Effect of the Properties of Sound Source and Transmission for the Evaluation of Subjective Response by the Exposure Time of Transportation Noise

Abstract

Evaluation on the environmental noise is carried out by surveying subjective response of residents with physical measurement of noise during long period in field. Particularly field survey is used to make regulations from the analysis on how many people are annoyed for specific noise level, and laboratory test used to analyze the relationship between physical parameters of noise and subjective responses. In the laboratory controlling the variables is easy but the results could be biased because the condition in room would be different with field. Most of all noise exposure time is considered to be different with real situation, and this study aimed to evaluate the subjective response by exposure time of transportation noise, by applying three kinds of variable how much they give effects on the annoyance as the exposure time is operating condition, windows type and sound level. As a result there was somewhat difference between operating type and annoyance, which is caused by the sound characteristics operated in different condition. However the window type didn't give much effect to the annoyance as much as sound type. This means that the subjective response could give similar result by exposure time even for different window types. Most of all, the main factor affecting subjective response is considered to be the sound level and the exposure time.

Indoor Noise Annoyance Due to Transportation Noise

“…The sound transmission class (STC) ratings are 30 for single windows, 39 for double windows with an expanded balcony, and 41 for double windows without an expanded balcony. The appropriate exposure time was set to 10 min based on a preceding study (Kim et al, 2012).…”

“…The duration of noise is an important factor in the subjective feeling of presence. A preceding study (Kim et al, 2012) verified that the exposure time of transportation noise affects the subjective response and that 10 min of exposure is appropriate for obtaining stable subjective responses. In South Korea, domestic standards on transportation noise currently follow noise measurement standards for apartment complexes that have been enforced by the Ministry of Land, Transport and Maritime Affairs since January 2008.…”