Browsing by Author "Casado, S."
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Item Assembly simulation on collaborative haptic virtual environments(2007) Iglesias, R.; Prada, E.; Uribe, A.; Garcia-Alonso, A.; Casado, S.; Gutierrez, T.; Medical Technologies; PROMETAL; CIRMETALCurrently, Virtual Environments (VEs) are used within engineering industry: physical prototypes or mock-ups are replaced by virtual prototypes. Increasingly, these VEs also allow designers and engineers to carry out assembly/disassembly processes and assembly sequences before any physical prototype is built. Moreover, different designers or engineers, which may be situated in the same or in geographically dispersed locations, often collaborate in the design of products. This allows developing more complex products within a shorter time scale and lowered costs. On the other hand, the utilization of haptic feedback has been found to significantly enhance task performance, for instance, in assembly tasks. In this paper we describe an assembly simulation application on a collaborative haptic virtual environment, where several users interact with virtual models to perform assembly operations within the same virtual scene. The paper also summarizes results achieved with experiments which evaluated different collaborative architectures. Furthermore, it reports on the goals that can be achieved and the limitations for haptic collaborative interaction in each case.Item Computer graphics access for blind people through a haptic and audio virtual environment(2004) Iglesias, R.; Casado, S.; Gutiérrez, T.; Barbero, J. I.; Avizzano, C. A.; Marcheschi, S.; Bergamasco, M.; PROMETAL; CIRMETALThis paper describes a new Haptic & Audio Virtual Environment to allow visually impaired people to have access to the three-dimensional graphic computer world through the sense of touch (using a new dual-finger haptic interface) and augmented by audio output and voice commands. Such system has been developed within the European project "GRAB". The new system provides an integrated platform for the design and development of audio-haptic applications in different fields (architecture, art, aeronautics, medicine,..). In order to demonstrate the validity of the approach, the project was specifically focused on the development of three applications for visual impaired people: an adventure game, a city map explorer and a chart explorer. Both the new environment and the applications were tested by visually impaired people with different profiles (congenitally blind, advantageously blind, partially sighted,..) to evaluate the usefulness and potential of these developments. The results of this validation confirm the validity of the system. Overall, it seems the GRAB system is feasible for these kinds of applications, although some features require some adjustments to create future usable tools.Item IMA-VR: A multimodal virtual training system for skills transfer in Industrial Maintenance and Assembly tasks(2010) Gutiérrez, T.; Rodríguez, J.; Vélaz, Y.; Casado, S.; Suescun, A.; Sánchez., E. J.; CIRMETAL; PROMETALIndustrial Maintenance and Assembly is a very complex task involving both cognitive skills (procedural skills) and motor skills (fine motor control and bi-manual coordination skills). This paper presents a controlled multimodal training system, for transferring the motor and cognitive skills involved in these tasks. The new platform provides different multimodal aids and learning strategies that help and guide the users during their training process. One of the main features of this system is its flexibility to adapt itself to the task demands and to the users' preferences and needs supporting different configurations. To address bi-manual operations the platform offers different alternatives, one of them is a set-up composed of a haptic device to track the motion of the operator's dominant hand and simulate the physical interaction within the virtual environment, together with a marker-less motion capture system to track the motion of the other hand in real time.Item New implementation of the boundary element method using a B-rep geometric modeller(1996) Casado, S.; Longo, A.; PROMETAL; Centros PRE-FUSION TECNALIA - (FORMER)In this paper, a new implementation of the Boundary Element Method using an interface with a B-rep geometric modeller, is presented. The main advantage of this approach is the capability to work with an exact representation of the geometry of the model. The analyzer is able to get, from a B-rep model representation, all the geometric information; so it does not need to mesh the model. The method is applied to 3D potential problem - Laplace's equation, but it is straight forward to apply to other problems (e.g. mechanical). Numerical results, for several electrostatics examples are shown.Item Optimisation of electromagnetic design using HPCN(Springer Verlag, 1998) Riley, C. P.; McLatchie, R. C.F.; Janssen, R.; Longo, A.; Gutiérrez, T.; Casado, S.; Simkin, J.; Brochet, P.; Molinari, G.; Alotto, P.; Lemoine, J. F.; Drago, G.; Sloot, Peter; Hertzberger, Bob; Bubak, Marian; Centros PRE-FUSION TECNALIA - (FORMER); CIRMETAL; PROMETALThe development of HPCN and portable parallel implementations through BSP has encouraged developers and users of electromagnetic design software to address both the “grand challenge” problems and replace analysis of a design with synthesis. The paper describes the approach adopted by the EPOCH consortium.