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分析了中空微球填充聚合物复合材料的隔声机理,由此建立了中空微球填充聚合物复合材料的隔声模型并推导出相应的隔声量方程,同时预测了中空玻璃微球(HGB)填充聚丙烯(PP/HGB)复合材料的隔声量,并将其与实测数据进行了比较。结果表明:PP/HGB复合材料的隔声量随着声波频率的增加而增大,其中当频率较低时,复合材料的隔声特性对频率的敏感性较强;PP/HGB复合材料的隔声量与HGB的体积分数成线性关系;随着声波频率或HGB体积分数的增加,隔声量的理论预测值与实测数据具有大致相同的变化趋势。 相似文献
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本文对轨道交通车辆安装复合材料头罩的驾驶室进行隔声研究,先从双层纤维增强树脂基夹芯复合材料对称结构和非对称结构的隔声性能进行研究,再对三层纤维增强树脂基夹芯复合材料结构的隔声性能进行探究,接着进一步探究阻尼材料、隔声材料对纤维增强树脂基夹芯复合材料隔声性能的影响,最后根据驾驶室的实际情况,探究空气层和内饰件产品对驾驶室隔声性能的影响。结果表明,对于双层纤维增强树脂基夹芯复合材料结构,在声源侧分配厚的纤维层,比平均分配两侧纤维层可获得更高的隔声性能;对于三层纤维增强树脂基夹芯复合材料结构,将厚度最大的纤维层置于近声源端,将厚度次之的纤维层置于远声端,将厚度最小的纤维层置于中间的结构,其隔声量明显优于双层纤维增强树脂基夹芯复合材料结构;在复合材料背面增加阻尼材料或隔声材料都可提高其隔声性能;考虑内饰件及空气层时,驾驶室的隔声量可提高。 相似文献
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《塑料工业》2021,(6)
向极性聚氯乙烯(PVC)基体中引入改性氧化石墨烯(GO),通过溶液法采用聚甲基丙烯酸甲酯(PMMA)改善了GO在基体中的分散性,利用材料结构对声波的吸收和反射,制备了氧化石墨烯/聚氯乙烯层状复合材料。研究了GO的含量及层状结构对聚氯乙烯基复合材料隔声性能的影响。结果表明,改性的氧化石墨烯增加了体系的模量和动态力学性能,层状结构具有多种声学性能,能有效提升体系的隔声性能。当GO质量分数为1.5%时,GO/PVC复合材料在2 000 Hz处隔声量可达51.52 dB,在1 000~6 300 Hz范围内平均隔声量为39.33 dB,而GO/PVC层状复合材料在1 120 Hz处隔声量可达56.55 dB,在1 000~6 300 Hz范围内平均隔声量为45.15 dB。 相似文献
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以单层墙体作为研究对象,采用SEA法研究墙体隔声中吻合效应的特征,探索减弱吻合效应的方法。研究结果显示,用SEA法计算的隔声频率曲线比质量定律的计算值更接近于实测值,且能够清晰地反映出吻合效应的特点及规律。本文还根据SEA法的预测结果对墙体构件的材料选择进行了探讨,结果表明,当隔声对象处在可发生吻合效应的频率范围内时,增加墙体面密度不会提高隔声性能,此时使用临界频率更高或更低的材料才能增大隔声量。 相似文献
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将蛭石填充到钢渣粉改性过的苯乙烯-乙烯-丁二烯-苯乙烯(SEBS)/钢渣粉基体中,用模压法制备不同配比、不同目数和不同面密度的SEBS/钢渣粉/蛭石复合材料。利用双通道声学分析仪,研究了其隔声性能;利用扫描电子显微镜(SEM)、万能材料试验机等研究了材料的微观结构、拉伸力学性能等。结果表明,经钢渣粉改性的SEBS与蛭石相容性较好,制作出的复合材料隔声性能优于基体材料;在相近面密度条件下,蛭石含量的变化对隔声性能的影响主要在声频1 600 Hz的区域;蛭石目数的变化对复合材料隔声性能影响不大;复合材料的隔声量随着材料面密度的增大而增大,主要体现在声频段200~1 600 Hz。 相似文献
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《硅酸盐学报》2016,(10)
提出一种局域共振二维声子晶体模型,将局域共振机理与气体泵动阻尼技术相结合,研究了该技术对模型带隙及隔声量的影响;增加振子数目情况下,分析了多振子模型对带隙拓宽的效果。通过改变4振子模型的材料组分,打破模型的对称性,研究了对称性对模型带隙及隔声量的影响。结果表明:气体泵动阻尼技术的引入可以有效提升模型的隔声量;多振子模型在拓宽带隙的同时可以有效改善隔声效果,其中4振子模型隔声效果最佳;通过改变材料组分打破模型的对称性,可以增加振子的谐振频率,改善某些频率处的隔声效果,同时其质量降低为原模型的66.9%。这一结果可以为声子晶体的实际工程应用提供一定的理论参考。 相似文献
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The effects of dioctyl phthalate and inorganic filler, mica, on the sound insulation property of poly(vinyl chloride) (PVC) were investigated in this work. The stiffness and mass laws, which are the common theoretic tools to predict the soundproof properties of materials, were used to analyze the sound transmission loss (STL). The experimental results revealed that the stiffness and mass laws can describe well the sound insulation property of PVC/mica composites. The stiffness and surface density are important factors influencing the improvement of STL. With the increase of content of mica, STL and resonance frequency, fmn, of PVC/mica composites increase. Moreover, the change of STL in the stiffness‐ controlled region is more obvious than that in the mass‐controlled region, because the addition of mica in PVC leads to a greater increase in the stiffness. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011 相似文献
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High-damping acoustic composites with unique sound insulation feature is reported, demonstrating surprisingly stable soundproof properties over a wide bandwidth of frequency (63–6300 Hz) with good mechanical properties. The extraordinary acoustic properties are attributed to the multiscale synergy of lamellar and hollow structures by multifillers adding. The acoustic composites are designed and fabricated through a low-temperature one-time rubber mixing process using nitrile butadiene rubber(NBR), chloroprene rubber (CR) as matrix and mica powder (MP), hollow glass beads (HGB), and montmorillonite (MMT) as multifillers. The soundproof mechanism is discussed in detail. Results indicate that the synergism of damping and sound absorption behaviors in the composition has a considerable impact on the acoustic characteristics, which can be controlled by the blending ratio of NBR/CR matrixes and the multiscale structures of MP/HGB/MMT multifillers. The designed multifillers acoustic composites can adapt to broadband engineering noise control including walls in express train constructions, panels of vessel or aircraft cabins, and large transportation pipelines. 相似文献
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聚合物基复合材料隔声性能的研究 总被引:7,自引:0,他引:7
分析了无机粒子填充聚合物复合材料的隔声原理,指出其隔声效果的改善可归因于粒子使声波多次折射、散射和绕射导致传播路径增加,以及粘弹性的改变令声能消耗增大。测试了几种聚合物基复合材料的隔声性能,结果表明,隔声效果服从质量定律,且含中空粒子的复合材料具有更优越的隔声性能。 相似文献
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Zhijia Zhang Hao Jiang Rui Li Shan Gao Qiang Wang Guojun Wang Xiao Ouyang Hao Wei 《应用聚合物科学杂志》2021,138(10):49970
The high-damping property of polyurethane elastomers and the low density of the hollow glass microspheres (HGM) were used to prepare the sound insulation materials in the present work. The transmission loss (TL) was measured to evaluate the HGM content on the sound insulation properties. The experimental results showed that the addition of HGM improved the hardness and compression modulus of the HGM-filled polyurethane composites, and the loss factor (tan δ) of polyurethane composites were greater than 0.9. The average transmission loss (ATL, from 63 to 6300 Hz) reached 37.32 dB when the content of HGM was 10 wt%. The ATL of the HGM-filled polyurethane composites with 15 wt% HGM in the damping control region and the mass control region were 31.94 and 46.78 dB, respectively. The synergistic effect of the microphase separation, the interfacial effect and the rigidity of polyurethane composites resulted in the improvement on sound insulation property. The polyurethane composite has a great potential application for the field of sound insulation materials. 相似文献
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LDPE/石墨复合材料导热系数模拟与实测值的比较 总被引:2,自引:0,他引:2
应用ANSYS的参数化有限元分析技术,建立了无机粒子填充聚合物复合材料的导热模型,模拟了石墨填充低密度聚乙烯(LDPE)复合材料的传热过程。在此基础上,模拟了LDPE/石墨复合材料的导热系数,并与文献报道的实测数据进行比较。结果表明,两者之间有较好的一致性。 相似文献
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Tianmiao Yu Fengchun Jiang Xu Cui Mengxin Cao Chunhuan Guo Zhenqiang Wang Yunpeng Chang 《应用聚合物科学杂志》2021,138(8):49891
In this article, 316L stainless steel hollow spheres (316L HS) and polyurethane (PU) resins were used to prepare a novel metallic-hollow-sphere/polyurethane (MHSP) acoustic composite by casting. The acoustic experimental results of this composite revealed that compared to monolithic PU, the sound transmission loss of the composites increased and the maximum sound absorption peak shifted to lower frequency with the change of acoustic impedance and resonance frequency. When the surface of metallic hollow sphere used in MHSP composite was modified by silane coupling agent, the sound insulation and sound absorption performance of MHSP composites were further improved. This is related to the addition of the molecular layer of coupling agent between MHSP matrix. In addition, the addition of silane coupling agent creates PU foaming in matrix, resulting in a large number of pores and gaps that can increase the sound waves energy loss through air friction and heat exchange. 相似文献
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通过实验和数值模拟方法研究了空心玻璃微球/环氧树脂复合材料隔热性能。首先使用ANSYS/APDL建立代表性体积单元,探讨了模拟过程中模型尺寸、填料体积分数、填料平均粒径及基体与填料导热系数之比(λ_m/λ_p,λ_m保持不变)对复合材料导热系数的影响。数值研究结果表明:当代表性体积单元尺寸大于500μm时,模型尺寸对复合材料导热系数的计算结果影响较小;复合材料导热系数随填料体积分数和λ_m/λ_p的增大而减小,且基本不受填料粒径影响。其次,将复合材料导热系数实验值和计算结果进行对比,比较发现导热系数计算结果和实验值及Agari模型理论值吻合较好,证明了计算方法的可靠性。同时,空心玻璃微球的掺入有效地降低了树脂的密度。轻质隔热的空心玻璃微球/环氧树脂复合材料有潜力成为一种具有广泛应用前景的节能环保材料。 相似文献