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Bucharest, romenia

Crudu M.,University of Poitiers | Fatu A.,University of Poitiers | Hajjam M.,University of Poitiers | Cristescu C.,Inoe Ihp
Sealing Technology

In this article a numerical model, developed previously by the authors to study the sealing performance of hydraulic reciprocating seals, is extended in order to include the effect of seal roughness. The model is verified on a typical elastomeric "U-type" rod seal under steady-state conditions. The influence of the roughness geometrical distribution and wavelength on seal performance is analysed, and it is shown that seal roughness significantly influences the results compared with numerical predictions. © 2013 Elsevier Ltd. Source

The rotary volumetric pumps with radial pistons used in hydraulics have been very little studied in Romania and when the issue was approached it was only theoretically. The paper presents the results of the experimental studies performed by the author on a positioning servo mechanism used for regulating the geometrical volume of the pumps with radial pistons. For developing the research, the author has designed both and realized the experimental model of the mechatronic positioning system and the test stand. Source

Almeida C.,Durham University | Almeida C.,Chinese Academy of Sciences | Baugh C.M.,Durham University | Lacey C.G.,Durham University | And 5 more authors.
Monthly Notices of the Royal Astronomical Society

We introduce a new technique based on artificial neural networks which enable us to make accurate predictions for the spectral energy distributions (SEDs) of large samples of galaxies, at wavelengths ranging from the far-ultraviolet (UV) to the submillimetre (sub-mm) and radio. The neural net is trained to reproduce the SEDs predicted by a hybrid code comprised of the galform semi-analytical model of galaxy formation, which predicts the full star formation and galaxy merger histories, and the grasil spectro-photometric code, which carries out a self-consistent calculation of the SED, including absorption and emission of radiation by dust. Using a small number of galaxy properties predicted by galform, the method reproduces the luminosities of galaxies in the majority of cases to within 10 per cent of those computed directly using grasil. The method performs best in the sub-mm and reasonably well in the mid-infrared (IR) and far-UV. The luminosity error introduced by the method has negligible impact on predicted statistical distributions, such as luminosity functions or colour distributions of galaxies. We use the neural net to predict the overlap between galaxies selected in the rest-frame UV and in the observer-frame sub-mm at z = 2. We find that around half of the galaxies with a 850 μm flux above 5 mJy should have optical magnitudes brighter than RAB < 25 mag. However, only 1 per cent of the galaxies selected in the rest-frame UV down to RAB < 25 mag should have 850 μm fluxes brighter than 5 mJy. Our technique will allow the generation of wide-angle mock catalogues of galaxies selected at rest-frame UV or mid- and far-IR wavelengths. © 2009 The Authors. Journal compilation © 2009 RAS. Source

Popescu T.C.,Inoe Ihp | Blejan M.,Inoe Ihp
Romanian Review Precision Mechanics, Optics and Mechatronics

The authors present an experimental stand dedicated to research laboratories for testing scale models of axial hydraulic turbine, and also the testing procedure suitable for this stand. The stand is one of the recent professional achievements of the two authors, being commissioned in 2015 at ICPE-CA Bucharest. It is characterized by high technical performance and reduced overall sizes. The aim of this material is to attract the attention of potential beneficiaries, educational and research units, who might be interested in procurement or development of such high performance stands. © 2015, Editura Cefin. All rights reserved. Source

Biolan I.,INCDIF ISPIF | Sovaiala G.,Inoe Ihp | Visan A.,Inoe Ihp
Advanced Materials Research

This research was conducted during 1984-2009, on an irrigation reel hose machine - IATF-300 type. The paper presents the mathematical model that has been used to optimize hydraulic engine performance, its attempts where made taking in consideration the engine recommendations to test it to a load charge. © (2012) Trans Tech Publications. Source

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