磁流变液在离心机过临界技术中的应用  

Applications of magnetorheological fluid in critical speed passing technique of centrifuge

作　　者：马昆[1] 聂玉光[1] 张小章[1] 

机构地区：[1]清华大学工程物理系,北京100084

出　　处：《清华大学学报（自然科学版）》2008年第3期386-390,共5页Journal of Tsinghua University(Science and Technology)

摘　　要：磁流变液是一种新型智能材料,其独特的流变性使其在很多领域中备受关注。离心机过临界技术是离心机研制中的关键技术。为了探索离心机过临界的新方法,该文将磁流变液引入离心机下阻尼器的设计中,从理论和实验2方面对使用磁流变液下阻尼器的离心机转子在通过临界转速时的振动特性进行研究。结果显示:通过调节磁流变液阻尼器的外加磁场,可以使离心机转子无共振通过系统二阶临界转速;磁流变液阻尼器比传统的离心机阻尼器具有更为显著的减振效果。Magnetorheological fluids are intelligent materials that can be used in many technical fields because of their rheological properties. Magnetorheological fluids can be used in the critical speed passing technique for rotor-bearing systems which is important in centrifuge development. To explore a new method of critical speed passing technique of centrifuge, the magnetorheological fluid is used in the centrifuge lower damper. Theoretical and experimental studies of the vibration characteristics of a centrifuge rotor with a magnetorheological fluid damper show that the centrifuge rotor-bearing system can smoothly pass through the second-order critical speed without resonance by adjusting the magnetic field intensity in the magnetorheological fluid damper. The magnetorheological fluid damper is, therefore, more efficient than traditional centrifuge dampers for vibration control.

关 键 词：离心机 磁流变液 临界转速 不平衡响应 

分 类 号：O328[理学—一般力学与力学基础]