結構物的半主動控制系統以少量的能量驅動訊號，產生阻尼力，達到主動控制的效果，並且具有調整性，綜合了被動控制系統與主動控制系統的優點，其中磁流變阻尼器之應用為其典型之代表。

　　磁性流變流體（magnetorheological fluid簡稱MR fluid）在工業界上應用廣泛，尤其以機械、化工和光電工業上為最。由1960年代中期發展至今，已經開發出多種製造磁性流變流體的方法，其中主要材料是以磁性微粒、載液和界面活性劑組成。但這些製程都有著程序相當繁複以及製造成本昂貴的共同點，導致無法應用在結構物等磁流變阻尼器的大型腔體之應用需求上。

　　本論文以價格經濟及配方簡單為導向，以防沈劑代替界面活性劑，開發出製程及配方皆不同於以往的磁性流變流體，不但成本大幅下降了20倍，也可達到大量生產之目的，使其可以應用在結構物磁流變阻尼器的大型腔體中，當可大大提升半主動控制系統之務實可行性。

　　The sugnal of structural semi-active control system can be driven by small amount energy to induce damping force, and its regulative property can provide the system acted as active control system.Magnetorheological Damper, synthesizing the advantages of both active and passive control system, is the most typical device for the semi-active control system.
　
　　The magnetorheological fluid (MR fluid) is extensively applied, especially in the enginnering, chemical, and photoelectric industries.Today, there have been various methods for producing magnetorheological fluid, since initially developed in 1960s.The main materials involved are nothing but magnetic micro-particles,based fluids,and surfactants,etc. However,the existing processes of producing are usually relatively complicated and the cost is very high. Owing to these disadvantages,such kind of MR fluid products certainly will not meet the needs of MR damper with big chambers.

　　Based on low price and simple formula, surfactants is replaced by thixotropic agent to produce a new kind of MR fluid.According to propose manufacturing formula,MR fluid can be plenty produced with about one-twentieth cost when compare to existing market products. It results to meet the needs of MR dampers and the application feasibility of the semi-active structural control system can be surely increased.

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