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Moriaux, Olivier (author), Zamponi, R. (author), Schram, Christophe (author)The empirical calibration of remote microphone probes (RMP), used to acquire wall-pressure fluctuations, can introduce spurious resonance into the sensor transfer function due to the difference in the pressure field inside the calibrator geometry over multiple calibration steps. Such spurious resonance subsequently propagates into the...journal article 2024
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Zamponi, R. (author), Avallone, F. (author), Ragni, D. (author), Schram, C. (author), van der Zwaag, S. (author)This paper elucidates the link between the near-wake development of a circular cylinder coated with a porous material in a low Mach-number flow and the related aerodynamic sound attenuation. It accomplishes this by formulating the cylinder flow-induced noise as a diffraction problem. The necessity for such an approach is driven by...journal article 2024
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Zamponi, R. (author), Satcunanathan, S. (author), Moreau, S. (author), Meinke, M. (author), Schröder, W. (author), Schram, C. (author)Integrating a porous material into the structure of an aerofoil constitutes a promising passive strategy for mitigating the noise from turbulence–body interactions that has been extensively explored in the past few decades. When a compact permeable body is considered in the aeroacoustic analogy derived by Curle to predict this noise source, a...journal article 2023
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Zamponi, R. (author), Satcunanathan, S. (author), Meinke, M. (author), Schröder, W. (author), Moreau, S. (author), Schram, C (author)Integrating porous materials into the structure of an airfoil constitutes a promising passive strategy for mitigating the noise from turbulence-body interactions that has been extensively explored in the past few decades. When a compact permeable body is considered in the aeroacoustic analogy derived by Curle to predict this noise source, a...conference paper 2022
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Amoiridis, O. (author), Zarri, A. (author), Zamponi, R. (author), Pasco, Y. (author), Yakhina, G. (author), Christophe, J. (author), Moreau, S. (author), Schram, C. (author)Sound emissions of an automotive engine cooling system are studied using both single-microphone directivity measurements and a rotating beamforming technique. These measurements provide reference acoustic data on such a system and some new understanding of the effect that the radiator induces on the distribution of sound sources. Indeed, the...journal article 2022
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Tamaro, S. (author), Zamponi, R. (author), Schram, C. (author)A small didactic wind tunnel demonstrator has been designed and manufactured at the von Karman Institute for Fluid Dynamics to illustrate the physical principles at stake in flow-induced noise generation, offer an audible perception of the effectiveness of noise-mitigation strategies, and serve as a practical test bench for aeroacoustic...conference paper 2022
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Kolen, B. (author), Žnidaršič, L.Y.D. (author), Voss, Andreas (author), Donders, Simon (author), Kamphorst, Iris (author), van Rijn, Maarten (author), Bonthuis, Dimitri (author), Clocquet, Merit (author), Schram, Maarten (author), Scharloo, Rutger (author), Boersma, Tim (author), Stobernack, Tim (author), van Gelder, P.H.A.J.M. (author)In response to the outbreak of SARS-CoV-2, many governments decided in 2020 to impose lockdowns on societies. Although the package of measures that constitute such lockdowns differs between countries, it is a general rule that contact between people, especially in large groups of people, is avoided or prohibited. The main reasoning behind these...journal article 2022
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Rego, Leandro (author), Ragni, D. (author), Avallone, F. (author), Casalino, D. (author), Zamponi, R. (author), Schram, Christophe (author)This paper investigates the application of flow-permeable materials as a solution for reducing jet-installation noise. Experiments are carried out with a flat plate placed in the near field of a single-stream subsonic jet. The flat plate is modular and the solid surface near the trailing edge can be replaced with different flow-permeable...journal article 2021
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Tamaro, Simone (author), Zamponi, R. (author), Ragni, D. (author), Teruna, C. (author), Schram, Christophe (author)Abstract: The flow field on solid and porous airfoils subjected to turbulence shed by an upstream cylindrical rod and the corresponding far-field noise radiations are studied through particle image velocimetry (PIV) and microphone measurements, respectively. Three different Reynolds numbers based on the rod diameter are considered in a range...journal article 2021
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Zamponi, R. (author), Schram, C (author), Moreau, S. (author), Ragni, D. (author)View Video Presentation: https://doi-org.tudelft.idm.oclc.org/10.2514/6.2021-2289.vid<br/><br/>A possible strategy for the reduction of the aeroacoustic noise generated by turbulence interacting with a wing profile, also referred to as leading-edge noise, is represented by the implementation of a porous medium in the structure of the airfoil....conference paper 2021
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Merino Martinez, R. (author), Luesutthiviboon, S. (author), Zamponi, R. (author), Rubio Carpio, A. (author), Ragni, D. (author), Sijtsma, P. (author), Snellen, M. (author), Schram, Christophe (author)In this paper, the performance of four acoustic imaging methods: conventional frequency domain beamforming (CFDBF), functional beamforming (FUNBF), enhanced high resolution CLEAN–SC (EHR–CLEAN–SC) and generalized inverse beamforming (GIBF), is investigated in terms of accuracy and variability. Three experimental test cases are considered: 1)...journal article 2020
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Zamponi, R. (author), Satcunanathan, S. (author), Moreau, S. (author), Ragni, D. (author), Meinke, M. (author), Schröder, W. (author), Schram, C. (author)A possible strategy for the reduction of the aeroacoustic noise generated by turbulence interacting with a wing profile, also referred to as leading-edge noise, is represented by the implementation of a porous medium in the structure of the airfoil. However, the physical mechanisms involved in this noise mitigation technique remain unclear....journal article 2020
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Zamponi, R. (author), Ragni, D. (author), Van de Wyer, N. (author), Schram, C. (author)The present work aims at evaluating the effectiveness of the use of porous materials for reducing airfoil turbulence-impingement noise. To pursue this objective, a porous NACA-0024 profile filled with melamine foam has been designed for comparison with a solid model. The porous media constituting the airfoil has been fully characterized in...conference paper 2019
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Merino Martinez, R. (author), Sijtsma, P. (author), Rubio Carpio, A. (author), Zamponi, R. (author), Luesutthiviboon, S. (author), Malgoezar, A.M.N. (author), Snellen, M. (author), Schram, Christophe (author), Simons, D.G. (author)Most acoustic imaging methods assume the presence of point sound sources and, hence, may fail to correctly estimate the sound emissions of distributed sound sources, such as trailing-edge noise. In this contribution, three integration techniques are suggested to overcome this issue based on models considering a single point source, a line...journal article 2019
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Hirschberg, L. (author), Hulshoff, S.J. (author), Collinet, J. (author), Schram, C. (author), Schuller, T. (author)In solid rocket motors, vortex nozzle interactions can be a source of large-amplitude pressure pulsations. Using a two-dimensional frictionless flow model, a scaling law is deduced, which describes the magnitude of a pressure pulsation as being proportional to the product of the dynamic pressure of the upstream main flow and of vortex...journal article 2018
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Reinders, Angèle (author), Übermasser, Stefan (author), van Sark, Wilfried (author), Gercek, Cihan (author), Schram, Wouter (author), Obinna, Uchechi (author), Lehfuss, Felix (author), van Mierlo, Barbara (author), Robledo, C.B. (author), van Wijk, A.J.M. (author)In this paper, a framework is presented for the evaluation of smart grid environment which is called the three-layer model. This three-layer model comprises three specific categories, or 'layers', namely, the stakeholder, market and technologies layers. Each layer is defined and explored herein, using an extensive literature study regarding...review 2018
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Guariglia, Daniel (author), Rubio Carpio, A. (author), Schram, Christophe (author)Shock-cell noise occurs in aero-engines when the nozzle exhaust is supersonic and shock-cells are present in the jet. In commercial turbofan engines, at cruise, the secondary flow is often supersonic underexpanded, with the formation of annular shock-cells in the jet and consequent onset of shock-cell noise. This paper aims at describing the...journal article 2018
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Stappers, P.J. (author), Kistemaker, N (author), Kistemaker, S (author), van den Burg, V. (author), von Ahlen, J (author), Guldner, S. (author), Schram, J. (author), van Veelen, J. (author)This booklet reviews Rich Insights!2010, an elective course for MSc students Industrial Design Engineering at Delft University of Technology, in cooperation with user centered design agency Muzus and various participating companies with a specific case study. In continuation of the previous <br/>course [with one company as a client] the 2010...book 2010
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Abbate, G. (author), Kleijn, C.R. (author), Thijsse, B.J. (author), Engeln, R. (author), Van de Sanden, M.C.M. (author), Schram, D.C. (author)The gas dynamics of a stationary hot-gas jet supersonically expanding into a low pressure environment is studied through numerical simulations. A hybrid coupled continuum-molecular approach is used to model the flow field. Due to the low pressure and high thermodynamic gradients, continuum mechanics results are doubtful, while, because of its...journal article 2008
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Sanders, F. (author), Steyaert, J. (author), Smeets, J. (author), Michel, H. (author), Doevendans, K. (author), Schram, A. (author), Van Zoest, J. (author)De vraag naar de betekenis van het wonen staat onverminderd in de belangstelling. Het traditionele thema van de volkshuisvesting wordt langzamerhand vervangen door concepten als het woondomein, of het denken in termen van woon- en leefmilieus, woondiensten en leefstijlmanagement. In dit hedendaagse woondomein is sprake van een steeds aanwezig...book 2006
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