多级蜿蜒磁路式磁流变阻尼器的设计与分析

Design and analysis of MR damper with multistage serpentine magnetic circuit

为了改善磁流变阻尼器的阻尼特性,设计了一种多级蜿蜒磁路式磁流变阻尼器。该磁流变阻尼器通过导磁环和阻磁环的堆叠来引导磁感线的走向,迫使磁感线数次穿过磁流变阻尼器的节流通道,提高了节流通道的利用效率。建立了考虑磁流变液非线性流动特性的数学模型,并通过有限元方法进行了磁路分析,进而对所设计的磁流变阻尼器的特性进行预测。将所设计的磁流变阻尼器的阻尼特性与具有相同体积的传统磁流变阻尼器进行了比较,包括可控阻尼力、等效阻尼和动态范围。结果显示在正弦激励速度为0.125m/s,并通入2.0A电流的情形下,所设计的磁流变阻尼器的最大可控阻尼力为11 000N,约为传统磁流变阻尼器的2.3倍。此外,所设计的磁流变阻尼器并没有使零场情形下的阻尼力增大。所设计的磁流变阻尼器具有优良的阻尼性能,适用于广泛的工程减振应用。

A magneto-rheological（MR）damper with multistage serpentine magnetic circuit is designed to improve damping performance.Magnetically conductive and non-conductive elements were stacked to weave the magnetic flux path,and it was forced to pass through the flow channel of MR damper several times,which could improve the efficiency of flow channel.The mathematical model of the designed MR damper considering the nonlinear flow effect of the MR fluid in the flow channel was established,and the finite element analysis（FEA）was utilized to predict the damping characteristics of the designed MR damper.The damping performance of the designed MR damper was also theoretically compared with that of a traditional MR damper with the same outer dimensions（radius,length）of piston by the performance matrix,such as the damping force,equivalent damping,and dynamic range.Results showed the designed MR damper could provide a large controllable damping force as high as 11 000 Nunder excitation velocity of 0.125m/s for current of 2.0A,which was about 2.3 times over that of traditional MR damper.What＇s more,the damping force of the designed MR damper was equal to that of traditional MR damper in no current case,for the structural form and dimensions of flow channel of the designed MR damper and the traditional MR damper were same.The designed MR damper has excellent damping performance and is suitable for a wide range of engineering applications of vibration suppression.