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Cioboata D.,The National Institute of Research and Development in Mechatronics and Measurement Technique | Abalaru A.,The National Institute of Research and Development in Mechatronics and Measurement Technique | Stanciu D.,The National Institute of Research and Development in Mechatronics and Measurement Technique | Cristian L.,The National Institute of Research and Development in Mechatronics and Measurement Technique | Ghionea I.,Polytechnic University of Bucharest
Romanian Review Precision Mechanics, Optics and Mechatronics | Year: 2015

This paper presents some considerations on the development of a technological system for profiling/ re-profiling and measurement the profile of the railway wheel sets in order to improve maintenance and security of railway transport. Lathes for reshaping the wheels and wheel sets of the railway vehicles are diversified and modernized in accordance with the requirements of railway transport. The paper presents some considerations on modernization of a conventional lathe with two working units by adaptation of CNC equipment for driving and measuring simultaneous both wheels on an axle. On radial sledge of each working units, on which are mounted the profiling tools, in the immediate proximity of them, are placed the measurement systems in order to determine the axial position of lateral internal faces of the wheels, the diameters of the wheels and the main geometrical parameters of the rolling profiles. The measurements are done before re-profiling to determine the wear of the profile and choice the diameter and the profile of the wheels after reshaping and after processing, to determine the conformance with specifications. © 2015, The Romanian Review Precision Mechanics, Optics & Mechatronics, All Rights Resereved. Source


Ganatsios S.,University of Macedonia | Spanu A.,Polytechnic University of Bucharest | Dontu O.,Polytechnic University of Bucharest | Besnea D.,Polytechnic University of Bucharest | And 2 more authors.
Romanian Review Precision Mechanics, Optics and Mechatronics | Year: 2011

The self centering grasping mechanisms aim to improve the positioning accuracy of the object movement. The paper presents the FEM method applied to such mechanism using compliant joints with elastic properties. We have studied the tensions and displacements for the three dimensional model and the experimental results achieved the goal of our work. Source


Ilie I.,The National Institute of Research and Development in Mechatronics and Measurement Technique
Romanian Review Precision Mechanics, Optics and Mechatronics | Year: 2015

The present paper identifies specific elements of sustainable development concept and analyzes important companies in the most representatives areas represented in Romania. The paper also identified fields of companies activity, in particular the areas of production, and analyzed the evolution of the turnover and the company’s strategy on sustainable development. Finally, conclusions are presented based on national, European and international strategies but also based on items identified in the strategies of companies analyzed. © 2015, Editura Cefin. All rights reserved. Source


Mihaela M.A.,Polytechnic University of Bucharest | Daniel C.C.,Polytechnic University of Bucharest | Octavian D.G.,Polytechnic University of Bucharest | Gheorghe G.I.,The National Institute of Research and Development in Mechatronics and Measurement Technique
Romanian Review Precision Mechanics, Optics and Mechatronics | Year: 2013

In this paper are presented the theoretical and mathematical relationships which describe how can be obtained and make a control of the dynamic parameters of a m/k/c system by replacing the mechanical dynamic absorber with an electro-mechanical system, consisting of an electrodynamic actuator and an external electric circuit. The technical solution is evaluated in terms of effectiveness and efficiency of the control of dynamic parameters of the system. Some solutions for the control of dynamic parameters are concisely presented, indicating the limitations and difficulties in their practical application. The paper presents a mathematical model of a simple m/k/c system, with a system of equations describing the dynamics of the system in conditions in which on the object to be isolated from external vibration action, act a disturbing force. The system of equation is sufficiently simple but also comprehensive to be useful in the study of the dynamic behavior of the system, ie to design a convenient and optimal automatic control strategies. The analysis of technical solutions that can be applied to control the dynamic parameters of the m/k/c system (the change of mechanical parameters of constituent elements of the system or the use of a purely mechanical dynamic absorber) show that they are complicated and difficult to apply in practice. These solutions ensure a reliable operation of the system only in very tight limits of dynamic conditions, which is not convenient for situations in which the system is running out of the limits set by design or when transitional regimes represent a significant percentage. The solution in which the purely mechanical dynamic absorber or the change of parameters of the purely mechanical elements in the structure of the m/k/c system is repaced with an electrodynamic actuator connected across an external electric circuit, composed of resistors, capacitors and inductors of different values, allows a greater flexibility in adjusting the control parameters of the system. A large part of the paper is dedicated to presenting how the introduction of the electrodynamic actuator and his external electrical circuit is equivalent to the action of mechanical dynamic absorber. In the contents of the paper are highlighted similarities between the action and the effect of dynamic absorber elements (an additional mass, additional spring constant and viscous damping constant, additional viscous damper) and the influence of external electric circuit (electrical resistance, capacitor and inductor). From the deducted mathematical relationships results that the replacement of the mechanical dynamic absorber with the electrodynamic actuator and his external electric circuit is a good solution for controlling the dynamic parameters of the m/k/c system, the whole system acquiring the flexibility specific for electrical applications, with the possibility of quickly and effectively change of the control parameters of the system. The electrodynamic actuator and his external electric circuit acts like a bidirectional converter of the mechanical energy into electrical energy and vice versa, adjustable within certain limits. The electrodynamic actuator and the electrical components of the external circuit can be a passive control (constant parameters), a semi-active control (parameters adapted in steps) or active control (continuously variable parameters, adjusted at the operational conditions) to control the dynamic parameters of the m/k/c basic system. The results and conclusions presented in this paper allow indepth study, both theoretical and practical, of the technical solution of the introduction in the structure of an m/k/c system of an electrodynamic actuator and his specific electro-mechanical components and electrical control. © 2013, Editura Cefin. All rights reserved. Source


Cioboata D.,The National Institute of Research and Development in Mechatronics and Measurement Technique | Dontu O.,Polytechnic University of Bucharest | Besnea D.,Polytechnic University of Bucharest | Ciobanu R.,Polytechnic University of Bucharest | Soare A.,Science COMIS SRL
Romanian Review Precision Mechanics, Optics and Mechatronics | Year: 2015

This paper presents the integration of rings for bearings control in manufacturing technology to ensure the bearings quality, providing information on processes, and process control by realizing a flexible, open architecture mechatronic equipment for controlling multi-parametric dimensional and geometric rings surfaces of roller bearings with balls and rollers.This equipment will be developed under Partnerships in Priority Areas Programme - PNII supported by MEN-UEFISCDI, in the project PN II-PT- PCCA-2013-4-1671. © 2015, Editura Cefin. All rights reserved. Source

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