The effect of a time-dependent electric field on the dynamic performance of an electrorheological fluid in squeeze
The effect of a time-dependent electric field on the dynamic performance of an electrorheological fluid in squeeze
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DOI：
10.1088/0022-3727/33/22/319
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发表时间：
2000-11
期刊：
影响因子：
--
通讯作者：
A. K. E. Wahed;J. Sproston;E. Williams
中科院分区：
文献类型：
--
作者：
A. K. E. Wahed;J. Sproston;E. Williams
研究了交流电场在不同机电条件下对振荡挤压流动中电流变流体性能的影响。流体被夹在两个平行的圆形电极之间，上面的电极固定，下面的电极被迫与自己的平面垂直正弦振荡。它显示了在直流和低频交流电场下，通过流体传递的力如何更大。此外，流体的流变性能高度依赖于输入电波形的形状，其中方波产生最佳的工作响应。结果表明，在动态压缩-拉伸加载下，流体的链状结构被破坏，而在高频率下，它没有时间重新形成。此外，在正弦场的激励下，流体的性能与假设双粘性流体特性的理论模型所预测的性能非常吻合。最后，强调了结果对振动控制的影响，其中电流变换器流体用于短冲程挤压装置。
An investigation was carried out into the effect of an ac electric field on the performance of an electrorheological (ER) fluid in oscillatory squeeze flow under various mechanical and electrical conditions. The fluid was sandwiched between two parallel circular electrodes, the upper one fixed and the lower one forced to oscillate sinusoidally normal to its own plane. It is shown how the force transmitted across the fluid is greater with dc and low-frequency ac electric fields. Furthermore, it was seen that the rheological performance of the fluid is highly dependent on the shape of the input electrical waveform, with a square wave producing the optimum working response. The results suggest that under dynamic compressive-tensile loading, the chain structure of the fluid is destroyed and at high electrical frequencies, it does not have time to reform. In addition, the performance of the fluid when energized by a sinusoidal field compares very well with that predicted by a theoretical model which assumes a bi-viscous fluid characteristic. Finally, the implications of the results to vibration control, where the ER fluid is employed in a short-stroke squeeze device, are highlighted.