Увійти

Готові списки джерел за темами / Dimensional and geometrical precision / Статті в журналах

Щоб переглянути інші типи публікацій з цієї теми, перейдіть за посиланням: Dimensional and geometrical precision.

Статті в журналах з теми "Dimensional and geometrical precision"

Автор: Grafiati

Опубліковано: 11 березня 2023

Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями

Оберіть тип джерела:

Ознайомтеся з топ-50 статей у журналах для дослідження на тему "Dimensional and geometrical precision".

Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.

Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.

Переглядайте статті в журналах для різних дисциплін та оформлюйте правильно вашу бібліографію.

1

Liu, Junfeng, Yuqian Zhao, Tao Lai, Fei Li, and Kexian Liu. "Identification of Geometrical Error on Multi-Axis Machine Tools Based on a Laser Tracker." Journal of Physics: Conference Series 2185, no. 1 (2022): 012008. http://dx.doi.org/10.1088/1742-6596/2185/1/012008.

Повний текст джерела

Анотація:

Abstract The geometrical errors are affected by many factors for a multi-axis machine tool, such as materials, manufacturing, assembly, measurement, control, and environmental. The geometric error will eventually be reflected in the accuracy of the workpiece; therefore, for each part of the machine tool, the measurement of geometric error is essential. Most geometrical errors are measured separately for each axis. The single geometrical error measurement method is time-consuming. The multiple geometric error measurement methods have some limitations based on different instruments. Laser tracke

Стилі APA, Harvard, Vancouver, ISO та ін.

2

Cristofolini, Ilaria, Melania Pilla, Andrea Rao, Stefano Libardi, and Alberto Molinari. "Dimensional and geometrical precision of powder metallurgy parts sintered and sinterhardened at high temperature." International Journal of Precision Engineering and Manufacturing 14, no. 10 (2013): 1735–42. http://dx.doi.org/10.1007/s12541-013-0233-5.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

3

Relea, Eduard, Lukas Weiss, and Konrad Wegener. "Experimental Study on the Geometrical and Dimensional Stability of Natural Stone Sorts for Precision Machinery." Procedia CIRP 80 (2019): 89–94. http://dx.doi.org/10.1016/j.procir.2019.01.107.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

4

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.

Повний текст джерела

Анотація:

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

Стилі APA, Harvard, Vancouver, ISO та ін.

5

Battey, H. S., and D. R. Cox. "High dimensional nuisance parameters: an example from parametric survival analysis." Information Geometry 3, no. 2 (2020): 119–48. http://dx.doi.org/10.1007/s41884-020-00030-6.

Повний текст джерела

Анотація:

AbstractParametric statistical problems involving both large amounts of data and models with many parameters raise issues that are explicitly or implicitly differential geometric. When the number of nuisance parameters is comparable to the sample size, alternative approaches to inference on interest parameters treat the nuisance parameters either as random variables or as arbitrary constants. The two approaches are compared in the context of parametric survival analysis, with emphasis on the effects of misspecification of the random effects distribution. Notably, we derive a detailed expressio

Стилі APA, Harvard, Vancouver, ISO та ін.

6

Monroy, Karla, Jordi Delgado, Lidia Sereno, Joaquim Ciurana, and Nicolas J. Hendrichs. "Geometrical feature analysis of Co-Cr-Mo single tracks after selective laser melting processing." Rapid Prototyping Journal 21, no. 3 (2015): 287–300. http://dx.doi.org/10.1108/rpj-11-2013-0122.

Повний текст джерела

Анотація:

Purpose – Therefore, the purpose of this study is to understand the relationships between the processing parameters and the geometric form of the produced single tracks, in order to control dimensional quality in future experimentations. The quality of the deposited single track and layer is of prime importance in the selective laser melting (SLM) process, as it affects the product quality in terms of dimensional precision and product performance. Design/methodology/approach – In this paper, a vertical milling machining center equipped with an Ytterbium-fiber laser was used in the SLM experime

Стилі APA, Harvard, Vancouver, ISO та ін.

7

Ji, H. Z., L. Yuan, and D. B. Shan. "Study on geometrical and dimensional changes in isothermal precision forging with complex shape during air cooling process." Materials Research Innovations 15, sup1 (2011): s466—s469. http://dx.doi.org/10.1179/143307511x12858957675831.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

8

Ueng, Shyh-Kuang, Hsin-Cheng Huang, Chieh-Shih Chou, and Hsuan-Kai Huang. "Layered manufacturing for medical imaging data." Advances in Mechanical Engineering 11, no. 8 (2019): 168781401987139. http://dx.doi.org/10.1177/1687814019871392.

Повний текст джерела

Анотація:

Layered manufacturing techniques have been successfully employed to construct scanned objects from three-dimensional medical image data sets. The printed physical models are useful tools for anatomical exploration, surgical planning, teaching, and related medical applications. Before fabricating scanned objects, we have to first build watertight geometrical representations of the target objects from medical image data sets. Many algorithms had been developed to fulfill this duty. However, some of these methods require extra efforts to resolve ambiguity problems and to fix broken surfaces. Othe

Стилі APA, Harvard, Vancouver, ISO та ін.

9

FANG, CHONGHUA, QIAN LIU, and XIAONAN ZHAO. "IMPROVED INTEGRATED MODEL OF ELECTROMAGNETIC SCATTERING FOR TWO DIMENSIONAL FRACTAL SEA SURFACE." International Journal of Modern Physics B 24, no. 22 (2010): 4217–24. http://dx.doi.org/10.1142/s0217979210056542.

Повний текст джерела

Анотація:

In this paper, an improved integrated model of electromagnetic scattering for two dimensional fractal sea surface is built. Both geometrical fractal characteristic and permittivity characteristic of sea water are strictly considered, especially for the effects of salinity and temperature on the electromagnetic field scattered by sea water are added on. Finally, the calculated results from the new model are in accord with experimental results in terms of backscattering coefficient of sea water with no more than 2 dB error, which present higher precision than those traditional models. Thus, by u

Стилі APA, Harvard, Vancouver, ISO та ін.

10

Abeni, Andrea, Alessandro Metelli, Cristian Cappellini, and Aldo Attanasio. "Experimental Optimization of Process Parameters in CuNi18Zn20 Micromachining." Micromachines 12, no. 11 (2021): 1293. http://dx.doi.org/10.3390/mi12111293.

Повний текст джерела

Анотація:

Ultraprecision micromachining is a technology suitable to fabricate miniaturized and complicated 3-dimensional microstructures and micromechanisms. High geometrical precision and elevated surface finishing are both key requirements in several manufacturing sectors. Electronics, biomedicals, optics and watchmaking industries are some of the fields where micromachining finds applications. In the last years, the integration between product functions, the miniaturization of the features and the increasing of geometrical complexity are trends which are shared by all the cited industrial sectors. Th

Стилі APA, Harvard, Vancouver, ISO та ін.

11

Hajiahmadi, Saeed, Majid Elyasi, and Mohsen Shakeri. "Evaluation of drawing force by a new dimensionless method in deep drawing process." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 234, no. 13 (2020): 1604–14. http://dx.doi.org/10.1177/0954405420929770.

Повний текст джерела

Анотація:

In this research, geometric parameters were given in dimensionless form by the Π- Buckingham dimensional analysis method in the dimensionless group for deep drawing of a round cup. To find the best group of dimensionless parameters and the fittest dimensionless relational model, three scales of the cup are evaluated numerically by a commercial finite element software and stepwise regression modeling. After analyzing all effective geometric parameters, a fittest relational model among dimensionless parameters is found. In addition, the results of the new dimensionless model were compared with t

Стилі APA, Harvard, Vancouver, ISO та ін.

12

Toledo, D., I. Cristofolini, A. Molinari, et al. "High temperature sintering and its effect on dimensional and geometrical precision and on microstructure of low alloyed steels." Powder Metallurgy 63, no. 2 (2020): 80–93. http://dx.doi.org/10.1080/00325899.2020.1723883.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

13

Zhang, Jiao, and Jianfeng Lu. "Analytical evaluation of geometric dilution of precision for three-dimensional angle-of-arrival target localization in wireless sensor networks." International Journal of Distributed Sensor Networks 16, no. 5 (2020): 155014772092047. http://dx.doi.org/10.1177/1550147720920471.

Повний текст джерела

Анотація:

This article focuses on the evaluation of geometric dilution of precision for three-dimensional angle-of-arrival target localization in wireless sensor networks. We calculate a general analytical expression for the geometric dilution of precision for three-dimensional angle-of-arrival target localization. Unlike the existing works in the literature, in this article, no assumptions are made regarding the observation ranges, noise variances, or the number of sensors in the derivation of the geometric dilution of precision. Necessary and sufficient conditions regarding the existence of geometric

Стилі APA, Harvard, Vancouver, ISO та ін.

14

Cox, Daniel J., Glynn Newby, Hyung Wook Park, et al. "Precision Machining with Micro-Scale Vertical Machining Center." Journal of Advanced Computational Intelligence and Intelligent Informatics 10, no. 2 (2006): 187–95. http://dx.doi.org/10.20965/jaciii.2006.p0187.

Повний текст джерела

Анотація:

Micro machining is an emerging technology with extremely large benefits and equally great challenges. The push to develop processes and tools capable of micro scale fabrication results from the widespread drive to reduce part and feature size in many industrial and commercial sectors. For many micro machining applications, the technology of mechanical solid tool machining offers attractive merits as it can create truly three-dimensional and one-of-a-kind parts of extremely high resolutions without significant limitation of part materials. For mechanical solid tool machining, the control of thr

Стилі APA, Harvard, Vancouver, ISO та ін.

15

Ebrahimi, Mahmoud, Kamal Hamed Tabei, Reza Naseri, and Faramarz Djavanroodi. "Effect of flow-forming parameters on surface quality, geometrical precision and mechanical properties of titanium tube." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 232, no. 6 (2017): 702–8. http://dx.doi.org/10.1177/0954408917738126.

Повний текст джерела

Анотація:

In this study, the flow-forming process for fabricating seamless thin-wall tubes is experimentally investigated on a commercially pure titanium sample. For this purpose, the influence of three processing parameters including feed rate, mandrel revolution, and thickness reduction is studied on the surface quality and geometrical accuracy of flow-formed tube. It is found that the feed rate increment results in more longitudinal displacement of the roller on the tube sample. This intern results in, more area of the material to be in contact with the roller during the tube revolution; hence, highe

Стилі APA, Harvard, Vancouver, ISO та ін.

16

Ma, Hai Long, Ai Jun Tang, and Qing Kui Chen. "Dynamic Models of Stability Lobes of Milling Thin-Walled Plates." Advanced Materials Research 443-444 (January 2012): 622–27. http://dx.doi.org/10.4028/www.scientific.net/amr.443-444.622.

Повний текст джерела

Анотація:

In the process of milling thin-walled plate, chatter is one of the major limitations on productivity and part quality even for high speed and high precision milling machines. Therefore, it is necessary to avoid chatter with a suitable choice of cutting condition. This paper studies the dynamic stability models of milling the thin-walled plate by analyzing the geometrical relationship of cutting, and derives the mathematic expressions in theory. Moreover, this paper develops a three-dimensional lobes diagram of the spindle speed, the axial depth and the radial depth. Through the three-dimension

Стилі APA, Harvard, Vancouver, ISO та ін.

17

Ma, Hai Long, Ai Jun Tang, and Qing Kui Chen. "Stability Prediction Model for Milling Process." Advanced Materials Research 490-495 (March 2012): 2829–33. http://dx.doi.org/10.4028/www.scientific.net/amr.490-495.2829.

Повний текст джерела

Анотація:

In the process of milling thin-walled plate, chatter is one of the major limitations on productivity and part quality even for high speed and high precision milling machines. Therefore, it is necessary to avoid chatter with a suitable choice of cutting condition. This paper studies the dynamic stability models of milling the thin-walled plate by analyzing the geometrical relationship of cutting, and derives the mathematic expressions in theory. Moreover, this paper develops a three-dimensional lobes diagram of the spindle speed, the axial depth and the radial depth. Through the three-dimension

Стилі APA, Harvard, Vancouver, ISO та ін.

18

Tan, Hai, Dadong Wang, Rongxin Li, et al. "A robust method for high-precision quantification of the complex three-dimensional vasculatures acquired by X-ray microtomography." Journal of Synchrotron Radiation 23, no. 5 (2016): 1216–26. http://dx.doi.org/10.1107/s1600577516011498.

Повний текст джерела

Анотація:

The quantification of micro-vasculatures is important for the analysis of angiogenesis on which the detection of tumor growth or hepatic fibrosis depends. Synchrotron-based X-ray computed micro-tomography (SR-µCT) allows rapid acquisition of micro-vasculature images at micrometer-scale spatial resolution. Through skeletonization, the statistical features of the micro-vasculature can be extracted from the skeleton of the micro-vasculatures. Thinning is a widely used algorithm to produce the vascular skeleton in medical research. Existing three-dimensional thinning methods normally emphasize the

Стилі APA, Harvard, Vancouver, ISO та ін.

19

Zhu, Linlin, Yuchu Dong, Zexiao Li, Xiaodong Zhang, and Fengzhou Fang. "Measurement and Analysis of the Stepwise Curved Surface of Diffractive Optical Elements by a Constant Speed Confocal Probe." Applied Sciences 9, no. 11 (2019): 2229. http://dx.doi.org/10.3390/app9112229.

Повний текст джерела

Анотація:

Diffractive optical elements (DOEs) play an important role in improving imaging quality and reducing system volume. The measurement of DOE surface topography is of great significance to the evaluation of DOE quality and the optimization of its manufacturing process. However, there are still some difficulties in measuring the large curvature and the large sag of curve-based DOEs. In this paper, considering the geometrical feature information and measurement problems of curve-based DOEs, a measurement method based on a confocal measurement principle for DOE measurement is proposed. The proposed

Стилі APA, Harvard, Vancouver, ISO та ін.

20

Zago, Marco, Nora Francesca Maria Lecis, Maurizio Vedani, and Ilaria Cristofolini. "Dimensional and geometrical precision of parts produced by binder jetting process as affected by the anisotropic shrinkage on sintering." Additive Manufacturing 43 (July 2021): 102007. http://dx.doi.org/10.1016/j.addma.2021.102007.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

21

Budwal, Nikita, Kent Kasper, Jon Goering, and Carwyn Ward. "Tooling and Infusion Design Strategies to Reduce Trade-Offs in Forming and Infusion Quality of Multi-Textile CFRPs." Journal of Manufacturing and Materials Processing 6, no. 3 (2022): 62. http://dx.doi.org/10.3390/jmmp6030062.

Повний текст джерела

Анотація:

Achieving right-first-time-manufacture (RFTM) of co-infused textile assemblies is challenging, without improving the accessibility to design knowledge of trade-offs between different tooling and infusion strategies. As demonstrated in previous work, the choice between a flexible or rigid mould material can result in trade-offs between dimensional accuracy and geometrical precision. Similarly, the choice of an infusion strategy can result in trade-offs in infusion quality and time. Building on past work, an investigation into forming variability across the length of six co-infused multi-textile

Стилі APA, Harvard, Vancouver, ISO та ін.

22

Fu, Yue Gang, and Fan Hao Jin. "A High-Precision Binocular Measurement System." Advanced Materials Research 823 (October 2013): 402–5. http://dx.doi.org/10.4028/www.scientific.net/amr.823.402.

Повний текст джерела

Анотація:

The system uses three-dimensional measurement of binocular vision theory, through optical, mechanical, computer and other aspects of the technology to measure the target without contact, and up to a certain precision. In the high-voltage area, high-altitude target,and the target which is not easy to touch, there is a unique measure advantage. Binocular stereo vision is based on the principle of parallax and using imaging devices from different locations to obtain two images of the measured object and obtain three dimensional geometric of target by positional deviation between corresponding poi

Стилі APA, Harvard, Vancouver, ISO та ін.

23

Badanova, Nazym, Asma Perveen, and Didier Talamona. "Study of SLA Printing Parameters Affecting the Dimensional Accuracy of the Pattern and Casting in Rapid Investment Casting." Journal of Manufacturing and Materials Processing 6, no. 5 (2022): 109. http://dx.doi.org/10.3390/jmmp6050109.

Повний текст джерела

Анотація:

Dimensional accuracy and geometric characteristics of the manufactured parts bear significant importance in product assembly. In Rapid Investment Casting, these characteristics can be affected by the printing parameters of the Additive Manufacturing method used in the pattern production process. Stereolithography is one of the important AM techniques mostly exploited in RIC due to its accuracy, smooth surface, and precision. However, the effect of SLA printing parameters on the dimensional accuracy and geometric characteristics have not been studied thoroughly. This study considers an experime

Стилі APA, Harvard, Vancouver, ISO та ін.

24

Park, Y. B., and D. Y. Yang. "Finite element analysis for precision cold forging of helical gear using recurrent boundary conditions." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 212, no. 3 (1998): 231–40. http://dx.doi.org/10.1243/0954405981515644.

Повний текст джерела

Анотація:

In metal forming, there are problems with recurrent geometric characteristics without explicitly prescribed boundary conditions. In such problems, so-called recurrent boundary conditions must be introduced. In this paper, as a practical application of the proposed method, the precision cold forging of a helical gear (which is industrially useful and geometrically complicated) has been simulated by a three-dimensional rigid-plastic finite element method and compared with the experiment. The application of recurrent boundary conditions to helical gear forging analysis is proved to be effective a

Стилі APA, Harvard, Vancouver, ISO та ін.

25

Du, Fuzhou, Ke Wen, and Hao Yu. "A self-adaptive alignment strategy for large components based on dynamic compliance center." Assembly Automation 39, no. 2 (2019): 345–55. http://dx.doi.org/10.1108/aa-04-2018-057.

Повний текст джерела

Анотація:

PurposeAiming at the problems of geometric precision misalignment and unconsidered physical constraints between large components during the measurement-assisted assembly, a self-adaptive alignment strategy based on the dynamic compliance center (DCC) is proposed in this paper, using force information to guide alignment compliantly.Design/methodology/approachFirst, the self-adaptive alignment process of large components is described, and its geometrical and mechanical characteristics are analyzed based on six-dimensional force/torque (F/T). The setting method of DCC is studied and the areas of

Стилі APA, Harvard, Vancouver, ISO та ін.

26

Fang, Guodong, and Jun Liang. "A review of numerical modeling of three-dimensional braided textile composites." Journal of Composite Materials 45, no. 23 (2011): 2415–36. http://dx.doi.org/10.1177/0021998311401093.

Повний текст джерела

Анотація:

Three-dimensional (3D) braided composites with high specific energy absorption behavior and excellent fatigue performances are widely used in structures under cycle or impact load. A comprehensive literature survey is conducted to review the numerical analysis methods of 3D braided composites, including meso-geometry modeling, mesh generation techniques, and progressive damage models. When the 3D braided composites are manufactured during a process cycle, the braid yarn can move and becomes a ‘deviated or imperfect’ architecture. Elaborate meso-geometrical models which directly influence the p

Стилі APA, Harvard, Vancouver, ISO та ін.

27

Saariluoma, Heikki, Aki Piiroinen, Anna Unt, Jukka Hakanen, Tuomo Rautava, and Antti Salminen. "Overview of Optical Digital Measuring Challenges and Technologies in Laser Welded Components in EV Battery Module Design and Manufacturing." Batteries 6, no. 3 (2020): 47. http://dx.doi.org/10.3390/batteries6030047.

Повний текст джерела

Анотація:

Ensuring the precision and repeatability of component assembly in the production of electric vehicle (EV) battery modules requires fast and accurate measuring methods. The durability of EV battery packs depends on the quality of welded connections, therefore exact positioning of the module components is critical for ensuring safety in exploitation. Laser welding is a non-contact process capable of welding dissimilar materials with high precision, for that reason it has become the preferred joining method in battery production. In high volume manufacturing, one of the main production challenges

Стилі APA, Harvard, Vancouver, ISO та ін.

28

Wang, Zheng Ru, Qing Ping Zhang, Cheng Wang, and Gao Xiang Cai. "Parametric Design System of Precision Forging Gear Die." Advanced Materials Research 712-715 (June 2013): 1153–57. http://dx.doi.org/10.4028/www.scientific.net/amr.712-715.1153.

Повний текст джерела

Анотація:

Powerful function in three-dimensional design, SolidWorks now has found a wide range of applications in industrial design. The parametric design system of precision forging gear die in this paper is developed with VB language based on SolidWorks environment. It is described in detail that the establishment of important components of gear die in the three-dimensional model, the relation between parameters of the interface and model, and parameters drive mechanism. Input parameters in windows of VB interface, are automatically calculated the precise parameters of the gear part and geometric dime

Стилі APA, Harvard, Vancouver, ISO та ін.

29

Jeong, J., and I. Lee. "CLASSIFICATION OF LIDAR DATA FOR GENERATING A HIGH-PRECISION ROADWAY MAP." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B3 (June 9, 2016): 251–54. http://dx.doi.org/10.5194/isprs-archives-xli-b3-251-2016.

Повний текст джерела

Анотація:

Generating of a highly precise map grows up with development of autonomous driving vehicles. The highly precise map includes a precision of centimetres level unlike an existing commercial map with the precision of meters level. It is important to understand road environments and make a decision for autonomous driving since a robust localization is one of the critical challenges for the autonomous driving car. The one of source data is from a Lidar because it provides highly dense point cloud data with three dimensional position, intensities and ranges from the sensor to target. In this paper,

Стилі APA, Harvard, Vancouver, ISO та ін.

30

Jeong, J., and I. Lee. "CLASSIFICATION OF LIDAR DATA FOR GENERATING A HIGH-PRECISION ROADWAY MAP." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B3 (June 9, 2016): 251–54. http://dx.doi.org/10.5194/isprsarchives-xli-b3-251-2016.

Повний текст джерела

Анотація:

Generating of a highly precise map grows up with development of autonomous driving vehicles. The highly precise map includes a precision of centimetres level unlike an existing commercial map with the precision of meters level. It is important to understand road environments and make a decision for autonomous driving since a robust localization is one of the critical challenges for the autonomous driving car. The one of source data is from a Lidar because it provides highly dense point cloud data with three dimensional position, intensities and ranges from the sensor to target. In this paper,

Стилі APA, Harvard, Vancouver, ISO та ін.

31

Zhang, Yun Jiao, Guo Wu Wei, and Jian Sheng Dai. "The Analysis of a Simplified 2R Pseudo-Rigid-Body Model with Moment Load." Applied Mechanics and Materials 224 (November 2012): 18–23. http://dx.doi.org/10.4028/www.scientific.net/amm.224.18.

Повний текст джерела

Анотація:

Pseudo-rigid-body model (PRBM) method, which simplifies the geometrical nonlinear analysis, has become an important tool for the analysis and synthesis of compliant mechanisms. In this paper, a simplified 2R PRBM with two rigid links and two torsion springs is proposed. The characteristic radius factor and stiffness coefficients are selected as the design variables; in order to be better to simulate the tip point and tip slope, a three-dimensional objective function is formulated to optimize the new pseudo-rigid-body model. It is revealed in this paper that the precision of the tip point simul

Стилі APA, Harvard, Vancouver, ISO та ін.

32

Gallenne, A., G. Pietrzyński, D. Graczyk, et al. "The Araucaria project: High-precision orbital parallax and masses of eclipsing binaries from infrared interferometry." Astronomy & Astrophysics 632 (November 22, 2019): A31. http://dx.doi.org/10.1051/0004-6361/201935837.

Повний текст джерела

Анотація:

Context. The precise determinations of stellar mass at ≲1% provide important constraints on stellar evolution models. Accurate parallax measurements can also serve as independent benchmarks for the next Gaia data release. Aims. We measured the masses and distance of binary systems with a precision level better than 1% using a fully geometrical and empirical method. Methods. We obtained the first interferometric observations for the eclipsing systems AI Phe, AL Dor, KW Hya, NN Del, ψ Cen and V4090 Sgr with the VLTI/PIONIER combiner, which we combined with radial velocity measurements to derive

Стилі APA, Harvard, Vancouver, ISO та ін.

33

Vonk, N. H., N. A. M. Verschuur, R. H. J. Peerlings, M. G. D. Geers, and J. P. M. Hoefnagels. "Robust and precise identification of the hygro-expansion of single fibers: a full-field fiber topography correlation approach." Cellulose 27, no. 12 (2020): 6777–92. http://dx.doi.org/10.1007/s10570-020-03180-z.

Повний текст джерела

Анотація:

Abstract Over the past decades, natural fibers have become an important constituent in multiple engineering- and biomaterials. Their high specific strength, biodegradability, low-cost production, recycle-ability, vast availability and easy processing make them interesting for many applications. However, fiber swelling due to moisture uptake poses a key challenge, as it significantly affects the geometric stability and mechanical properties. To characterize the hygro-mechanical behavior of fibers in detail, a novel micromechanical characterization method is proposed which allows continuous full

Стилі APA, Harvard, Vancouver, ISO та ін.

34

Adamopoulos, Efstathios, Fulvio Rinaudo, and Liliana Ardissono. "A Critical Comparison of 3D Digitization Techniques for Heritage Objects." ISPRS International Journal of Geo-Information 10, no. 1 (2020): 10. http://dx.doi.org/10.3390/ijgi10010010.

Повний текст джерела

Анотація:

Techniques for the three-dimensional digitization of tangible heritage are continuously updated, as regards active and passive sensors, data acquisition approaches, implemented algorithms and employed computational systems. These developments enable higher automation and processing velocities, increased accuracy, and precision for digitizing heritage assets. For large-scale applications, as for investigations on ancient remains, heritage objects, or architectural details, scanning and image-based modeling approaches have prevailed, due to reduced costs and processing durations, fast acquisitio

Стилі APA, Harvard, Vancouver, ISO та ін.

35

Schlögl, S., U. Mäder, M. Luster, M. Lassmann, P. Andermann, and Chr Reiners. "Intra- and interobserver variability of thyroid volume measurements in healthy adults by 2D versus 3D ultrasound." Nuklearmedizin 46, no. 01 (2007): 01–07. http://dx.doi.org/10.1055/s-0037-1616621.

Повний текст джерела

Анотація:

SummaryThyroid volume measurement by ultrasonography (US) is essential in numerous clinical diagnostic and therapeutic fields. While known to be limited, the accuracy and precision of two-dimensional (2D) US thyroid volume measurement have not been thoroughly characterized. Objective: We sought to assess the intra- and interobserver variability, accuracy and precision of thyroid volume determination by conventional 2D US in healthy adults using reference volumes determined by three-dimensional (3D) US. Design, methods: In a prospective blinded trial, thyroid volumes of ten volunteers were dete

Стилі APA, Harvard, Vancouver, ISO та ін.

36

FOUNTAIN, G. O., D. V. KHAKHAR, I. MEZIĆ, and J. M. OTTINO. "Chaotic mixing in a bounded three-dimensional flow." Journal of Fluid Mechanics 417 (August 25, 2000): 265–301. http://dx.doi.org/10.1017/s002211200000118x.

Повний текст джерела

Анотація:

Even though the first theoretical example of chaotic advection was a three-dimensional flow (Hénon 1966), the number of theoretical studies addressing chaos and mixing in three-dimensional flows is small. One problem is that an experimentally tractable three-dimensional system that allows detailed experimental and computational investigation had not been available. A prototypical, bounded, three-dimensional, moderate-Reynolds-number flow is presented; this system lends itself to detailed experimental observation and allows high-precision computational inspection of geometrical and dynamical ef

Стилі APA, Harvard, Vancouver, ISO та ін.

37

Zhao, Wu, and Guo Ji Wang. "Analysis Geometric Precision of Workpiece and Geometric Errors Model of 5-Axis Machining Center for Processing Turbo Molecular Pump Rotor." Advanced Materials Research 305 (July 2011): 423–27. http://dx.doi.org/10.4028/www.scientific.net/amr.305.423.

Повний текст джерела

Анотація:

The research investigates two kinds basic problems during the precision processing about turbo molecular pump rotor using 5-axis machining center. The one is to study the geometric and dimensional precision of turbo molecular pump rotor. The other one is to study the accuracy evaluative factors of 5-axis turbo molecular pump rotor machining center. For improving the processing precision to ensure the dynamic symmetry and geometric symmetry of the turbo molecular pump rotor, it focus on analyzing the allowable deviations from the turbo molecular pump rotor’s nominal geometry and dimensions spec

Стилі APA, Harvard, Vancouver, ISO та ін.

38

Elkaseer, Ahmed, Stella Schneider, Yaqi Deng, and Steffen G. Scholz. "Effect of Process Parameters on the Performance of Drop-On-Demand 3D Inkjet Printing: Geometrical-Based Modeling and Experimental Validation." Polymers 14, no. 13 (2022): 2557. http://dx.doi.org/10.3390/polym14132557.

Повний текст джерела

Анотація:

As additive manufacturing has evolved, 3D inkjet printing (IJP) has become a promising alternative manufacturing method able to manufacture functional multi-material parts in a single process. However, issues with part quality in terms of dimensional errors and lack of precision still restrict its industrial and commercial applications. This study aims at improving the dimensional accuracy of 3D IJP parts by developing an optimization-oriented simulation tool of droplet behavior during the drop-on-demand 3D IJP process. The simulation approach takes into consideration the effect of droplet vol

Стилі APA, Harvard, Vancouver, ISO та ін.

39

Zhang, Xi, Yuanzhi Xu, Haichao Li, Lijing Zhu, Xin Wang, and Wei Li. "Flexible method for accurate calibration of large-scale vision metrology system based on virtual 3-D targets and laser tracker." International Journal of Advanced Robotic Systems 16, no. 6 (2019): 172988141989351. http://dx.doi.org/10.1177/1729881419893516.

Повний текст джерела

Анотація:

For the purpose of obtaining high-precision in stereo vision calibration, a large-size precise calibration target, which can cover more than half of the field of view is vital. However, large-scale calibration targets are very difficult to fabricate. Based on the idea of error tracing, a high-precision calibration method for vision system with large field of view by constructing a virtual 3-D calibration target with a laser tracker was proposed in this article. A virtual 3-D calibration target that covers the whole measurement space can be established flexibly and the measurement precision of

Стилі APA, Harvard, Vancouver, ISO та ін.

40

Bove, Alessandro, Flaviana Calignano, Manuela Galati, and Luca Iuliano. "Photopolymerization of Ceramic Resins by Stereolithography Process: A Review." Applied Sciences 12, no. 7 (2022): 3591. http://dx.doi.org/10.3390/app12073591.

Повний текст джерела

Анотація:

Stereolithography is known as one of the best Additive Manufacturing technologies in terms of geometrical and dimensional precision for polymeric materials. In recent years, a lot of studies have shown that the creation of ceramic resins, through a particular combination of monomeric components and ceramic powders, allows to obtain complex shape geometries thanks to the photopolymerization process. This review highlights the characteristics and properties of ceramic resins, peculiarities of the ceramic stereolithography processes, up to the relationship between the composition of the ceramic r

Стилі APA, Harvard, Vancouver, ISO та ін.

41

Cheng, Xiang, Xian Hai Yang, Li Li, and Jun Ying Liu. "Design of a Three-Axis Desktop Micro Milling Machine Tool." Key Engineering Materials 589-590 (October 2013): 735–39. http://dx.doi.org/10.4028/www.scientific.net/kem.589-590.735.

Повний текст джерела

Анотація:

Micro milling process is more favorite than other processes for its unique advantages in ultra-precision machining of miniature components with intricate three-dimensional geometrical feature made of various materials. Aiming at micro milling applications, a three-axis desktop milling machine tool with linear motors and nano-meter linear scales has been introduced. Natural granite is used as the frame material and air-bearing cylinders are used for z-axis gravity balancing. Finite element method is applied to the design and optimization of the machine structures. The designed machine adopts li

Стилі APA, Harvard, Vancouver, ISO та ін.

42

Hu, Yaoyuan, Bingfeng Ju, and Wule Zhu. "Integrated Development of a Topology-Optimized Compliant Mechanism for Precise Positioning." Actuators 11, no. 7 (2022): 179. http://dx.doi.org/10.3390/act11070179.

Повний текст джерела

Анотація:

A scheme for modelling and controlling a two-dimensional positioning system with a topology-optimized compliant mechanism is presented. The system is designed to ensure a relatively large workspace and exhibit robustness against system nonlinearities. A detailed design procedure based on topology optimization is presented, and a nonlinear description of the designed mechanism is developed as a starting point for further precise position control. The theoretical model is shown to be suitable for a considerably larger working range without losing consistency. A backstepping controller is employe

Стилі APA, Harvard, Vancouver, ISO та ін.

43

Wei, Huaxian, Li Wang, Xiaodong Niu, Jian Zhang, and Alessandro Simeone. "Fabrication, Experiments, and Analysis of an LBM Additive-Manufactured Flexure Parallel Mechanism." Micromachines 9, no. 11 (2018): 572. http://dx.doi.org/10.3390/mi9110572.

Повний текст джерела

Анотація:

Additive manufacturing technology has advantages for realizing complex monolithic structures, providing huge potential for developing advanced flexure mechanisms for precision manipulation. However, the characteristics of flexure hinges fabricated by laser beam melting (LBM) additive manufacturing (AM) are currently little known. In this paper, the fabrication and characterization of a flexure parallel mechanism through the LBM process are reported for the first time to demonstrate the development of this technique. The geometrical accuracy of the additive-manufactured flexure mechanism was ev

Стилі APA, Harvard, Vancouver, ISO та ін.

44

Asensio Ramos, A., and C. J. Díaz Baso. "Stokes inversion based on convolutional neural networks." Astronomy & Astrophysics 626 (June 2019): A102. http://dx.doi.org/10.1051/0004-6361/201935628.

Повний текст джерела

Анотація:

Context. Spectropolarimetric inversions are routinely used in the field of solar physics for the extraction of physical information from observations. The application to two-dimensional fields of view often requires the use of supercomputers with parallelized inversion codes. Even in this case, the computing time spent on the process is still very large. Aims. Our aim is to develop a new inversion code based on the application of convolutional neural networks that can quickly provide a three-dimensional cube of thermodynamical and magnetic properties from the interpreation of two-dimensional m

Стилі APA, Harvard, Vancouver, ISO та ін.

45

Farooq, Muhammad Umar, Saqib Anwar, M. Saravana Kumar, et al. "A Novel Flushing Mechanism to Minimize Roughness and Dimensional Errors during Wire Electric Discharge Machining of Complex Profiles on Inconel 718." Materials 15, no. 20 (2022): 7330. http://dx.doi.org/10.3390/ma15207330.

Повний текст джерела

Анотація:

One of the sustainability goals in the aeronautical industry includes developing cost-effective, high-performance engine components possessing complex curved geometries with excellent dimensional precision and surface quality. In this regard, several developments in wire electric discharge machining have been reported, but the influence of flushing attributes is not thoroughly investigated and is thus studied herein. The influence of four process variables, namely servo voltage, flushing pressure, nozzle diameter, and nozzle–workpiece distance, were analyzed on Inconel 718 in relation to geome

Стилі APA, Harvard, Vancouver, ISO та ін.

46

Jeon, Jin Woo, Jeong Hwan Yun, Myeong Sik Jeong, et al. "Metal Powder Injection Molding Process for Manufacturing Adapter Component." Key Engineering Materials 622-623 (September 2014): 868–75. http://dx.doi.org/10.4028/www.scientific.net/kem.622-623.868.

Повний текст джерела

Анотація:

Adapters are a component of the output system in the internally geared hub for a bicycle. Originally, adapter parts were produced by a machining process with low productivity and material usage rate. In this study, the metal powder injection molding (MIM) process has been applied as an alternative manufacturing method to the machining process. Microstructure analysis and mechanical property testing has been conducted in order to select the material for the adapter with changes in the nickel content. The geometrical precision of the adapter is measured by using three-dimensional scanner with va

Стилі APA, Harvard, Vancouver, ISO та ін.

47

de Oliveira, Fabrício Borges, Maurício de Campos Porath, Vitor Camargo Nardelli, Francisco Augusto Arenhart, and Gustavo Daniel Donatelli. "Characterization and Correction of Geometric Errors Induced by Thermal Drift in CT Measurements." Key Engineering Materials 613 (May 2014): 327–34. http://dx.doi.org/10.4028/www.scientific.net/kem.613.327.

Повний текст джерела

Анотація:

The occurrence of thermal drift in industrial computed tomography (CT) systems has been reported as a significant source of error on geometrical evaluations. During CT-scans, heating inside the cabinet and varying environmental conditions may affect the position of the focal spot and distort the manipulator system, leading to relative displacement of X-ray projections and distortions in the reconstructed 3D image. This paper presents an experimental investigation on influence of the thermal effects on dimensional CT measurements. A correction method based on the manipulation of the projections

Стилі APA, Harvard, Vancouver, ISO та ін.

48

Chang, Yun, Jia Lee, Omar Rijal, and Syed Bakar. "Efficient online handwritten Chinese character recognition system using a two-dimensional functional relationship model." International Journal of Applied Mathematics and Computer Science 20, no. 4 (2010): 727–38. http://dx.doi.org/10.2478/v10006-010-0055-x.

Повний текст джерела

Анотація:

Efficient online handwritten Chinese character recognition system using a two-dimensional functional relationship modelThis paper presents novel feature extraction and classification methods for online handwritten Chinese character recognition (HCCR). TheX-graph andY-graph transformation is proposed for deriving a feature, which shows useful properties such as invariance to different writing styles. Central to the proposed method is the idea of capturing the geometrical and topological information from the trajectory of the handwritten character using theX-graph and theY-graph. For feature siz

Стилі APA, Harvard, Vancouver, ISO та ін.

49

Zago, Marco, Nora Lecis, Marco Mariani, and Ilaria Cristofolini. "Analysis of the Flatness Form Error in Binder Jetting Process as Affected by the Inclination Angle." Metals 12, no. 3 (2022): 430. http://dx.doi.org/10.3390/met12030430.

Повний текст джерела

Анотація:

Binder jetting (BJ) has demonstrated high competitiveness among additive manufacturing processes on account of its high production rate at a low material cost. However, both the design procedure and the process for BJ have to be further developed, aiming towards the proper control of the geometrical and dimensional precision and accuracy of the final product. This paper aims to study the factors that affect the flatness form error. Five geometries were designed to obtain planes that were inclined with respect to the fabrication direction. These planes were measured by a coordinate measuring ma

Стилі APA, Harvard, Vancouver, ISO та ін.

50

Batalha, A. E. F., and R. M. Araújo. "Development of removable partial dentures by using additive manufacture and casting processes." Archives of Materials Science and Engineering 1, no. 87 (2017): 33–40. http://dx.doi.org/10.5604/01.3001.0010.5969.

Повний текст джерела

Анотація:

Purpose: This work aims to present a methodology developed for dimensional analysis of removable partial dentures, following a route with a model manufactured by additive manufacture and a further casting process of a Co-Cr alloy part. Design/methodology/approach: The method for designing and manufacturing removable partial dentures (RPD) is focused on their completely virtual design. They are manufactured with resin additive manufacturing chrome-cobalt cast alloys. A 3D image correlation scanner was used for dimensional and geometrical tolerance analysis. Findings: The prostheses manufactured

Стилі APA, Harvard, Vancouver, ISO та ін.

Ми пропонуємо знижки на всі преміум-плани для авторів, чиї праці увійшли до тематичних добірок літератури. Зв'яжіться з нами, щоб отримати унікальний промокод!