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通过实测的水泥路面与沥青混凝土路面噪声的对比,以及低噪音路面与水泥路面的吸声系数的对比,并结合各个路面的综合性能,分析了隧道内路面结构的选择,并且指出SMA路面结构更适合隧道路面。 相似文献
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为解决城市特长隧道通行空间噪声水平高、驾乘人员通行体验差及多孔沥青混合料路面易堵塞的问题,提出采用双层多孔沥青路面结构,优化了小粒径多孔沥青混合料的级配,同时研究了多孔沥青混合料的路用性能、吸声降噪性能及抗阻塞性能,并铺设了试验路验证其效果。结果表明,在常规筛网基础上增加6.7 mm筛网可有效控制小粒径多孔沥青混合料级配分布,便于形成良好的骨架;同时综合考虑路用性能与降噪性能,确定了沥青混合料空隙率为18%;此外,双层多孔沥青路面在防堵塞方面明显优于单层多孔沥青路面,试验路降噪效果明显,验证了该路面结构的有效性及相关设计参数选择的合理性,可为同类工程的修建提供借鉴与参考。 相似文献
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通过配制高黏度改性沥青,研究大空隙率沥青混合料的配合比,制备了降噪沥青混合料.经过试验研究,降噪沥青混合料的高温稳定性、低温抗裂性、水稳定性等路用性能都能达到技术要求;采用驻波管法测试了降噪沥青混合料的吸声性能,结果表明,降噪沥青混合料的吸声性能良好;降噪沥青路面具有良好的降噪效果;采用降噪沥青混合料表层的路面结构能够满足强度要求. 相似文献
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对公路隧道水泥混凝土路面抗滑与降噪功能进行了系统调查与分析,并对隧道水泥混凝土路面等抗滑降噪施工工艺展开了深入研究,以此达到降低噪声,提高路面抗滑性能的目的。 相似文献
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本文主要探讨微穿孔板吸声机理、吸声系数与频率的关系,以及在室内的吸声处理,降低噪声、消声等方面的应用。并指出微穿孔板吸声结构的吸声性能优于其它矿棉吸声材料,能够较好地改善建筑声学功能,可广泛应用于吸声降噪工程,效果理想。 相似文献
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微穿孔板吸声结构的机理及应用探讨 总被引:3,自引:0,他引:3
本文主要探讨微穿孔板吸声机理、吸声系数与频率的关系,以及在室内的吸声处理,降低噪声、消声等方面的应用。并指出微穿孔板吸声结构的吸声性能优于其它矿棉吸声材料,能够较好地改善建筑声学功能,可广泛应用于吸声降噪工程,效果理想。 相似文献
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通过双层蜂窝板和面穿孔装饰纤维板的组合,制备出具有宽频域和高吸声性能的复合构造木质吸声板,对其进行正交试验.结果表明:对复合构造木质吸声板吸声性能有显著影响的结构因素为后层蜂窝夹芯深度和前层蜂窝夹芯深度,而面板的穿孔直径和穿孔率影响不显著.较佳工艺参数下复合构造木质吸声板的降噪系数为60.17%,在250,500,1000,2000 Hz的吸声率分别达到24%,60%,70%,90%;与穿孔板和单层蜂窝夹芯板相比,其吸声频带范围明显增大,吸声性能显著提高. 相似文献
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M. Frías J.M. Jiménez-Mateos J. Pfretzschner J. Olmeda R.M. Rodríguez M.I. Sánchez de Rojas 《Construction and Building Materials》2011,25(2):1086-1092
Noise is becoming one of most important pollutants, especially in towns. Indeed, the European Community recognizes the environmental noise as one of the most important environmental problems in Europe. Therefore, there are real demands, increasing in the near future, of acoustic absorbent materials. Taking into account the conditions that these materials must present (durability, costs, noise absorption power, etc.), a new material based on petroleum coke agglomerated with cement has been developed, targeted as base for designing and construction of noise screens. Our results showed that the petroleum coke–cement system had suitable acoustic properties. Therefore, the usage of petroleum coke as acoustic absorbent material opens a new alternative, with important advantages from social and environmental viewpoints. Due to high porosity of this composite the mechanical strengths decreased with increasing coke content. 相似文献
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The study investigated differences in worker satisfaction and perceived job performance regarding privacy, interaction, and acoustic quality issues in personal workspaces between five office types in LEED-certified buildings. It finds that people in high cubicles showed significantly lower satisfaction and job performance in relation to visual privacy and interaction with co-workers than both enclosed private and enclosed shared office types. They also showed significantly lower satisfaction with noise level and sound privacy and lower job performance perceived by acoustic quality than enclosed private, enclosed shared, and bullpen types. The bullpen type, open-plan office without partitions, presented significantly higher satisfaction with noise level and higher performance perceived by acoustic quality than both high and low cubicles. Considering the bullpen type also showed higher satisfaction with sound privacy than the high cubicle type, high partitions don't seem to contribute to creating workspaces where people can have a secure conversation. The bullpen type didn't show any difference from the enclosed shared type in all privacy, interaction, and acoustic quality questions, indicating it may be a good option for a small office space instead of the enclosed shared type. 相似文献
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针对广东科学中心科技影院吸音工程的难点,详细介绍了材料的选择及施工管理的重点,以及确保影院减振吸音效果的相关技术措施,为同类工程施工管理提供了参考。 相似文献
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New results on sound insulation of facades and external building components. In spite of the strong annoyance by noise, the acoustic quality of external building components is often regarded as requirement of secondary importance. However, a high standard of noise protection is expected by most of the occupants or owners of buildings as the evaluation of numerous complaints in acoustically inadequate buildings shows. The main problem is the poor sound insulation performance of external walls against low frequencies, e.g. caused by traffic noise. Therefore, acoustic improvements have to focus on that topic. Fortunately, an extended range of data, knowledge and solutions is provided within the state of the art. With regard to the acoustic quality of external thermal insulation systems and of hollow bricks the results of recently completed research projects are presented in the paper. 相似文献
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本文针对小型音乐厅的建筑声学设计的重要性,重点围绕混响时间设计、体形设计、吸声材料的设计、噪声控制设计等几个方面,对小型音乐厅建筑声学设计进行了详细分析,以期对提升小型音乐厅的声学设计质量有所借鉴。 相似文献
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为了在设计阶段实现基于设计参数的多孔沥青混合料吸声性能预估,构建了基于微观结构的多孔沥青混合料吸声模型.依据声-电类比理论,计算了多孔沥青混合料吸声模型的声阻抗和吸声系数;运用图像处理技术及统计分析方法,得到了多孔沥青混合料"特征孔隙直径";依据多孔沥青混合料吸声模型微单元体中毛细管长度随圆球与毛细管截面直径比值的变化规律,得到了微单元体中毛细管的结构参数取值.结果表明:所构建的多孔沥青混合料吸声模型预测的给定声波频率下试件最大吸声系数及其对应频率与驻波管法实测值之间具有良好的相关性,验证了该模型在预测多孔沥青混合料吸声特性方面的准确性. 相似文献