中文摘要：

对夹于两柔性电极间的淀粉硅油电流变液进行了声波透射实验研究。结果表明：电流变液的声波透射有较强的频率选择性。淀粉体积分数为31％时，在100～160Hz频率范围内，随电场强度E增加，相对透射率T出现增强峰，其它频率段T基本不随E变化。当E=2．0kV／mm时，在130Hz处透射峰的相对透射率约为零电场时的7倍。透射波相位随E增大，入射波频率为105Hz时，李萨如图椭圆主轴随E增加顺时针转动45°。电场强度加大，增强峰的幅值和相位表现出可调节的特征。随颗粒体积分数从16％增大到31％，电流变液中声波最大相对透射率（E=2．0kV／mm）从1．8变为7，增强峰的响应频带向高频移动。分析认为，电流变液中场致微结构与声波的相互作用可能是出现这些现象的原因。

英文摘要：

The sound transmission behaviors through a thin electrorheological （ER） layer sandwiched between two sheets of flexible electrodes were investigated experimentally. The transmission spectrum of the ER layer shows frequency selective characters. The relative transmittance T of the ER layer with a particle volume fraction of 31% exhibits an enhanced hump within 100-160 Hz with the increase of the external electric field E, while T doesn＇t change with E at other frequencies. The relative transmittance T at the hump peak of 130 Hz under E=2.0 kV/mm is nearly 7 times that of zero electric field strength. The phase angle of transmitted sound increases with E also. At the frequency of 105 Hz, the long axis of Lisajous ellipse figure rotates clockwise by 45° as E increases from 0 to 2.0 kV/mm. With the increase in E, the amplitude and phase of the transmission hump show tunable features. As φ increases from 16% to 31%, the maximum T changes from 1. 8 to 7 （E=2. 0 kV/mm） and the responding frequency band of the enhanced hump moves towards the high frequency direction. The interaction between the field induced microstructures and the sound waves may be the cause of the phenomenon.