| 1. |
- Beckenbauer, Thomas, et al.
(författare)
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Tyre/road noise prediction: A comparison between the SPERoN and HyRoNE models, Part 1
- 2008
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Ingår i: 7th European Conference on Noise Control 2008, EURONOISE 2008; Paris; France; 29 June 2008 through 4 July 2008. - 2226-5147. ; , s. 2933-2938
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Konferensbidrag (refereegranskat)abstract
- The SPERoN and HyRoNE models predict the pass-by tyre/road noise of a passenger car from intrinsic characteristics of the road surface. Both models are hybrid: they combine statistical laws with physical models. With a computing time of a few minutes (very quick compared to full physical models), they provide operational tools for tyre/road noise prediction. Particular fields of interest are road surface optimisation with respect to noise at the laboratory scale, conformity of production of a new surface and acoustic monitoring of roads. They are now implemented as user-friendly stand-alone applications. The presentation will address the principles of the models, their performances and their respective main fields of application. Part 1 will address the philosophy and the principles of the models.
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| 2. |
- Bergman, Penny, 1982, et al.
(författare)
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Emotion and meaning in interpretation of sound sources
- 2008
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Ingår i: 7th European Conference on Noise Control 2008, EURONOISE 2008, Paris, France, 29 June - 4 July 2008. - 2226-5147. ; , s. 3925-3929
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Konferensbidrag (refereegranskat)abstract
- Research regarding the perception of sound focuses in large on the acoustical properties of the sound. We argue that, for a more complete picture of sound perception, one must take the non-physical properties into account. By changing the emotional descriptor of a sound the perception in terms of level of annoyance will change. The present study investigates how a priming picture placing the origin of the sound to either a positive or negative environment affects the level of annoyance to same sound. 3 different sounds were used in the experiment, all based on pink noise. The participants were in the beginning of each sound exposed to a picture telling where the sound originated. The picture was either a positive environment (a picture of a waterfall) or a negative environment (a picture of a larger factory). While listening to the sounds the participants completed different performance tasks. In the end of each sound the participants rated level of annoyance to the sound. Results show that the annoyance ratings are significantly lower when primed with a positive picture. Results also indicate that for more attention demanding tasks this correlation is stronger. The findings are discussed in relation to theories of sound perception.
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| 3. |
- Colomo González, Miguel, et al.
(författare)
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Influence of bolted items on modal analysis performed on a car body
- 2008
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Ingår i: 7th European Conference on Noise Control 2008, EURONOISE 2008; Paris; France; 29 June 2008 through 4 July 2008. - 2226-5147. ; , s. 5475-5480
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Konferensbidrag (refereegranskat)abstract
- When performing Modal Analysis testing on a BIP (Body-in-Prime), some bolted items are included to better take into account their inuence on body stiffness. However, their contribution to the stiffness is not relevant in the frequency range accessible for modal analysis (usually up to 70 Hz on a BIP). On the other hand, these bolted items increase the dispersion between results obtained for nominally identical test objects. The question which arises is whether the items should be included in the BIP definition to perform modal analysis and, in this case, which is their inuence on the results? MIMO (Multi-Input-Multi-Output) measurements were carried out over three, nominally identical, BIPs. Several configurations were measured for each BIP, starting from the complete body the bolted items were progressively removed. A version of LMS PolyMAX method was programmed by Matlab to analyze the measured data. Conclusions about bolted items inuence are drawn based on the study of stabilization diagrams and modal parameters. The poles selection by the stabilization diagrams is one of PolyMAX method keys. The method understanding obtained from programming allows studying the ins and outs of poles selection. Polynomial order plays an important role in physical poles identification, especially for closely spaced modes. Results are shown to highlight its relevance.
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| 4. |
- Desarnaulds, Victor, et al.
(författare)
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Swiss pendulous hammer for decoupling measurement of service equipment in wooden multi-storey building
- 2012
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Ingår i: EURONOISE 2012 - 9th European Conference on Noise Control. - 2226-5147. - 9788001050132 ; , s. 224-229
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Konferensbidrag (refereegranskat)abstract
- The latest Swiss standard SIA181 (6-2006 edition [1]) introduces a new methodology regarding the tests to be performed in new constructions for assessing noise induced by the manipulation of service equipment in bathrooms and kitchens. However, this method has been developed especially for massive constructions. In this study, we are investigating the relevance of such method for timber frame building, with typical structures including boxes, frames, massive floors, retrofitting solutions. Decoupling performances are particularly important in lightweight constructions, and the pendulous hammer method is actually aiming at evaluating the decoupling of service equipments. The goals for this work are to determine the advantages and the limitations of this method for theses specific cases. For example, airborne contribution can become critical and deserves a specific control. This project should also identify the main propagation paths for equipment noise. A series of in-situ measurements has been performed for various building constructions and service equipments. Some additional laboratories investigations have been conducted to optimize the decoupling of service equipments to fulfill the Swiss SIA standard requirements.
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| 5. |
- Diapoulis, Georgios, 1981, et al.
(författare)
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Person identification from walking sound on wooden floor
- 2018
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Ingår i: Euronoise 2018. - 2226-5147. ; , s. 1727-1732
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Konferensbidrag (refereegranskat)abstract
- Human activities in building structures may vary to a great extend and daily mobility may be the cause of noise and vibrations. We focused on walking sound to identify different individuals based on airborne sound recordings. Our aim was to provide a description of high-level acoustical features that corresponds to walking sound and person identification. We present two levels of abstraction. The first level builds upon principal component analysis and provides the main sound characteristics of walking activity. For the second level of abstraction we provide higher-level acoustical features that better describe person identification.
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| 6. |
- Hoever, Carsten, 1979, et al.
(författare)
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A Simulation-Based Parameter Study of Car Tyre Rolling Losses and Sound Generation
- 2012
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Ingår i: Proceedings - 9th European Conference on Noise Control, EURONOISE 2012, Prague, 10-13 June 2012. - 2226-5147. - 9788001050132 ; , s. 926-931
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Konferensbidrag (refereegranskat)abstract
- Due to legislative changes within the EU there is an increased demand for improvements in car tyre rolling resistance and noise generation. Apart from measurement data, however, information about the relationship between rolling resistance and rolling noise generation is scarce. It is the goal of this study to investigate the fundamental physical processes connecting both areas. Additionally, it is evaluated whether a simultaneous reduction of both rolling resistance and rolling noise is possible or if this is contradicting requirement. A previously presented model for simulating the structural dynamics and rolling resistance of a rolling car tyre is extended to allow rolling noise calculation. The approach is based on a waveguide finite element model of the tyre. Tyre/road contact forces are obtained using a non-linear 3D contact model. The velocity field on the tyre surface is used to determine the radiated sound pressure based on a boundary element method. In a parameter study it is evaluated how much dissipation and sound radiation are affected by material properties, tyre construction and road surfaces. Due to the characteristics of the modelling approach, detailed information about dissipation and sound generation in different frequency regions, wave orders or parts of the tyre is available. The results show that rolling resistance and radiation are mainly low wave order, low frequency phenomena which are, at least partly, controlled by the same set of modes. This suggests that by modifying specific tyre properties reductions in both sound radiation and rolling resistance can be achieved.
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| 7. |
- Hoffmann, Alice, 1983, et al.
(författare)
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There’s a car coming? - Psychometric function for car pass-by in background noise based on simulated data
- 2015
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Ingår i: Euronoise 2015, 10th European Congress on Noise Control Engineering. - 2226-5147. ; , s. 2417-2421
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Konferensbidrag (refereegranskat)abstract
- To detect an approaching car in background noise is an important aspect of traffic safety. Therefore itis essential to understand the determinants that makes people recognize an approaching car especiallywhen the cars become very quiet at low speeds as it is the case for electrical cars for instance. Moststudies on the detection of passenger cars in background noise are based on recorded signals. Thisrequires that suitable recordings are available both for the background sound as well as the test sound(i.e. the sound of the approaching vehicle). Due to the limited control of such situations the degreesof freedom to be varied in such experiments is limited as well. In the presented study a differentapproach has been employed. The utilized sounds are based on an auralization method that allowsfor simulating vehicle sounds including both tyre/road noise and propulsion noise. Single car eventscan thus be superposed to background sound with full control of all relevant parameters. The usedauralization method has in earlier studies been validated for giving good perceptual ratings comparedto recorded sounds. The method allows for evaluating the psychometric functions for single parametersand hopefully give a deeper understanding of the perceptual space for a car in background noise. Inthe present study the reaction time is measured for the detection of a car (test vehicle) passing byin the presence of background noise from a road with high traffic flow. The distance between the thepath of the test vehicle and the highly trafficked road is varied. All other parameters (i.e. car-type,road surface, speed, etc.) are kept constant. The study shows that there is a logarithmic relationbetween the response times and the distance between the the track of the test car and the road withhigh traffic volume. At the same time there is a linear relation between reaction time and signal tonoise ratio (i.e. the equivalent sound pressure level in relation to the background level).
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| 8. |
- Hornikx, Maarten, 1980, et al.
(författare)
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The potential of vegetation for reducing road traffic noise at urban quiet sides
- 2012
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Ingår i: Proceedings - 9th European Conference on Noise Control, EURONOISE 2012, Prague, 10-13 June 2012. - 2226-5147. - 9788001050132 ; , s. 949-954
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Konferensbidrag (refereegranskat)abstract
- Reduction of noise from road traffic is one of the multiple benefits of employing vegetation in urban areas. In particular, application of vegetation to façades and roofs of residential buildings might be effective for increasing the quietness at the traffic-free side of these buildings, the quiet sides. The potential of reducing road traffic noise at the quiet side of buildings by a variety of vegetation-related measures is here studied by 2D and 3D full-wave numerical methodologies. The considered vegetation measures include wall vegetation systems, green roofs, vegetated low noise barriers at roof edges and combinations of such treatments. Green roofs appear to have the highest potential to enhance quietness at the traffic-free side of the buildings. For newly built roof systems, favourable combinations of roof shape and vegetation have been identified. Vegetated façades are efficient mostly when applied to narrow geometries with otherwise acoustically hard façade materials.
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| 9. |
- Hui, X, et al.
(författare)
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The outdoor soundscape design of Swedish hospitals
- 2012
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Ingår i: Ninth European Conference on Noise Control (Euronoise) 2012, 10-13 June, Prague, Czech Republic. - 2226-5147. - 9788001050132
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Konferensbidrag (refereegranskat)
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| 10. |
- Klein, Philippe, et al.
(författare)
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Tyre/road noise prediction: A comparison between the SPERoN and HyRoNE models, Part 2
- 2008
-
Ingår i: 7th European Conference on Noise Control 2008, EURONOISE 2008; Paris; France; 29 June 2008 through 4 July 2008. - 2226-5147. ; , s. 2939-2944
-
Konferensbidrag (refereegranskat)abstract
- The SPERoN and HyRoNE models predict the pass-by tyre/road noise of a passenger car from intrinsic characteristics of the road surface. Both models are hybrid: they combine statistical laws with physical models. With a computing time of a few minutes (very quick compared to full physical models), they provide operational tools for tyre/road noise prediction. Particular fields of interest are road surface optimisation with respect to noise at the laboratory scale, conformity of production of a new surface and acoustic monitoring of roads. They are now implemented as user-friendly stand-alone applications. The presentation will address the principles of the models, their performances and their respective main fields of application. Part 2 will address the performances of the models and their area of applications.
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