【作者】 鲁宏权； 孟光；

【Author】 LU Hong-quan, MENG Guang(The state key laboratory of vibration, shock and noise, Shanghai Jiao long University, Shanghai, 200030)

【机构】 上海交通大学振动、冲击、噪声国家重点实验室；

【摘要】 作为一种新型智能作动材料,电流变液在振动和噪声控制方面具有很多优于传统阻尼材料的特性。文中通过分别进行的充注电流变材料的夹层板结构的动力特性试验,夹层圆柱壳结构在声激励下的隔声性能测试及相应的壳体结构动力响应测试研究了电流变材料在受控条件下对结构振动和噪声控制的影响。实验结果表明:施加电场后的电流变材料表现出较为明显的刚度和阻尼变化,可以导致结构动力特性的显著变化,并对结构的动力响应产生较大影响,说明电流变材料对结构振动有较强的控制作用。对于试验中的噪声声波,电流变夹层结构在施加电场前后并未产生明显的控制效果,说明在这种情况下,电流变材料对噪声的控制作用要远弱于其对振动的控制。实验研究中发现,由于电流变材料自身性能的频率相关性,使得其对结构振动和噪声控制的作用也随着外激励频率而发生变化,虽然在大多数情况下这种控制效果显示为对振动或噪声的抑制作用,但在某些情况下也会出现引起结构振动或噪声放大的效果。更多还原

【Abstract】 As one kind of intelligent material, elecrtrorheological fluid shows many superior characteristics in vibration and noise control when being compared with those traditional damping materials. With a dynamic experiment on a sandwich plate filled with ERF, a sound isolation test and a dynamic response experiment on a sandwich cylindrical shell filled with ERF, the effects of electrorheological fluid on the vibration and noise control of sandwich structures are studied in this paper. It is shown that the stiffness and the damping of the ER materials will be changed apparently when the electrical field is applied. The experimental results show that the ER material under control can adjust and control the structures’ vibration obviously. But to the structure under the condition of sound excitation, the ERF has no obvious effects on sound isolation and noise control. It is also found that both the effects of the ERF on vibration and noise control are varying with the exciting frequency. Though in most cases the ERF under electrical fields can restrain the structural vibration and noise, it can also amplify the vibration and noise in some cases.更多还原