DSpace Collection:
https://hdl.handle.net/20.500.12815/19
2024-03-25T08:49:21ZContactless automated manipulation of mesoscale objects using opto-fluidic actuation and visual servoing
https://hdl.handle.net/20.500.12815/52
Title: Contactless automated manipulation of mesoscale objects using opto-fluidic actuation and visual servoing
Authors: Vela, Emir; Hafez, Moustapha; Régnier, Stéphane
Abstract: This work describes an automated opto-fluidic system for parallel non-contact manipulation of microcomponents. The strong dynamics of laser-driven thermocapillary flows were used to drag microcomponents at high speeds. High-speed flows allowed to manipulate micro-objects in a parallel manner only using a single laser and a mirror scanner. An automated process was implemented using visual servoing with a high-speed camera in order to achieve accurately parallel manipulation. Automated manipulation of two glass beads of 30 up to 300 μm in diameter moving in parallel at speeds in the range of mm/s was demonstrated.2014-05-01T00:00:00ZAutomated vision-based system for parallel contactless micromanipulation
https://hdl.handle.net/20.500.12815/51
Title: Automated vision-based system for parallel contactless micromanipulation
Authors: Vela, Emir; Hafez, Moustapha; Regnier, Stephane
Abstract: This paper presents the automated parallel noncontact manipulation of glass beads ranging from 30 up to 300 μm in size under water. Non-contact micromanipulation is performed by generating controllable laser-induced thermocapillary flows that are capable of dragging the beads. Automated manipulation process is achieved with visual servoing in order to accurately manipulate the beads in a parallel and high-speed manner. Image correlation allowed to detect the bead positions and to provide these positions to a mirror scanner that addressed the IR laser beam at a certain position from the bead. By scanning the laser beam from one bead to another, automated parallel manipulation of beads at speeds in the range of mm·s-1 was demonstrated.2013-11-01T00:00:00ZA simple and accurate generalized shear deformation theory for beams
https://hdl.handle.net/20.500.12815/50
Title: A simple and accurate generalized shear deformation theory for beams
Authors: Mantari, J.L.; Yarasca, J.
Abstract: This paper presents a static analysis of functionally graded (FG) single and sandwich beams by using a simple and efficient 4-unknown quasi-3D hybrid type theory, which includes both shear deformation and thickness stretching effects. The governing equations and boundary conditions are derived by employing the principle of virtual works. Navier-type closed-form solution is obtained for several beams. New hybrid type shear strain shape functions for the inplane and transverse displacement were introduced in general manner to model the displacement field of beams. Numerical results of the present compact quasi-3D theory are compared with other quasi-3D higher order shear deformation theories (HSDTs).2015-12-01T00:00:00ZRefined and generalized hybrid type quasi-3D shear deformation theory for the bending analysis of functionally graded shells
https://hdl.handle.net/20.500.12815/49
Title: Refined and generalized hybrid type quasi-3D shear deformation theory for the bending analysis of functionally graded shells
Authors: Mantari, J.L.
Abstract: The closed-form solution of a generalized hybrid type quasi-3D higher order shear deformation theory (HSDT) for the bending analysis of functionally graded shells is presented. From the generalized quasi-3D HSDT (which involves the shear strain functions “f(ζ)” and “g(ζ)” and therefore their parameters to be selected “m” and “n”, respectively), infinite six unknowns' hybrid shear deformation theories with thickness stretching effect included, can be derived and solved in a closed-from. The generalized governing equations are also “m” and “n” parameter dependent. Navier-type closed-form solution is obtained for functionally graded shells subjected to transverse load for simply supported boundary conditions. Numerical results of new optimized hybrid type quasi-3D HSDTs are compared with the first order shear deformation theory (FSDT), and other quasi-3D HSDTs. The key conclusions that emerge from the present numerical results suggest that: (a) all non-polynomial HSDTs should be optimized in order to improve the accuracy of those theories; (b) the optimization procedure in all the cases is, in general, beneficial in terms of accuracy of the non-polynomial hybrid type quasi-3D HSDT; (c) it is possible to gain accuracy by keeping the unknowns constant; (d) there is not unique quasi-3D HSDT which performs well in any particular example problems, i.e. there exists a problem dependency matter.2015-12-01T00:00:00Z