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Found 6273 publications

Analysis of railway vehicles' bogies with different wheel forces

No authors available

Publication Name: Proceedings of the Mini Conference on Vehicle System Dynamics, Identification and Anomalies

Publication Date: 1996-12-01

Volume:

Issue:

Page Range: 203-213

Description:

For the past ten years, geometry and loaded tests on railway bogies are in progress at the Department for Automotive and Railway Engineering of Szechenyi Istvan College. Following analysis of running and driven bogies and laboratory measurements, operating test of running vehicles has also been conducted. Initial results made it possible to perform different theoretical and computer analysis.

Open Access: No

DOI: DOI not available

Residual elimination algorithm for solving linear equations and application for sparse systems

No authors available

Publication Name: ZAMM Zeitschrift fur Angewandte Mathematik und Mechanik

Publication Date: 1996-12-01

Volume: 76

Issue: SUPPL. 1

Page Range: 485-486

Description:

A new direct algorithm for solving linear system of equations will be presented. Short theoretical background and analysis of the proposed method will be given. We formulate an optimized version of the proposed algorithm, which also works for sparse matrices. The complexity of the suggested algorithm for full matrix systems is n3/3 H- O(n2) where n is the dimension of the problem. The numerical experiments show that some versions of the residual elimination algorithm can be competitive with the Gaussian elimination both in complexity and precision. Moreover the sparse linear solver based on this algorithm has some advantages in parallel environment.

Open Access: No

DOI: DOI not available

Environmental management model: an analysis on the relations of the components of environmental management

No authors available

Publication Name: Proceedings of the 1st International Conference on Environmental Engineering Education and Training, EEET'96

Publication Date: 1996-01-01

Volume:

Issue:

Page Range: 151-159

Description:

The theme of the essay: The presentation of an environmental analysis model Aim and utility: environmental condition varieties as well as effects on people; economic and social activities behind the effects and their influence on changing environmental policy regulations; establish a conceptual organization which can support the analysis of interactions.

Open Access: No

DOI: DOI not available

Experimental determination of plastic zones

E. Czoboly I. Havas B. Csizmazia

Publication Name: Materials Science

Publication Date: 1996-01-01

Volume: 32

Issue: 1

Page Range: 87-98

Description:

We present four experimental series for the determination of the size and shape of plastic zones due to monotonic and cyclic loadings. Specimens contain notches of various geometries but not cracks. This provides the possibility to study the effect of notch radius and the repetitions of loading without the disturbing influence of crack closure and the previous loading history. Different steels and aluminum alloys are involved. It is shown that the size of the zone increases significantly as a function of load cycles. © 1997 Plenum Publishing Corporation.

Open Access: Yes

DOI: 10.1007/BF02538929

Environmental management model: an analysis on the relations of the components of environmental management

M. Bulla

Publication Name: Proceedings of the 1st International Conference on Environmental Engineering Education and Training Eeet 96

Publication Date: 1996-01-01

Volume: Unknown

Issue: Unknown

Page Range: 151-159

Description:

The theme of the essay: The presentation of an environmental analysis model Aim and utility: environmental condition varieties as well as effects on people; economic and social activities behind the effects and their influence on changing environmental policy regulations; establish a conceptual organization which can support the analysis of interactions.

Open Access: Yes

DOI: DOI not available

A block-circulant preconditioner for domain decomposition algorithm for the solution of the elliptic problems by second order finite elements

Béla Kiss G. Y. Molnarka

Publication Name: Computing Systems in Engineering

Publication Date: 1995-01-01

Volume: 6

Issue: 4-5

Page Range: 369-376

Description:

A preconditioned conjugate gradient domain decomposition method was given Refs 1 and 2 for the solution of a system of linear equations arising in the finite element method applied to the elliptic Dirichlet, Neumann and mixed boundary value problems. We have proved that the construction can be generalized2 for higher order finite element method. Here we give a construction and theoretical investigation of preconditioners for second order finite elements. A method and the the results of calculation is given. The presented numerical experiments show that this preconditioner works well. © 1995.

Open Access: Yes

DOI: 10.1016/0956-0521(95)00039-9

A circulant preconditioner for domain decomposition algorithm for the solution of the elliptic problems

N. A.A. Rahman Béla Kiss G. Y. Molnarka

Publication Name: Periodica Mathematica Hungarica

Publication Date: 1994-08-01

Volume: 29

Issue: 1

Page Range: 67-80

Description:

A preconditioned conjugate gradient (PCG)-based domain decomposition method was given in [11] and [12] for the solution of linear equations arising in the finite element method applied to the elliptic Neumann problem. The novelty of the proposed algorithm was that the recommended preconditioner was constructed by using symmetric-cyclic matrix. But we could give only the definitions of the entries of this cyclic matrix. Here we give a short description of this algorithm, the method of calculation of matrix entries and the results of calculation. The numerical experiments presented show, that this construction of precondition in the practice works well. © 1994 Akadémiai Kiadó.

Open Access: Yes

DOI: 10.1007/BF01876204

On the K0 factor

No authors available

Publication Name: Periodica Polytechnica Civil Engineering

Publication Date: 1994-01-01

Volume: 38

Issue: 1

Page Range: 127-135

Description:

After presenting the significance of the K0 factor the paper discusses some aspects of the formulae for the coefficient of earth pressure at rest, mainly the well-known Jaky's equation. An improvement for the critical Jaky's assumption is introduced and a modified K0 ...φ relationship is deduced. All the formulae originating from Jaky's idea and some other continuum mechanical or speculative equations are tested against 153 measured data. The original Jaky's equation, and the ones from Vierbiczky and Matsuoka-Sakakibara were found to be the best. -from Author

Open Access: No

DOI: DOI not available

On the K0 factor

Róbert Szepesházi

Publication Name: Periodica Polytechnica Civil Engineering

Publication Date: 1994-01-01

Volume: 38

Issue: 1

Page Range: 127-135

Description:

After presenting the significance of the K0 factor the paper discusses some aspects of the formulae for the coefficient of earth pressure at rest, mainly the well-known Jaky's equation. An improvement for the critical Jaky's assumption is introduced and a modified K0 ...φ relationship is deduced. All the formulae originating from Jaky's idea and some other continuum mechanical or speculative equations are tested against 153 measured data. The original Jaky's equation, and the ones from Vierbiczky and Matsuoka-Sakakibara were found to be the best. -from Author

Open Access: Yes

DOI: DOI not available