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作者： Antonya, Csaba Transilvania University of Brasov Department of Product Design and Robotics 29 Eroilor Bldv Brasov Romania

ISBN: (纸本)9781457718069

The project proposes the development of a cognitive simulation system for the interaction between human and virtual objects, focusing on obtaining an as natural as possible visual and haptic feedback and also considering the human factor. The applications which are targeted by this simulation engine are virtual prototyping of mechanical systems (mechanisms) and the development of a new environment for designing in virtual reality. In these applications the force feedback, as an interaction modality plays a crucial role, and when it comes to the evaluation of the forms a personalized and adapted to user's requirements, fully immersive virtual environment is decisive. In the present, these design and testing procedures are accomplished by the use of complex simulations with engineering software and by testing real prototypes, but the new envisaged interface will permit the user to feel, to see and to interact in a direct and natural way with the concepts of the product in a stereoscopic and fully immersive environment. In order to be able to develop the haptic feedback and the visualization systems one has to understand the sensorial characteristics of the human body and to develop a computer controlled system which enables the natural interaction with virtual environments Introduction. © 2011 Scientific Assoc Infocomm.

关键词： Virtual reality

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Gait intention analysis for controlling virtual reality walking platforms

Gait intention analysis for controlling virtual reality walk...

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作者： Dascalu, Laura Madalina Stavar, Adrian Talaba, Doru Product Design and Robotics Department Transilvania University of Brasov Bulevardul Eroilor nr. 29 500036 Brasov Romania

ISBN: (纸本)9783642191695

Simple human gait can be difficult, unfeasible and not always practical in Virtual Reality, because of spatial and technological limitations. For 3D virtual environment travelling, different walking platforms have been developed in the last few years, but navigation using most of them is far from bringing naturalness to the user's movements. Users sometimes are unsecure and they are trying to adapt and to correct any irregularities they feel. Our research is focused on specific walking patterns that characterize the intention of walking: starting walking with a certain speed, maintaining a desired speed, accelerated walking, decelerated walking, stopping. In laboratory conditions, using a motion capturing system, these behaviors were reproduced, measured and analyzed. © 2011 IFIP International Federation for Information Processing.

关键词： Virtual reality

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Dynamic analysis of a half-car model with active suspension

Dynamic analysis of a half-car model with active suspension

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2nd International Conference on Circuits, Systems, Control, Signals, CSCS'11

作者： Alexandru, CǍtǍlin Alexandru, Petre Product Design and Robotics Department Transilvania University Brasov BV 500036 Romania Transilvania University Brasov BV 500036 Romania

ISBN: (纸本)9781618040350

Passive suspension systems of the motor vehicles have inherent limitations as a consequence of the choice of elastic and damping characteristics to ensure an acceptable behavior for the entire working frequency range. In this paper, the design and simulation of an active suspension system is approached. The idea is to transform the conventional passive suspension into an active one, by using a counter-force system (feedback control, which is missing in the passive suspensions). The analysis is performed for a half-car model, which corresponds to the suspension system of the rear axle. The response of the active suspension is compared with the passive suspension, in the same testing conditions, observing major improvements in the dynamic behavior (in terms of stability and comfort).

关键词： Automobile suspensions

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Estimating Clear Sky Solar Radiation Using Linke and Angstrom Turbidity Coefficients in Romania

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Journal of Energy and Power Engineering 2011年第1期5卷 29-41页

作者： E. Eftimie Department of Product Design and Robotics Transilvania University Brasov 500036 Romania

The renewable systems design software and building energy simulation software for energy efficient buildings, use as a main input the solar radiation. The implementation of such systems in the urban environment requires accurate meteorological data for the interest area. The existence of a small number of weather stations that to offer data with regard to solar radiation as well as the limited access to these, makes necessary the conceiving of some more accurate estimation mathematical models for all climatological parameters. The present paper proposes a study of the Linke and AngstrOm turbidity coefficients, for Brasov urban area, with the purpose of a more accurate solar radiation simulation. Models performance is analyzed using the root mean square error （RMSE）, the mean bias error （MBE）, the mean percentage error （MPE） and the t-statistic.

关键词： Linke turbidity AngstrOm turbidity total radiation diffuse radiation MBE MPE RMSE t-statistic.

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Virtual reality in product design and robotics

Virtual reality in product design and robotics

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作者： Talaba, Doru Antonya, Csaba Stavar, Adrian Georgescu, Victoria Cristina Product Design and Robotics Department Transilvania University of Brasov Brasov Romania Electronics and Computers Department Transilvania University of Brasov Brasov Romania

ISBN: (纸本)9781457718069

This paper presents the current state of the art and developments in the CAD/CAE and VR research laboratory at Transilvania University in the framework of the project VEGA. First the project context is presented, with the major objectives and work teams designed for researching various aspects of VR applications. Then, the VEGA research infrastructure is presented, with performances and facilities, especially pieces of equipment that have been developed in the department. A flexible solution is presented for the large scale 3D visualization systems, called holo-CAVE. In the second part of the paper, the applications developed are presented for the various fields of engineering and architectural design tasks: design, simulation, virtual testing, virtual navigation, manufacturing and Augmented Reality. All applications prove the use of VR technology. © 2011 Scientific Assoc Infocomm.

关键词： Virtual reality

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INCOGNITO: Cognitive interaction between human and virtual environment for engineering applications

INCOGNITO: Cognitive interaction between human and virtual e...

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International Conference on Cognitive Infocommunications (CogInfoCom)

作者： Csaba Antonya Department of Product Design and Robotics Transilvania University of Brasov Brasov Romania

关键词： Solid modeling Haptic interfaces Virtual environments Visualization Adaptation models Stereo image processing

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designing the tracking system for a string of photovoltaic modules

Designing the tracking system for a string of photovoltaic m...

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International Conference on Optimization of the Robots and Manipulators（OPTIROB 2011）

作者： Nicoleta-Irina Tatu Cǎtǎlin Alexandru Product Design and Robotics Department Transilvania University of Bra ov Romania

This paper presents the virtual prototype of the mono-axis tracking system used for improving the efficiency of a string of photovoltaic modules. The solar tracker simultaneously changes the daily position of the modules, using a linear actuator that drives a rack-pinion mechanism. The key in optimizing the tracking system is to maximize the received solar radiation and to minimize the energy consumption for tracking. The virtual prototype is developed using a digital platform which integrates the following software solutions: CATIA - for the solid modeling of the components, ADAMS - for developing the mechanical model in MBS (Multi-Body Systems) concept, and MATLAB/Simulink - for the control system design.

关键词： photovoltaic module, string, tracking mechanism, mechatronic system, virtual prototype.

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Software Module for Objects Shape Tracing and Recognition Before Gripping

Software Module for Objects Shape Tracing and Recognition Be...

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International Conference on Optimization of the Robots and Manipulators（OPTIROB 2011）

作者： Ionel Staretu Alexandru Itu Product Design and Robotics Department Transilvania University of Brasov Brasov Romania

This paper presents the general structure, implementation features and a software module for tracing, visualization, shape recognition, measurement and efficiency evaluation for 3D model generation of objects to grip by an anthropomorphic gripper. Viewing is possible with an advanced video camera and shape recognition is possible through classifiers method. After setting the object shape, the gripper will approach the target, and its displacement is measured. Based on measurements of the distance between the initial point and a second intermediate point, you can do calculations aimed at object size and remaining distance to it. Implementation, and how to work with the software designed are possible in several steps that are specified and described. The performance evaluation of the software system is based on a series of external factors, the most important being: light conditions;quality of video device;capture size;the human factor through a series of experiments focused on the system's ability to cope with external factors above mentioned.

关键词： image processing, shape recognition, software module, anthropomorphic gripping.

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A closed-loop drop-foot correction system with gait event detection from the contralateral lower limb using fuzzy logic

A closed-loop drop-foot correction system with gait event de...

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10th IEEE International Workshop on Biomedical Engineering, BioEng 2011

作者： Moulianitis, Vassilis C. Syrimpeis, Vasileios N. Aspragathos, Nikolaos A. Panagiotopoulos, Elias C. Department of Product and Systems Design Engineering University of the Aegean 84100 Hellas Greece Robotics Group Mechanical and Aeronautics Engineering Department University of Patras 26500 Hellas Greece Department of Orthopedics University Hospital of Patras 26501 Hellas Greece

ISBN: (纸本)9781457705526

In the present paper a closed loop fuzzy control scheme for the correction of the drop-foot syndrome is presented. The control scheme is based on EMG signals from the contralateral, unimpaired lower limb and its efficiency is tested by the application of the controller to a simulated bipedal locomotion with one lower limb suffering from the Drop-Foot Syndrome. Two are the major characteristics of the controller: identification of the phase where the stimulation must be provided using EMG signals from the contralateral, unimpaired lower limb and correction of the excitation signal according to the phase using EMG signals from the collateral impaired lower limb. © 2011 IEEE.

关键词： Controllers

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Force feedback generation for string based haptic systems

Force feedback generation for string based haptic systems

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2011 World Congress on Engineering and Technology(CET 2011)

作者： Csaba Antonya Zoltán Rusák Department of Product Design and Robotics Transilvania University of Brasov Brasov Romania Department of Design Engineering Delft University of Technology Delft The Netherlands

In this paper the force feedback generation is investigated for improving the quality of the haptic feedback in virtual reality applications. The chosen structure for the force feedback device is tension based and characterized by 3 degrees of freedom (force-feedback only) and 6 degrees of freedom (force and torque feedback). Feelings in general are not easy to simulate by computer technology and haptic information can be distorted by incorrect distribution of the tension forces in the strings. In this paper a new method is suggested, in which the number of computation step is fixed and the amount of calculation is low and always limited.

关键词： force feedback haptic virtual reality optimisation string

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