【摘要】 采用电流变流体(ERF),结合工程实际中常见的隔声腔体结构,通过实验研究了高频声激励作用下含电流变材料夹层圆柱腔体的声振响应特性及其变化。结果表明当外激励为高频信号时,电流变效应的影响仍相当明显,通过对电流变材料施加电场控制,可以对夹层壳形成的封闭腔体的结构振动进行有效的控制。所进行的声振实验结果显示,电流变效应对复合结构的振动在不同的频率段可产生抑制和放大的不同作用,说明在高频激励环境下,电流变复合结构仍具备较强的振动控制能力;同时,腔体外部的声压并未因电流变效应的作用发生明显改变,表明电流变效应对高频噪声没有明显的控制作用。更多还原

【Abstract】 With the combination of electrorheological fluid and a sandwich cylindrical cavity, the dynamic and acoustic characteristics, as well as the change of the structural responses, of a sandwich structure while being excited by high frequency noise inside are studied experimentally in this paper. The experimental results show that by means of controlling ER material with external electric field, the vibration of the composite cylindrical structure could be affected apparently while the excitation is of high frequency. The experimental results show that ER effect could make different influence on structural vibration in different frequency range, and ER based composite structure could still be used for adaptive vibration control in high frequency range; in the meantime, it is found that there is no apparent change in the sound pressure outside the cavity, which means that ER effect has no apparent influence on sound isolation performance of the structure and noise control in high frequency range.更多还原