登入選單
返回Google圖書搜尋
Traditional Rating of Noise Versus Physiological Costs of Sound Exposures to the Hearing
Helmut Strasser
出版IOS Press, 2005
主題Medical / GeneralNature / Environmental Conservation & ProtectionPOLITICAL SCIENCE / Public Policy / Environmental PolicyScience / Acoustics & SoundScience / Environmental Science
ISBN15860355339781586035532
URLhttp://books.google.com.hk/books?id=lJAeQsvfTRUC&hl=&source=gbs_api
EBookSAMPLE
註釋In occupational safety and health acts, ordinances, regulations, directives, standards and guidelines, A-weighted sound exposures, varying in level and duration, are traditionally converted to an 8-hour-average sound level by applying the 3-dB exchange rate. Under the prerequisite that the energy equivalent rating level does not exceed 85 dB(A)/8 h, even impulse noise exposures of up to 140 dB are declared harmless. Indeed, the mutual settlement of level and duration based on the concept of energy equivalence is correct as far as sound energy or physical dose is concerned. However, between thi.