摘要
不同于以往的理论、经验设计,采用低频段的声固耦合法、中高频段的统计能量法(SEA)对设计的混响声场进行声学分析,提高混响水平。根据虚拟结果建立混响箱实物,置于半消声室内进行测试,混响箱结构本体的噪声衰减量超过50 dB,混响时间达到混响要求,混响场内不同位置声压值差距均小于2 dB,该混响箱设计满足混响声场的要求;将SEA法隔声计算结果与应用混响箱-消声室法对板件的隔声测试结果进行对比,两者吻合良好;因此该实验方法能实现很好的隔声效果。通过该方法可快速对单层板及夹层板件进行隔声测试,发现吻合频率效应对隔声性能影响较大;以上研究对工程应用有较大的参考意义。
Different from the theoretical and empirical design,a structure sound coupling method of low frequency and a SEA method of mid-high frequency were used to analyze the reverberant sound field to increase the reverberation level.The reverberant chamber was designed and made based on virtual result.The entity was placed into the anechoic room to be tested,which shows that the reverberation time meets the request and the SPL in different positions of the sound field only has gap within 2 dB between each other.The STL result of the SEA method for panel was compared with the test result by using the reverberation chamber-anechoic room method,which shows good agreement.The experiment method thus can realize great STL effect.By using this method to test sound insulation of single layer panel and sandwich panel rapidly,it was found that coincidence frequency effect has a significant impact on STL performance.The above findings offer meaningful reference to the engineering application.
作者
张磊
郑旭
陈军
郝志勇
ZHANG Lei;ZHENG Xu;CHEN Jun;HAO Zhiyong(College of Energy Engineering,Zhejiang University,Hangzhou 310027,China;Wanxiang Group,Hangzhou 311215,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2020年第8期258-263,270,共7页
Journal of Vibration and Shock
基金
国家自然科学基金(51705454)
国家重点研发计划项目(2016YFB0101604)。
关键词
统计能量法(SEA)
声固耦合
混响声场
混响箱-消声室
隔声(STL)
夹层板
statistical energy analysis(SEA)
structural-acoustic coupling
reverberant field
reverberation chamber-anechoic room
sound transmission loss(STL)
sandwich panel
