We consider a circular arch of thickness ε and curvature r−1 whose elastic deformations are described by a 2×2 system of linear partial differential equation. The system of the type y′′ + Ay = 0,y = (y1, y3) involves the tangential y1 and normal y3 component of the arch displacement. We analyze in this work the null controllability of these two components by acting on the boundary through a Dir...

This paper presents a geometric gait design and optimization framework for an idealized model of a planar starfish-inspired robot with curvature-controlled soft actuator arms. We describe the range of motion for each arm under the assumption of constant curvature along the length. Two modes of attachment of the ends of the arms to the ground are considered: fixed in position and orientation, an...

an analytical nonlinear stress-strain model and a microscopic damage index for confined and unconfined concretes together with a macroscopic damage index for reinforced concrete (rc) structures under cyclic loading are proposed. in order to eliminate the problem of scale effect, an adjustable finite element computer program was generated to simulate rc structures subjected to cyclic loading. by...

We investigated the sideways displacement of recti muscles with the eye in various gaze-positions by making computed tomographic (CT) scans in a plane perpendicular to the muscle cone, posterior to the globe. We found no consistent sideways displacement of the horizontal recti in the up or down gaze or the vertical recti in the left or right gaze. We found a substantial displacement, however, o...

We have fabricated a string-shaped actuator called “Active string” that has high contractile displacement/force by accumulating thin pneumatic artificial muscles using the string production process. However, displacement control of active is challenging because general bulky and rigid sensors are not suitable for sensor element string. Therefore, in this report, flexible optical fiber combined ...

The study of pore level displacement of immiscible fluids has scientific appeal as well as many applications, notably in oil reservoir engineering and in subsurface environmental engineering. Pore network models have been used for numerical simulation of fluid displacement over relevant physical volume sizes. An accurate description of the mechanics of displacement could significantly improve t...

Cracked concrete arch dam’s behavior due to moderate earthquake magnitude and water pressure variation was investigated. Plain used cast the models with 45 Mpa design strength. A shake table has been planned, manufactured, built create a dynamic testing facility. The experimental work included of four scaled-down dams’ models, which is divided into two groups, each group contains different degr...

The flame forming process is widely used to manufacture ship hull plates. The saddle-shaped surfaces have different curvatures in perpendicular angles of planes and the manufacturers face an anti-clastic curvature. In this article, the manufacturing of saddle-shaped surfaces utilizing the flame forming process is investigated. The spiral irradiating scheme is used for forming. In order to study...