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Dive into the research topics where Javier Freire is active.

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Featured researches published by Javier Freire.


Advances in Mechanical Engineering | 2016

An empirical methodology for prediction of shape and flow rate of a free-falling non-submerged liquid and casting iron stream:

P. J. Gamez-Montero; R. Castilla; Javier Freire; M. Khamashta; Esteve Codina

The work presented in this article demonstrates the use of an empirical and simplified approach based on an optical technique and a home-made ad hoc code that give knowledge of the shape and falling velocity of a free-falling non-submerged liquid stream to predict its typology and flow rate. The visualization photographic technique is a non-intrusive robust technique which can be applied to high-temperature liquids in harsh environments, such as an iron stream in a foundry. This technique allows predicting the liquid stream boundaries and contours without any type of treatment on the fluid. As a result of employing this empirical methodology, three flow typologies for a water stream are proposed and demonstrated experimentally. Comparisons with experimental data reveal satisfactory estimations of mean flow quantities. Finally, the approach used based on experimental visualization is carried out in an iron stream of a foundry, not being disruptive to in-situ foundry operations and showing its potential to improve performance of the cast parts’ properties during the casting phase and revealing to be a useful tool for process optimization.


Advances in Mechanical Engineering | 2015

Computational fluid dynamics and particle image velocimetry assisted design tools for a new generation of trochoidal gear pumps

M. Garcia-Vilchez; P. J. Gamez-Montero; Esteve Codina; R. Castilla; G. Raush; Javier Freire; C Río

Trochoidal gear pumps produce significant flow pulsations that result in pressure pulsations, which interact with the system where they are connected, shortening the life of both the pump and circuit components. The complicated aspects of the operation of a gerotor pump make computational fluid dynamics the proper tool for modelling and simulating its flow characteristics. A three-dimensional model with deforming mesh computational fluid dynamics is presented, including the effects of the manufacturing tolerance and the leakage inside the pump. A new boundary condition is created for the simulation of the solid contact in the interteeth radial clearance. The experimental study of the pump is carried out by means of time-resolved particle image velocimetry, and results are qualitatively evaluated, thanks to the numerical simulation results. Time-resolved particle image velocimetry is developed in order to adapt it to the gerotor pump, and it is proved to be a feasible alternative to obtain the instantaneous flow of the pump in a direct mode, which would allow the determination of geometries that minimize the non-desired flow pulsations. Thus, a new methodology involving computational fluid dynamics and time-resolved particle image velocimetry is presented, which allows the obtaining of the instantaneous flow of the pump in a direct mode without altering its behaviour significantly.


ASME 2003 International Mechanical Engineering Congress and Exposition | 2003

Hydraulic Driven Rotating Flexible Beam: Theoretical Modal Analysis and Proportional Servo Drive Parameter Influence

Javier Freire; Esteve Codina; M. Khamashta

Understanding the behavior of system with flexible elements is increasingly important in modern day technology. Reducing the mass of machine elements leads to a remarkable improvement in dynamic performance. However, a loss of precision also occurs with such an increase in flexibility. In order to arrive at a better understanding of systems with flexible elements, we are investigating the particular behavior of a hydraulic servo driven rotating flexible beam with the aim of obtaining a methodology that could be applied to a real application. To investigate this behavior, a set of models has been developed. In this paper, a theoretical model, using classical modal analysis methodology, is presented. The flexible beam is modeled in a standard way and the hydraulic servo drive is modeled as a boundary condition. Only normal modes will be investigated. This approach allows considering the servo proportional constant and the cylinder mass. It will be show that the servo proportional constant has low influence in the system eigen frequencies. The theoretical model predictions are validated experimentally.Copyright


International Journal of Mechanical Sciences | 2009

Misalignment effects on the load capacity of a hydraulic cylinder

P. J. Gamez-Montero; E. Salazar; R. Castilla; Javier Freire; M. Khamashta; E. Codina


Journal of Mechanical Design | 2012

Teeth Clearance and Relief Grooves Effects in a Trochoidal-Gear Pump Using New Modules of GeroLAB

P. J. Gamez-Montero; M. Garcia-Vilchez; G. Raush; Javier Freire; Esteve Codina


International Journal of Mechanical Sciences | 2009

Friction effects on the load capacity of a column and a hydraulic cylinder

P. J. Gamez-Montero; E. Salazar; R. Castilla; Javier Freire; M. Khamashta; E. Codina


Energies | 2017

GeroMAG: In-House Prototype of an Innovative Sealed, Compact and Non-Shaft-Driven Gerotor Pump with Magnetically-Driving Outer Rotor

P. J. Gamez-Montero; R. Castilla; Esteve Codina; Javier Freire; Joan Morató; Enric Sanchez-Casas; Ivan Flotats


Energies | 2017

Experimental Study of 3D Movement in Cushioning of Hydraulic Cylinder

Antonio Algar; Esteban Codina; Javier Freire


Energies | 2017

Magnet-Sleeve-Sealed Mini Trochoidal-Gear Pump Prototype with Polymer Composite Gear

P. J. Gamez-Montero; Piotr Antoniak; R. Castilla; Javier Freire; Justyna Krawczyk; Jarosław Stryczek; Esteve Codina


Energies | 2018

Bond Graph Simulation of Error Propagation in Position Estimation of a Hydraulic Cylinder Using Low Cost Accelerometers

Antonio Algar; Esteban Codina; Javier Freire

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Esteve Codina

Polytechnic University of Catalonia

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P. J. Gamez-Montero

Polytechnic University of Catalonia

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R. Castilla

Polytechnic University of Catalonia

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M. Khamashta

Polytechnic University of Catalonia

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E. Codina

Polytechnic University of Catalonia

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E. Salazar

Polytechnic University of Catalonia

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G. Raush

Polytechnic University of Catalonia

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M. Garcia-Vilchez

Polytechnic University of Catalonia

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C Río

Polytechnic University of Catalonia

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Jarosław Stryczek

Wrocław University of Technology

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