| 1. |
- Bard, Delphine, et al.
(author)
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Challenges for acoustic calculation models in "silent timber build", Part 1- FEM
- 2014
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In: 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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Conference paper (peer-reviewed)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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| 3. |
- Bard, Delphine, et al.
(author)
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In situ and laboratory measurement of service equipment decoupling in lightweight constructions
- 2013
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In: 42nd International Congress and Exposition on Noise Control Engineering 2013 (INTER-NOISE 2013) : Noise Control for Quality of Life - Noise Control for Quality of Life. - 9781632662675 ; 3, s. 1801-1809
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Conference paper (peer-reviewed)abstract
- The latest version of the Swiss standard for building acoustics (SIA181) introduced a new measurement method, based on a balanced- Arm hammer, for evaluating the decoupling performance of service equipment. This method was developed for reproducing in a standard manner the manipulation of service equipment in bathrooms and kitchens. In this study, we are investigating the relevance of such method for timber frame building where decoupling performances are particularly important. This study determines the advantages and the limitations of this methodology, which allows identifying the main propagation paths for equipment noise. A series of in-situ measurements has been performed to identify the best building constructions, service equipment configurations but also some workmanship errors. Laboratories investigations have also been conducted to understand and optimize the decoupling of two type service equipment systems.
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| 5. |
- Bard, Delphine, et al.
(author)
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Psycho-vibratory evaluation of timber floors
- 2012
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In: [Host publication title missing].
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Conference paper (peer-reviewed)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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| 6. |
- Bard, Delphine, et al.
(author)
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Reflection and transmission properties of wooden wall/floor building elements
- 2011
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In: 18th International Congress on Sound and Vibration 2011, ICSV 2011. - 9781618392596 ; 2, s. 1065-1072
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Conference paper (peer-reviewed)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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| 7. |
- Bard, Delphine, et al.
(author)
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Swiss pendling hammer for decoupling measurement of Swiss methodology for decoupling measurement of service equipment in buildings
- 2012
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In: 41st International Congress and Exposition on Noise Control Engineering 2012, INTER-NOISE 2012. - 9781627485609 ; 12, s. 10293-10301
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Conference paper (peer-reviewed)abstract
- The latest edition of the Swiss standard SIA181(2006) Protection against noise in Buildings [1], introduces a new methodology regarding the tests to be performed in new constructions for noise induced by human using service equipment in bathroom and kitchen. In this method, a specific pendling hammer has been developed especially for evaluating the decoupling efficiency of service equipment. The goals for this work are to determine the advantages and the limitations of method especially for lightweight constructions. For example, in some cases the airborne contribution of the pendling hammer noise can become critical and leads to an overestimation of the uncoupling. This project should also identify the main propagation paths for equipment noise. A large number of in-situ measurements have been done for various building constructions and services equipment in Swiss and Swedish constructions. Some additional laboratories investigations have been conducted to optimize the decoupling of service equipment to fulfill the Swiss requirements.
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