This thesis investigates the basic characteristics, constituents and producing procedure of Magneto Rheological Fluid (MRF).MRF is a kind of controllable fluid.It is a sort of suspended substances comprised of non-conducting magnetic fluid and tiny soft magnetism granules that is evenly distributed.It exhibits low viscidity Newton fluid on the condition of null-magnetic field.In contrast, it shows characteristics such as the adhesiveness and low fluidity of Bingham in the scale of millisecond.Compared to Electricity Rheological Fluid (ERF), MRF has the advantages such as Field coil voltage is low, shear yield strength is high and it is not sensitive to impurities, temperature and other factors.This give the Magneto Rheological Damping made by it great prospects in bridge structuring, the areas of active, semi-active vibration control in construction structuring.Considering the issue of economy, when applied in bridge structuring, Magneto Rheological Damping are usually used in Cable-stayed bridge cable reducing vibration and some important multi-span continuous bridge with high piers.Also, Magneto Rheological Damping can be used in Simply supported steel truss railway bridge.%介绍了磁流变液基本特性、组成及磁流变液的制备工艺.磁流变液属可控流体,是由非导磁性液体和均匀分散其中的微小软磁性颗粒混合而成的悬浮体.在零磁场条件下呈现出低粘度牛顿流体特性;在强磁场作用下,则可在毫秒级的时间内呈现出高粘度、低流动性的Bingham体特性.与电流变液相比,磁流变液具有励磁线圈工作电压低、剪切屈服强度高、对体内杂质温度等因素不敏感等优点.这使得由其制成的磁流变阻尼器在桥梁结构、建筑结构主动、半主动震动控制领域展现了很好的应用前景.考虑到经济性,目前,桥梁结构用磁流变阻尼器主要针对斜拉桥拉索减振及重要的多跨高墩连续梁桥.铁路简支钢桁梁桥也有应用.
展开▼
