摘要
交流滤波电容器装置噪声极大,对周边居民造成严重噪声污染,为有效降低其噪声,需要构造一种多层复合降噪隔声罩,为了同时有效提高材料的吸声性能和隔声性能,该文设计一种聚氨酯、生物质电厂灰及膨胀珍珠岩复合降噪层,作为构造电容器降噪材料的吸声层。实验以材料的吸声系数和隔声量为2个考察指标,通过正交实验及极差分析得到性能最优的材料配比为聚氨酯软硬段比5∶5,生物质灰的添加量为20%,珍珠岩的添加量为5%,并对其吸隔声性能进行了验证,结果显示最优配比下材料的吸声系数为0.51,隔声量可达12.3 d B(A),对于电容器特征噪声频率段的降噪效果明显,可以作为电容器降噪隔声罩的吸声层使用。
This paper presented a sound insulation cover made of multi-layer composite to deal with severe noise of capacitors used in HVDC（high voltage direct current） transmission,the composite was comprised of polyurethane（two different sorts：hard and soft）,perlite and biomass ash,and to determine the optimal materials mixture ratio experiments were conducted that focused on two parameters：acoustic absorption coefficient and sound attenuation. Thus,orthogonal tests and orthogonal polar difference analysis were performed,and the result showed the optimal mixture ratio of materials was the ratio of soft polyurethane to hard polyurethane as 5：5,with the additions of perlite 5%,biomass ash 20%;accordingly,the acoustic absorption coefficient of the optimal composite sample reached 0.51,and the sound attenuation value up to 12.3 d B（A）. As a result,it proved that the effectiveness was adequate for noise reduction of capacitor in HVDC in terms of its special noise frequency.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2016年第12期154-157,共4页
Environmental Science & Technology
基金
中央高校基本科研业务费专项资金(2042014kf0233)
国家科技支撑计划课题(2015BAB01B03)
关键词
聚氨酯
降噪材料
珍珠岩
生物质灰
polyurethane
noise reduction materials
perlite
ash of biomass
