本文選題：Virtual.lab　切入點(diǎn)：硅酸鹽　出處：《西南交通大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：硅酸鹽基多孔材料具有良好的環(huán)境適應(yīng)性及吸聲性能,取材廣泛,加工制備工藝簡單,成為目前應(yīng)用廣泛的吸聲材料。采用快硬快凝水泥為主要原材料制備了硅酸鹽基多孔吸聲材料。研究結(jié)果表明,該種材料在道路屏障、軌道交通路面等領(lǐng)域具有良好的吸聲降噪效果,在一定程度上解決了日益困擾人們生活工作中的噪聲問題。硅酸鹽基多孔材料的吸聲性能研究對工程應(yīng)用及噪聲控制都有很重要的現(xiàn)實(shí)意義。根據(jù)合理的配比制備了硅酸鹽基多孔吸聲材料,并且通過電子萬能壓力試驗(yàn)機(jī)測試多孔材料的抗壓強(qiáng)度,通過阻抗管法測定多孔材料的吸聲系數(shù),比較了容重對多孔材料吸聲性能的影響。隨著容重增加,材料吸聲系數(shù)下降。分析結(jié)果表明材料在610kg/m3,孔隙率在70%-85%時(shí)材料的力學(xué)性能和吸聲性能表現(xiàn)最佳。分析了影響多孔材料吸聲性能的主要因素。與實(shí)驗(yàn)室阻抗管法測試材料吸聲系數(shù)的方法不同,在LMS Virtual.lab軟件平臺下材料參數(shù)設(shè)置的單一性,數(shù)據(jù)顯示單純改變材料容重并不能很好的調(diào)節(jié)材料的吸聲性能。但協(xié)調(diào)設(shè)置材料參數(shù)之后模擬的吸聲系數(shù)與實(shí)驗(yàn)室測定的材料吸聲系數(shù)吻合度提高,證明在VL平臺下進(jìn)行材料吸聲系數(shù)模擬仿真是可行的。Virtual.lab的模擬結(jié)果顯示,改變材料的孔隙率可以大幅度的改變材料的吸聲性能。具體表現(xiàn)為材料孔隙率越高,則材料吸聲系數(shù)提高得越快,說明孔隙率是影響材料吸聲性能的一個(gè)重要參數(shù)。對于硅酸鹽基多孔材料孔隙率控制70%-85%時(shí)性能最好；改變材料粘性特征長度可以明顯改善材料的吸聲性能,即改變孔洞之間連接的連通性可以控制氣流流過的速度從而影響其吸聲系數(shù),經(jīng)模擬仿真得知,材料粘性特征最佳長度為0.05 mm；材料的流阻率是材料的一個(gè)固有屬性,可以影響到材料的吸聲系數(shù)。但是經(jīng)過實(shí)驗(yàn)數(shù)據(jù)可以看到,并不是空氣流阻率越高則材料的吸聲性能越好,存在一個(gè)最佳范圍,取值在8000-20000 Pa-s/m2時(shí)材料的吸聲性能表現(xiàn)最好。
[Abstract]:Silicate based porous material with wide adaptability and sound absorption performance, good processing, simple preparation process, a sound-absorbing material widely used. The preparation of silicate based porous materials quick harden cement as the main raw materials. The results show that this kind of material in the road barrier, with the effect of the noise absorption good road rail transportation and other fields, to a certain extent, solve the problem of noise increasingly troubled people of life and work. Study on the sound absorption properties of silicate based porous material has very important practical significance to the engineering application and noise control. According to the reasonable ratio of preparation of silicate based porous materials, and the compressive strength of electron universal pressure testing machine of porous materials, determination of the absorption coefficient of porous materials through impedance tube, bulk density of porous sound absorbing performance comparison The effect. With the bulk density increased, decreased the absorption coefficient of materials. Analysis results show that the material in 610kg/m3, the best performance when the porosity of materials in 70%-85% mechanical properties and sound absorption performance. Analyzed the main factors affecting the sound absorption properties of porous materials. Different methods of testing material absorption coefficient and impedance tube in the laboratory, a single set of material parameters LMS Virtual.lab software platform, the data show a simple change material density is not a good regulation of the sound absorption performance of the material. But after setting the coordinate material parameters determination of sound absorption coefficient and absorption coefficient of material laboratory simulation of improving the conformity, proof of the sound absorption coefficient of simulation in VL platform is feasible under the.Virtual.lab simulation results show change, the porosity of the material can greatly change the sound absorption properties of materials. The specific performance of the porosity is high, then The sound absorption coefficient increased faster, that porosity is an important parameter influencing the sound absorbing performance. The best performance for the porosity control of 70%-85% silicate based porous material; changing the material viscous characteristic length can improve the sound absorption properties of materials, namely change the hole connection between the connectivity of the air flow can be controlled through the speed thus affecting its the sound absorption coefficient, by simulation, that the optimum length of material viscosity characteristics of 0.05 mm; the flow resistance ratio of material is an inherent property of materials, the absorption coefficient can affect the material. But through the experimental data can be seen, and not the air flow rate of the higher the better sound absorption properties of materials, the existence of a the best performance, the sound absorption performance of the value of material at 8000-20000 Pa-s/m2 is the best.

【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB383.4

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本文編號：1584506