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Found 6278 publications

Robot cooperation by fuzzy signature sets rule base

Áron Ballagi László T. Kóczy

Publication Name: Sami 2010 8th International Symposium on Applied Machine Intelligence and Informatics Proceedings

Publication Date: 2010-04-30

Volume: Unknown

Issue: Unknown

Page Range: 37-42

Description:

This paper presents a novel method for control cooperating robots without any explicit communication line. We have proposed a fuzzy communication philosophy and implementation technique, where the codebooks are built up by signatures. Fuzzy signatures are used as complex state description method for intention guessing and action selection. Finally some real scenarios of autonomous mobile robot cooperation are presented. ©2010 IEEE.

Open Access: Yes

DOI: 10.1109/SAMI.2010.5423703

Extension of isothermal time-temperature parameters to non-isothermal conditions: Application to the simulation of rapid tempering

Janez Grum Gustavo Sanchez Sarmiento Augusto Moita De Deus Imre Felde Tamás Réti Rafael Colas

Publication Name: Strojniski Vestnik Journal of Mechanical Engineering

Publication Date: 2010-04-28

Volume: 56

Issue: 2

Page Range: 84-92

Description:

A phenomenological method for constructing non-isothermal, generalized time-temperature parameters (GTT parameters) is presented. An analysis of the relationship between the various traditional isothermal time-temperature parameters has verified that the generalized Dorn-parameter is regarded to be the sole non-isothermal complex parameter to which a rigorous, physically well-founded interpretation is attributed. Possible applications of GTT parameters are illustrated by examples concerning the prediction of hardness change in quenched steels during rapid tempering treatments. © 2010 Journal of Mechanical Engineering. All rights reserved.

Open Access: Yes

DOI: DOI not available

Evaluation Of hardening performance of cooling media by using inverse heat conduction methods and property prediction

No authors available

Publication Name: Strojniski Vestnik/Journal of Mechanical Engineering

Publication Date: 2010-04-28

Volume: 56

Issue: 2

Page Range: 77-83

Description:

A sequential numerical method for characterization of hardening performance of quenchants applied for steel quenching is outlined here. This novel method is based on the specific processing of measured time-temperature samples performed as a result of cooling curve tests. As a function of surface temperature the heat transfer coefficient, characterises the heat transfer during cooling and is calculated using an iterative inverse algorithm. The heat transfer coefficient is used for the calculation of the microstructural constituents and the hardness profile of cylindrical samples of arbitrary diameters. The hardening performance of the media is evaluated by the estimated hardness of the specimen obtained by heat treatment. © 2010 Journal of Mechanical Engineering. All rights reserved.

Open Access: No

DOI: DOI not available

Extension of isothermal time-temperature parameters to non-isothermal conditions: Application to the simulation of rapid tempering

No authors available

Publication Name: Strojniski Vestnik/Journal of Mechanical Engineering

Publication Date: 2010-04-28

Volume: 56

Issue: 2

Page Range: 84-92

Description:

A phenomenological method for constructing non-isothermal, generalized time-temperature parameters (GTT parameters) is presented. An analysis of the relationship between the various traditional isothermal time-temperature parameters has verified that the generalized Dorn-parameter is regarded to be the sole non-isothermal complex parameter to which a rigorous, physically well-founded interpretation is attributed. Possible applications of GTT parameters are illustrated by examples concerning the prediction of hardness change in quenched steels during rapid tempering treatments. © 2010 Journal of Mechanical Engineering. All rights reserved.

Open Access: No

DOI: DOI not available

Evaluation Of hardening performance of cooling media by using inverse heat conduction methods and property prediction

Imre Felde Tamás Réti

Publication Name: Strojniski Vestnik Journal of Mechanical Engineering

Publication Date: 2010-04-28

Volume: 56

Issue: 2

Page Range: 77-83

Description:

A sequential numerical method for characterization of hardening performance of quenchants applied for steel quenching is outlined here. This novel method is based on the specific processing of measured time-temperature samples performed as a result of cooling curve tests. As a function of surface temperature the heat transfer coefficient, characterises the heat transfer during cooling and is calculated using an iterative inverse algorithm. The heat transfer coefficient is used for the calculation of the microstructural constituents and the hardness profile of cylindrical samples of arbitrary diameters. The hardening performance of the media is evaluated by the estimated hardness of the specimen obtained by heat treatment. © 2010 Journal of Mechanical Engineering. All rights reserved.

Open Access: Yes

DOI: DOI not available

Improved energy management of capacitive energy storage in metro railcar by simulation

I. Szenasy

Publication Name: Renewable Energy and Power Quality Journal

Publication Date: 2010-04-01

Volume: 1

Issue: 8

Page Range: 757-762

Description:

This paper focuses on the use of modeling and simulation of a renewable energy. The capacitive energy storages contribute to the rapid energy recovery associated with regenerative braking in electric vehicles. This power system allows the acceleration and deceleration of the vehicle with a lower loss of energy. Short-distance passenger traffic on electrified lines is a domain where brake energy recuperation might reduce the total energy consumption significantly. In this paper the results of simulation models by Matlab-Simulink for an urban-metro railcar and some methods for reducing the needed value of capacitance by an improved energy management are presented. The aim of the new management of the energy storage system for decreasing the needed value of capacitance and improving the system performance is presented.

Open Access: Yes

DOI: 10.24084/repqj08.464

Experimental and numerical investigations of external reinforced damaged pipelines

Balázs Pere J. Lukács Gy Nagy János Égert I. Török

Publication Name: Procedia Engineering

Publication Date: 2010-04-01

Volume: 2

Issue: 1

Page Range: 1191-1200

Description:

The lifetime management of different engineering structures and structural elements is one of the important technical-economic problems nowadays. The purpose of the paper is to present the role of the external reinforcing on the structural integrity of industrial and transporting steel pipelines, based on experimental and numerical investigations. External reinforcement was developed using carbon fibre polymer matrix composite (PMC). Fatigue and burst tests were performed on pipeline sections containing natural and artificial metal loss defects, and girth welds including weld defects (passed and not passed quality). Both unreinforced and reinforced pipeline sections were examined. For the FEM investigation of the problem three groups of mechanical models are applied: multilayered elastic shell, 3D elastic solid and 3D elastic-plastic solid FEM models. The aim of this numerical analysis is to clarify the deformation, stresses and strains in the surrounding area of defects both in the steel pipe and in the composite reinforcement. A further task is to determine numerically the width of the reinforcement and the number of layers needed for reinforcement or repair. The applicability of the hybrid structure (steel + PMC) was demonstrated by means of the experimental and the numerical results. © 2010 Published by Elsevier Ltd.

Open Access: Yes

DOI: 10.1016/j.proeng.2010.03.129

Stability of the rubbing phenomenon with the gyroscopic effect

Peter Triesz

Publication Name: Pollack Periodica

Publication Date: 2010-04-01

Volume: 5

Issue: 1

Page Range: 65-72

Description:

The rubbing, as an undesired non-linear dynamical behavior of rotors, is a widely studied topic in the field of rotor-dynamics. Standard models usually use the classic Jeffcott rotor system with several rolling and journal (bearings without rolling elements, usually filled with oil) bearings, or with magnetic ones. The present paper investigates a model that takes into consideration also the gyroscopic effect and its influence on the rubbing phenomenon. © 2010 Akadémiai Kiadó.

Open Access: Yes

DOI: 10.1556/Pollack.5.2010.1.4

Using the Newton-Raphson method in the polarization technique to solve nonlinear static magnetic field problems

Miklós Kuczmann

Publication Name: IEEE Transactions on Magnetics

Publication Date: 2010-03-01

Volume: 46

Issue: 3 PART 2

Page Range: 875-879

Description:

The paper presents and compares three potential formulations to solve nonlinear static magnetic field problems by applying the fixed point technique and the Newton-Raphson scheme. Nonlinear characteristics are handled by the polarization method in both algorithms. The proposed combination of the Newton-Raphson scheme and the polarization formulation results in a very effective nonlinear solver, because only the derivate of the characteristics, i.e., only the permeability or the reluctivity has to be used. Therefore, this method can be used to solve nonlinear problems with hysteresis, and it is faster than the classical fixed point method. © 2010 IEEE.

Open Access: Yes

DOI: 10.1109/TMAG.2009.2034260