Catherine Marquis-Favre, Prof. Dr. | Univ Lyon, ENTPE, LGCB | France
Laure-Anne GILLE, PhD | Univ Lyon, ENTPE, LGCB / CEREMA Direction Territoriale Ile-de-France | France
Noise annoyance affects health and well-being of residents in urban areas. For European cities of more than 100,000 inhabitants, strategic noise maps characterize noise exposure using the index Lden. This index was also used to propose dose-effect relationships. However, different studies showed that Lden insufficiently characterizes noise annoyance.
Indeed, noise annoyance is influenced by various acoustical features (e.g. spectral distribution of energy) and non-acoustical factors (e.g. noise sensitivity). Noise annoyance models based on noise sensitivity and different psychoacoustic indices were proposed in literature. The psychoacoustic indices account for auditory sensations. It will be interesting to test such models using in situ noise annoyance and noise sensitivity data. The difficulty lies in the lack of the values of psychoacoustic indices in database built from socio-acoustic survey. Thus a methodology is proposed in this paper to estimate the values of different psychoacoustic indices. Therefore models proposed for aircraft noise annoyance are tested. Their predictive power is assessed using survey data. Results show that the models led to an improvement in comparison with model only based on Lden.
3694 - Annoyance due to railway noise and vibrations: A comparison of two methods of collecting annoyance scores
Philéas Maigrot, PhD | Univ Lyon, LGCB and LVA | France
Catherine Marquis-Favre, Prof. Dr. | Univ Lyon, ENTPE, Laboratoire Génie Civil Bâtiment | France
Etienne Parizet, Prof. Dr. | Univ Lyon, INSA-Lyon, Laboratoire Vibrations Acoustique | France
An experiment has been conducted in order to determine if the method of collecting partial and overall annoyance scores – during separated sessions or during the same session – has an influence on the participants’ answers. The experiment used controlled noise and vibration stimuli corresponding to a train pass-by, recorded inside a house in the vicinity of a railway track.
32 participants attended 4 sessions A, B, C and D during each of which they were presented with 16 combinations of noise and vibrations. They had to evaluate partial annoyance due to noise in the presence of vibration (session A), partial annoyance due to vibrations in the presence of noise (session B) or overall annoyance (session C). Lastly, they were asked to rate partial and overall annoyances in a same session (session D).
Results show that partial and overall annoyance scores, simultaneously collected during session D, were quite similar to the ones respectively collected during dedicated sessions. Furthermore, this method is convenient as a reduced number of stimuli is presented to each participant.
3958 - Community response to mixed traffic noise sources: assessing the overall effects of a soundscape
Sufficient data refer to the public health relevance of mixed traffic sound exposure. Furthermore, the consideration of combined sound exposure is required in legal procedures (e.g. environmental health impact assessments). Nevertheless, current practice still uses single exposure response functions. It is silently assumed that standard exposure-response curves accommodate also for mixed exposures - although some evidence from experimental and field studies casts doubt on this assumption.
In this paper we use own data to apply several approaches to study deviations from standard exposure-response curves and its determinants in the case of mixed traffic exposure.
The results show several limitations of the current approaches. Even facing the two inherent methodological limitations (energy equivalent summation of sound, rating of overall annoyance) the consideration of main contextual factors jointly occurring with the sources (such as vibration, air pollution) or the coping options (associated with building structure, topography) increase the variance explanation considerably. However, the additional contributions vary significantly depending on the source combination. Especially in the case of a three source exposure situation the overall annoyance is already high at lower levels.
2453 - Effects of floor impact noise on people – annoyance and physiological responses
Sang Hee Park | University of Liverpool | United Kingdom
Pyoung Jik Lee, PhD | University of Liverpool | United Kingdom
This paper discusses the effects of floor impact noise, which is one of the important issues in multi-family residential buildings. First, semi-structured interviews were carried out and a conceptual model was developed to show the relationships between non-acoustic factors and perception of floor impact noise. Secondly, a social survey (N=487) was conducted to validate the conceptual model and significant relationships between noise disturbance, annoyance, coping and health concerns were found. Thirdly, two laboratory experiments were performed to investigate psycho-physiological responses (e.g., annoyance, heart rate and electrodermal activity) to floor impact noise. Sound pressure level (SPL) had significant impacts on changes in psycho-physiological responses; for instance, heart rate decreased with increasing SPL. Noise sensitivity significantly affected noise annoyance and heart rate when noise levels were greater than 50 dBA, and electrodermal activity and respiration rate at above 60 dBA. Lastly, adjectives representing emotion and feelings induced by floor impact noise were collected and classified into four groups. Perception of noise was assessed using adjectives at different noise levels and the noise annoyance was then explained using emotional words.
3813 - Dose-response curves for satisfactory sound insulation between dwellings
Ronny Klæboe, PhD | Institute of Transport Economics | Norway
A socio-acoustic survey in Norway included field measurements of sound insulation in 600 dwellings, whose residents received a survey to evaluate of the sound quality subjectively. 97% of the dwellings were apartments in multi-unit houses. The questionnaire followed ISO/TS 15666 using a five-step verbal evaluation of the degree of annoyance. By means of logit analysis, dose-response curves were derived for airborne and impact sound insulation between dwellings. Both the normal frequency range down to 100 Hz and the extended frequency range down to 50 Hz were evaluated. For airborne sound insulation, the inclusion of low frequencies did improve the correlation in relation to music with bass and drums, but not in relation to speech sounds. For impact sound, the results were strongly in favour of including the low frequencies. The findings in this investigation confirm results from the literature pointing at a slope of 4 percentage points per dB in the middle range of the curves. On this basis, generalised dose-response curves for airborne and impact sound insulation are presented.
3814 - Perceived sound quality in dwellings in Norway
An extensive socio-acoustic survey assessing the perceived sound and noise quality in multi-unit, residential buildings in Norway has been done. The building are all supposed to comply with the present building code and requirements. Based on field measurements of sound insulation in 600 dwellings, a questionnaire survey was sent to nearly 4000 residents from which 702 responses were obtained. Thus, the questionnaire responses could be evaluated based on the actual measured sound quality in the respective buildings. The quantity and range in the measurement results allowed for the establishment of exposure-effect relationships for annoyance caused by both airborne and impact sound insulation. Additionally, annoyance due to different sound sources and levels were assessed, as well as effects of using light or heavy building structures, frequency range required in the evaluation of sound insulation, willingness to pay for improved sound quality, and whether people limit themselves to ensure that neighbours are not annoyed.