用于盲文显示的电流变阀门关键参数分析

中国是世界上盲人人数最多的国家,长期以来缺少一款可以供盲人自主学习的面阵电子阅读器。电流变液微阀门控制的盲文凸点显示矩阵具有能耗少、易于控制等优势,为盲文面阵电子阅读器提供了可能。电流变液微阀门作为盲文显示器的重要组成部分,正确显示盲文取决于ER阀门工作的稳定性,不同的阀门参数对应着不同的工作点,影响阀门的稳定性;盲文凸点的刷新速率,取决于同一给定压力下各个阀门的输出流量,不同的阀门间隙对应着不同的阀门阻力,影响着盲文凸点的刷新速率。文中在建立ER阀门数学模型的基础上分析了电流变微阀门结构参数对阀门稳定性及传输流量的影响规律,为此类应用的微阀门设计提供技术支撑。

Simulation analysis and parameters determination of electrorheological valve for Braille display

China has the largest visually impaired group around the world. There is a lack of an e-reader for blind people to learn independently. Using electrorheological(ER) fluid micro valves to manipulate Braille dots matrix has the merit of easy control with low energy consumption. The ER fluid micro valve is an important part of the Braille display. The correct display of Braille depends on the stability of the ER valve. Different valve parameters make different operating points and affect the stability of the valve. The refresh rate of the braille dots depends on the output flow of each valve under the same given pressure, and different valve gaps make different valve voltages, which affects the refresh rate of the braille dots. In this paper, based on the established mathematical model of the ER valve, the influence of the structure parameters of the ER micro valves on the stability of the valve and the transmission flow is analyzed, which provides technical support for the design of the micro valve for such applications.