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100～160 Hz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=2.0 kV/mm时,在130 Hz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105 Hz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=2.0 kV/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.
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