Intelligent Vibration Control System by a Variable-damping Dynamic Absorber Using ER Fluid

本课题研究的是一种可变阻尼动力减振器，将电流变液应用于传统动力减振器的阻尼元件。建立了变阻尼动力减振器的原型，并用三层结构模型验证了其性能。现有动力减振器的特殊能力是用一个动力减振器在多个频率上减小振动幅值。电流变流体是一种功能流体，其屈服剪切应力可随外加电场强度而改变。由于其特殊的性能，电流变流体已被应用于各种机械部件，如汽车减震器和发动机支架、离合器、阀门等。将电流变流体应用于机械部件的实际方法之一可能是通过将电流变流体与常规机械部件有效结合来扩大其性能。从这个意义上说，本文显示了电流变流体在常规型动力吸收器上的成功应用。提出了一种由用于系统辨识的前向模型网络和控制器网络组成的自适应神经网络控制系统来控制动态减振器的变阻尼单元。数值模拟结果与实验结果吻合较好。

This project is on a variable-damping dynamic absorber applying Electrorheological (ER) fluid to the damping element of a conventional-type dynamic absorber. A prototype of variable-damping dynamic absorber was constructed and its performance was verified with a three-story structural model. The special ability of the present dynamic absorber is to reduce the vibration amplitude at several frequencies by a single dynamic absorber. ER fluid is functional fluid whose yield shear stress can be changed by the applied electric field strength. Because of its peculiar property, ER fluid has been applied to various mechanical components such as shock absorbers and engine mounts for vehicles, clutches, valves, etc. One of the practical ways in applying ER fluid to mechanical components may be to expand the performance of conventional mechanical components by combining ER fluid effectively with them. In this sense, this paper shows a successful application of ER fluid to a conventional-type dynamic absorber. An adaptive neural network control system composed of a forward model network for system identification and a controller network was introduced to control the variable-damping element of the dynamic absorber. The numerical simulations show good agreements with the experimental results.