16:45 pm
3909 - Study on human reactions to vibration from blasting activities nearby dwellings
Iiris Turunen-Rindel, MSc | Standards Norway | Norway
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Authors:
Iiris Turunen-Rindel, MSc | Standards Norway | Norway
Ronny Klæboe, PhD | Institute of Transport Economics | Norway
Karin Norén-Cosgriff, MSc | Norwegian Geotechnical Institute | Norway
Human reactions to vibration were studied in connection to preparation of Norwegian Standard, NS 8141-1. The standard concerns vibration that may cause building damage. The study started due to experience with complaints, fear, disturbances and other human reactions on vibration from construction work, especially blasting activities. Human reactions are likely to occur at much lower vibration levels than those causing building damage. The human reactions cause delays and problems at construction work that may be avoided. The aim was to provide some guidance on expected level of annoyance, and factors affecting human reactions to the blasting activities. The study was conducted as a socio-vibrational survey on people’s annoyance on vibrations from blasting. Vibration velocities were obtained for 520 respondent dwellings in seven study areas nearby construction sites. The inhabitants got a written questionnaire that could be responded through a website. Exposure-effect relationships with acceptable statistical error bands were established with weighted (frequency filter related to building damage) and unweighted peak values of vibration velocity. The resulting exposure-effect curves were included in an informative Annex in the Norwegian Standard.
17:15 pm
3653 - A Citizen Science Initiative: Acoustical Characterisation of Human Environments
Huub Bakker, Prof. Dr. | Massey University | New Zealand
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Authors:
Huub Bakker, Prof. Dr. | Massey University | New Zealand
Mariana Alves-Pereira, Prof. Dr. | Lusófona University | Portugal
Rachel Summers, Prof. | Massey University | New Zealand
The characterisation of acoustical environments where humans are present is currently only available from acoustics experts. The investigations generally return derived measures such as 10-minute, A-weighted measurements, and sometimes 10-minute, ⅓-octave bands and FFT Leqs, meaning that further analysis cannot be performed since the primary data, the actual sound, is no longer available. Obtaining full-spectrum IFLN data for monitoring normally involves complex, non-standard instrumentation systems. Furthermore, the cost of such detailed investigations skews the frequency of investigations towards those environments where the owners can afford them.
As a component of a multi-disciplinary approach to such investigations a Citizen Science Initiative is presented to capture high quality recordings from diverse environments where humans are present. Coupling with event identification/documentation, following an established protocol permits, a cost/time effective process for assessments. A suitable recording system has been developed to support the initiative and a comprehensive protocol is available to ensure that recordings approach professional quality. A library of quality recordings will allow subsequent analysis and reanalysis by researchers in future.