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Tag: noise annoyance

12- Noise annoyance studied in different situations: a comparison of results obtained in situ and laboratory conditions

Napisane przez admin w dniu . Opublikowano w Publikacje.

Noise annoyance is one of the most common non-health effects of noise. Although related to sound levels in some way, annoyance ratings do not depend on this factor alone. Other factors are discussed, including a measurement condition. Researchers ask people to rate annoyance in their homes or in laboratory conditions. Some studies suggest that the results from these two conditions cannot be compared because different non-acoustic factors influence people’s judgments. To answer this question, we conducted a study in which people were asked to rate the annoyance of the same noise stimuli in both conditions. The results obtained so far show that there are no statistical differences for all noise levels.

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9- Wind Turbine’s Noise Annoyance Ratings Related to the Distance and Directivity of a Wind Turbine

Napisane przez admin w dniu . Opublikowano w Publikacje.

Wind turbine (WT) noise is commonly reported to be very annoying. There is a consensus in the literature that this is mainly due to the non-stationary nature of the signal, which is modulated by the movement of the blades. However, measuring and recording such noise is very difficult due to the fact that in most cases a single wind turbine is only one part of a larger complex (consisting of dozens of them). In this paper we describe a laboratory experiment in which people were asked to rate the annoyance of WT noise as a function of distance from a WT. Wind turbine noise was recorded from both sides, downwind and in line with the rotor plane. The results suggest that annoyance ratings decrease with increasing distance from a WT and that noise recorded from the side (in line with the rotor plane) is slightly more annoying than that recorded downwind. In addition, the RT used as reference noise was the least annoying source.

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5- Evaluation of Annoyance Due to Wind Turbine Noise Based on Pre-learned Patterns

Napisane przez admin w dniu . Opublikowano w Publikacje.

Annoyance due to wind turbine noise is usually assessed on the basis of surveys conducted among people living in the vicinity of turbines or in the laboratory conditions. Due to the fact that the latter are very different from natural conditions, we propose a solution to reduce this difference. Prior to the surveys, 50 participants were asked to familiarize themselves with 5 environmental signals. They were informed about the annoyance rating assigned to each signal (obtained earlier in laboratory conditions), expressed as a number between 0 (not annoying signal) and 10 (extremely annoying signal). Participants were then presented with new environmental sounds and asked to rate the annoyance caused by each sound, in accordance with the previously learned method. The analysis of our results shows that the variability of answers given by respondents at their homes is similar to those obtained earlier in laboratory conditions.

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1- Road, Tram and Aircraft Traffic Noise Annoyance Related to the Numberof Noise Events and the Equivalent Sound Level

Napisane przez admin w dniu . Opublikowano w Publikacje.

Noise mapping is based on long-term noise indicators, such as LN or LDEN. On the other hand, transportation intensity changes during a day (road traffic peak hours) or a year (more flights during holidays) and this variability is not reflected in single sound level values. We wanted to find out whether not only sound level but also the number of noise events is the factor influencing noise annoyance assessment. Ambisonic recordings of real traffic in a city were used. Road, tramway, and aircraft traffic were investigated and two factors were manipulated: the equivalent sound level value and the number of noise events. All stimuli were presented in an anechoic chamber. The results showed that sound level is always a statistically significant parameter while the number of events has an impact only for tramways and airplanes. Moreover, the difference is observed only between one or more subgroups, no matter what the sound level value was. For road traffic this relation was not found to be statistically significant. It was also shown that the existence of tramway bonus or airplane malus is linked with the number of noise events.

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