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.

互联网

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.

互联网

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.

互联网

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.

互联网