We develop an analytical framework for self-stabilizing optical manipulation of freestanding metasurfaces in three dimensions. Our reveals that the challenging problem stabilization against translational and rotational perturbations dimensions is reduced to a simpler scattering analysis metasurface unit cell two derive universal stiffness coefficients applicable arbitrary three-dimensional radi...

In this work, the mechanical response of an one-dimensional active solid—defined as a network stochastic particles interacting by nonlinear hard springs— subject to external deformation force, is numerically studied and rationalized with minimal model. It found that solid made linear springs stress presents average which independent system’s activity. However, when springs, solid’s decreases re...

The significance of the seismic rotational components have been overlooked in the seismic evaluation of structural behavior. As researchers have measured seismic components more accurately using sensitive rotational velocity sensor, it was observed that the magnitude of rotational components is considerable and could not be neglected. Hence, some parts of seismic damage or failure of structures...

Based on the first-order shear deformation theory, a 3-node co-rotational triangular finite element formulation is developed for large modeling of non-smooth, folded and multi-shell laminated composite structures. The two smaller components mid-surface normal vector shell at node are defined as nodal rotational variables in local coordinate system. In global system, one vector, together with sm...

Abstract With the increasingly deepen knowledge on structural dynamic behaviour, nowadays, monumental staircases and their steps are usually designed with high stiffness low mass, obtaining fundamental frequencies, out of interval step frequencies excitable by human walking. However, neglecting structure’s mass can also result in levels impulsive responses. Furthermore, often connection between...

A six-node co-rotational curved triangular shell finite element with a novel rotation treatment for folded and multi-shell structures is presented. Different from other formulations, rotations are not represented by axial (pseudo) vectors, but components of polar (proper) which additivity commutativity lead to symmetry the tangent stiffness matrices in both local global coordinate systems. In s...

Although the principle of using x-rays for diagnostic imaging has been known for a long time, there is still a lot of research and improvements going on in the field. One recent addition to the neuro-vascular imaging system—used for visualizing blood vessels in the brain and guidance of interventions—is 3D rotational angiography (3D-RA). Using 3D-RA, it is possible to view the vessel tree in 3D...

Abstract In this work, an application of two noded beam finite element methodology, which is demonstrated in the previous research work for vibration analysis with a flexible joint problem, has been further extended here to investigate buckling behaviour free–free subjected in-plane compressive load. Joint modelled as rotational spring, where spring stiffness governs joint. Variation first five...