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1 to 34 of 34 results
  • A power flow analysis of a double-deck circular tunnel embedded in a full-space

     Clot Razquin, Arnau; Romeu Garbi, Jordi; Arcos Villamarin, Robert; Martin Román, Sara-regina
    Soil dynamics and earthquake engineering (1984)
    Date of publication: 2014-02
    Journal article

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    The purpose of the present investigation is to obtain the mean power flow radiated by a double-deck circular tunnel and compares it to the one radiated by a simple circular tunnel. To achieve this, a harmonic line load is applied on the interior floor of the first one and at the bottom of the second one. For the double-deck tunnel, a new analytical model based on the receptance method is developed. The proposed model describes the dynamics of the interior floor using the thin plate theory and considers the Pipe in Pipe (PiP) model to describe the tunnel and soil coupled system. Plain strain conditions are assumed for both systems and conservative coupling is considered between them. Numerical results show significant differences between the power flow radiated by both tunnels, with the one radiated by the double-deck tunnel reaching much higher values. The effect of modifying the flexural rigidity of the interior floor is also presented. © 2013 Elsevier Ltd.

    The purpose of the present investigation is to obtain the mean power flow radiated by a double-deck circular tunnel and compares it to the one radiated by a simple circular tunnel. To achieve this, a harmonic line load is applied on the interior floor of the first one and at the bottom of the second one. For the double-deck tunnel, a new analytical model based on the receptance method is developed. The proposed model describes the dynamics of the interior floor using the thin plate theory and considers the Pipe in Pipe (PiP) model to describe the tunnel and soil coupled system. Plain strain conditions are assumed for both systems and conservative coupling is considered between them. Numerical results show significant differences between the power flow radiated by both tunnels, with the one radiated by the double-deck tunnel reaching much higher values.

  • Fast computation of an infinite, longitudinally-varying and harmonic strip load acting on a viscoelastic half-space

     Arcos Villamarin, Robert; Clot Razquin, Arnau; Romeu Garbi, Jordi; Martin Román, Sara-regina
    European journal of mechanics. A, Solids
    Date of publication: 2014-02-01
    Journal article

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    In the context of the developing of a numerically efficient model of railway induced ground vibrations, the problem of an infinite, longitudinally-varying and harmonic strip load acting on the surface of a viscoelastic half-space is reformulated in order to improve its numerical evaluation. On one hand, the static integrands of this specific problem are modified and introduced into the original integrands to reduce their spectral content at high wavenumbers, saving computational time needed for the numerical integration. On the other hand, a change of variable is applied on the displacements integral solutions resulting on frequency independent integrands. These formulae allow to obtain the displacement solution in the complete x-y-ω field easier and, mostly, faster

  • Optimal acoustic error sensing for global active control in a harmonically excited enclosure

     Romeu Garbi, Jordi; Balastegui Manso, Andreu; Pamies Gomez, Teresa; Arcos Villamarin, Robert
    Acoustical physics
    Date of publication: 2014-01-01
    Journal article

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    The performance of an active control system in global control of enclosed sound fields depends largely on the localization of the error sensors, among other factors. In this paper a modified cost function is proposed in order to guarantee the maximum attenuation that can be produced by a set of secondary sources in the case of an harmonically excited sound field. The cost function is modified in order to drive the error signal to the value corresponding to the optimally attenuated sound field, instead of minimizing the squared pressure. To evaluate the performance of the proposed control system, its robustness against unstructured error is also investigated using a set of intensive calculations. Following this approach, the sensors can be located anywhere and the optimal attenuation is reached using an equal number of error sensors and secondary sources. The results also suggest that the greater the number of error sensors than secondary sources the more robust the control system is. This behavior holds for both the usual strategy of minimizing the squared pressure and the approach presented in this paper. However, the latter strategy is more robust than the traditional approach of minimizing the squared pressures and its robustness does not depend on the location of the error sensors. Thus, as a main conclusion, the use of the new cost function leads to a guaranteed efficiency and a more robust control system and gives absolute freedom in selecting the location of the error sensors.

  • Analytical simulations on active control of sound transmission through an aperture in a rectangular enclosure

     Pamies Gomez, Teresa; Romeu Garbi, Jordi; Arcos Villamarin, Robert; Martin Román, Sara-regina
    Acta acustica united with acustica
    Date of publication: 2014-03-01
    Journal article

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    This paper uses an analytical model of sound transmission through an aperture for the study of the performance of an active control of sound inside the enclosure to prevent the transmission of sound through an aperture placed in the enclosure wall, by comparing different active control strategies for the particular case of the low modal sound field. The results indicate that a global active control inside the enclosure is not enough to reduce the sound transmission through an aperture, but also that a practical approach consists of cancelling the pressure at the center of the plane of the aperture, thus ensuring satisfactory results.

    This paper uses an analytical model of sound transmission through an aperture for the study of the performance of an active control of sound inside the enclosure to prevent the transmission of sound through an aperture placed in the enclosure wall, by comparing different active control strategies for the particular case of the low modal sound field. The results indicate that a global active control inside the enclosure is not enough to reduce the sound transmission through an aperture, but also that a practical approach consists of cancelling the pressure at the center of the plane of the aperture, thus ensuring satisfactory results.

  • Active control of aircraft fly-over sound transmission through an open window

     Pamies Gomez, Teresa; Romeu Garbi, Jordi; Genesca Francitorra, Meritxell; Arcos Villamarin, Robert
    Applied acoustics
    Date of publication: 2014-10-01
    Journal article

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    This paper presents an experimental work on active control of sound transmission through a restricted opening bottom hinged window. The main goal of the work is to demonstrate the feasibility of the active technique to limit the loss of attenuation due to the aperture of windows, and its application to aircraft fly-over incident noise. The experimental window is placed in an exposed facade of a dwelling close to an airport and subject to fly-by aircraft noise. The active control is configured to cancel the pressure at the aperture using a single-input single-output feedforward adaptive system. As a result, a reduction of sound transmission is achieved with low power consumption. In global terms, an increase of almost 3 dB of transmission loss (with respect to the partially opened window insulation values) in the low frequency range (below 160 Hz and according to the National Danish Method for evaluating low frequency noise) is demonstrated, which is equivalent to a reduction of 50% in the loss of insulation caused by opening the window. (C) 2014 Elsevier Ltd. All rights reserved.

    This paper presents an experimental work on active control of sound transmission through a restricted opening bottom hinged window. The main goal of the work is to demonstrate the feasibility of the active technique to limit the loss of attenuation due to the aperture of windows, and its application to aircraft fly-over incident noise. The experimental window is placed in an exposed façade of a dwelling close to an airport and subject to fly-by aircraft noise. The active control is configured to cancel the pressure at the aperture using a single-input single-output feedforward adaptive system. As a result, a reduction of sound transmission is achieved with low power consumption. In global terms, an increase of almost 3 dB of transmission loss (with respect to the partially opened window insulation values) in the low frequency range (below 160 Hz and according to the National Danish Method for evaluating low frequency noise) is demonstrated, which is equivalent to a reduction of 50% in the loss of insulation caused by opening the window. © 2014 Elsevier Ltd. All rights reserved.

  • A dynamical model of a double-deck circular tunnel embedded in a full-space

     Clot Razquin, Arnau
    Defense's date: 2014-02-20
    Universitat Politècnica de Catalunya
    Theses

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    Aquesta tesis presenta un model dinàmic tridimensional d¿un túnel circular de dos pisos situat en el si d¿un espai infinit. El model fa ús del mètode de la receptància per a obtenir la resposta de l¿estructura completa a partir de la resposta de les seves parts. Els subsistemes considerats són, per una banda, el terra interior, i per l¿altra, el sistema acoblat túnel-terreny. El comportament dinàmic del primer es modelitza mitjançant la teoria clàssica de placa prima i el model Pipe-in-Pipe és l¿escollit per a descriure el segon. Com que el model proposat assumeix que el sistema és geomètricament invariant en la direcció de circulació dels trens, l¿acoblament dels subsistemes es pot realitzar en el domini nombre d¿ona-freqüència. Un cop el model ha estat formulat, es detallen els principals aspectes a tenir en compte en la seva computació numèrica i s¿interpreten els resultats obtinguts. La resposta d¿un túnel de dos pisos tant a una excitació dinàmica com a una de quasiestàtica es comparada a la resposta obtinguda en el cas d¿un túnel d'un únic pis. La primera comparativa es realitza mitjançant un estudi del flux de potència radiat per ambdues estructures sota l¿aplicació d¿una càrrega harmònica lineal. Les principals diferències entre les magnituds i els patrons de radiació són detallades i discutides. La segona comparativa es realitza calculant el flux total d¿energia que travessa una certa superfície del terreny quan una càrrega que es desplaça a velocitat constant es aplicada sobre ambdós túnels. La comparativa entre les respostes dels tunels es realitza per un ampli rang de velocitats. Finalment, es presenta un model complert de via-túnel-terreny obtingut a partir de l¿acoblament d¿un model de superestructura al model de túnel prèviament desenvolupat.

  • Measurement of aircraft noise in a high background noise environment using a microphone array

     Genesca Francitorra, Meritxell; Romeu Garbi, Jordi; Arcos Villamarin, Robert; Martin Román, Sara-regina
    Transportation research. Part D, transport and environment
    Date of publication: 2013-01
    Journal article

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  • Application of a fast pre-calculated model for vibration impact assessment from underground trains to Metro Line 9 of Barcelona

     Balastegui Manso, Andreu; Arcos Villamarin, Robert; Romeu Garbi, Jordi; Pamies Gomez, Teresa
    Noise control engineering journal
    Date of publication: 2013-03
    Journal article

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    The prediction of vibration levels near underground trains is of growing importance for newly constructed infrastructures in cities. Before construction, preliminary studies of vibration impact need to be undertaken in order to identify the buildings that may be affected based on vibration contamination laws and modify the railway line or the type of superstructure if necessary. These studies need fast and economic models due to the large areas they need to cover. The present study aims at predicting the vibration impact for the new Line 9 of Barcelona Underground which is 48 km long. The solution presented is a fast pre-calculated 2D FEM model which is run once for a set of different soil types and tunnel depths, obtaining sets of surface vibration levels. Interpolating between the depths and distances of the tabulated results can be used as a very fast model for prediction. The model is calibrated with measurements in the same conditions (rolling stock and superstructure) as those expected in Line 9 and offers an accuracy not far from current 2.5D and 3D models.

  • Some analytical aspects of viscoelastic Lamb¿s problem for improving its numerical evaluation

     Arcos Villamarin, Robert; Romeu Garbi, Jordi; Clot Razquin, Arnau; Genesca Francitorra, Meritxell
    Wave motion
    Date of publication: 2012-08-27
    Journal article

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    Two analytical modifications of the original viscoelastic time-harmonic Lamb’s problem expressions are presented with the aim of improving their numerical integration efficiency. Firstly, a new change of variable in the Lamb’s problem integrands is proposed, which allows a standardization of the integration sampling vector and a complete spatialfrequency field solution after performing only one numerical integration/transformation. Secondly, the Lamb’s problem static integrands are modified and introduced into the original integrands to reduce their spectral content at high wavenumbers and, therefore, the sampling vector lengths needed to avoid aliasing.

  • RECYTRACK Project: Elastomeric eco-friendly material based on end-of-life tires blended with organic bind resin for railway applications

     Carmona, Joan; Torres, Rafael; Polo, Montse; Arcos Villamarin, Robert
    International Congress and Exposition on Noise Control Engineering
    Presentation's date: 2012-08
    Presentation of work at congresses

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    RECYTRACK is a 3.5 year project granted by the European Union through LIFE+ 2010 program. The overall objective of the project is to demonstrate the environmental benefits and technical and economic feasibility of the implementation of an elastomeric eco-friendly material made of end-of-life tires with resin for railway applications. Within the consortium, AV Ingenieros jointly with LEAM, carries out the study of the vibration behavior of the eco-friendly material, which will be applied as a mat for ballasted tracks as well as an isolated block system for slab tracks. Firstly, an analytical model capable to characterize the eco-friendly material vibration behavior is under development. Subsequently, and after the implementation of the eco-friendly solutions in real railway infrastructures, its vibration behavior will be measured and validated through in situ measurements during the infrastructure commercial exploitation

    RECYTRACK is a 3.5 year project granted by the European Union through LIFE+ 2010 program. The overall objective of the project is to demonstrate the environmental benefits and technical and economic feasibility of the implementation of an elastomeric eco-friendly material made of end-of-life tires with resin for railway applications. Within the consortium, AV Ingenieros jointly with LEAM, carries out the study of the vibration behavior of the eco-friendly material, which will be applied as a mat for ballasted tracks as well as an isolated block system for slab tracks. Firstly, an analytical model capable to characterize the eco-friendly material vibration behavior is under development. Subsequently, and after the implementation of the eco-friendly solutions in real railway infrastructures, its vibration behavior will be measured and validated through in situ measurements during the infrastructure commercial exploitation.

  • CONTROL ACTIVO DE TRANSMISION DE RUIDO A TRAVES DE APERTURAS

     Pamies Gomez, Teresa; Balastegui Manso, Andreu; Arcos Villamarin, Robert; Romeu Garbi, Jordi
    Participation in a competitive project

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  • Elastomeric mats dynamic charaterization

     Arcos Villamarin, Robert
    Date: 2012-06
    Report

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  • Determination of the near field distance for point and line sources acting on the surface of an homogeneous and viscoelastic half-space

     Arcos Villamarin, Robert; Romeu Garbi, Jordi; Balastegui Manso, Andreu; Pamies Gomez, Teresa
    Soil dynamics and earthquake engineering (1984)
    Date of publication: 2011
    Journal article

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  • A model for railway induced ground vibrations in the frame of preliminary assessment studies  Open access

     Arcos Villamarin, Robert
    Defense's date: 2011-07-13
    Department of Mechanical Engineering, Universitat Politècnica de Catalunya
    Theses

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    This thesis focuses on the development of an analytical model for the generation and propagation parts of a global model of ground induced vibrations to be used in preliminary assessment studies for the case of at-grade railway infrastructures. The model is designed prioritising its speed, simplicity and usability ahead its accuracy modelling the real railway system. This model takes into account the subgrade as a viscoelastic and homogeneous half-space, the superstructure as a 2-layer supporting model and the vehicle as 1DOF system. With the aim of simplify the model, the superstructure/subgrade interaction is studied in terms of the wheel/rail contact dynamics, bounding in what cases this interaction can be neglected. The adaptation of this model when a far eld semi-analytical model is desired to be used as the propagation model is fully developed, by means of the dimensioning of the near eld and far eld regions.

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    A ground-borne vibration assessment model for rail systems at-grade  Open access

     Cardona, J.; Romeu Garbi, Jordi; Arcos Villamarin, Robert; Balastegui Manso, Andreu
    International Congress and Exposition on Noise Control Engineering
    Presentation's date: 2010-06-16
    Presentation of work at congresses

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    Due to the increasing number and kilometres of new railways lines, either high speed railway lines or commuter lines, as well as the increasing in human sensitivity versus ground-borne vibration generated for this mean of transport, a sustained growth in complaints due to the annoyance caused by railway vibrations has been detected. In order to predict the field vibrations caused by new railway lines in the project stage, which will be useful to design appropriate countermeasures, in the present work a ground-borne vibration model for rail systems at-grade developed by the authors is validated with experimental measurements in an existing commuter railway line. It checked that this model is a very useful tool to predict the vibration field that will be caused by a railway infrastructure in the planning stage of the project.

  • Pla de consolidació

     Balastegui Manso, Andreu; Arcos Villamarin, Robert; Martinez González, Eva; Jimenez Diaz, Santiago; Pamies Gomez, Teresa; Romeu Garbi, Jordi
    Participation in a competitive project

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  • Caracterización de las vibraciones provocadas por la circulación ferroviaria sobre un viaducto

     Cardona, Joan; Arcos Villamarin, Robert; Romeu Garbi, Jordi; Jimenez Diaz, Santiago; Balastegui Manso, Andreu
    Congreso Nacional de Acústica
    Presentation's date: 2009-09
    Presentation of work at congresses

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  • Cat dB Tren-Justificació Parcial-Tasca 2

     Arcos Villamarin, Robert; Balastegui Manso, Andreu
    Date: 2009-01
    Report

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  • Cat dB Tren-Justificació Parcial-Tasca 3

     Arcos Villamarin, Robert; Romeu Garbi, Jordi
    Date: 2009-01
    Report

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  • Cat dB Tren-Justificació Parcial-Tasca 1

     Arcos Villamarin, Robert
    Date: 2009-01
    Report

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  • PSD to acceleration

     Arcos Villamarin, Robert
    Date: 2009-06
    Report

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  • CATdBTren Project: new prediction tool of vibration impact for railway infrastructures

     Romeu Garbi, Jordi; Balastegui Manso, Andreu; Arcos Villamarin, Robert; Sanchez Venegas, Angel; Palacios Higueras, Jose Ignacio; Alarcon Rovira, Gabriel
    International Congress on Sound and Vibration
    Presentation's date: 2009-07-05
    Presentation of work at congresses

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    A model to calculate the vibration impact is presented. Due to the complexity of the phenomena, the model has been divided in different calculation stages, according to the different physical processes of generation, propagation and transmission to the building. The result is obtained after the compilation of different partial results which, however, are related with each other.

  • CATdBTren project: a complete model for the assessment of vibration impact from new railway infrastructures

     Alarcon Rovira, Gabriel; Palacios Higueras, Jose Ignacio; Romeu Garbi, Jordi; Balastegui Manso, Andreu; Arcos Villamarin, Robert; Sanchez Venegas, Angel
    European Conference on Noise Control
    Presentation's date: 2009-10-26
    Presentation of work at congresses

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    The prediction of vibration impact remains as a complex challenge for designers of new railway infrastructures. Due to the large quantity of parameters involved in the generation, transmission and reception of the vibration waves, it would be necessary to develop a complete study for each potential receiver, which would include: source, soil and building characterization, infrastructure vibration behaviour modelling and, finally, countermeasures influence prediction. This process can turn out to be very costly in terms of both time and money. Therefore, it is usually done only for areas very likely to suffer high vibration levels or for high sensitive buildings (hospital, educational). The CATdBTren project, which has been awarded with R&D funding from the Catalonia Government, is aimed to develop a new prediction tool for evaluating the vibration impact from new railway infrastructures as well as to develop new types of fastening systems having high vibration isolation properties. That tool is intended to be user-friendly and to produce results with average accuracy, so it still will be required detailed studies of problematic areas. In this sense, the software will model the contact forces caused by high-speed, conventional and underground rolling stock. Moreover, it will model the infrastructure’s vibration transmission behaviour, ground vibration propagation, terrain-foundation coupling and building vibration mechanism. The CATdBTren prediction tool will be also capable of estimating the influence of the rolling stock, rail and wheel roughness, fastening system, substructure, soil vibration propagation properties and building characteristics, all in the final vibration impact.

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    Development of frequency-domain source models for railway vibration impact assessment  Open access

     Palacios Higueras, Jose Ignacio; Arcos Villamarin, Robert; Prat Requena, Mercè; Balastegui Manso, Andreu
    European Conference on Noise Control
    Presentation's date: 2009-10-26
    Presentation of work at congresses

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    Many studies have been focused on the development of vibration source models, which comprise both the force applied on the track top and the vibration behaviour of the fixation system. Numerous researchers model the interaction between wheel and rail as a constant load moving along the track. Other authors consider a combination of harmonic and non-harmonic moving axle loads. Whereas most of these models are intended to validate time-domain vibration results, they become useless for predicting the frequency-domain vibration impact far from the track, data which is required in order to asses the fulfilment implied by most of the national regulations. In this work, two source models are presented and described. The first model comprises a series of empirical-statistical models, based on vibration measurements carried out in rail tracks. These models allow predicting the mean frequency-dependent applied force by high-speed, conventional and underground rolling stock. The second model consists in an analyticdeterministic approach based on the theoretical model of the wheel-rail deformation. This deformation is used to obtain the wheel-rail contact force trough the Hertz’s Theory of mechanical contacts. The model includes the superstructure motion, considering the rail as a Bernoulli-Euler beam, the sleepers as a punctual mass, and the pad, ballast and ground impedances. These source models will be included in the prediction tool for evaluating the vibration impact for new railway infrastructures, which is being developed within the CATdBTren project. This project has been awarded a R&D funding from the Catalonian Governmen.

  • Bases de un modelo semianalítico de predicción de la propagación de vibraciones causadas por ferrocarril

     Cardona Gonyalons, Joan; Romeu Garbi, Jordi; Sanchez Venegas, Angel; Arcos Villamarin, Robert; Berrioategortua, I A
    Acústica 2008. V Congreso Ibérico de Acústica. XXXIX Congreso Español de Acústica TECNIACÚSTICA 2008
    Presentation of work at congresses

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  • Surface vibration pattern induced by underground trains

     Balastegui Manso, Andreu; Arcos Villamarin, Robert; Palacios Higueras, Jose Ignacio; Cardona Gonyalons, Joan
    International Congress and Exposition on Noise Control Engineering
    Presentation of work at congresses

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  • Bases de un modelo semianalítico de predicción de la propagación de vibraciones causadas por ferrocarril

     Cardona Gonyalons, Joan; Romeu Garbi, Jordi; Sanchez Venegas, Angel; Arcos Villamarin, Robert; Berrioategortua, I A
    Acústica 2008. V Congreso Ibérico de Acústica. XXXIX Congreso Español de Acústica TECNIACÚSTICA 2008
    Presentation of work at congresses

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  • Surface vibration pattern induced by underground trains

     Balastegui Manso, Andreu; Arcos Villamarin, Robert; Palacios Higueras, Jose Ignacio; Cardona Gonyalons, Joan
    International Congress and Exposition on Noise Control Engineering
    Presentation of work at congresses

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