کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
754653 895875 2009 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Study on the effect of sound duration on the annoyance of helicopter noise by applying a technique of time compression and expansion of sound signals
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
پیش نمایش صفحه اول مقاله
Study on the effect of sound duration on the annoyance of helicopter noise by applying a technique of time compression and expansion of sound signals
چکیده انگلیسی

The number of helicopter operations has rapidly increased during the last 20 years in Japan. Helicopter noise sounds different from other aircraft; the waveform of the sound pressure is impulsive and the signal duration is relatively long. The Environmental Agency of Japan implemented new guidelines for evaluating noise exposure around small airports, including heliports, in 1990. This study was executed in connection with the development of provisional guidelines. Psychoacoustic experiments were carried out to identify an evaluation index for helicopter noise. In order to examine the effect of duration independently, we not only used original sound recordings, but also synthesized sound signals. The durations of these sound signals were time compressed or expanded without degrading the quality of the original sound recording. The test results show that the effect of duration is significant, and that the A-weighted sound exposure level is a better index than the maximum A-weighted sound pressure level for the evaluation of helicopter noise.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Acoustics - Volume 70, Issue 9, September 2009, Pages 1200–1211
نویسندگان
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