建筑环境学 07第7章建筑声环境 双语

1、23fc 600PcThe basic physical properties of sound wave-gas constant，1.4P0-air pressure0-air density731.25 Hz频率频率The basic physical properties of sound wave8x)ft(Pp(x,t)m22cosThe basic physical properties of sound wave910The basic physical properties of sound waveFigure 7-2 the spectrum of several noi

2、sesound pressure level (dB)center frequency of octave band (Hz)11The basic physical properties of sound wave12and and cpI 2 density of mediumThe measurement of sound13The measurement of sound14The human auditory The human auditory response has response has a logarithmic a logarithmic relation with t

3、he sound intensity, sound relation with the sound intensity, sound pressure.pressure.0lg10IILI 0lg20ppLp 0lg10WWLw hearing range valueThe measurement of sound15iII 2ipp 24rWI The measurement of sound16)101lg(1010121LLLL nLLlg101 The measurement of sound17sound level difference between two sound sour

4、cesThe measurement of sound18directivity of sound sourceSound pressure field formed by omnidirectional point source19directivity of sound source21The bodys responding principle to sound environment and noise assessment 22The bodys responding principle to sound environment and noise assessment23Audit

5、ory thresholdAuditory thresholdThe pain thresholdThe pain thresholdAuditory features 24Auditory features 25262728niALAiiL110/)(10lg10Li- sound pressure level of octave band Ai-A corrected value of response characteristics29BEquivalent continuous Equivalent continuous A sound level A sound level 2110

6、1210110tttLTAeqdtttLA/ )(,lg NiiniLiTAeqTTLAi1110/,/10lg1030Octave band center frequency(Hz)Octave band sound pressure level(dB)31Center frequency HzSound pressure level dB32 Center frequency HzSound pressure level dBcode for sound insulation design of civil buildings GB50118-2010In the condition wi

7、th closed windowgeneral requirements for residential high requirements for residentialschoolsoffice buildings3536absorptionEabsorptionThe principle of sound propagation and attenuationeflection coefficientacoustic absorptivityE0EE0EE-EE1037wpwpwwPrrLrrLLlg2044lg1022Sound propagation in the outdoor s

8、pace38ficientficient)1lg(410lg10)(0atVcSDDtLt The volume of the room Interface area of the room The rooms sound energy density J/m2The steady-state sound energy density J/m239)1lg(410lg10)(0atVcSDDtLt 40)(0mHzSf Directivity factor QAB)44lg(102RrQLLWp aaSR1sound absorption sound absorption and noise

9、reducing :and noise reducing :24 rQ QRr14. 0042)41lg(102rLLWp 44The acoustic properties of material and structure45The acoustic properties of material and structure46Sound absorption materials and structureSound absorption materials and structure48Sound absorption materials and structure49Perforated

10、 plate Perforated plate and and the cavity the cavity between wall between wall form form resonant resonant cavity.cavity.Sound absorption materials and structure50Sound absorption materials and structure51BIt is used when the room It is used when the room surface surface is insufficient to act is i

11、nsufficient to act as absorption surface.as absorption surface.Sound absorption materialsSound absorption materials and structure52Sound insulation and the properties of componentsB Sound insulation quantity and Sound insulation quantity and transmission transmission coefficientcoefficientdBR.R30001

12、01lg105330 4043lg20lg20lg2000 fmcmfR Sound insulation quantity of wallSurface densityfrequency55B The elastic The elastic deformation of the deformation of the air layer air layer has has vibration vibration reduction reduction effect.effect.B Air Air layer thickness layer thickness has a best has a

13、 best value.value.Sound insulation and the properties of components57Sound absorption, sound insulation, Sound absorption, sound insulation, sound sound elimination and vibration elimination and vibration isolationisolationNoise Control and Treatment Methods58sound sound absorption and noise reducti

14、onabsorption and noise reduction 59601)/(120 ffT6162. .The elimination of air flow noise63The elimination of air flow noise64The elimination of air flow noise65frequency Hzfrequency Hznoise reductionnoise reductionThe elimination of air flow noise66frequency Hznoise reductionThe elimination of air flow noise67application application 1: large 1: large open-open-type type office, reduce the office, reduce the mu