Re: X Force Keygen Simulation Mechanical 2018 Portable
Gaspard Xenos
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The conversion of mechanical stress into a biochemical signal in a muscle cell requires a force sensor. Titin kinase, the catalytic domain of the elastic muscle protein titin, has been suggested as a candidate. Its activation requires major conformational changes resulting in the exposure of its active site. Here, force-probe molecular dynamics simulations were used to obtain insight into the tension-induced activation mechanism. We find evidence for a sequential mechanically induced opening of the catalytic site without complete domain unfolding. Our results suggest the rupture of two terminal beta-sheets as the primary unfolding steps. The low force resistance of the C-terminal relative to the N-terminal beta-sheet is attributed to their different geometry. A subsequent rearrangement of the autoinhibitory tail is seen to lead to the exposure of the active site, as is required for titin kinase activity. These results support the hypothesis of titin kinase as a force sensor.
Hello,
This is very likely a dumb question, but I've really searched the whole day and could not find an answer.
It is possible, and if so, how should I go about to do it, to make a mechanical model where the movement is a result of the displacement of the support?
Every example and component I could find both in the Multibody library and Planar Mechanics are driven by a force, or the inertia of some component. What I need is something similar to the "Position" component of the Translation Library, or someway of connecting it to the Multibody library or planar mechanics library.
Hallo,
Your question is unclear. That is the reason of no reply from others. Your Intension of using this posiiton model is not clear from description. You need to describe more about your model if you still want help.
Regards
Joel Jossy
Hello, thanks for taking the time to reply. I apologize for not being clear in the first place. I also apologize in advance for the "ms paint" skills that are about to come.
I made a drawing that perhaps would make the situation clear. The simplest model for the study of vehicular suspensions is a single degree of freedom model which is excited by the movement of the base. I made a simple schematic with OMEdit shown below. Please disregard the fact that as it is, the body can move just about everywhere, in a real model there would be constraints that would allow it to move only vertically.
The problem is to compute the displacement of the body given a known displacement (not force, the resultant contact force is one of the things I'd like to compute) of the ground. This has to be something very obvious, so I apologize again
Thanks for the attention,
Hi,
Still there are contradictions. You are telling that ".....model which is excited by the movement of the base" and still wand to fix it in space? Because if you use Modelica library model 'fixed' at the base then that flange will have:
d(fixed.flange_a.s)/dt=0. I think you are aware of that. Then still why you want to use this model at base?
It should be not complex unless if you want to use visualization. Also i have no expertise in animation. If you want a simple model and want to find the curve of y(t)/dt. Then just input a force exertion model (where force flows out intermittently at varying amplitudes) to the flange of spring-damper model. You can attach fixed model to base of Force model.This only works if you want to simulate how mass behaves vertically if the base of the Tyre is given with shocks (like gutter in road).
Best wishes,
Joel Jossy
Hello Joel, thanks for the information, I'll surely do as you suggest, but as this was a short term project for a student of mine, I built a model on another system that I was more familiar with.
I have no problems with programming part of the solution myself, I just wanted to make sure I was not missing something obvious and reinventing the wheel, since this model, with excitation coming from the movement of the base, is really very common in mechanical engineering for suspension simulation and vibration isolation, also for mechanisms normally we would input the velocity of a link and compute the velocity of other links, in civil engineering it's used to compute the response to earthquakes and so on.
Please understand that I'm not complaining, I fully understand that no one has any obligation to do for free the things that are useful to me, I'm just commenting on a design choice that was very different from what I would have made.
Thanks again for the time you spent on this,
Ramiro.
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While most existing theoretical studies on the borophene are based on first-principles calculations, the present work presents molecular dynamics simulations for the lattice dynamical and mechanical properties in borophene. The obtained mechanical quantities are in good agreement with previous first-principles calculations. The key ingredients for these molecular dynamics simulations are the two efficient empirical potentials developed in the present work for the interaction of borophene with low-energy triangular structure. The first one is the valence force field model, which is developed with the assistance of the phonon dispersion of borophene. The valence force field model is a linear potential, so it is rather efficient for the calculation of linear quantities in borophene. The second one is the Stillinger-Weber potential, whose parameters are derived based on the valence force field model. The Stillinger-Weber potential is applicable in molecular dynamics simulations of nonlinear physical or mechanical quantities in borophene.
Boron can be formed into a number of finite clusters due to plenty of chemical bonding for this element1. Some of these planar boron clusters were proposed as potential basis for the formation of single-layer boron (i.e. borophene)2,3,4. The structure of borophene on different substrates was predicted theoretically5,6, and was produced in recent experiments7,8,9,10.
Besides the pure borophene, few approaches have been proposed to modify the electronic or phonon properties in borophene. For instance, hydrogenation can effectively tune the electronic current or other mechanical properties for the borophene31,32,33. Free edges in the borophene nanoribbon were found to be important for mechanical, electronic, magnetic, and thermal transport properties34,35,36. The strain effect has been studied for mechanical properties28,37,38, or magnetic properties in borophene39. Several defects were predicted to cause considerable effects on the anisotropic mechanical properties of the borophene30.
Along with the study of fundamental physical properties for borophene, there have also been some investigations on possible applications of borophene in the applied research fields. For example, the application of borophene as high capacity electrodes or anode materials was examined by several recent works40,41. First-principles calculations predicted possible superconductivity phenomenon in borophene due to the phonon-electron interaction42,43,44, which can be further manipulated by strain and carrier-doping45.
From the above literature survey, we find that most existing theoretical works are based on the first-principles calculations. These calculations are accurate, but are limited to small (or bulk) structures due to high computation requirements. As an alternative approach, the molecular dynamics simulation can be utilized to investigate very large systems typically containing more than 104 atoms. The key ingredient in the molecular dynamics simulation is the interatomic interaction. The only one interaction potential available for the borophene is the ReaxFF force field model46. The present work aims to develop efficient linear and nonlinear empirical potentials for the borophene, which can assist further theoretical investigations for borophene of large size.
In this paper, we provide the valence force field (VFF) model and the Stillinger-Weber (SW) potential for the description of the interaction in borophene with low-energy triangular structure. The VFF model is a linear potential, which can be used to calculate elastic quantities such as the phonon dispersion. The SW potential is a nonlinear potential, which is derived based on the VFF model. The SW potential can be applied in the molecular dynamics simulation of nonlinear physical or mechanical properties for borophene. We demonstrate the usage of the SW potential with the publicly available LAMMPS package.
(a) Top view. Atoms are categorized into top chains and bottom chains. The top chain includes atoms like 1, 4, and 7. The bottom chain includes atoms like 2, 3, 5, and 6. The unit cell is shown by blue rectangle. The first Brillouin zone is shown by red rectangle on the left. (b) Perspective view illustrates the puckered configuration, with h as the distance between the top and bottom chains along the out-of-plane z-direction. The pucker is perpendicular to the x-axis and is parallel with the y-axis.
The VFF model is a useful linear model for the description of interatomic interactions in covalent materials, in which interactions are decomposed into some characteristic bond stretching and angle bending components47. These interaction components are in close relation with the vibration morphology of phonon modes. It is thus a proper approach to determine the VFF model for a covalent material based on its phonon dispersion. There are two typical terms for the VFF model, i.e., the bond stretching Vr and the angle bending Vθ,
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