The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform

Wim Desmet - One of the best experts on this subject based on the ideXlab platform.

  • Implications of Nonsub-Wavelength Resonator Spacing on the Sound Transmission Loss Predictions of Locally Resonant Metamaterial Partitions
    Journal of Vibration and Acoustics, 2020
    Co-Authors: L Van Belle, Claus Claeys, Elke Deckers, Wim Desmet
    Abstract:

    Abstract Locally resonant metamaterials have recently emerged and gained attention in the field of noise control engineering. The addition of resonant structures to a flexible partition on a sub-wavelength scale enables a targeted frequency range of strongly reduced vibration and Sound Transmission. These structures have been widely studied and are typically analyzed using infinite periodic structure theory. The implications of nonsub-wavelength resonator spacing on the Sound Transmission Loss of metamaterial partitions as well as on the representativeness of the infinite periodic structure modeling are, however, less well known. In this technical brief, it is shown that, although a shifted Sound Transmission Loss peak can be predicted for partitions with nonsub-wavelength resonator spacing when using infinite periodic structure modeling, the Sound Transmission Loss enhancement is not guaranteed for their finite structure counterparts.

  • metamaterial foam core sandwich panel designed to attenuate the mass spring mass resonance Sound Transmission Loss dip
    Mechanical Systems and Signal Processing, 2020
    Co-Authors: N G R De Melo Filho, Claus Claeys, Elke Deckers, Wim Desmet
    Abstract:

    Abstract Double panel partitions with a foam core suffer a poor Sound Transmission Loss at their mass-spring-mass resonance frequency. This paper considers the use of vibro-acoustic resonant metamaterials to improve the acoustic insulation performance at the frequency region of this resonance while adding only 8% of mass to the double panel, hence maintaining its lightweight characteristics. To design the metamaterial, dispersion curves are calculated through finite element unit cell analysis to predict the stop band frequency region. The resulting Sound Transmission Loss due to the stop band effect is predicted using Heckl’s model combined with the equivalent dynamic mass of the metamaterial, which is obtained from the dispersion curves analysis. This method allows taking into consideration complex resonator geometries and locally reacting material interlayers in the hosting panel. The designed metamaterial double panel is realised, and its experimentally measured insertion Loss surpasses the insertion Loss of the bare and equivalent mass addition double panels in the targeted frequency region. The predicted insulation agrees well with the measured performance, validating the proposed method.

  • the impact of damping on the Sound Transmission Loss of locally resonant metamaterial plates
    Journal of Sound and Vibration, 2019
    Co-Authors: L Van Belle, Claus Claeys, Elke Deckers, Wim Desmet
    Abstract:

    Abstract Vibro-acoustic locally resonant metamaterials with structural stop band behaviour can lead to a strongly increased Sound Transmission Loss in a targeted frequency range. This work assesses the impact of damping in the constituents of metamaterial plates on their acoustic insulation performance by means of infinite periodic and finite structure modelling. Besides applying the hybrid Wave Based - Finite Element unit cell method for infinite plates and the Finite Element Method for finite plates, qualitative dispersion curve based predictions are extended to quantitative Sound Transmission Loss approximations by introducing a dispersion curve based equivalent plate method. Both an idealised and a realisable locally resonant metamaterial plate are analysed. Damping in the resonators in particular is found to have an important impact in and around the stop band, reducing the Sound Transmission Loss peak, but improving the subsequent dip and reducing resonant Transmission in a broadening frequency range around the stop band. The damping influenced Sound Transmission Loss predictions for the realisable locally resonant metamaterial plate are experimentally validated by means of insertion Loss measurements. It is shown that, by including damping in the infinite periodic structure modelling, acoustic insulation performance predictions with improved accuracy are obtained.

  • Sound Transmission Loss of locally resonant metamaterial and phononic crystal plates
    2018 12th International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials), 2018
    Co-Authors: L Van Belle, Claus Claeys, Elke Deckers, Wim Desmet
    Abstract:

    This paper investigates the Sound Transmission Loss of locally resonant metamaterial and phononic crystal plates using unit cell and finite plate analysis. Plates with flexural wave stop bands can lead to enhanced vibro-acoustic performance. The acoustic insulation performance and frequency range depends, however, on the underlying stop band mechanism. While unit cell analysis suggests Sound Transmission Loss improvements regardless of the mechanism, the vibro-acoustic performance of their finite plate counterparts can differ significantly.

  • Sound Transmission Loss of a locally resonant metamaterial using the hybrid wave based finite element unit cell method
    2017 11th International Congress on Engineered Materials Platforms for Novel Wave Phenomena (Metamaterials), 2017
    Co-Authors: L Van Belle, Claus Claeys, Elke Deckers, Wim Desmet
    Abstract:

    This paper discusses the Sound Transmission Loss of a locally resonant metamaterial, by application of the hybrid Wave Based — Finite Element unit cell method. Since damping has an important influence on the vibro-acoustic attenuation performance of these metamaterials, the impact of damping in resonator and host structure on the Sound Transmission Loss is examined.

Zefeng Wen - One of the best experts on this subject based on the ideXlab platform.

  • Sound Transmission Loss properties of truss core extruded panels
    Applied Acoustics, 2018
    Co-Authors: Yumei Zhang, David Thompson, Giacomo Squicciarini, Jungsoo Ryue, Xinbiao Xiao, Zefeng Wen
    Abstract:

    Abstract The car body structures of modern trains are often formed of extruded aluminium panels. Their acoustic properties, particularly the Sound Transmission Loss, have an important influence on the interior acoustic environment. In order to study the acoustic performance of extruded panels, their Sound Transmission Loss (STL) is studied using the coupled Wavenumber Finite Element method (WFE) and Wavenumber Boundary Element method (WBE). The damping of a typical structure is first measured in the laboratory to give suitable input values for the model. The predicted STL is compared with corresponding measurements of the sample panel, with good agreement above 400 Hz. Based on the validated model, an extensive parametric study is carried out to investigate the effect of different reinforcement rib styles on the STL. The effect of using extruded panels with rectangular, triangular and trapezoidal truss-core sections is studied in detail. Among the parameters studied, the number of bays in a given width has a great influence on the Sound insulation. Considering practical use, both the mass and stiffness of each case are also considered. To give increased understanding of the STL behaviour, the dispersion curves are also studied. It is found that structures with better STL usually have fewer free wavenumbers below the acoustic wavenumber. For the same number of structural bays, a panel with triangular stiffening has the highest strength but also the largest mass, whereas a structure with rectangular stiffening has the least strength and lowest mass. In the evaluation, the weighted STL Rw and the spectral adaptation term Ctr are considered. The results are also considered relative to a mass law adjustment of the STL. It is found that the three cases which give the best results are a triangular rib panel with 4 or 5 bays in a 1 m width, and a trapezium case with 5 bays and inclination angle 25°. These have an Rw that is 2–6 dB better than the reference panel, a smaller mass and a higher stiffness.

  • Dataset for paper "Sound Transmission Loss Properties of Truss Core Extruded Panels"
    2017
    Co-Authors: Yumei Zhang, David Thompson, Giacomo Squicciarini, Jungsoo Ryue, Xinbiao Xiao, Zefeng Wen
    Abstract:

    Dataset supports: Zhang, Y., Thompson, D., Squicciarini, G., Ryue, J., Xiao, X., & Wen, Z. (2017). Sound Transmission Loss Properties of Truss Core Extruded Panels. Applied Acoustics.

  • Sound Transmission Loss of windows on high speed trains
    Journal of Physics: Conference Series, 2016
    Co-Authors: Yumei Zhang, David Thompson, Giacomo Squicciarini, Xinbiao Xiao, Zefeng Wen
    Abstract:

    The window is one of the main components of the high speed train car body structure through which noise can be transmitted. To study the windows’ acoustic properties, the vibration of one window of a high speed train has been measured for a running speed of 250 km/h. The corresponding interior noise and the noise in the wheel-rail area have been measured simultaneously. The experimental results show that the window vibration velocity has a similar spectral shape to the interior noise. Interior noise source identification further indicates that the window makes a contribution to the interior noise. Improvement of the window’s Sound Transmission Loss (STL) can reduce the interior noise from this Transmission path. An STL model of the window is built based on wave propagation and modal superposition methods. From the theoretical results, the window’s STL property is studied and several factors affecting it are investigated, which provide indications for future low noise design of high speed train windows.

Yumei Zhang - One of the best experts on this subject based on the ideXlab platform.

  • Sound Transmission Loss properties of truss core extruded panels
    Applied Acoustics, 2018
    Co-Authors: Yumei Zhang, David Thompson, Giacomo Squicciarini, Jungsoo Ryue, Xinbiao Xiao, Zefeng Wen
    Abstract:

    Abstract The car body structures of modern trains are often formed of extruded aluminium panels. Their acoustic properties, particularly the Sound Transmission Loss, have an important influence on the interior acoustic environment. In order to study the acoustic performance of extruded panels, their Sound Transmission Loss (STL) is studied using the coupled Wavenumber Finite Element method (WFE) and Wavenumber Boundary Element method (WBE). The damping of a typical structure is first measured in the laboratory to give suitable input values for the model. The predicted STL is compared with corresponding measurements of the sample panel, with good agreement above 400 Hz. Based on the validated model, an extensive parametric study is carried out to investigate the effect of different reinforcement rib styles on the STL. The effect of using extruded panels with rectangular, triangular and trapezoidal truss-core sections is studied in detail. Among the parameters studied, the number of bays in a given width has a great influence on the Sound insulation. Considering practical use, both the mass and stiffness of each case are also considered. To give increased understanding of the STL behaviour, the dispersion curves are also studied. It is found that structures with better STL usually have fewer free wavenumbers below the acoustic wavenumber. For the same number of structural bays, a panel with triangular stiffening has the highest strength but also the largest mass, whereas a structure with rectangular stiffening has the least strength and lowest mass. In the evaluation, the weighted STL Rw and the spectral adaptation term Ctr are considered. The results are also considered relative to a mass law adjustment of the STL. It is found that the three cases which give the best results are a triangular rib panel with 4 or 5 bays in a 1 m width, and a trapezium case with 5 bays and inclination angle 25°. These have an Rw that is 2–6 dB better than the reference panel, a smaller mass and a higher stiffness.

  • Dataset for paper "Sound Transmission Loss Properties of Truss Core Extruded Panels"
    2017
    Co-Authors: Yumei Zhang, David Thompson, Giacomo Squicciarini, Jungsoo Ryue, Xinbiao Xiao, Zefeng Wen
    Abstract:

    Dataset supports: Zhang, Y., Thompson, D., Squicciarini, G., Ryue, J., Xiao, X., & Wen, Z. (2017). Sound Transmission Loss Properties of Truss Core Extruded Panels. Applied Acoustics.

  • Sound Transmission Loss of windows on high speed trains
    Journal of Physics: Conference Series, 2016
    Co-Authors: Yumei Zhang, David Thompson, Giacomo Squicciarini, Xinbiao Xiao, Zefeng Wen
    Abstract:

    The window is one of the main components of the high speed train car body structure through which noise can be transmitted. To study the windows’ acoustic properties, the vibration of one window of a high speed train has been measured for a running speed of 250 km/h. The corresponding interior noise and the noise in the wheel-rail area have been measured simultaneously. The experimental results show that the window vibration velocity has a similar spectral shape to the interior noise. Interior noise source identification further indicates that the window makes a contribution to the interior noise. Improvement of the window’s Sound Transmission Loss (STL) can reduce the interior noise from this Transmission path. An STL model of the window is built based on wave propagation and modal superposition methods. From the theoretical results, the window’s STL property is studied and several factors affecting it are investigated, which provide indications for future low noise design of high speed train windows.

Elke Deckers - One of the best experts on this subject based on the ideXlab platform.

  • Implications of Nonsub-Wavelength Resonator Spacing on the Sound Transmission Loss Predictions of Locally Resonant Metamaterial Partitions
    Journal of Vibration and Acoustics, 2020
    Co-Authors: L Van Belle, Claus Claeys, Elke Deckers, Wim Desmet
    Abstract:

    Abstract Locally resonant metamaterials have recently emerged and gained attention in the field of noise control engineering. The addition of resonant structures to a flexible partition on a sub-wavelength scale enables a targeted frequency range of strongly reduced vibration and Sound Transmission. These structures have been widely studied and are typically analyzed using infinite periodic structure theory. The implications of nonsub-wavelength resonator spacing on the Sound Transmission Loss of metamaterial partitions as well as on the representativeness of the infinite periodic structure modeling are, however, less well known. In this technical brief, it is shown that, although a shifted Sound Transmission Loss peak can be predicted for partitions with nonsub-wavelength resonator spacing when using infinite periodic structure modeling, the Sound Transmission Loss enhancement is not guaranteed for their finite structure counterparts.

  • metamaterial foam core sandwich panel designed to attenuate the mass spring mass resonance Sound Transmission Loss dip
    Mechanical Systems and Signal Processing, 2020
    Co-Authors: N G R De Melo Filho, Claus Claeys, Elke Deckers, Wim Desmet
    Abstract:

    Abstract Double panel partitions with a foam core suffer a poor Sound Transmission Loss at their mass-spring-mass resonance frequency. This paper considers the use of vibro-acoustic resonant metamaterials to improve the acoustic insulation performance at the frequency region of this resonance while adding only 8% of mass to the double panel, hence maintaining its lightweight characteristics. To design the metamaterial, dispersion curves are calculated through finite element unit cell analysis to predict the stop band frequency region. The resulting Sound Transmission Loss due to the stop band effect is predicted using Heckl’s model combined with the equivalent dynamic mass of the metamaterial, which is obtained from the dispersion curves analysis. This method allows taking into consideration complex resonator geometries and locally reacting material interlayers in the hosting panel. The designed metamaterial double panel is realised, and its experimentally measured insertion Loss surpasses the insertion Loss of the bare and equivalent mass addition double panels in the targeted frequency region. The predicted insulation agrees well with the measured performance, validating the proposed method.

  • the impact of damping on the Sound Transmission Loss of locally resonant metamaterial plates
    Journal of Sound and Vibration, 2019
    Co-Authors: L Van Belle, Claus Claeys, Elke Deckers, Wim Desmet
    Abstract:

    Abstract Vibro-acoustic locally resonant metamaterials with structural stop band behaviour can lead to a strongly increased Sound Transmission Loss in a targeted frequency range. This work assesses the impact of damping in the constituents of metamaterial plates on their acoustic insulation performance by means of infinite periodic and finite structure modelling. Besides applying the hybrid Wave Based - Finite Element unit cell method for infinite plates and the Finite Element Method for finite plates, qualitative dispersion curve based predictions are extended to quantitative Sound Transmission Loss approximations by introducing a dispersion curve based equivalent plate method. Both an idealised and a realisable locally resonant metamaterial plate are analysed. Damping in the resonators in particular is found to have an important impact in and around the stop band, reducing the Sound Transmission Loss peak, but improving the subsequent dip and reducing resonant Transmission in a broadening frequency range around the stop band. The damping influenced Sound Transmission Loss predictions for the realisable locally resonant metamaterial plate are experimentally validated by means of insertion Loss measurements. It is shown that, by including damping in the infinite periodic structure modelling, acoustic insulation performance predictions with improved accuracy are obtained.

  • Sound Transmission Loss of locally resonant metamaterial and phononic crystal plates
    2018 12th International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials), 2018
    Co-Authors: L Van Belle, Claus Claeys, Elke Deckers, Wim Desmet
    Abstract:

    This paper investigates the Sound Transmission Loss of locally resonant metamaterial and phononic crystal plates using unit cell and finite plate analysis. Plates with flexural wave stop bands can lead to enhanced vibro-acoustic performance. The acoustic insulation performance and frequency range depends, however, on the underlying stop band mechanism. While unit cell analysis suggests Sound Transmission Loss improvements regardless of the mechanism, the vibro-acoustic performance of their finite plate counterparts can differ significantly.

  • Sound Transmission Loss of a locally resonant metamaterial using the hybrid wave based finite element unit cell method
    2017 11th International Congress on Engineered Materials Platforms for Novel Wave Phenomena (Metamaterials), 2017
    Co-Authors: L Van Belle, Claus Claeys, Elke Deckers, Wim Desmet
    Abstract:

    This paper discusses the Sound Transmission Loss of a locally resonant metamaterial, by application of the hybrid Wave Based — Finite Element unit cell method. Since damping has an important influence on the vibro-acoustic attenuation performance of these metamaterials, the impact of damping in resonator and host structure on the Sound Transmission Loss is examined.

Claus Claeys - One of the best experts on this subject based on the ideXlab platform.

  • Implications of Nonsub-Wavelength Resonator Spacing on the Sound Transmission Loss Predictions of Locally Resonant Metamaterial Partitions
    Journal of Vibration and Acoustics, 2020
    Co-Authors: L Van Belle, Claus Claeys, Elke Deckers, Wim Desmet
    Abstract:

    Abstract Locally resonant metamaterials have recently emerged and gained attention in the field of noise control engineering. The addition of resonant structures to a flexible partition on a sub-wavelength scale enables a targeted frequency range of strongly reduced vibration and Sound Transmission. These structures have been widely studied and are typically analyzed using infinite periodic structure theory. The implications of nonsub-wavelength resonator spacing on the Sound Transmission Loss of metamaterial partitions as well as on the representativeness of the infinite periodic structure modeling are, however, less well known. In this technical brief, it is shown that, although a shifted Sound Transmission Loss peak can be predicted for partitions with nonsub-wavelength resonator spacing when using infinite periodic structure modeling, the Sound Transmission Loss enhancement is not guaranteed for their finite structure counterparts.

  • metamaterial foam core sandwich panel designed to attenuate the mass spring mass resonance Sound Transmission Loss dip
    Mechanical Systems and Signal Processing, 2020
    Co-Authors: N G R De Melo Filho, Claus Claeys, Elke Deckers, Wim Desmet
    Abstract:

    Abstract Double panel partitions with a foam core suffer a poor Sound Transmission Loss at their mass-spring-mass resonance frequency. This paper considers the use of vibro-acoustic resonant metamaterials to improve the acoustic insulation performance at the frequency region of this resonance while adding only 8% of mass to the double panel, hence maintaining its lightweight characteristics. To design the metamaterial, dispersion curves are calculated through finite element unit cell analysis to predict the stop band frequency region. The resulting Sound Transmission Loss due to the stop band effect is predicted using Heckl’s model combined with the equivalent dynamic mass of the metamaterial, which is obtained from the dispersion curves analysis. This method allows taking into consideration complex resonator geometries and locally reacting material interlayers in the hosting panel. The designed metamaterial double panel is realised, and its experimentally measured insertion Loss surpasses the insertion Loss of the bare and equivalent mass addition double panels in the targeted frequency region. The predicted insulation agrees well with the measured performance, validating the proposed method.

  • the impact of damping on the Sound Transmission Loss of locally resonant metamaterial plates
    Journal of Sound and Vibration, 2019
    Co-Authors: L Van Belle, Claus Claeys, Elke Deckers, Wim Desmet
    Abstract:

    Abstract Vibro-acoustic locally resonant metamaterials with structural stop band behaviour can lead to a strongly increased Sound Transmission Loss in a targeted frequency range. This work assesses the impact of damping in the constituents of metamaterial plates on their acoustic insulation performance by means of infinite periodic and finite structure modelling. Besides applying the hybrid Wave Based - Finite Element unit cell method for infinite plates and the Finite Element Method for finite plates, qualitative dispersion curve based predictions are extended to quantitative Sound Transmission Loss approximations by introducing a dispersion curve based equivalent plate method. Both an idealised and a realisable locally resonant metamaterial plate are analysed. Damping in the resonators in particular is found to have an important impact in and around the stop band, reducing the Sound Transmission Loss peak, but improving the subsequent dip and reducing resonant Transmission in a broadening frequency range around the stop band. The damping influenced Sound Transmission Loss predictions for the realisable locally resonant metamaterial plate are experimentally validated by means of insertion Loss measurements. It is shown that, by including damping in the infinite periodic structure modelling, acoustic insulation performance predictions with improved accuracy are obtained.

  • Sound Transmission Loss of locally resonant metamaterial and phononic crystal plates
    2018 12th International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials), 2018
    Co-Authors: L Van Belle, Claus Claeys, Elke Deckers, Wim Desmet
    Abstract:

    This paper investigates the Sound Transmission Loss of locally resonant metamaterial and phononic crystal plates using unit cell and finite plate analysis. Plates with flexural wave stop bands can lead to enhanced vibro-acoustic performance. The acoustic insulation performance and frequency range depends, however, on the underlying stop band mechanism. While unit cell analysis suggests Sound Transmission Loss improvements regardless of the mechanism, the vibro-acoustic performance of their finite plate counterparts can differ significantly.

  • Sound Transmission Loss of a locally resonant metamaterial using the hybrid wave based finite element unit cell method
    2017 11th International Congress on Engineered Materials Platforms for Novel Wave Phenomena (Metamaterials), 2017
    Co-Authors: L Van Belle, Claus Claeys, Elke Deckers, Wim Desmet
    Abstract:

    This paper discusses the Sound Transmission Loss of a locally resonant metamaterial, by application of the hybrid Wave Based — Finite Element unit cell method. Since damping has an important influence on the vibro-acoustic attenuation performance of these metamaterials, the impact of damping in resonator and host structure on the Sound Transmission Loss is examined.