【摘要】：伴隨城市交通的快速發(fā)展,交通噪聲給人們帶來(lái)了巨大的困擾,越來(lái)越多的學(xué)者開(kāi)展了對(duì)交通噪聲的降噪研究。在一處國(guó)槐綠化帶進(jìn)行了噪聲衰減實(shí)驗(yàn),探究國(guó)槐綠化帶的降噪特性和降噪模型,實(shí)驗(yàn)結(jié)果表明： (1)八家國(guó)槐實(shí)驗(yàn)林總體對(duì)500Hz、2000Hz、4000Hz噪聲削減效果好,對(duì)1000H、125Hz、8000Hz衰減效果差。2.5m以下部分對(duì)500Hz噪聲衰減量最大,；3m以上部分對(duì)中高頻的2000Hz和4000Hz噪聲衰減效果最佳。 (2)聲波在林內(nèi)距聲源17m-21m范圍內(nèi)沒(méi)有發(fā)生紊亂的反射、干涉、折射等現(xiàn)象,認(rèn)為聲波隨距離增加近似穩(wěn)定、有序地衰減。 (3)得到了國(guó)槐綠化帶距聲源17m范圍外的空間降噪模型。 本研究所得模型可以為路旁綠化帶設(shè)計(jì)時(shí)提供植被帶降噪值的參考,根據(jù)聲源聲級(jí)、防護(hù)對(duì)象的噪聲限值可計(jì)算出所需配置的國(guó)槐林帶寬度。
[Abstract]:With the rapid development of urban traffic, traffic noise has brought people a great deal of trouble. More and more scholars have carried out research on the noise reduction of traffic noise. The noise attenuation experiment was carried out in a green belt of Sophora japonica, and the characteristics and model of noise reduction in green belt of Sophora japonica were studied. The results showed that: (1) eight experimental forests of Sophora japonica had good effect on noise reduction of 500Hz / 2000Hz0 / 4000Hz. It is the best for the attenuation of 2000Hz and 4000Hz noise in the middle and high frequency of 2000Hz and 4000Hz in the part below 1000H 125Hz. The attenuation effect of the noise below 2.5 m is the highest in the part above 3 m and the maximum attenuation amount of the noise in 500Hz is less than 3 m. (2) there are no abnormal phenomena such as reflection, interference and refraction in the 17m-21m range of distance sound source in the forest. It is considered that the sound wave is approximately stable and attenuates in order with the increase of distance. (3) the spatial noise reduction model of Sophora japonica is obtained in the range of 17 m from the green band of Sophora japonica. The model can be used as a reference for the noise reduction of vegetation belt in the design of roadside green belt. According to the sound level of the sound source, the noise limit value of the protected object can be calculated for the width of the forest belt of the national Sophora japonica forest that needs to be configured.
【學(xué)位授予單位】：北京林業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TB53;X173

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