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Articoli di riviste sul tema "Virtual fields"

Autore: Grafiati

Pubblicato: 21 dicembre 2024

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1

Toussaint, Evelyne, Michel Grédiac e Fabrice Pierron. "The virtual fields method with piecewise virtual fields". International Journal of Mechanical Sciences 48, n. 3 (marzo 2006): 256–64. http://dx.doi.org/10.1016/j.ijmecsci.2005.10.002.

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Marek, Aleksander, Frances M. Davis e Fabrice Pierron. "Sensitivity-based virtual fields for the non-linear virtual fields method". Computational Mechanics 60, n. 3 (28 aprile 2017): 409–31. http://dx.doi.org/10.1007/s00466-017-1411-6.

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Tran, V., Stephane Avril e Fabrice Pierron. "Software Implementation of the Virtual Fields Method". Applied Mechanics and Materials 7-8 (agosto 2007): 57–62. http://dx.doi.org/10.4028/www.scientific.net/amm.7-8.57.

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The virtual fields method is a tool dedicated to the identification of the mechanical properties of materials from full-field deformation measurements. It is now validated in elasticity and plasticity but one of the remaining problems is the fact that researchers wanting to use the method must invest significant time in order to programme the routines. To help them, a software called CamFit has been developed. The purpose of this paper is to present this software. It is based on MATLAB® and uses a graphical pre-processing interface to produce the geometry, the conditions on the virtual fields, to choose the type of behaviour etc... Then, series of displacement maps are uploaded and the identification is launched. Since no iterative solution of the direct problem is required, computation times are very small compared to updating techniques. An important step in the procedure is the smoothing of the displacement measurements to produce strains. FE based approximations are presently available in the software. The final purpose is to introduce the software onto the market. This will be done in the very near future.

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Kravtsov, Yu A., e P. Ya Ufimtsev. "Actualization of Virtual Fields in Wave Problems". Journal of Electromagnetic Waves and Applications 3, n. 3 (1 gennaio 1989): 257–67. http://dx.doi.org/10.1163/156939389x00485.

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Griffiths, Sean. "Virtual Corpses, Figural Sections and Resonant Fields". Architectural Design 81, n. 5 (settembre 2011): 68–77. http://dx.doi.org/10.1002/ad.1296.

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Grédiac, Michel, e Fabrice Pierron. "Numerical issues in the virtual fields method". International Journal for Numerical Methods in Engineering 59, n. 10 (5 febbraio 2004): 1287–312. http://dx.doi.org/10.1002/nme.914.

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Feng, Chuxuan, e Jiawei Shao. "Application of Virtual Reality in Different Fields". Highlights in Science, Engineering and Technology 44 (13 aprile 2023): 213–19. http://dx.doi.org/10.54097/hset.v44i.7325.

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Virtual reality technology is a rapid development of technology in recent years, has a vital role in the development of different fields. Using image display, human-computer interaction and other technologies to generate three-dimensional environment. Enable participants to interact and manipulate virtual environments and objects in real time. This paper analyses and summarizes the development of VR from three areas. Firstly, it analyses the immersive experience brought by VR in games and discusses the influence of VR on games. Then it summarizes the application of VR in medical care and other fields, bringing more effective means to the treatment of diseases. Doctors can use VR headsets to practice more surgeries and train the younger generation. Finally, the differences between VR films and traditional films are analysed from the perspective of films. At the end of this paper, the development of VR in the above three fields are summarized and prospected.

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Knight, Travis W., G. Ronald Dalton e James S. Tulenko. "Virtual Radiation Fields—A Virtual Environment Tool for Radiological Analysis and Simulation". Nuclear Technology 117, n. 2 (febbraio 1997): 255–66. http://dx.doi.org/10.13182/nt97-a35330.

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Grédiac, Michel, e Fabrice Pierron. "Identifying Constitutive Parameters from Heterogeneous Strain Fields using the Virtual Fields Method". Procedia IUTAM 4 (2012): 48–53. http://dx.doi.org/10.1016/j.piutam.2012.05.006.

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GREDIAC, M. "Principe de la methode des champs virtuels avec champs speciauxPrinciple of the virtual fields method with special virtual fields". M�canique & Industries 4, n. 6 (novembre 2003): 679–86. http://dx.doi.org/10.1016/j.mecind.2003.09.010.

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Grédiac, Michel, Evelyne Toussaint e Fabrice Pierron. "Special virtual fields for the direct determination of material parameters with the virtual fields method. 1––Principle and definition". International Journal of Solids and Structures 39, n. 10 (maggio 2002): 2691–705. http://dx.doi.org/10.1016/s0020-7683(02)00127-0.

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Eakins, J., M. Abdelrahman, L. Hager, J. T. M. Jansen, E. Kouroukla, P. Lombardo, R. Tanner, F. Vanhavere e O. Van Hoey. "Virtual estimation of effective dose in neutron fields". Journal of Radiological Protection 41, n. 2 (1 giugno 2021): 360–83. http://dx.doi.org/10.1088/1361-6498/abf3b0.

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Wu, Hsin Yi, e Wen-Shu Lai. "Virtual Fields and Temporality in Andrei Tarkovsky’s Images". International Journal of the Image 9, n. 1 (2018): 57–65. http://dx.doi.org/10.18848/2154-8560/cgp/v09i01/57-65.

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Moussa, Majda, e Giovanni Beltrame. "Real-Time Path Planning With Virtual Magnetic Fields". IEEE Robotics and Automation Letters 6, n. 2 (aprile 2021): 3279–86. http://dx.doi.org/10.1109/lra.2021.3063992.

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Chen, Qile, Felix Janda e Rachel Webb. "Virtual cycles of stable (quasi-)maps with fields". Advances in Mathematics 385 (luglio 2021): 107781. http://dx.doi.org/10.1016/j.aim.2021.107781.

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MURATA, Kaori, e Akira KAGEYAMA. "Virtual Reality Visualization of Frozen-in Vector Fields". Plasma and Fusion Research 6 (2011): 2406023. http://dx.doi.org/10.1585/pfr.6.2406023.

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Vergara, Diego, Jamil Extremera, Manuel Pablo Rubio e Lilian P. Dávila. "The proliferation of virtual laboratories in educational fields". ADCAIJ: Advances in Distributed Computing and Artificial Intelligence Journal 9, n. 1 (22 marzo 2020): 85–97. http://dx.doi.org/10.14201/adcaij2020918597.

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Since its emergence in the 1960s, the use of virtual reality (VR) has grown progressively. This wide dissemination of VR has allowed its application in an increasing number of disciplines, including education. It is well known that virtual laboratories (VLs), which base their use in VR technology, are very useful tools in both university and professional training. In this article, the main advantages and disadvantages of the use of modern VLs in teaching are analyzed. In addition, the design and development process that must be followed to appropriately create these VLs is described in detail, as well as a small-scale study of the perception that university teachers have about the use of VR in education. Lastly, the reasons why the implementation of VR is not currently as broad as it would be expected, given its proven potential in different fields, are discussed.

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Mandar, Meriem, e Azedine Boulmakoul. "Fuzzy Pheromone Potential Fields for Virtual Pedestrian Simulation". Advances in Fuzzy Systems 2016 (2016): 1–11. http://dx.doi.org/10.1155/2016/4027687.

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The study of collective movement of pedestrians is crucial in various situations, such as evacuation of buildings, stadiums, or external events like concerts or public events. In such situations and under panic conditions, several incidents and disasters may arise, resulting in loss of human lives. Hence, the study and modeling of the pedestrians behavior are imperative in both normal and panic situations. In a previous work, we developed a microscopic model for pedestrian movement based on the algorithm of Ant Colonies and the principles of cellular automata. We took advantage of a fuzzy model to better reflect the uncertainty and vagueness of the perception of space to pedestrians, especially to represent the desirability or blurred visibility of virtual pedestrians. This paper uses the mechanism of artificial potential fields. Said fields provide virtual pedestrians with better visibility of their surroundings and its various components (goals and obstacles). The predictions provided by the first-order traffic flow theory are confirmed by the results of the simulation. The advantage of this model lies in the combination of benefits provided by the model of ants and artificial potential fields in a fuzzy modeling, to better understand the perceptions of pedestrians.

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Blümich, Bernhard. "Virtual special issue: Magnetic resonance at low fields". Journal of Magnetic Resonance 274 (gennaio 2017): 145–47. http://dx.doi.org/10.1016/j.jmr.2016.10.005.

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Bean, Alice, John P. Ralston e James Snow. "Evidence for observation of virtual radio Cherenkov fields". Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 596, n. 2 (novembre 2008): 172–85. http://dx.doi.org/10.1016/j.nima.2008.07.150.

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Dean, Kevin L., Xylar S. Asay-Davis, Evan M. Finn, Tim Foley, Jeremy A. Friesner, Yo Imai, Bret J. Naylor, Sarah R. Wustner, Scott S. Fisher e Kent R. Wilson. "Virtual Explorer: Interactive Virtual Environment for Education". Presence: Teleoperators and Virtual Environments 9, n. 6 (dicembre 2000): 505–23. http://dx.doi.org/10.1162/105474600300040367.

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The Virtual Explorer project of the Senses Bureau at the University of California, San Diego, focuses on creating immersive, highly interactive environments for education and scientific visualization which are designed to be educational—and exciting, playful, and enjoyable, as well. We have created an integrated model system on human immunology to demonstrate the application of virtual reality to education, and we've also developed a modular software framework to facilitate the further extension of the Virtual Explorer model to other fields. The system has been installed internationally in numerous science museums, and more than 7,000 individuals have participated in demonstrations. The complete source code—which runs on a variety of Silicon Graphics computers—is available on CD-ROM from the authors.

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Mishra, Rakesh, M. D. Krishna Narayanan, Giuseppe E. Umana, Nicola Montemurro, Bipin Chaurasia e Harsh Deora. "Virtual Reality in Neurosurgery: Beyond Neurosurgical Planning". International Journal of Environmental Research and Public Health 19, n. 3 (2 febbraio 2022): 1719. http://dx.doi.org/10.3390/ijerph19031719.

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Background: While several publications have focused on the intuitive role of augmented reality (AR) and virtual reality (VR) in neurosurgical planning, the aim of this review was to explore other avenues, where these technologies have significant utility and applicability. Methods: This review was conducted by searching PubMed, PubMed Central, Google Scholar, the Scopus database, the Web of Science Core Collection database, and the SciELO citation index, from 1989–2021. An example of a search strategy used in PubMed Central is: “Virtual reality” [All Fields] AND (“neurosurgical procedures” [MeSH Terms] OR (“neurosurgical” [All Fields] AND “procedures” [All Fields]) OR “neurosurgical procedures” [All Fields] OR “neurosurgery” [All Fields] OR “neurosurgery” [MeSH Terms]). Using this search strategy, we identified 487 (PubMed), 1097 (PubMed Central), and 275 citations (Web of Science Core Collection database). Results: Articles were found and reviewed showing numerous applications of VR/AR in neurosurgery. These applications included their utility as a supplement and augment for neuronavigation in the fields of diagnosis for complex vascular interventions, spine deformity correction, resident training, procedural practice, pain management, and rehabilitation of neurosurgical patients. These technologies have also shown promise in other area of neurosurgery, such as consent taking, training of ancillary personnel, and improving patient comfort during procedures, as well as a tool for training neurosurgeons in other advancements in the field, such as robotic neurosurgery. Conclusions: We present the first review of the immense possibilities of VR in neurosurgery, beyond merely planning for surgical procedures. The importance of VR and AR, especially in “social distancing” in neurosurgery training, for economically disadvantaged sections, for prevention of medicolegal claims and in pain management and rehabilitation, is promising and warrants further research.

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Grédiac, Michel, Evelyne Toussaint e Fabrice Pierron. "Special virtual fields for the direct determination of material parameters with the virtual fields method. 2––Application to in-plane properties". International Journal of Solids and Structures 39, n. 10 (maggio 2002): 2707–30. http://dx.doi.org/10.1016/s0020-7683(02)00128-2.

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Zhao, Yi. "Research and analysis of virtual reality in different fields". Applied and Computational Engineering 6, n. 1 (14 giugno 2023): 222–29. http://dx.doi.org/10.54254/2755-2721/6/20230772.

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Virtual reality technology is an emerging technology has been used in many fields. Because of its unique multi-perception, interactivity and autonomy, can enable users to obtain an immersive experience, enrich the sense of experience, VR is promoting the development and creation of multiple industrial fields with high speed. This article partly summarizes the application of VR technology in medical, educational and cultural fields. This paper analyzes the application characteristics and status quo of VR in the medical field, and discusses the progress and advantages of VR in education. It also summarizes the related technology of VR in culture. With the successful research and development of 5G technology, VR technology will also be improved, so VR technology will also be more widely used in various fields and promote the development of various fields.

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Fazzini, Marina, Olivier Dalverny e Sébastien Mistou. "Identification of Materials Properties Using Displacement Field Measurement". Key Engineering Materials 482 (giugno 2011): 57–65. http://dx.doi.org/10.4028/www.scientific.net/kem.482.57.

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The aim of this work is to identify parameters driving constitutive equations of materials with displacement field measurements carried out by image stereo-correlation during an unidirectional tensile test. We evaluate two identification techniques. The first one is the virtual fields method which consists in writing the principle of virtual work with particular virtual fields. It is generally used in the case of linear elasticity and it requires a perfect knowledge of the model in terms of boundary condition since the virtual fields used must be kinematically admissible. This method allows to determine parameters by a direct and fast calculation, without iterations. The second method is the finite element model updating method. It consists in finding constitutive parameters that achieve the best match between finite element analysis quantities and their experimental counterparts. This method is more adaptable than the virtual field method but it needs to spend more calculation time.

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Becker, W. "Quantum electrodynamics in intense laser fields". Laser and Particle Beams 9, n. 2 (giugno 1991): 603–18. http://dx.doi.org/10.1017/s026303460000361x.

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A very intense laser field polarizes the virtual electron-positron pairs that populate the vacuum. This provides for a coupling between different modes of the electromagnetic field, giving rise to effects such as scattering of light by light, a refractive index of the vacuum, vacuum birefringence, etc. Given enough energy in a sufficiently small spacetime region, the virtual pairs can become real, which leads to pair production in the intense field under the action of a third agent. These, as well as related effects, are summarized with respect to their orders of magnitude and conditions under which they might become accessible to experiment. Some other processes that are normally mentioned in this context, such as Thomson (Compton) scattering at high intensities, are considered, too, even though they are unrelated to the vacuum structure of quantum electrodynamics.

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Scipión, Danny E., Phillip B. Chilson, Evgeni Fedorovich e Robert D. Palmer. "Evaluation of an LES-Based Wind Profiler Simulator for Observations of a Daytime Atmospheric Convective Boundary Layer". Journal of Atmospheric and Oceanic Technology 25, n. 8 (1 agosto 2008): 1423–36. http://dx.doi.org/10.1175/2007jtecha970.1.

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Abstract The daytime atmospheric convective boundary layer (CBL) is characterized by strong turbulence that is primarily caused by buoyancy forced from the heated underlying surface. The present study considers a combination of a virtual radar and large eddy simulation (LES) techniques to characterize the CBL. Data representative of a daytime CBL with wind shear were generated by LES and used in the virtual boundary layer radar (BLR) with both vertical and multiple off-vertical beams and frequencies. To evaluate the virtual radar, a multiple radar experiment (MRE) was conducted using five virtual radars with common resolution volumes at two different altitudes. Three-dimensional wind fields were retrieved from the virtual radar data and compared with the LES output. It is shown that data produced from the virtual BLR are representative of what one expects to retrieve using a real BLR and the measured wind fields match those of the LES. Additionally, results from a frequency domain interferometry (FDI) comparison are presented, with the ultimate goal of enhancing the resolution of conventional radar measurements. The virtual BLR produces measurements consistent with the LES data fields and provides a suitable platform for validating radar signal processing algorithms.

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Mérienne, Frédéric. "Virtual and Augmented Reality for Building". Buildings 13, n. 6 (7 giugno 2023): 1475. http://dx.doi.org/10.3390/buildings13061475.

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Nimtz, Günter. "Macroscopic Virtual Particles Exist". Zeitschrift für Naturforschung A 74, n. 5 (27 maggio 2019): 363–66. http://dx.doi.org/10.1515/zna-2019-0020.

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AbstractVirtual particles are expected to occur in microscopic processes, as they are introduced, for instance, by Feynman in quantum electrodynamics as photons performing in an unknown way in the interaction between two electrons. This note describes macroscopic virtual particles as they appear in classical evanescent modes and in quantum mechanical tunnelling particles. Remarkably, these large virtual particles are present in wave mechanics of elastic, electromagnetic, and Schrödinger fields.

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Norris, John W. "Creating virtual surround using dipole and monopole pressure fields". Journal of the Acoustical Society of America 105, n. 2 (febbraio 1999): 933. http://dx.doi.org/10.1121/1.426305.

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Iwaya, Yukio, Makoto Otani e Takao Tsuchiya. "Discrimination of virtual sound fields different in spatial aliasing". Journal of the Acoustical Society of America 140, n. 4 (ottobre 2016): 2999. http://dx.doi.org/10.1121/1.4969293.

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Subramanian, S. J., e N. Nigamaa. "On a boundary condition used in Virtual Fields methods". Mechanics Research Communications 63 (gennaio 2015): 41–47. http://dx.doi.org/10.1016/j.mechrescom.2014.11.008.

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Poon, P. W., e J. F. Brugge. "Virtual-space receptive fields of single auditory nerve fibers". Journal of Neurophysiology 70, n. 2 (1 agosto 1993): 667–76. http://dx.doi.org/10.1152/jn.1993.70.2.667.

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1. Sounds reaching the tympanic membranes are first modified by the acoustic properties of the torso, head, and external ear. For certain frequencies in the incident sound there results a complex, direction-dependent spatial distribution of sound pressure at the eardrum such that, within a sound field, localized areas of pressure maxima are flanked by areas of pressure minima. Listeners may use these spatial maxima and minima in localizing the source of a sound in space. The results presented describe how information about this spatial pressure pattern is transmitted from the cochlea to the central auditory system via single fibers of the auditory nerve. 2. Discharges of single fibers of the auditory nerve were studied in Nembutal-anesthetized cats [characteristic frequencies (CFs) ranged from 0.4 to 40 kHz]. Click stimuli were derived from sound-pressure waveforms that were generated by a loudspeaker placed at 1,800 locations around the cat's head and recorded at the tympanic membrane with miniature microphones. Recorded signals were converted to acoustic stimuli and delivered to the ear via a calibrated and sealed earphone. The full complement of signals is referred to as "virtual acoustic space," and the spatial distribution of discharges to this array of signals is referred to as a "virtual-space receptive field" (VSRF). 3. Fibers detect both pressure maxima and pressure minima in virtual acoustic space. Thus VSRFs take on complex shapes. 4. VSRFs of fibers of the same or similar CF having low spontaneous rates had the same overall pattern as those from high-spontaneous rate (HSR) fibers. For HSR fibers, the VSRF is obscured by the high background spike activity. 5. Comparison of the VSRF and isolevel contour maps of the stimulus derived at various frequencies revealed that auditory nerve fibers most accurately extract spectral information contained in the stimulus at a frequency close to or slightly higher than CF.

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Considine, J. M., F. Pierron, K. T. Turner e D. W. Vahey. "General Anisotropy Identification of Paperboard with Virtual Fields Method". Experimental Mechanics 54, n. 8 (1 agosto 2014): 1395–410. http://dx.doi.org/10.1007/s11340-014-9903-1.

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Avril, S., M. Gr�diac e F. Pierron. "Sensitivity of the virtual fields method to noisy data". Computational Mechanics 34, n. 6 (1 giugno 2004): 439–52. http://dx.doi.org/10.1007/s00466-004-0589-6.

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Lima, Luiz A. P., e Alcides Calsavara. "Autonomic Application-Level Message Delivery Using Virtual Magnetic Fields". Journal of Network and Systems Management 18, n. 1 (31 ottobre 2009): 97–116. http://dx.doi.org/10.1007/s10922-009-9145-1.

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Nelson, P. A., O. Kirkeby, T. Takeuchi e H. Hamada. "SOUND FIELDS FOR THE PRODUCTION OF VIRTUAL ACOUSTIC IMAGES". Journal of Sound and Vibration 204, n. 2 (luglio 1997): 386–96. http://dx.doi.org/10.1006/jsvi.1997.0967.

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Liu, Zhishan. "Application of virtual reality technology in the psychological field". Applied and Computational Engineering 6, n. 1 (14 giugno 2023): 533–39. http://dx.doi.org/10.54254/2755-2721/6/20230853.

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Virtual Reality is now widely used in various fields, which includes entertainment, education, working and telecommuting. With the popularization of virtual reality technology, there are more and more fields that VR is able to apply to, such as medical care and corresponding therapies. In this article, a new idea of using virtual reality in psychological field will be provided and scrutinized. By literature review and quantitative analysis, virtual reality technology can actually contribute to psychological consulting by transform the counselling environment, combining with other technologies, together stated in this passage with other potential usage and ethical issues.

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Anfinogentov, Vasilij, e Aleksandr Hramov. "Influence of distributed feedback on chaotic virtual cathode oscillation". Izvestiya VUZ. Applied Nonlinear Dynamics 6, n. 1 (1998): 93–107. http://dx.doi.org/10.18500/0869-6632-1998-6-1-93-107.

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Complex dynamics of clectron beam with virtual cathode and distributed feedback is considered with the aid of numerical simulation. Characteristics of virtual cathode complex dynamics is investigated. For the system with connection through electron beam formation of the different types of autostructures is considered. It is proved, that complications of virtual cathode oscillation are connected with an increase of interaction between structures. For е system with connection through clectromagnetic fields (vircator — BWO) structures formation processes are investigated. It is demonstrated, that second structurc suppression by the interaction of virtual cathode with backwave fields makes possiblc controlling of output radiation characteristics.

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Krithika, M., P. Rajeswari e P. Thilakaveni. "College Virtual Tour using Virtual Reality". International Journal for Research in Applied Science and Engineering Technology 12, n. 2 (29 febbraio 2024): 631–43. http://dx.doi.org/10.22214/ijraset.2024.58403.

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Abstract: Virtual reality has become one of the highly interesting and popular fields. Also in recent times, the concept of the metaverse and its idea of a virtual world is being spread rapidly. As the technological connotation of the term VR has been changing and encompasses various VR systems with different capabilities, it has also paved a way for virtual tourism. The current pandemic situation made people around the world stay inside their houses, which has led to the growth of virtual tourism. Yet the usage of VR is not as wide as its reach. The main reason for VR’s less usage is its affordability, not everyone could afford a VR headset. The objective of this project is to create an immersive virtual tour of the college that can be used by even an individual without any proper gear. Virtual tours are a way for people to experience and explore a place that exists in reality as a physical space via the internet. The old techniques of the virtual tour are either of a pre-recorded video form or just some collections of 360-degree images. To improve the experience, we are creating a 3D virtual environment that the user can access without any restrictions. The user can download the file and can run the program on their desired platform

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Erdős, Sándor. "A virtuális valóság technológiai és egészségügyi fejlődése 2000-ig." Kaleidoscope history 11, n. 23 (2021): 340–49. http://dx.doi.org/10.17107/kh.2021.23.340-349.

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Virtual reality is a 360-degree artificial environment, which creates the sense of real presence in spatial terms. Several medical fields utilize its mentioned property. The aim of this study is to show the history of virtual reality from 1960 to 2000 and its first ten years in healthcare. Struggling technological development was led by talented computer scientists as Ivan Sutherland and Thomas Furness. Education and psychiatry were the first two fields of virtual reality in medicine. Scientists discovered the negative aspects of virtual reality already at the beginning as a cybersickness syndrome. Both technological and medical development was slow however it contributed gradually to our contemporary and highly developed technology.

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Xavier, José, e Fabrice Pierron. "Measuring orthotropic bending stiffness components of Pinus pinaster by the virtual fields method". Journal of Strain Analysis for Engineering Design 53, n. 8 (30 luglio 2018): 556–65. http://dx.doi.org/10.1177/0309324718791087.

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Orthotropic stiffness components of Pinus pinaster Ait. wood are simultaneously determined by means of a heterogeneous plate bending test. The proposed inverse identification approach couples full-field slope measurements provided by deflectometry with the virtual fields methods. Wooden plates oriented in the longitudinal–radial and longitudinal–tangential material planes were manufactured. A procedure was implemented to allow suitable specular reflective coating of the wooden plates, required in the deflectometry technique. Reconstructed curvature fields, applied load and plate dimensions were input in virtual fields methods for material parameter identification, assuming Kirchhoff–Love classical plate theory. Several virtual fields and load cases were analysed to address the identifiability of the method. The values of the orthotropic elastic constants obtained from the proposed approach were found in good agreement with regard to reference ones for the same species and determined from classical tensile, compression and shear mechanical tests.

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Mei, Yue, Jiahao Liu, Xu Guo, Brandon Zimmerman, Thao D. Nguyen e Stéphane Avril. "General Finite-Element Framework of the Virtual Fields Method in Nonlinear Elasticity". Journal of Elasticity 145, n. 1-2 (16 giugno 2021): 265–94. http://dx.doi.org/10.1007/s10659-021-09842-8.

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AbstractThis paper presents a method to derive the virtual fields for identifying constitutive model parameters using the Virtual Fields Method (VFM). The VFM is an approach to identify unknown constitutive parameters using deformation fields measured across a given volume of interest. The general principle for solving identification problems with the VFM is first to derive parametric stress field, where the stress components at any point depend on the unknown constitutive parameters, across the volume of interest from the measured deformation fields. Applying the principle of virtual work to the parametric stress fields, one can write scalar equations of the unknown parameters and solve the obtained system of equations to deduce the values of unknown parameters. However, no rules have been proposed to select the virtual fields in identification problems related to nonlinear elasticity and there are multiple strategies possible that can yield different results. In this work, we propose a systematic, robust and automatic approach to reconstruct the systems of scalar equations with the VFM. This approach is well suited to finite-element implementation and can be applied to any problem provided that full-field deformation data are available across a volume of interest. We also successfully demonstrate the feasibility of the novel approach by multiple numerical examples. Potential applications of the proposed approach are numerous in biomedical engineering where imaging techniques are commonly used to observe soft tissues and where alterations of material properties are markers of diseased states.

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Yan, Bingbing, Fu Jun Ren e Y. C. Jiang. "Research on Integrated System of Information and Function Based on Virtual Prototyping Technology". Key Engineering Materials 392-394 (ottobre 2008): 884–90. http://dx.doi.org/10.4028/www.scientific.net/kem.392-394.884.

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Virtual prototyping technology as a key technology for agile manufacturing can deal with multidisciplinary knowledge across different fields. In the complex product development process, the exchange between heterogeneous data in heterogeneous environment is a universal problem encountered, which increases the complexity of collaborative parallel design of virtual prototype. Taking the product models as carriers and the different function requirements as clues, the knowledge structure and expression of product information in various fields was studied. By adopting component object model technology, direct geometry access technology, behavioural modeling technology and parametric design thinking, the interaction among tools in various function units was realized, and the effective integration of information and function in multi-fields was accomplished, the parameter-driven virtual prototype architecture of complex product based on the integration of information and function was created. The feasibility of this architecture has been verified by the actual engineering. This plan provides an effective way to carry out virtual prototype projects for enterprise.

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Kim, Chanyang, e Myoung-Gyu Lee. "Finite element-based virtual fields method with pseudo-real deformation fields for identifying constitutive parameters". International Journal of Solids and Structures 233 (dicembre 2021): 111204. http://dx.doi.org/10.1016/j.ijsolstr.2021.111204.

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Zhu, Sheng, Ju Kun Yao e Pei Zhi Cui. "Study and Application of Virtual Remanufacturing". Advanced Materials Research 346 (settembre 2011): 216–21. http://dx.doi.org/10.4028/www.scientific.net/amr.346.216.

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Virtual Remanufacturing is an important technology of remanufacturing engineering, which has a distinct benefit to improve remanufacturing development. On the base of definition and characteristics analysis of virtual remanufacturing, this paper puts forward the virtual remanufacturing framework, key technologies and development environment, and describes the main application fields of virtual remanufacturing, which will provide a reference for virtual remanufacturing exploitation and development.

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Xu, Shaoheng, Thushara Abhayapala e Jihui (Aimee) Zhang. "Sound field navigation with virtual higher-order sound sources using complex greedy pursuit algorithm". Journal of the Acoustical Society of America 154, n. 4_supplement (1 ottobre 2023): A181. http://dx.doi.org/10.1121/10.0023195.

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As the Virtual Reality (VR) and metaverse industries continue to expand rapidly, there is a growing need to capture and recreate real-world experiences in immersive audio-visual scenes. Sound field translation, which activates equivalent virtual sources to recreate spatial sound fields, enables users to navigate through these scenes seamlessly. However, combining recordings from different microphones and processing mixed fields of exterior and interior sources present significant challenges. This paper introduces a novel method for virtual navigation by sparsely decomposing complex sound fields using distributed virtual higher-order sound sources and an iterative complex greedy pursuit algorithm. By combining spatially separated microphone recordings, the technique identifies its sparse representation with several higher-order virtual sources. This process effectively decomposes the complex sound field into a grid of higher-order sources, leveraging the power of the complex greedy pursuit algorithm. Through extensive experimentation, we demonstrate the suitability of our method for applications such as VR navigation and sound field reproduction with binaural devices. The results showcase enhanced realism and accuracy, offering users a truly immersive audio experience in virtual environments. As the demand for realistic audio-visual scenes grows, this innovative approach holds promise for advancing VR technology and enriching user experiences in the metaverse.

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MADINIER, Nicolas, Quentin LECLèRE, Kerem EGE e Alain BERRY. "Experimental identification of the bending stiffness and damping of plates using the frequency-adapted virtual fields Method". INTER-NOISE and NOISE-CON Congress and Conference Proceedings 270, n. 9 (4 ottobre 2024): 2137–48. http://dx.doi.org/10.3397/in_2024_3142.

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Inverse vibroacoustic methods can be used to identify the complex bending stiffness of a plate from its vibratory response. This work focuses on the Virtual Fields Method (VFM) and the Force Analysis Technique (FAT). The VFM uses functions called virtual fields to solve the Principle of Virtual Work, a weak form of equilibrium, and identifies complex bending stiffness. Here, the virtual fields are defined as piecewise functions over a surface smaller than the plate (virtual window). FAT uses a finite-difference scheme to discretize the fourth-order spatial derivatives of the displacement in the local equilibrium of the plate and thus estimates the bending stiffness. The application of a finite-difference scheme creates a bias in the identified stiffness, which increases with frequency. The Corrected Force Analysis Technique (CFAT) corrects this bias in the high-frequency domain. In this study, it is proposed to apply the CFAT principles to the VFM to adapt the method, using the virtual window size, so it can be applied it in the high-frequency domain. FAT, CFAT, the VFM and the Frequency-Adapted VFM will be presented. The method was tested on experimental data to identify the complex bending stiffness of an aluminium plate partially covered with a damping material.

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Bis, Łukasz. "Virtual Reality. Now." Social Communication 4, s1 (1 dicembre 2018): 121–27. http://dx.doi.org/10.2478/sc-2018-0030.

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Abstract The purpose of this article is to introduce and rank information related to virtual reality as a new media phenomenon. In principle, in the Polish nomenclature, the term is so new that it is often confused, incomprehensible. This, in turn, translates into misunderstanding and the lack of the use of this communication channel. The article is a review of literature. In the first part concepts such as augmented reality, augmented virtuality, mixed reality, virtual reality, and immersion will be explained. A short historical outline of the virtual reality will also be shown. Then - in the next part of the article - the author compares this communication channel with well-known, such as the Internet, television, radio. Next the author will determine what are the fields of application of this communication channel and its condition.

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Chakravartty, Paula, e Mara Mills. "Virtual Roundtable on “Decolonial Computing”". Catalyst: Feminism, Theory, Technoscience 4, n. 2 (16 ottobre 2018): 1–4. http://dx.doi.org/10.28968/cftt.v4i2.29588.

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Calls to wrest the history and anthropology of computing, information technology, and digital media away from eurocentric analyses have been raised in the fields of STS and media studies over the last decade. This roundtable revisits discussions that take us beyond the dominant developmentalist approaches to technology in the global South, weighing the gains that have been made to incorporate decolonial theory and practice.

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