| 1. |
- Bahrami, Soheila, et al.
(författare)
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Communicating the Acoustic Performance of Innovative HVAC Solutions
- 2018
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Ingår i: Springer Proceedings in Energy : Cold Climate HVAC 2018 - Cold Climate HVAC 2018. - 9783030006617 - 9783030006624 ; , s. 1085-1085
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Konferensbidrag (refereegranskat)abstract
- Recent years have seen considerable advancements in Demand Controlled Ventilation (DCV) systems aimed to improved energy efficiency and indoor environmental quality in buildings. A significant aspect of DCV systems is their impact on the acoustic comfort in buildings. This study is part of the Urban Tranquility project with a focus on innovative DCV systems. The objective is to add more understanding about communicating the acoustic performance of innovative HVAC solutions during the diffusion phase of the innovation. The research method is a case study on an innovative DCV system that shows how the acoustic performance of the system is communicated with the stakeholders and in what ways the applied methods can be improved. Data collection has been performed through reviewing relevant technical documents and software as well as semi-structured interviews with different stakeholders. The data has been analyzed with reference to three types of knowledge about an innovation. The results indicate that the acoustic performance of this new DCV system has not been effectively communicated due to inconsistent methods of expressing the information. This has revealed the need for developing a systematic method of communicating the acoustic information on DCV systems with the key stakeholders.
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| 2. |
- Bard, Delphine, et al.
(författare)
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Challenges for acoustic calculation models in "silent timber build", Part 1- FEM
- 2014
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Ingår i: INTERNOISE 2014 - 43rd International Congress on Noise Control Engineering : Improving the World Through Noise Control - Improving the World Through Noise Control. - 9781634398091 - 9780909882037 ; , s. 4424-4429
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Konferensbidrag (refereegranskat)abstract
- The project "Silent Timber Build" will develop new prediction tools for timber structures. There are several challenges that have to be overcome to provide a full prediction tool. The differences in weight, stiffness and density for wooden structures compared to traditional, heavy and more homogeneous structural material have repercussions on how the sound propagates throughout the structures, affecting the sound and vibration insulation performance and also theories to be used in prediction models. Finite element simulations have proved to be useful in the design phase in a certain low and very low frequency range. By further developing reliable finite element tools for low frequencies, the performance of future wooden constructions can be predicted in a full frequency range, saving both time and money as all calculations, and modifications can be done during the design phase. However the upper limit for using FEM has to be further investigated and then be merged with statistical methods. This article, following another article Part 2, will focus on medium and high frequency range calculations. For full-scale building, Virtual SEA method, as analytic and SEA approaches will be used in frequencies low enough in order to optimize the overlap to FEM.
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| 4. |
- Bard, Delphine, et al.
(författare)
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Psycho-vibratory evaluation of timber floors
- 2012
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Ingår i: [Host publication title missing].
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Konferensbidrag (refereegranskat)abstract
- In lightweight constructions using timber floors, vibrations can cause some inconveniences and nuisances for the inhabitants. In order to have a better estimation of an acceptable level of vibrations in dwellings, more studies addressing human response to vibrations are needed. In the study presented in this paper, measurements have been performed on five real floors in a laboratory environment. Different measurement protocols have been developed. Acceleration and deflection measurements were carried out while people were walking on the floors, or were sitting on a chair placed on the floors as the test leader was walking. In each case, people answered a questionnaire about their perception and experience of the vibrations. Independently of the subjective tests, acceleration measurements were carried out with a shaker as an excitation, in order to determine the characteristics of the first eigenmode. Also, heel-drop tests were performed using displacement gauges, in order to determine the top-floor deflection. This paper presents the results of these investigations.
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| 5. |
- Bard, Delphine, et al.
(författare)
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Reflection and transmission properties of wooden wall/floor building elements
- 2011
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Ingår i: 18th International Congress on Sound and Vibration 2011, ICSV 2011. - 9781618392596 ; 2, s. 1065-1072
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Konferensbidrag (refereegranskat)abstract
- Various modal methods are frequently used to investigate the vibration pattern in construction elements of a building in the low frequency range. The experimental determination of time average transmission and reflection coefficient has been developed for the large scale building structures. In this study, we investigate a mock up of a wall/floor junction. The wave approach is combined with the continuity equation. In this fashion both the flexural wave propagation and the in-plane wave motion can be captured. The miss-match impedance was also an important factor, since there is a change of material in the junction. The goal of using scattering matrix formulation is to separate the transmitted wave and the reflected wave as the structural wave propagates towards a wall/floor junction, but also to calculate the rate of wave conversion. One type of junction has been studied with the help of accelerometer matrices: the T junction of the floor/wall structure with its reinforcement beams.
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| 6. |
- Bard, Delphine, et al.
(författare)
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Silent Timber Build - Development of low frequency vibroacoustic prediction tools for lightweight wooden constructions
- 2016
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Ingår i: WCTE 2016 - World Conference on Timber Engineering. - 9783903039001
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Konferensbidrag (refereegranskat)abstract
- The goal of the Silent Timber Build project is to develop new prediction tools for timber structures. As a matter of fact, impact sound insulation in the low frequency range is a crucial point concerning satisfaction of lightweight wooden-based building residents. Floor systems are rather complex: multi-layered, multi-cavity, stiffened, with floor covering and ceiling (either rigidly connected, suspended, or completely independent), etc. Finite element (FE) simulations have proved to be useful in the design phase for the low frequency range (below 200 Hz). To address mid and high frequency range, other methods have to be implemented such as Statistical Energy Analysis (SEA). This paper concentrates on impact sound insulation prediction in the low frequency range by means of FE simulations and presents first validation steps for a wooden floor identified as representative in Europe. The main difficulties in impact sound insulation prediction are identified and discussed.
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