THE EFFECTS OF FLUCTUATION FACTORS OF PERIODICALLY NON-STEADY NOISES ON DISTURBANCE AND NOISINESS IN WORKING ENVIRONMENT : A study on evaluation of non-steady noises II

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  • 作業時に規則的非定常騒音の変動要因が妨害度とやかましさに及ぼす影響 : 非定常騒音の評価に関する研究II
  • 作業時に規則的非定常騒音の変動要因が妨害度とやかましさに及ぼす影響--非定常騒音の評価に関する研究-2-
  • サギョウジ ニ キソクテキ ヒテイジョウ ソウオン ノ ヘンドウ ヨウイン ガ

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Abstract

A laboratory study was carried out to investigate disturbance and noisiness of periodically non-steady noises in four task conditions. Totally 326 subjects participated in experiments. There were two main variables : the range of level fluctuation was from 0 to 40 dB and the repetition rate varied from 0. 25 to 4 Hz. The noises were exposed at two levels, 60 and 70dB L_<eq>. Task conditions were articulation test, intelligibility test, calculation, and reading, and their exposure durations were respectively about 6, 8, 3, 2.5 minutes. The task performance was investigated and the relation between disturbance or noisiness and performance was also discussed. The conclusions are summarized as follows. 1) In task conditions in which task performance is significantly affected by noises, disturbance and noisiness are influenced considerably by performance and have high correlation with it. 2) In task conditions in which task performance is not significantly affected by noises, disturbance and noisiness increase with range of level fluctuation. 3) In the same conditions as 2), the effect of repetition rate was not reasonably found, but consistently disturbance or noisiness tends to rise at 1 Hz in the case of triangular noises and drop at 1 Hz in rectangular noises. 4) It is considered that the complex effect of repetition rate as mentioned above is contributed by the interference of concentration on task and the rhythm of task exept for the effect of fluctuation factors.

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