【作者】 刘勇；

【导师】 徐龙祥； 周瑾；

【作者基本信息】 南京航空航天大学 ， 机械设计及理论， 2009， 硕士

【摘要】 本文针对磁流变阻尼器及其在磁悬浮轴承系统中的应用进行了研究。针对磁悬浮轴承系统刚度阻尼较小,抑制振动的效果差的缺点,而磁流变液具有粘度受控于外界磁场且效应连续,可逆,迅速和易于控制等优点,将磁流变阻尼器引入到磁悬浮轴承的减振中。结合磁悬浮轴承的工作特点,设计制作了一种小位移大阻尼力挤压式磁流变阻尼器,并与轴向磁悬浮轴承试验台相连接抑制推力盘振动。首先应用有限元软件ANSYS分析验证了磁流变阻尼器结构的合理性,然后对阻尼器的减振与阻尼特性进行了试验研究,最后借助MATLAB对试验数据进行了处理。基于对磁流变阻尼器的相关理论和试验结论,对阻尼器控制策略进行了研究,并将模糊控制算法应用于磁流变阻尼器的减振控制中,将阻尼器与轴向磁悬浮轴承试验台相结合,检验阻尼器在不同电流下的减振作用,并利用频谱分析仪得出有阻尼器时对轴向磁悬浮轴承系统Bode图的影响。对磁流变阻尼器试验结果表明:电流越大,示功图面积越大,与频率无关;电流越大,频率越大,阻尼力越大,非线性滞回特性愈明显。应用模糊控制算法控制的磁流变阻尼器对轴向磁悬浮轴承进行减振试验,控制效果良好。通过对轴向磁悬浮轴承系统Bode图的研究表明,随着阻尼器线圈电流的逐渐增加有效增加了系统的刚度和阻尼。本文研究表明磁流变阻尼器可为磁悬浮轴承系统提供可控刚度和阻尼,为克服磁悬浮系统抑制振动效果差的问题提供了一种新的思路。更多还原

【Abstract】 In this paper, MR damper and its application in magnetic bearing system was studied. Because of magnetic bearing has a disadvantage of small rigidity and damp together with the deficiency of restrain vibration, while the magnetorheological fluid controlled by external magnetic had advantage of the effect of continuous, reversible, rapid and easy to control, for what it was introduced in the magnetic bearing. Combined the characteristic of magnetic bearing, a small displacement and big damping force MR-damper was designed and manufactured to control the vibration in magnetic bearing. First of all, ANSYS was used to prove the correctness of the MR-damper structure, then some experimentations were carried and deal with the data with MATLAB. Based on the empirical results, the MR-damper’s control strategy was studied and fuzzy-control was adopted in MR-damper to restrain vibration in magnetic bearing. Effects of restrain vibration were tested in the magnetic bearing when assembled MR-damper. The Bode map was also researched by HP36670.Related conclusions were summarized: with increase of electric current the area of displacement—force became larger, the bigger with electric current and frequency the more dramatic and non-linear. When the MR–damper utilized fuzzy-control it had a good performance of restrain vibration to the magnetic bearing. Through the Bode map we knew that the MR-damper could supply effectively rigidity and damp with the increase of current. This research show that MR-damper designed in this paper is able to provide the rigidity and damp which can be controlled, and proposal a new way to sole the problem of the smallness of rigidity and damp in magnetic bearing.更多还原