Research, Technologies, Innovation and Employment

21 Oct Dynamic modal analysis of road viaducts lean on the elastomeric anti-seismic devices / Analiza modală a viaductelor rutiere rezemate pe dispozitive antiseismice elastomerice

Romanian Academy of Technical Sciences (ASTR)
2013

This paper presents synthesis results of applied researches on the behaviour of modal road viaducts which are elastic leaning and have only mostly only rigid motions with elastic. Eigen mode analysis was performed for a road viaduct performed by Bechtel in Gilau area on Transilvania Highway.

21 Oct Effects cumulation by fatigue loading with more blocks of stresses / Cumularea efectelor la solicitarea la oboseală cu mai multe blocuri de tensiuni

Romanian Academy of Technical Sciences (ASTR)
2013

The paper deals with effects cumulation in the case of a mechanical structure cyclic loaded with blocks of different stresses. The most known relationships proposed in literature for this loading case, are empirical, refers to linear-elastic behavior of the material; they do not take into account the influence of mean stress, of load rate and deteriorations. In this paper one proposes a general relationship for the effects accumulation, due to cyclic loading with several blocks of normal stresses, in the case of nonlinear behavior of the structure material.

21 Oct Combined experimental researches on the stress state in the bearing structure of a special wagon / Cercetări experimentale combinate privind starea de tensiune din structura de rezistenţă a unui vagon de construcţie specială

Romanian Academy of Technical Sciences (ASTR)
2013

The authors conducted experimental research on the buggy ladle and beams chesonate models manufactured at scale. The actual structure of the bogie was tested on a special stand set up in the laboratory of Strength of Materials Department of the "Politehnica" University of Bucharest.

21 Oct Defining the reliability level of the car braking system based on the measured diagnosis parameters

Romanian Academy of Technical Sciences (ASTR)
2013

The paper proposes to assess the level of reliability of the devices taking into account the evaluation coefficient 〖K_ij〗^β and the importance coefficient 〖K_j〗^α, related to the parameters measured by diagnosis.

21 Oct Considerations over ecodesigning and its relations with Innovative Engineering / Unele consideraţii privind ecoproiectarea şi relaţionarea ei cu Ingineria Inovativă

Romanian Academy of Technical Sciences (ASTR)
2013

There are underlined some forms of engineering design process in correlation with scientific research and technology. The main European directives and regulations in ecodesign are analyzed.

21 Oct The influence of sheet metal cutting technology on the energy losses in NO silicon iron alloys / Efectul tehnologiilor de debitare a tolelor electrotehnice asupra pierderilor de energie în maşinile electrice

Romanian Academy of Technical Sciences (ASTR)
2013

The increasing of the a.c. motors efficiency is a stringent necessity in Europe, with important effects on the final users' expenditures and on the decreasing of the emissions associated by the burning of the primary fuel to produce electrical energy. The increasing of the a.c. motors efficiency may be obtained mainly by decreasing the energy losses in magnetic cores.

21 Oct Intentional electromagnetic interferences – a potential risk for the operation of electric and electronic technical systems / Interferenţele electromagnetice intenţionate – un risc potenţial pentru funcţionarea sistemelor tehnice electrice şi elec

Romanian Academy of Technical Sciences (ASTR)
2013

Intentional electromagnetic interferences (IEMIs), as "malicious generation of electromagnetic energy introducing noise or signals into electric and electronic systems, thus disrupting, confusing or damaging these systems for terrorist or criminal purposes" (acc. to IEC International standard 61000-2-13) represent a potential risk factor, which should be taken into account when assessing the safe operation of complex, significant current systems and especially of the future systems, associated with a sustainable development of society.

21 Oct Ecological technology for deep improvement of foundation soil / Tehnologie ecologica privind consolidarea de adancime a terenului de fundare

Romanian Academy of Technical Sciences (ASTR)
2013

For many projects the improvement of the soil is required over a great thickness, considering the increase of the bearing capacity of the foundation soil in order to support the construction loads, to eliminate the collapse potential of the loess deposits and to limit general and differential settlement etc. To achieve these requirements, it is necessary to improve the soil with a grid of concrete vertical displacement inclusions.

21 Oct Dynamic compaction – ground improvement solution for sustainable projects in Romania / Compactare dinamică – soluţie de îmbunătăţire a terenului pentru proiecte sustenabile în România

Romanian Academy of Technical Sciences (ASTR)
2013

The environmental benefits from DC (Dynamic Compaction) are significant - the ground is consolidated in situ so there is no need for transportation and deposit of soil spoils or waste. This paper presents the main theoretical aspects of the method, and explains based on recent experiences in Romania how it can be used for sustainable construction projects.

21 Oct Waves and gravity – mathematical formulations that allow reinterpretations and openings in technology

Romanian Academy of Technical Sciences (ASTR)
2013

The purpose of this paper is twofold: (i) a description of standing waves, (ii) revealing the informational origin of gravity. Waves are achieved by imposing a special form of solutions of the system of partial differential equations (PDE) describing electromagnetic waves.