The airflow noise attenuation capacity of the increasing thickness , decreasing pore diameter increasing airflow velocity.
材料厚度越大 、 孔径越小、气流速度越大,多孔铝合金的防风降噪性能越好.
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The noise attenuation characteristics of air cleaner in a passenger car are analyzed using element method.
以某型轿车空气滤清器为研究对象,使用有限元法计算并分析其消声特性.
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In the end, we also talk about the development trend of techniques for noise attenuation.
最后还简述了去噪技术的应用及发展情况.
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However, no report is available about the effects of tree parameters on noise attenuation of expressway.
然而, 针对高速公路绿化带种植树种、种植密度、林带宽度等多种因素对降噪效果影响的研究尚属空白.
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