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Theses

Compréhension des mécanismes perceptifs associés à la gêne due aux bruit et vibrations du trafic ferroviaire en zone urbaine

Abstract : Vibrations due to railway traffic propagate from the tracks to inside neighbour houses. Residents who are exposed to vibrations are also exposed to railway noise. This combined exposure to noise and vibration leads to annoyance, as well as to some health issues. Few studies have been conducted to investigate this combined exposure in terms of annoyance. The goal of the thesis is to improve the knowledge concerning the perceptual phenomena involved when both railway noise and railway vibration occur at the same time. Experiments are carried out in controlled conditions for that purpose, using acoustic and vibratory recordings obtained in the vicinity of a railway track, inside a dwelling. A first study was conducted in order to test the validity of an experimental procedure allowing to collect annoyance responses in laboratory conditions. For several combinations of noise and vibration at different noise and vibration levels, annoyance responses were collected: 1) partial annoyance due to noise, 2) partial annoyance due to vibration and 3) total annoyance due to combined noise and vibration. Results of this first study led to a common procedure used for the rest of the experiments carried out during this thesis work. Studies about annoyance due to combined railway noise and vibration often use indices which only describe an amount of energy for each single exposure. Results can be contradictory. A second study was conducted in the laboratory in order to evaluate the influence of (noise and vibration) intensity on annoyance and to determine the reason of the contradictory results observed in the literature. The initial hypotheses made in the current work were that those could be due to the different ranges of variation of noise and vibratory levels, or to the different spectral contents of the stimuli used in the studies of interest. In the literature, there is a reported need of further investigations about the influence of parameters not related to vibration level (\textit{e.g.} frequency content, modulation) on railway vibration annoyance. During this thesis, work was done in the aim of a better understanding of the role of vibratory spectral content in specific annoyance due to vibration in the absence of noise. An experiment was conducted using artificial vibration stimuli based on the railway vibration recording spectra. The importance of parameters other than overall noise or vibration levels on variations of the annoyance due to combined railway noise and vibration was investigated during a last study. The stimuli were based on 19 noise and vibration recordings obtained inside a dwelling, after having reduced their duration to 10s and with controlled variations of noise and vibration levels. The results showed that the relative importance of temporal and spectral parameters of the combined exposure to noise and vibration was low as compared to that of energetic parameters.
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Philéas Maigrot. Compréhension des mécanismes perceptifs associés à la gêne due aux bruit et vibrations du trafic ferroviaire en zone urbaine. Vibrations [physics.class-ph]. Université de Lyon, 2019. Français. ⟨NNT : 2019LYSEI051⟩. ⟨tel-02629274⟩

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