Entity

Time filter

Source Type


Baldovin S.,Polytechnic University of Bucharest | Baldovin D.,Institute of Solid Mechanics of Romanian Academy
UPB Scientific Bulletin, Series D: Mechanical Engineering | Year: 2015

The vibration level and the comfort of the vehicles can be improved by replacing its passive suspension by a controlled semi-Active or active suspension. Various semi-Active control algorithms have been suggested in the past, some of them are groundhook strategies. Many of these studies approach systems with more degrees of freedom. In this paper is presented the groundhook control strategy for SDOF dynamical system with harmonic base excitation in comparison with an undamped and linear damped dynamic system. The comparison is made by numerical simulation in Matlab Simulink for two important transfer functions of those dynamic systems. The results show that the semi-Active control for sinusoidal excitation provides better results than the classic suspension. Source


Brisan C.,Technical University of Cluj Napoca | Vasiu R.-V.,Technical University of Cluj Napoca | Munteanu L.,Institute of Solid Mechanics of Romanian Academy
Transportation Research Part C: Emerging Technologies | Year: 2013

This paper introduces a module-based algorithm for building roads for the virtual environment. The road profiles are developed using road modules designated for driving simulator platforms. These modules developed from mathematical representations of the road geometry are linked together using specific connectivity conditions in accordance with the current road design standards. Such modular approach can be useful to build a low-cost virtual reality environment with an increased degree of realism for driving simulators and higher user flexibility. © 2012 Elsevier Ltd. Source


Vladareanu V.,Polytechnic University of Bucharest | Schiopu P.,Polytechnic University of Bucharest | Vladareanu L.,Institute of Solid Mechanics of Romanian Academy
UPB Scientific Bulletin, Series A: Applied Mathematics and Physics | Year: 2014

The paper presents advanced method for solving contradictory problems of hybrid position-force control of the movement of walking robots by applying an "Extension Set". Starting from the extension distance defined by Prof. Cai Wen, the founder of Extenics, there are determined the 2D space dependent function on position and force in relation to standard positive field on position respective on force. The generalization of the extension distance and dependent function using Extenics Multidimensional Theory eliminates the crisp logic matrix of Cantor logic which describes the position-force sequences. Thus was developed an optimization method for hybrid position-force control which ensures positioning precision and robot motion stability on rough terrain. Source


Sandru O.I.,Polytechnic University of Bucharest | Vladareanu L.,Institute of Solid Mechanics of Romanian Academy | Schiopu P.,Polytechnic University of Bucharest | Vladareanu V.,Polytechnic University of Bucharest | Sandru A.,Polytechnic University of Bucharest
UPB Scientific Bulletin, Series A: Applied Mathematics and Physics | Year: 2013

This paper will "extend" Extenics Theory from the one-dimensional case known at present to the n-dimensional case, n > 1. Due to the importance of this theory in solving multiple practical problems, the extension presented in this paper brings a maximum of technical consistency to the applicative field. Source


Hanawa T.,Tokyo University of Agriculture and Technology | Deng M.,Tokyo University of Agriculture and Technology | Vladareanu L.,Institute of Solid Mechanics of Romanian Academy
International Conference on Advanced Mechatronic Systems, ICAMechS | Year: 2013

In this paper, a operator-based robust nonlinear control system for nonlinear plants with uncertain backlash is proposed by using power integrator. Firstly, a backlash model including uncertainties in its threshold is proposed. Secondly, a robust nonlinear control system is designed by using power integrator. Finally, the effectiveness of the proposed control system is confirmed by simulations. © 2013 IEEE. Source

Discover hidden collaborations