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Jazarevic V.,University Polytecnica Of Catalonia | Rasuo B.,University of Belgrade
FME Transactions | Year: 2013

The sound which is generated from the aircraft during the take-offand landing is one of the main problems for the people who live in the areas near the airport. It is very important to allocate and accurately calculate acoustic sources generated from turbulent flow produced by the aerodynamics components of the aircraft. This is done in order to calculate inhomogeneous term of Helmholtz equation which serves as a prediction tool of sound propagation in the domain. It is used subgrid-scale stabilized (SGS) finite element method for solving incompressible Navier-Stokes equation which simulate turbulent flow. Afterwards is done double divergence of Litghill's tensor in order to calculate acoustics sources. Further, the transformation from time domain to frequency domain is used with Direct Fourier Transform which leads to smaller memory usage and computational cost. The aim of the article is to show that previously mention method lead to better and richer representation of the spectrum of frequencies obtained from turbulent flow. Good representation of spectrum will give better inhomogeneous term of Helmholtz equation. Better prediction and calculation of acoustics sources will lead to reduction of sound generation through design of aerodynamics components on the aircraft. © Faculty of Mechanical Engineering, Belgrade.


Zondervan E.,TU Eindhoven | Bojarski A.D.,University Polytecnica Of Catalonia | Espuna A.,University Polytecnica Of Catalonia | de Haan A.B.,TU Eindhoven | Puigjaner L.,University Polytecnica Of Catalonia
Computer Aided Chemical Engineering | Year: 2012

In this contribution we propose a framework that can be used as a tool for sustainable process design in which the combined assessment of economic and environmental impact is performed. The framework combines three phases in the design procedure i) goal definition and model building, ii) sensitivity analysis and iii) interpretation of the collected data using pareto analysis and rank- and proximity criteria. The proposed methodology is implemented as a scenario-based optimization tool that can be used to study integer and continuous process variables. © 2012 Elsevier B.V.


Chatzi S.,Athens Information Technology | Chatzi S.,University Polytecnica Of Catalonia | Lazaro J.A.,University Polytecnica Of Catalonia | Prat J.,University Polytecnica Of Catalonia | Tomkos I.,Athens Information Technology
European Conference on Optical Communication, ECOC | Year: 2010

A techno-economic comparison for the outside plant (OSP) and the active equipment of three access-metro networks, a) EP2P, b) GPON and c) a hybrid WDM/TDM based converged access-metro solution, shows the actual expected cost benefit of the third solution. ©2010 IEEE.

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