The dynamical behavior study of robotic systems is obtained using multibody dynamics method. The joints met in robots are modeled in different manners. In a robotic joint the energy is lost via hysteretic work and plastic deformation work. The paper presents a comparative study for the results obtained by integration of the equations defining two limit models which describe the impact between two robot parts, modeled by the centric collision between two spheres with loss of energy. The motion equations characteristic for the two models are integrated and for a tangible situation, are presented comparatively, for different values of the coefficient of restitution, the time dependencies of impacting force between the two bodies as well as the hysteresis loops. Finally, an evaluation of the lost work during impact, for the whole range of coefficients of restitution, is completed, together with characteristic parameters of collision: approaching period, complete contact time, maximum approaching and plastic imprint.

In this paper we start from the calculation of the product cost, applying the method of calculating the cost of hour- machine (THM), on each of the three cutting machines, namely: the cutting machine with plasma, the combined cutting machine (plasma and water jet) and the cutting machine with a water jet. Following the calculation of cost and taking into account the precision of manufacturing of each machine, as well as the quality of the processed surface, the optimal decisional version needs to be determined regarding the product manufacturing. To determine the optimal decisional version, we resort firstly to calculating the optimal version on each criterion, and then overall using multiattribute decision methods.

This paper presents synthesis of kinematic model of NAO humanoid robot of Aldebaran Robotics. NAO humanoid robot has complex kinematic structure with 25 active degrees of freedom (DOF). Humanoid system is formed through 5 mutually depended kinematic chains. After that we applied standard aspects of kinematic chains synthesis and Denavit-Hartenberg parameters of each of 5 chains of robotic structure were introduced. Also, mutual relationships between chains were described, as well as their physical and structural dependence. Generated kinematic model will be the starting point for further dynamical modeling of NAO humanoid robot and motion synthesis on actual platform.

Professor Florea Dudita was born in April 12, 1934, in Dejesti, Olt county. Since 1959, he had been working at the Polytechnic Institute of Brasov, since 1990, called ‘Transilvania’ University of Brasov, going through all stages of the academic career, up to professor.

The paper presents the construction and functioning of a new type the harmonic gear transmission named double harmonic gear transmission, which can be used in the construction drives of industrial robots. In the second part of this paper is presented the dynamic analysis of the double harmonic gear transmission, which is based on the results of the numerical simulations of the flexible wheel in case of its deformation with a mechanical wave generator with disc cam. Investigation of dynamic behavior of the flexible toothed wheel was performed by using the finite element method in SolidWorks Simulation software.

This paper focuses on the mobility analysis of spatial and planar manipulators used in amusement parks. In this paper is presented a topological structure analysis for many types of serial and parallel manipulators, referring to the calculation of mobility (degree of freedom) of these types of complex mechanisms. It is used a new formula to calculate the mobility according to the number of drivelines, which are considered having identical operations.

The paper presents the results of the study regarding the need for conflict management in the post-crisis period for the Romanian organisations. The 2008-2013 economic crisis placed the organisations on new coordinates by which a new approach is needed for the management activity. On the one hand, managers should adapt to the new requirements of the market and behaviour of customers, and on the other hand we also need a redefinition and practical solving of conflicts within an organisation.

In robotic system there are frequent situations when on the robotic parts percutions develop. The impact plastic imprints are unique source of data remaining after collision, but complications occur in the analysis and the work models a general impact and presents the manner of processing the experimental data. The paper presents the characteristics occurring in the analysis of the indentation remnant after the oblique impact between a free falling ball and the surface of an inclined metallic prism. A series of difficulties arise while trying to approximate the collision’s imprint profile with a parabola having oblique symmetry axis. Both these impediments and the manner of surmounting them are presented. Finally, the impasse that takes place in the actual analysis of an imprint profile is presented. A first method of surpassing this aspect uses the intrinsic characteristics of osculating circle in a point of the profile is applicable only for smooth signals. The second proposed method is applied to the real signal and provides fine results.

The Electrical Engineering, Electronics and Information Technology Faculty, "Valahia" University of Targoviste, together with the Robotics Society of Romania, Targoviste subsidiary and the Students League, held the 7th edition of the Professional Contest "ROBOTS IN ACTION" on June 5th 2014, starting from 12.00h, in the Faculty hall.