Development of multi-functional minute ER device with liquid ciystal and suspension type ER fluid

液态、悬浮型ER液多功能微型ER装置的开发

• 批准号: 10555059
• 负责人: HASEGAWA Tomiichi
• 金额: $ 4.8万
• 依托单位: NIIGATA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10555059/
• 关键词: Functional fluid; Liquid Crystal; Suspesion type ER fluid; ER Effect; Flow Control; Electro Rheology; ER流体; マイクロ流体力学

Following two points have been investigated for the development of multi-functional minute ER device.First, in order to obtain a referential data for the flow or motion control of the device without an extra device such as a load-cell, we have tried to modify an ER device of liquid crystal to have a sensing function of the flow rate. Image analysis is applied to the flow of liquid crystal in an ER channels with stripe-patterned electrode and polarizers. We have found some parameters obtained with the analysis of change in brightness profile generated with the stripe pattern under electric fields are useful to evaluate flow rate. For example, a parameter obtained with digital Fourier transfer analysis of the brightness profile, amplitude or average in brightness have good relationships with shear rate (flow rate). The evaluation error is about 3% and we conclude this method is useful for the practical applications.Second, an ER conversing channel for a suspension type ER fluid has been tested to obtain enough ER effect even in a minute device. Moreover, an ER channel of liquid crystal was*coupled with that of suspension type to obtain an ER that is useful for a wide flow rate range. We have clarify that ER effect ofa suspension type ER fluid is improved in a conversing channel and the high ER effect is caused with a particle layers generated on the electrodes. We also obtained both a valve effect and improved high shear rate ER effect are obtained by a coupling of liquid crystal ER channel with that of suspension type.

本文对多功能微小电流变器件的研制进行了以下两个方面的研究：首先，为了在不增加称重传感器等额外器件的情况下，为器件的流量或运动控制提供参考数据，我们尝试对液晶电流变器件进行了改造，使其具有流量传感功能。用图像分析方法研究了带有条纹电极和偏振器的电流变通道中液晶的流动。我们发现，通过分析电场作用下条纹图案产生的亮度分布的变化，得到的一些参数对估算流量是有用的。例如，通过对亮度分布、幅度或平均亮度进行数字傅里叶变换分析而获得的参数与剪切速率(流量)具有良好的关系。其次，对悬浮式电流变液的电流变通道进行了测试，获得了足够的电流变效果。此外，将液晶的电流变通道与悬浮型的电流变通道相耦合，得到了适用于宽流速范围的电流变通道。阐明了悬浮型电流变液的电流变效应是在换向通道中得到改善的，高电流变效应是由电极上产生的颗粒层引起的。通过液晶电流变通道与悬浮型电流变通道的耦合，我们还获得了阀门效应和改进的高剪切速率电流变效应。

项目成果

K Iwatani, T. Narumi, K Sugahara, T. Hasegawa and R. Igarashi: "Electrorheological Effect of Liquid Crystal in Micro- Gaps"Proc. JSME 2000 Annual Meeting. Vol. 4. 227-278 (2000)

K Iwatani、T. Narumi、K Sugahara、T. Hasekawa 和 R. Igarashi：“微间隙中液晶的电流变效应”Proc。

T. Watanabe, T. Narumi and T. Hasegawa: "Particle Behavior of Suspension Type ER Fluid in Minute Channels"Proc. SRJ 48th Rheology Conference. 135-136 (2000)

T. Watanabe、T. Narumi 和 T. Hasekawa：“微小通道中悬浮型 ER 流体的颗粒行为”Proc。

T.Narumi,T.Hasegawa,et.al.: "Rheological Characteristics of Liquid Crystals in Narrow Gaps under Electric Fields" Proc.of 8th National Conference on Rheology,Australia. 169-172 (1998)

T.Narumi，T.Hasekawa，等：“电场下窄间隙液晶的流变特性”，澳大利亚第八届全国流变学会议论文集。

岩谷圭太郎,鳴海敬倫,長谷川富市,菅原圭一,五十嵐隆治: "ミクロンオーダーのすきま内での液晶のER効果"日本機械学会2000年度年次大会講演論文集. Vol.4. 277-278 (2000)

Keitaro Iwaya，Takatomo Narumi，Tomiichi Hasekawa，Keiichi Sugarashi，Ryuji Igarashi：“微米级间隙内液晶的ER效应”日本机械工程师学会2000年年会论文集4。277-。 278 (2000)

T.Narunri: "Converging and Diverging Flow of Electrorheological Fluid in Minute Channels"International Journal of Modern Physics B. Vol.15,Nos.6&7. 723-730 (2001)

T.Narunri：“电流变流体在微小通道中的收敛和发散流”国际现代物理学杂志 B. 第 15 卷，第 6 期