ER Fluid Application to a Controllable Mount

本课题研究了一种采用阻尼可控隔振器的半主动基础隔振系统。通过在隔离器上施加电流变液来实现阻尼可控性。内质网流体是一类高功能材料，其表观粘度可以随外加电场的变化而变化。内质网流体吸引人的特点是表观粘度变化大，响应时间快。在一定的电场作用下，粘度与不加电场时的值相比，可发生几十倍或数百倍的变化。据说响应时间短至几毫秒。制作了一个原型隔振器，并对其性能进行了研究。在恒定振动幅值条件下进行了实验，详细研究了内能阻尼器对小幅值振动的效率。所得结论如下：(1)通过控制外加电场强度，可以改变隔振器的刚度和阻尼能力。(2)提出了目前该类隔振器的理想模型。(3)阻尼可控性与振动幅值有关。

In this project, one kind of semi-active base isolation system is dealt with, in which a damping-controllable vibration isolator is adopted. The damping-controllability was accomplished by applying Electro-Rheological (ER) fluid to the isolator. ER fluid is known as a class of highly functional material whose apparent viscosity can be varied in response to the applied electric field. The attractive characteristics of ER fluid are wide variation of apparent viscosity and quick response time. The viscosity can be varied several tens times or hundreds times compared with the value obtained without any electric field when subjected to some electric field. The response time is said to be as short as several milliseconds.A prototype vibration isolator was constructed and its performance was investigated. The experiments were conducted under the condition of constant vibration amplitude, in which a detailed investigation was made into the efficiency of ER damper for a small amplitude vibration. Conclusions obtained are as follows ; (1) Stiffness as well as damping capacity of the present vibration isolator can be varied by controlling the applied electric field strength. (2) An idealized model was proposed for the present type of vibration isolator. (3) The damping controllability was shown to be dependent on the vibration amplitude.