For a world where energy demand is increasing day by day, available resources are constantly decreasing. At this point, it very important to be able benefit from the sun, which main source, with minimum damage environment. It possible produce electricity directly sunlight through PV panels. Due limited efficiency of these panels, MPPT algorithms always required. In study, Sliding Mode Control (...

Three-dimensional shell-like structures can be obtained spontaneously at the microscale from self-folding of 2D templates rigid panels. At least for simple structures, motion each panel is consistent with a Brownian process and folding occurs through sequence binding events, where pairs panels meet specific closing angle. Here, we propose lattice model to describe dynamics self-folding. As an e...

Ballast water systems are an indispensable part of the installation immersed tunnels and utilized to increase or reduce total weight tunnel elements in processes floating transportation, mooring sinking. Traditional ballast generally utilize rigid tanks, which consist retaining walls made steel-wood parts, for supply discharge. However, there many drawbacks traditional system based on tanks. Fo...

The article briefly shows how to estimate the safety of recreational water slides by numerical analysis of motion of the users. There are presented: mathematical description of a typical water slides geometry, simplified model of a sliding person, model of contact between the user and the inner surface of the slide, equations of motion written for a rigid body with 6 degrees of freedom and fina...

The classical problem of rebound is usually treated by assuming that the colliding bodies are rigid and that the coefficient of friction, ~ , is constant. Two contact states can be distinguished: slidinq, in which the ratio of friction force to normal force is equal to ~ , and rolling, in which the friction force is zero. If sliding gives way to rolling during impact, the friction force will fa...

Shoulder geometry of tool plays an important role in friction-stir welding because it controls thermal interactions and heat generation. This work is proposed and developed a coupled rigid-viscoplastic numerical modeling based on computational fluid dynamics and finite element calculations aiming to understand these interactions. Model solves mass conservation, momentum, and energy equations in...

A bar-slider framework is a bar-joint framework a part of whose joints are constrained by using line-sliders. Such joints are allowed to move only along the sliders. Streinu and Theran proposed a combinatorial characterization of the infinitesimal rigidity of generic bar-slider frameworks in two dimensional space. In this paper we propose a generalization of their result. In particular, we prov...

A novel, lightweight solar panel design is described incorporating the best features from three separate areas of development: 1) advanced solar cells 2) light weight, flexible blanket technology and 3) deploment by inflation. inflatable framing structure or torus within which the panel remains suspended. Development of such an Inflatable Torus Solar Array Technology (ITSAT), is well underway [...