| 1. |
- Bader Eddin, Mohamad, et al.
(författare)
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A sound insulation prediction model for floor structures in wooden buildings using neural networks approach
- 2021
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Ingår i: Proceedings of INTER-NOISE 2021 - 2021 International Congress and Exposition of Noise Control Engineering. - 0736-2935. - 9781732598652
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Reliable prediction tools are yet to be developed for estimating the accurate acoustic performance of lightweight structures, which are vital especially in the design process. This paper presents a sound insulation prediction model based on artificial Neural Networks (NN) to estimate acoustic performance for airborne and impact sound insulation of floor structures. At an initial stage, the prediction model was developed and tested for a small amount of data, specifically 67 laboratory measurement curves in one third octave bands. The results indicate that the model can predict the weighted airborne reduction index Rw for various floors with a maximum error of 1 dB. The accuracy decreases with errors up to 9 dB for the weighted index for impact sound Ln,w, in cases of complex floor configurations due to large error deviations in high frequency bands between the real and estimated values. The model also shows a very good accuracy in predicting the airborne and impact sound insulation curves in the low frequencies, which are of higher interest usually in building acoustics.
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| 2. |
- Flodén, Ola, et al.
(författare)
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Robust prediction metrics for structure-borne noise in timber buildings
- 2021
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Ingår i: Proceedings of INTER-NOISE 2021 - 2021 International Congress and Exposition of Noise Control Engineering. - 0736-2935. - 9781732598652
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- An investigation of velocity-based vibration metrics for predicting structure-borne noise in timber buildings is presented in the paper. The purpose of the study is to derive a robust metric based solely on the vibration response and with a known correlation to the acoustic response in a room. Such a measure is useful for establishing simplified numerical prediction models and for making robust concept assessments. A set of 100 models, based on an example case of a massive-timber building, was generated as a statistical basis for evaluating the degree of correlation between noise and vibration metrics for sound transmission between storeys. The noise metric was calculated by spatial averaging of the sound pressure in the receiver room, while the vibration metric was calculated by spatial averaging of the normal-to-surface-direction velocity in the receiver room. The degree of correlation for linear regression between the noise and vibration metrics was evaluated for various frequency bands. Generally, a high degree of correlation was observed.
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| 3. |
- Forssén, Jens, 1968, et al.
(författare)
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Road traffic noise disease burden estimates for a model study of varying urban morphology cases
- 2021
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Ingår i: Proceedings of INTER-NOISE 2021 - 2021 International Congress and Exposition of Noise Control Engineering. - : Institute of Noise Control Engineering (INCE).
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Konferensbidrag (refereegranskat)abstract
- In a model study containing 31 different building morphologies in an urban setting, road traffic noise exposure has been calculated and analysed. For five of the building morphologies also vegetation surfaces on facades and roofs were studied. The facade exposure levels were analysed for both smaller (single-sided) flats and larger (floor-through) flats, considering the direct exposure from the roads as well as the non-direct exposure at noise-shielded positions like inner yards, applying a noise mapping software in combination with a prediction model for the non-direct exposure. Using noise indicators Lden and Lnight, the disease burden, in terms of DALY (Disability-Adjusted Life Years) per person, was estimated and analysed, via predictions of annoyance and sleep disturbance. As general trends, perimeter blocks were shown to perform better than morphologies with less enclosed yards and densification was shown to result in improved performance, assuming a constant traffic flow. In addition, complementing the perimeter blocks with towers was shown to enable improvement. Furthermore, traffic concentration by locating all local traffic to a single road was shown to be beneficial, increasingly so by widening the road. The use of facade vegetation was shown to result in significant overall improvement.
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