【作者】 李阳；

【导师】 黄宜坚；

【作者基本信息】 华侨大学 ， 机械制造及其自动化， 2005， 硕士

【摘要】 电流变技术是一门崭新的机电液一体化技术,基于电流变液的电控特性,该技术有可能给某些传统技术带来革命性变化。其技术的优势表现在:装置结构更简单,响应更迅速,控制更方便,并具有某种智能特性。近年来,随着研究的不断深入和突破,该技术正越来越引起国内外科学家和工程师们的广泛关注。 众所周知,制约电流变技术在传动和制动方面应用的关键问题是:由于电流变材料较低的场致应力,电流变装置产生的传动力矩还不能满足工程应用要求,作者通过大量的文献资料研究,发现鲜有研究者从机构优化角度出发去解决这个问题。 本文的研究目的就是,从机构优化的角度出发,研究如何通过改变传动盘电极表面形状以提高电流变传动器中由电流变效应引起的传递力矩(以下称电流变力矩)的问题。文中提出了一种波纹曲面圆盘以替代传统的平面圆盘,使得装置处于剪切挤压工作模式,与处于剪切模式下的双平盘电流变传动器相比,作者期望这样的设计能够大大提高电流变力矩。 本文详细和系统地开展了下列科学研究工作: 首先是制备电流变液。同时,在自行改造的NXS-11A圆筒型粘度仪上,测试了电流变材料特性包括剪切应力、动态粘度随外加电场、更多还原

【Abstract】 Electrorheological(ER) technology is an innovative electromechanical-hydrau lic technology. Based on the electric-controlled performance of ER fluids, ER technology is expected to make revolutionary change to some traditional technology. The technology has significant advantages as following: simpler structure, quicker response, better controllability and intellectual technology. As the research has developed greatly these years, ER technology has being attracted more and more attentions from scientists and engineers in the world.As we know, the key problem to restrict ER technology to be used in drive and brake applications is that torque transmitted by ER device is not enough to meet the needs in engineering implementation due to low field-dependent stress of ER materials. Having surveyed and covered a vast amount of engineering literature, the present author has found that there is few researchers who worked to solve the problem by means of optimizing mechanism configuration.The objective of this work is to study how to improve transmitted torque caused by ER effect (named ER torque) of ER actuator by means of changing surface shape of drive disc electrode. In this dissertation, the ripple disc is proposed to replace traditional plate disc for operating in shear-squeeze-flow mode. This configuration is presumed to be able to enhance ER torque compared with ER actuator with double discs in which ER fluids are operated in shear-flow mode.To put it more systematically, the present dissertation has been accomplished in the following ways.As the first step, ER fluids were made and material characteristic dependencies, including shear stress, dynamic viscosity, on changes in the applied external electric field, shear rate were measured and examined in the reformed apparatus of NXS-11Acylindrical viscometer.As the second step, in order to investigate the difference of ER torque between shear-flow mode and shear-squeeze-flow mode, a special equipment named single-disc ER actuator and some ripple discs with different shape had been designed and manufactured. Experimental setups also consists of: torque transducer, data acquisition system based on the National Instruments programming package, source of high voltage (AC/DC voltage resource) and adjustable-speed motor, etc.As the third step, a conformal transformation approach was employed to derive expressions to calculate the electric parameters including capacity, electric field in the plate-ripple disc of ER actuator configured by a driving plate disc and a driven ripple disc. On the other hand, the flow of ER fluids between plate disc and ripple disc was discussed in detail. The resulting analytical model is capable of predicting the relationships between the transmitted torque, including ER torque, and the characteristic parameters of ER fluids as well as configuration parameters of the mechanism.As the fourth step, a series of experiments for examining ER torque transmitted by the plate-ripple disc and the double-plate disc of ER actuators had been carried out. Many experiments data had been given for comparison with our calculations based on the analytical model in previous section. As a consequence, under the same conditions of ER fluids, mean fluid gap size, loading electric voltage, rotational speed of discs, we can make a conclusion that the plate-ripple disc can provide multiple ER torque than the double-plate disc of ER actuators. Good agreement was achieved between predicted results and measured results. Furthermore, the variation of the ER torque with electric field and rotational speed of discs was obtained in the work. In addition, ER power (power caused by ER effect), leakage current and leakage power had also been investigated.ER transmission system is a nonlinear and time-variant system and neural network, which is known to be very effective for the uncertain control system, was employed to model ER device. However, this algorithm is not capable of expressing the characteristic of ER device. At the end of the work, a new algorithm incorporating genetic al更多还原