a need for a robust AM configuration to perform in-situ inspections during the fabrication. This work established a 3D printing-scanning setup to collect 3D point cloud data of printed parts and then compare them with nominal 3D point cloud data to quantify the deviat

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Campi, Federico, Marco Mandolini, Claudio Favi, Emanuele Checcacci, and Michele Germani. "An analytical cost estimation model for the design of axisymmetric components with open-die forging technology." International Journal of Advanced Manufacturing Technology 110, no. 7-8 (2020): 1869–92. http://dx.doi.org/10.1007/s00170-020-05948-w.

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Abstract Open-die forging is a manufacturing process commonly used for realising simple shaped components with high mechanical performances and limited capability in terms of production volume. To date, an analytical model for estimating the costs of components manufactured with this technology is still an open issue. The paper aims to define an analytical model for cost estimation of axisymmetric components manufactured by open-die forging technology. The model is grounded on the analysis of geometrical features available at the design stage providing a detailed cost breakdown in relation to

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Bolotov, Mikhail, Iliya Grachev, and Evgeny Kudashov. "Investigation of parts assembly error, taking into account the deviation of the shape of their surfaces." MATEC Web of Conferences 224 (2018): 01098. http://dx.doi.org/10.1051/matecconf/201822401098.

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In this article, we study the errors in the assembly of parts, taking into account the deviation of the shape of their surfaces. The developed computer model of the assembly of the engine low-pressure turbine rotor is designed to predict the values of the assembly parameters, such as radial and face run-out. The forecasting of the above assembly parameters is carried out based on the data of actual dimensions and shape of the surfaces of parts assembled as an assembly unit. The analysis of study results made it possible to obtain a conclusion about the qualitative influence of geometrical erro

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Thuan, Vo Van. "Klein-Gordon-Fock equation from Einstein general relativity." Communications in Physics 26, no. 2 (2016): 181. http://dx.doi.org/10.15625/0868-3166/26/2/7866.

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A time-space symmetry based cylindrical model of geometrical dynamics was proposed. Accordingly, the solution of Einstein gravitational equation in vacuum has a duality: an exponential solution and a wave-like one. The former leads to a "microscopic" cosmological model with Hubble expansion. Due to interaction of a Higgs-like cosmological potential, the original time-space symmetry is spontaneously broken, inducing a strong time-like curvature and a weak space-like deviation curve. In the result, the wave-like solution leads to Klein-Gordon-Fock equation which would serve an explicit approach

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Benavent-Nácher, Sergio, Pedro Rosado Castellano, and Fernando Romero Subirón. "SysML4GDPSim: A SysML Profile for Modeling Geometric Deviation Propagation in Multistage Manufacturing Systems Simulation." Applied Sciences 14, no. 5 (2024): 1830. http://dx.doi.org/10.3390/app14051830.

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In recent years, paradigms like production quality or zero-defect manufacturing have emerged, highlighting the need to improve quality and reduce waste in manufacturing systems. Although quality can be analyzed from various points of view during different stages of a manufacturing system’s lifecycle, this research focuses on a multidomain simulation model definition oriented toward the analysis of productivity and geometric quality during early design stages. To avoid inconsistencies, the authors explored the definition of descriptive models using system modeling language (SysML) profiles that

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Kang, Hehe, and Zhi-Min Li. "Assembly research of aero-engine casing involving bolted connection based on rigid-compliant coupling assembly deviation modeling." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 234, no. 14 (2020): 2803–20. http://dx.doi.org/10.1177/0954406220910455.

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Assembly analysis is necessary for mechanical product to optimize design and improve the product quality since assembly deviation is the key factor affecting the assembly quality. In this paper, the rigid-compliant assembly of thin-walled aero-engine casing is studied to evaluate the assembly quality at the design stage. First, the Jacobian–Torsor model is proposed to construct multistage casing assembly owing to its effectiveness to express assembly deviation. The torsor expression is modified and expanded to present the rigid-compliant coupling tolerance. Then, the partial parallel chain is

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Mitić, Jelena, Nikola Vitković, Miroslav Trajanović, et al. "Utilizing Artificial Neural Networks for Geometric Bone Model Reconstruction in Mandibular Prognathism Patients." Mathematics 12, no. 10 (2024): 1577. http://dx.doi.org/10.3390/math12101577.

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Patient-specific 3D models of the human mandible are finding increasing utility in medical fields such as oral and maxillofacial surgery, orthodontics, dentistry, and forensic sciences. The efficient creation of personalized 3D bone models poses a key challenge in these applications. Existing solutions often rely on 3D statistical models of human bone, offering advantages in rapid bone geometry adaptation and flexibility by capturing a range of anatomical variations, but also a disadvantage in terms of reduced precision in representing specific shapes. Considering this, the proposed parametric

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Mesri, Yaser, Hamid Niazmand, Amin Deyranlou, and Mahmood Reza Sadeghi. "Fluid-structure interaction in abdominal aortic aneurysms: Structural and geometrical considerations." International Journal of Modern Physics C 26, no. 04 (2015): 1550038. http://dx.doi.org/10.1142/s0129183115500382.

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Rupture of the abdominal aortic aneurysm (AAA) is the result of the relatively complex interaction of blood hemodynamics and material behavior of arterial walls. In the present study, the cumulative effects of physiological parameters such as the directional growth, arterial wall properties (isotropy and anisotropy), iliac bifurcation and arterial wall thickness on prediction of wall stress in fully coupled fluid-structure interaction (FSI) analysis of five idealized AAA models have been investigated. In particular, the numerical model considers the heterogeneity of arterial wall and the iliac

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Gehring, Tim, Santiago Eizaguirre, Qihao Jin, Jan Dycke, Manuel Renschler, and Rainer Kling. "On the Temperature and Plasma Distribution of an Inductively Driven Xe-I2-Discharge." Plasma 4, no. 4 (2021): 745–54. http://dx.doi.org/10.3390/plasma4040037.

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Inductively Coupled Plasma (ICP) discharges are part of intense research. Predicting different plasma parameters, like the distribution and temperature of the present species, is of great interest for many applications. Iodine- or halide-containing plasmas in particular have an important function, for example, in the development of mercury-free UV radiation sources. Therefore, a 2D simulation model of a xenon- and iodine-containing ICP was created by using the Finite Element Method (FEM) software COMSOL Multiphysics®. The included species and the used reactions are presented in this paper. To

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Guo, Dongyu, Jiwen Cui, and Yuhang Wu. "Linear-Structured-Light Measurement System Based on Scheimpflug Camera Thick-Lens Imaging." Sensors 24, no. 16 (2024): 5124. http://dx.doi.org/10.3390/s24165124.

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A thick-lens, structured-light measurement model is introduced to overcome the oversights in traditional models, which often disregard the impact of lens thickness. This oversight can lead to inaccuracies in Scheimpflug camera calculations, causing systematic errors and diminished measurement precision. By geometrical optics, the model treats the camera as a thick lens, factoring in the locations of its principal points and the spatial shifts due to image plane tilting. The model deduces the positional relationship of the thick lens with a tilted optical axis and establishes a linear-structure

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Shu, Q., L. Wang, and K. C. Chou. "Estimation of viscosity for some silicate ternary slags." Journal of Mining and Metallurgy, Section B: Metallurgy 50, no. 2 (2014): 139–44. http://dx.doi.org/10.2298/jmmb130218014s.

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A new method, combining KTH model with geometrical model (General solution model by Chou) to estimate viscosity of some ternary silicate slags, was proposed in this work. According to modified KTH model, viscous Gibbs free energy for mixing of ternary slags was estimated by employing general solution model. It was found that viscous Gibbs energy for mixing of ternary system could be calculated using solely viscous Gibbs energy for mixing of sub-binary systems. The viscosities of five ternary slags CaO-MnO-SiO2, CaO-FeO-SiO2, FeO-MnO-SiO2, CaO-MgO-SiO2 and FeO-MgO-SiO2 were estimated in the pre

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Budzik, Grzegorz, Paweł Turek, Tomasz Dziubek, and Michał Gdula. "Elaboration of the measuring procedure facilitating precision assessment of the geometry of mandible anatomical model manufactured using additive methods." Measurement and Control 53, no. 1-2 (2019): 181–91. http://dx.doi.org/10.1177/0020294019881708.

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This article presents a procedure for minimizing ATOS II Triple Scan system measurement errors during the verification of geometrical accuracy of the final lateral-mandibular condyle model. The process of manufacturing a template geometrically similar to that of lateral-mandibular condyle was performed on the five-axis machining centre 100 DMU MonoBlock. The next stage of the research was related to the implementation of the measurement system procedure on the template model, and the 12 anatomical models of the mandibular body-condyle were manufactured using five different additive methods. As

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Xiao, Zhaofei, Xiaoling Liu, Lee T. Harper, Andreas Endruweit, and Nicholas A. Warrior. "Modelling the permeability of random discontinuous carbon fibre preforms." Journal of Composite Materials 54, no. 20 (2020): 2739–51. http://dx.doi.org/10.1177/0021998320902506.

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A force-directed algorithm was developed to create representative geometrical models of fibre distributions in directed carbon fibre preforms. Local permeability values were calculated for the preform models depending on the local fibre orientation, distribution and volume fraction. The effect of binder content was incorporated by adjusting the principal permeability values of the meso-scale discontinuous fibre bundles, using corresponding experimental data obtained for unidirectional non-crimp fabrics. The model provides an upper boundary for the permeability of directed carbon fibre preform

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Pucci, Micol, Stefania Zanforlin, Debora Bellafiore, Stefano Deluca, and Georg Umgiesser. "A Double Multiple Stream Tube (DMST) routine for site assessment to select efficient turbine aspect ratios and solidities in real marine environments." E3S Web of Conferences 312 (2021): 08001. http://dx.doi.org/10.1051/e3sconf/202131208001.

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A MATLAB routine, based on a Double Multiple Stream Tube model, developed to quickly predict the performance of cross-flow hydrokinetic turbine, here is presented. The routine evaluate flow data obtained with the open-source marine circulation code SHYFEM. The tool can establish the best locations to place tidal devices taking into account bathymetric constraints and the hydrokinetic potential. Hence, it can be used to decide the best set of geometrical parameters. The geometrical variables of our analysis are turbine frontal area, aspect ratio and solidity. Several sub-models, validated with

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Chen, Jian, Xiao Zhang, Cong Li, et al. "Calculation Method of Specific Surface Area of Foam Metal Based on an Ideal Tetradecahedron Model for Lithium Ion Battery." International Journal of Photoenergy 2020 (January 28, 2020): 1–7. http://dx.doi.org/10.1155/2020/2478579.

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A novel calculation method of specific surface area of tetrahedral foam metal is established. The expressions of the two basic parameters of the foam metal with respect to porosity and pore size are derived by using the geometrical relationship of this model; consequently, the specific surface area of the metal foam is easily calculated. The theoretical calculation data are compared with the experimental results; it shows that the specific surface area of various porous metals, such as nickel foam and copper foam prepared by electrodeposition and aluminum foam produced by high-pressure infiltr

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