A parallelogram allows the output link to remain at a fixed orientation with respect to an input link, for which it acts as a unique role in the design of parallel mechanisms. In this paper, the unique role of a parallelogram is used completely to design some new parallel mechanisms with two to six degrees of freedom (DoFs). In these mechanisms, some with three DoFs possess the advantage of ver...

This paper presents a methodology to enhance an interactive simulation system using Augmented Reality (AR) in the field of teaching/learning dynamics. The 3D-simulation model is being developed as a first step in order to develop an interactive (AR) book for engineering students. The purpose is to illustrate the benefits of enhancing the computer-aided simulation (CAS) using augmented reality t...

BAR domains are proteins that sense and sculpt curved membranes in cells, furnishing a relatively well-studied example of mechanisms employed in cellular morphogenesis. We report a computational study of membrane bending by BAR domains at four levels of resolution, described by 1), all-atom molecular dynamics; 2), residue-based coarse-graining (resolving single amino acids and lipid molecules);...

We analyze, with the computer code LS-DYNA, three-dimensional (3D) transient deformations of a 10-layer woven Kevlar armor held in a square steel frame and impacted at normal incidence by a 9 mm FMJ (full metal jacket), 124 grain projectile. The composite armor is discretized into weft and warp yarns to simulate its woven structure. The yarn is modeled as a 3D continuum. We consider failure of ...

We consider the relationship between the lengths of the two diagonals in the four-bar planar linkage. For convex and crossing linkages one diagonal increases if, and only if, the other decreases. On the other hand, for non-convex simple linkages one diagonal increases if, and only if, the other increases. We present simple elementary proofs of this geometric property. The proofs are simpler tha...

this article contains kinematic and dynamic analysis of the tilting mechanism turnaround charging crane main trolley, conducted with use Mathcad package. The is modeled by a flat link – four-bar linkage. In same time, also using Matlab Simulink environment tools Multibody, which library. These two models were then compared. study work-energy theorem Holonomic constraints equations used.

Two degree-of-freedom (2-DOF) closed spatial linkages can be useful in the design of robotic devices for spatial rigid-body guidance or manipulation. One of the simplest linkages of this type, without any passive DOF on its links, is the revolutespherical-revolute-spherical (RSRS) four-bar spatial linkage. Although the RSRS topology has been used in some robotics applications, the kinematics st...

Memetic algorithms (MA), explored in recent literature, are hybrid metaheuristics formed by the synergistic combination of a population-based global search technique with one or more local search algorithms, which in turn can be exact or stochastic methods. Different versions of MAs have been developed, and although their use was focused originally on combinatorial optimization, nowadays there ...

1. Abstract This paper presents a simple approach to optimize the dimensions and the positions of 2D mechanisms for path or function-generator synthesis. The proposed method is particularly adapted to assembled mechanisms since time-varying dimensions always satisfy the assembly conditions which may represent a real difficulty when dealing with closed-loop mechanisms. The objective is to minimi...

The scalar resonances $X(3915), X(3960), X(4140)$ are considered as exotic four-quark states: $cq\bar c \bar q, cs\bar s, c\bar s$, while the $X(3863)$ is proved to be $c\bar c, 2\,^3P_0$ state. masses and widths of these calculated in framework Extended Recoupling Model, where a system formed inside bag has relatively small size ($\la 1.0$~fm). Then resonance $X(3915)$ appears due transitions:...