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1、第36卷第5期噪声与振动控制Vol36No.52016年10月NOISEANDVIBRATIONCONTROLOct.2016文章编号：1006-1355(2016)05-0075-07空滤器声学特性及进气口噪声声品质试验1121李恒，郑旭，刘联鋆，甘庆良（1.浙江大学能源工程学院，杭州310027；2.上海思百吉仪器系统有限公司Brüel&Kjær部门，上海200125）摘要：为研究空滤器总成的声学特性，在半消声室内通过静态实验测试系统的消声量、传递损失，并进行发动机台架试验，评估进气口噪声水平及声品质特性。首先，实验测试获得空滤器壳体
2、的声学特性，并与有限元仿真计算结果相对比，验证实验值的准确性。其次，分别研究空滤器壳体、滤芯材料的消声量、传递损失，发现滤芯结构的存在，在中高频尤其是500Hz以上大大提升空滤器的消声性能，而对中低频影响微小。再者，搭建发动机台架进行试验，对比分析安装空滤器总成前后进气口噪声的声压级水平。先后进行稳态工况、加速工况试验，发现空滤器总成几乎在全频段内对进气噪声均有明显的降噪功能。最后，提取稳态工况进气口声压频谱，编程处理数据，分析进气口噪声声品质水平，研究空滤器总成对进气口响度、尖锐度的影响。为进一步研究并提高发动机进气口噪声声品质提供基础
3、与指导。关键词：声学；空滤器；滤芯；消声量；传递损失；声品质；台架试验中图分类号：TK417+.125文献标志码：ADOI编码：10.3969/j.issn.1006-1335.2016.05.016TestsofAcousticPerformanceofAir-filtersandSoundQualityofIntakeNoise1121LIHeng,ZHENGXu,LIULian-yun,GANQing-liang(1.CollegeofEnergyEngineering,ZhejiangUniversity,Hangzhou3100
4、27,China;2.Brüel&KjærDept.SpectrisInstrumentation&SystemShanghaiCo.Ltd.,Shanghai200125,China)Abstract:Inordertoinvestigatetheacousticperformanceoftheair-filterassembly,thestaticnoisereductionandtransmissionlossaremeasuredinasemi-anechoicroom.Furthermore,theenginebenchtest
5、iscarriedout.Accordingly,thesoundpressurelevelandthesoundqualityoftheintakenoiseareevaluated.Firstofall,theacousticperformanceoftheair-filterismeasuredandtheresultsareverifiedthoughthefiniteelementsimulation.Then,thenoisereductionandthetransmissionlossoftheair-filterareob
6、tainedandanalyzedthoughthetestswith/withoutfilterelementinside.Theresultsindicatethatthefilterelementperformswellinnoiseattenuationinthefrequencyrangeabove500Hz,butdoesnotsowellinthemiddle-and-lowfrequencyrange.Subsequently,theenginebenchtestisconductedundertheconditionof
7、steadystateandacceleratingstate.Itisfoundthattheair-filterwiththefilterelementinsidehasgoodintakenoiseattenuationeffectalmostinthewholefrequencyrange.Finally,theintakesoundpressurefrequencyspectrumisacquiredinthesteadystateoperationconditionandthesoundqualityisanalyzed.In
8、addition,theinfluenceoftheair-filterassemblyontheloudnessandsharpnessoftheintakenoiseareanalyzed
