建筑物理 第三版 刘加平 复习资料（Review of architectural physics third edition of Liu Jiaping）.docVIP

建筑物理 第三版 刘加平 复习资料（Review of architectural physics third edition of Liu Jiaping） This paper makes a contribution from the north wind DOC documents may experience poor browsing on the WAP side. It is recommended that you select TXT first or download the source file to the local machine. This book is Liu Jiaping, editor in chief of Construction Industry Publishing House Chapter 1 basic knowledge of architectural acoustics 1. Understand the basic nature of sound, clear sound power, sound intensity, sound pressure, sound power level, sound intensity level, sound pressure level, frequency and spectrum and other related architectural acoustics physical concepts and calculation methods. The sound power of radiation sound source in a unit of time within the sound, symbol: W, unit: w (W), micro watt (W) sound intensity in the unit time, the unit area perpendicular to the direction of the acoustic wave propagation. Symbol: I, unit: (W /m2), sound intensity and sound power calculation: I= w/s sound pressure: the instantaneous pressure in the medium relative to the pressure change without sound wave. Symbol: P, N/m2, Pa (unit: PA), B (BA). 1N/m2 = 1 Pa = 10 b SPL: a sound pressure and the common logarithm of the ratio of the reference pressure multiplied by 20. Lp = 20lg (p/p0) (dB) (between 0~120 dB) type in P0 - reference sound pressure (base pressure), P0 = 2 10 - 5N / m2, make the person feel pain for the upper ear pressure 20N / m2: sound intensity and sound intensity level reference sound a sound is strong the common logarithm multiplied by 10. LI = 10lg (I/I0) (dB) (between 0~120 dB) In I0, the reference sound intensity (base sound intensity), I0 = 10 - 12W/m2, make the upper limit of sound pressure of human ear feel 1W/m2. Sound power level: the common logarithm of the ratio of the sound power of a sound to the reference sound power multiplied by 10. LW = 10lg W/WO (dB) (between 0~120 dB) Formula W0: reference sound power (reference sound power), W0 = 10 - 12W sound supe