scholarly journals A Time-independent Deformer for Elastic-rigid Contacts

2020 ◽  
Vol 3 (1) ◽  
pp. 1-21
Author(s):  
Camille Brunel ◽  
Pierre Bénard ◽  
Gaël Guennebaud ◽  
Pascal Barla
Keyword(s):  
Contact Region ◽  
Time Resolved ◽  
Rigid Object ◽  
Volume Preservation ◽  
Non Linear ◽  
Two Stages ◽  
Deformation Approach ◽  
Elastic Object

We introduce a new tool that assists artists in deforming an elastic object when it comes in intersection with a rigid one. As opposed to methods that rely on time-resolved simulations, our approach is entirely based on time-independent geometric operators. It thus restarts from scratch at every frame from a pair of objects in intersection and works in two stages: the intersected regions are first matched and a contact region is identified on the rigid object; the elastic object is then deformed to match the contact while producing plausible bulge effects with controllable volume preservation. Our direct deformation approach brings several advantages to 3D animators: it provides instant feedback, permits non-linear editing, allows for the replicability of the deformation in different settings, and grants control over exaggerated or stylized bulging effects.

scholarly journals Time-resolved non-linear optical response and photo-induced carriers trapping in glassy semiconductors

2020 ◽  
Vol 1461 ◽  
pp. 012139
Author(s):  
E Romanova ◽  
A Afanasiev ◽  
A Velmuzhov ◽  
M Sukhanov ◽  
Yu Kuzyutkina ◽  
...  
Keyword(s):  
Optical Response ◽  
Time Resolved ◽  
Non Linear ◽  
Linear Optical

A time-resolved luminescence spectroscopy study of non-linear optical crystals K2Al2B2O7

2012 ◽  
Vol 132 (7) ◽  
pp. 1632-1638 ◽  
Author(s):  
I.N. Ogorodnikov ◽  
V.A. Pustovarov ◽  
S.A. Yakovlev ◽  
L.I. Isaenko ◽  
S.A. Zhurkov
Keyword(s):  
Luminescence Spectroscopy ◽  
Spectroscopy Study ◽  
Time Resolved ◽  
Optical Crystals ◽  
Non Linear ◽  
Linear Optical

A dispenser–reactor apparatus applied forin situXAS monitoring of Pt nanoparticle formation

2015 ◽  
Vol 22 (3) ◽  
pp. 736-744 ◽  
Author(s):  
Jocenir Boita ◽  
Marcus Vinicius Castegnaro ◽  
Maria do Carmo Martins Alves ◽  
Jonder Morais
Keyword(s):  
Photoelectron Spectroscopy ◽  
Metallic Nanoparticles ◽  
Pt Nanoparticles ◽  
Lattice Parameter ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray ◽  
Two Stages ◽  
X Ray Absorption

In situtime-resolved X-ray absorption spectroscopy (XAS) measurements collected at the PtL3-edge during the synthesis of Pt nanoparticles (NPs) in aqueous solution are reported. A specially designed dispenser–reactor apparatus allowed for monitoring changes in the XAS spectra from the earliest moments of Pt ions in solution until the formation of metallic nanoparticles with a mean diameter of 4.9 ± 1.1 nm. By monitoring the changes in the local chemical environment of the Pt atoms in real time, it was possible to observe that the NPs formation kinetics involved two stages: a reduction-nucleation burst followed by a slow growth and stabilization of NPs. Subsequently, the synthesized Pt NPs were supported on activated carbon and characterized by synchrotron-radiation-excited X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and extended X-ray absorption fine structure (EXAFS). The supported Pt NPs remained in the metallic chemical state and with a reduced size, presenting slight lattice parameter contraction in comparison with the bulk Pt values.

Time-resolved non-linear nanoscopy

2017 ◽  
Author(s):  
Matthias Lenzner ◽  
Wolfgang Rudolph ◽  
Luke Emmert
Keyword(s):  
Time Resolved ◽  
Non Linear

scholarly journals Time resolved imaging of the non-linear bullet mode within an injection-locked nano-contact spin Hall nano-oscillator

2018 ◽  
Vol 113 (19) ◽  
pp. 192405 ◽  
Author(s):  
T. M. Spicer ◽  
P. S. Keatley ◽  
M. Dvornik ◽  
T. H. J. Loughran ◽  
A. A. Awad ◽  
...  
Keyword(s):  
Time Resolved ◽  
Non Linear ◽  
Time Resolved Imaging

Comparison of Non-Linear and Linearized CFD Analysis of the Stator-Rotor Interaction of a Compressor Stage

2014 ◽  
Author(s):  
Harald Schoenenborn ◽  
Graham Ashcroft
Keyword(s):  
Rotor Blade ◽  
Vibration Mode ◽  
Guide Vane ◽  
Mode Shapes ◽  
Inlet Guide Vane ◽  
Compressor Stage ◽  
Acoustic Interaction ◽  
Bending Mode ◽  
Non Linear ◽  
Two Stages

The prediction of resonance amplitudes due to stator-rotor interactions is still an important task within the design process of turbomachinery bladings. In this paper the stator-rotor interaction of a compressor stage which consists of an inlet guide vane and a rotor blade is studied with a non-linear and a linearized CFD code. First, a quasi-3D-study of a section close to the tip region is considered. The passing of the wake of the inlet guide vane over the rotor is studied for six different vibration mode shapes of increasing complexity (first bending mode up to 4th chordwise bending mode). Whereas for low rotor speeds the comparison between linearized and non-linear calculations is quite good, large differences are found for high rotor speeds. It is shown that an acoustic interaction between the two stages with a cut-on mode is the cause for the large differences, leading to much higher unsteady pressure amplitudes on the rotor blade. This in turn leads to different aerodynamic work on the rotor blade for the different mode shapes. The extension of the investigations to 3D shows essentially the same effects.

scholarly journals Shape Optimization of Running Specific Prosthesis Based on Force-Displacement Characteristics

Proceedings ◽  
2020 ◽  
Vol 49 (1) ◽  
pp. 7
Author(s):  
Cem Guzelbulut ◽  
Katsuyuki Suzuki ◽  
Satoshi Shimono ◽  
Hiroaki Hobara
Keyword(s):  
Contact Region ◽  
Contact Phase ◽  
Mass System ◽  
Reinforced Plastics ◽  
Non Linear ◽  
Spring System ◽  
Two Phases ◽  
And Performance ◽  
Mass Spring ◽  
Force Displacement

Usage of carbon fiber reinforced plastics (CFRPs) in running-specific prostheses increases day by day. The tailorable properties of CFRP blades bring many discussions about design and performance. In this study, the effect of shape on performance is investigated through force-displacement characteristics of the prosthesis. For this purpose, the geometry of prosthesis is defined by using B-splines with an initially given thickness. The prosthesis is exposed to vertical tip load at the mounting point, and contact is defined between the prosthesis and ground without friction. The aim of the simulation is to observe the contact behavior of athletes at different positions during the contact phase of a prosthesis. While the prosthesis is in contact with the ground, two different behaviors are observed: compression occurs at a larger contact zone, whereas release occurs at a smaller contact region (almost only the tip of the prosthesis). Different force-displacement characteristics, such as linear and second order, are obtained and the geometry of the prosthesis is optimized to adjust the behavior in the first region. The releasing phase of a prosthesis is related to the contact angle (angle of attack) and stiffness of the prosthesis. The two phases of contact are combined into a non-linear spring-mass system. Ground reaction forces are estimated through the non-linear mass-spring system. Finally, the importance of contacting area, length of moment arm during contact, and effect of each type of force-displacement characteristics on performance is discussed.

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