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Low cost device for experimental tests of electrorheological fluids 6

Low cost device for experimental tests of electrorheological...

引用

6th International Conference on Advanced Concepts in Mechanical Engineering, ACME 2014

作者： Chetran, Beniamin Mandru, Dan Technical University of Cluj-Napoca Department of Mechatronics and Machine Dynamics Cluj- Napoca Romania

ISBN: (纸本)9783038352716

Electrorheological fluids (ERFs) can change their shear stress and shear rate as a function of the electric field intensity thus, such fluids acts as Newtonian fluids, if no electric field is applied and, become non Newtonian fluids if the presence of an electric field. In the last years, a growth interest is manifested for incorporating smart fluids into structures, as clutches or dumpers. The ERFs shear rate and shear stress must be determined at the moment of designing such mechanical structures. The fluids viscosity is studied by aid of commercially available viscosimeters or rheometers, these do not have the possibility to apply an electric field to the studied fluids. The ER fluids must be studied into specific electric field intensity. This paper presents: a low cost experimental rheometer and experimental results obtained form a study of several commercially available ERFs. © (2014) Trans Tech Publications, Switzerland.

关键词： Electrorheological fluids

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Influence of real car longitudinal acceleration regime on the vertical vibrations of a dynamic car simulator 12

引用

ASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis, ESDA 2014

作者： Dumitriu, Dan N. Brişan, Cornel Munteanu, Ligia Institute of Solid Mechanics Romanian Academy Bucharest Romania Technical University of Cluj-Napoca Cluj-Napoca Romania

ISBN: (纸本)9780791845837

For dynamic car simulators, it is obvious that the longitudinal motion cannot be fully reproduced, the possibility to simulate longitudinal motions being generally reduced to less than 1m. In our case, a four post shaker is intended to be built as dynamic car simulator. Each post shaker, one under each car wheel, is aimed to generate mainly vertical vibrations and lateral motion. Since the displacements/motion in the longitudinal direction can only be partially reproduced, our problem was how to compensate the impossibility of fully reproducing the longitudinal motion by at least taking into account the influence of the longitudinal motion on the vertical vibrations. In this paper a simplified 4 DOF "bicycle" model is used for vertical dynamics, instead of a 7 DOF full car vertical dynamics model, which will be considered in a further study. On the other hand, the vertical vibrations are different for the same car riding on the same road, but for different acceleration regimes: 1) null acceleration (e.g., 60km/h constant speed);2) uniform acceleration from 10 to 110 km/h (during 8 seconds), followed by uniform deceleration from 110 to 10 km/h (during another 8 sec), then uniform acceleration from 10 to 60 km/h (during the last 4 sec of the simulation). In order to reproduce in the dynamic car simulator the vertical vibrations of the above-mentioned longitudinal motion regimes (involving displacements of tens of meters), the following steps are proposed: a) direct dynamics CARSIM computer simulations of the car motion and its interaction with the road;b) inverse dynamics of car vertical model (4 degrees of freedom), using as input the following parameters computed in step a): the vertical displacements and velocities of the sprung mass and of the front and rear wheel centers as well as the pitch angle of the sprung mass and its rate. These inverse dynamics computer simulations are performed using an inhouse Matlab software programming only the 4-DOF vertical car/road

关键词： Acceleration

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Modeling and simulation of the gas absorption process in the liquid phase

Modeling and simulation of the gas absorption process in the...

引用

International Conference on Aerospace, Robotics, Manufacturing Systems, Mechanical Engineering, Neurorehabilitation and Human Motility, ICMERA 2014

作者： Ungurean, Mihaela-Ligia Murean, Vlad Abrudean, Mihail Clitan, Iulia Coloi, Tiberiu Technical University of Cluj-Napoca Physics and Chemistry Department 103-105 Muncii Street Cluj-Napoca Romania Technical University of Cluj-Napoca Automation Department 26-28 Bariiu Cluj-Napoca Romania

ISBN: (纸本)9783038352747

In this paper, a solution for the modeling and simulation of the gas absorption process in a liquid is presented. In the modeling procedure, the technological process is decomposed in two sub-processes connected in series, the first sub-process being considered a lumped parameter one, respectively the second sub-process being considered a distributed parameter one. In order to simulate, with a high accuracy, a process that includes in its structure a distributed parameter subprocess, an original method based on the matrix of partial derivatives of the state vector, associated with Taylor series, is used. The modeling-simulation procedure introduces the premise to approximate the concentration value of the gas absorbed in liquid, in relation to the initial pressure from the reactor, respectively the premise of including the technological process in a concentration control structure. © (2014) Trans Tech Publications, Switzerland.

关键词： Liquids

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Formulations in advanced dynamics of mechanical systems 2

Formulations in advanced dynamics of mechanical systems

引用

2nd Conference on Mechanisms, Transmissions and Applications, MeTrApp 2013

作者： Negrean, I. Schonstein, C. Kacso, K. Duca, A. Department of Mechanical Systems Engineering Technical University of Cluj-Napoca Cluj-Napoca Romania

ISBN: (纸本)9789400774841

In the paper, in keeping with the fact that the robots are complex mechanical systems, on the basis of matrix exponentials, some notions applicable in advanced dynamics of mechanical systems, as well as variational principle from analytical mechanics will be analyzed. There will be presented the D’Alembert- Lagrange principle, written in the generalized form, and a few formulations on the Hamilton’s variational principle. On the basis of these aspects, by using of important mass distribution parameters, there will be expressed the kinetic energy and first and second order of the acceleration energy, the last one into a new formulation. © Springer International Publishing Switzerland 2014.

关键词： Kinetic energy

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Simulation and control of the vehicles movement in the case of the overtaking procedures

Simulation and control of the vehicles movement in the case ...

引用

International Conference on Aerospace, Robotics, Manufacturing Systems, Mechanical Engineering, Neurorehabilitation and Human Motility, ICMERA 2014

作者： Murean, Vlad Groza, Adrian Iancu, Bogdan Clitan, Iulia Technical University of Cluj-Napoca Automation Department 26-28 Bariiu Street Cluj-Napoca Romania Technical University of Cluj-Napoca Computer Science Department 26-28 Bariiu Street Cluj-Napoca Romania

ISBN: (纸本)9783038352747

In this paper, a solution for the simulation and control of the vehicles movement in the case of performing the overtaking procedures is proposed. In order to design the simulation system, the mathematical modeling of the vehicle movement is made, the obtained model being based on the state space representation. Also, the real-time working of the simulator is based both on the information obtained through the usage of a communication network between the vehicles and of the GPS-measured position. The main advantage of the proposed system consists in assisting the driver to perform a correct and a safe overtaking. Another original element presented in this paper is that the vehicle movement model is included in a control structure, resulting the possibility that the overtaking is performed with a higher efficiency. The mathematical model, respectively the simulation system were tested and validated through some simulations associated to an overtaking scenario, simulations presented in this paper, too. © (2014) Trans Tech Publications, Switzerland.

关键词： Vehicles

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A proposal for a driving system of a four DOF rehabilitation exoskeleton

引用

International Conference on Advancements of Medicine and Health Care through Technology, MEDITECH 2014

作者： Chetran, Beniamin Tătar, O. Noveanu, S. Mândru, D. Technical University of Cluj-Napoca Department of Mechatronics and Machine Dynamics Cluj-Napoca Romania

ISBN: (纸本)9783319076522

The paper presents a proposal of a four degrees of freedom (DOF) upper limb rehabilitation exoskeleton and its control system which is designed for the control of the serial mechanisms angular position. It contains as an extension, a module for driving of a braking system with smart fluids. The proposed control system is suitable for active and passive exercises. The rehabilitation system is developed for rehabilitation training at home, without a supervision of a qualified person during exercises. © 2014, Springer International Publishing Switzerland.

关键词： Degrees of freedom (mechanics)

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Designing aspects of a frontal - Sinusoidal transmission with balls

Designing aspects of a frontal - Sinusoidal transmission wit...

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2004 ASME International Mechanical Engineering Congress and Exposition, IMECE

作者： Bara, Mircea Department of Mechanisms Fine Mechanics and Mechatronics Technical University of Cluj-Napoca B-dul Muncii 103-105 Cluj-Napoca Romania

The frontal-sinusoidal transmission with balls is a new type of mechanical transmission, that allows movement transmission between two coaxial shafts. In the first part of this paper presents the geometric and kinematics study of the elements of a frontal -sinusoidal transmissions with balls, determining in this way the transmission ratios. In the second part of this paper presents the kinetostatic study of the elements of frontal transmission with balls, determining in this way the force that acts upon these forces which are necessary in the constructive dimensioning. An advantage of this transmission, as compared to other mechanical transmissions, is given by the possibility to obtain more transmission ratios. In case all disks of simple frontal-sinusoidal transmission are moving elements a differential transmission it obtained. Another advantage is given by the possibility of obtaining complex transmissions by series and/or parallel arrangement of frontal transmission simple units. Copyright © 2004 by ASME.

关键词： Mechanical engineering

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Designing aspects of cylindrical transmission

Designing aspects of cylindrical transmission

引用

2006 ASME International Mechanical Engineering Congress and Exposition, IMECE2006

作者： Bara, Mircea Department of Mechanisms Fine Mechanics and Mechatronics Technical University of Cluj-Napoca B-dul Muncii 103-105 Cluj-Napoca Romania

ISBN: (纸本)0791837904

The cylindrical transmission with balls is a new type of mechanical transmission, that allows movement transmission between two coaxial shafts [1]. In the first part of this paper presents the geometric and kinematics study of the elements of cylindrical -sinusoidal transmissions with balls, determining in this way the transmission ratios. In the second part of this paper presents the geometric and kinematics study of the elements of differential cylindrical transmission with balls, determining in this way the transmission ratios. An advantage of this transmission, as compared to other mechanical transmissions, is given by the possibility to obtain more transmission ratios. In case all cylinders of simple cylindrical transmission are moving elements a differential transmission it obtained. Another advantage is given by the possibility of obtaining complex transmissions by series and/or parallel arrangement of cylindrical transmission simple units. Copyright © 2006 by ASME.

关键词： Mechanical engineering

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Hydrogen production by anaerobic digestion of biomass with high lignocellulose content - references selection procedure 6

Hydrogen production by anaerobic digestion of biomass with h...

引用

6th International Conference on Advanced Concepts in Mechanical Engineering, ACME 2014

作者： Teleky, Bernadette EmöKe Balan, Mugur Ciprian Technical University of Cluj Napoca Department of Mechanical Engineering Bd Muncii Cluj-Napoca Romania

ISBN: (纸本)9783038352723

The manuscript presents an objective and rigorous references selection procedure for a literature review concerning the state of the art in the field of bio-hydrogen production by anaerobic digestion of biomass with high lignocellulose content. The references selection procedure is presented in detail, with stages and different including and excluding criteria. The scientific databases and the key words used for their interrogation are also presented. The methodology of references selection consists of the following steps: automatic scientific databases interrogation, manual selection of references from the automatic interrogations results based on titles and abstracts, addition of new references based on study of references list from the previously selected papers, addition of references representing Romanian contributions and selection of papers based on preliminary study of their content. The main obtained results based on preliminary analysis of the selected references consist in presentation of the first published references, of the newest references and of the most cited references. It was highlighted that the trend of publication in anaerobic digestion of biomass with high lignocellulose content with the aim of hydrogen production, is in continuous increasing interest worldwide. © (2014) Trans Tech Publications, Switzerland. All Rights Reserved.

关键词： Lignocellulose

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Tuning a neural controller with distributed parameters

Tuning a neural controller with distributed parameters

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9th International Conference on Modeling and Optimization of the Aerospace, Robotics, Mechatronics, Machines-Tools, Mechanical Engineering and Human Motricity Fields, OPTIROB 2014

作者： Mureşan, Vlad Abrudean, Mihail VǍlean, Honoriu Ungureşan, Mihaela Ligia Coloşi, Tiberiu Technical University of Cluj-Napoca Automation Department 26-28 Bariţiu Street 400027 Cluj-Napoca Romania Technical University of Cluj-Napoca Physics and Chemistry Department 103-105 Muncii Street 400641 Cluj-Napoca Romania

ISBN: (纸本)9783038351115

In this paper, a solution for the control of a distributed parameter process, using a neural distributed parameter controller is presented. The main originality elements from the paper are the introducing of the distributed parameter controller concept, respectively the including of this type of controller in a control structure. In the paper, a method for tuning a distributed parameter controller is presented, taken as example the pH control system associated to a blunting process. Also, due to the complex structure of the controller two neural networks are used for its implementation. In order to highlight the main advantages of using of this type of controllers, some representative simulation results are presented. © (2014) Trans Tech Publications, Switzerland.

关键词： Controllers

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