改进阻尼特性的内置平行双线圈磁流变阻尼器研究

提出了一种内置平行双线圈的磁流变阻尼器。推导了径向流和环形流磁流变阻尼器的压降数学模型。比较了具有串联双线圈的常规磁流变阻尼器和所提出的磁流变阻尼器的阻尼性能。分别对提出的磁流变阻尼器和常规磁流变阻尼器进行了电磁分析,从而验证所提出的磁流变阻尼器的原理并获得其磁路的磁特性。利用数值模拟分析比较了2种磁流变阻尼器的阻尼性能,分析结果表明内置平行双线圈的磁流变阻尼器具有更好的阻尼性能。依据所提出的磁流变阻尼器的结构原理制作了原型样机,通过实验验证了其阻尼性能的优越性。实验结果显示所提出的磁流变阻尼器的最大阻尼力约是常规磁流变阻尼器的1.86倍,等效阻尼约为常规磁流变等效阻尼的2倍。

Magneto-rheological Damper with Parallel Double Coil for Improvement of Damping Performance

Magneto-rheological (MR) damper is one kind of dampers using magneto rheological fluid as the working medium. The design and fabrication of a novel MR damper with parallel double coil are presented. Usually, MR damper with double or multi coil in serial is designed to obtain large damping force. This will lead to increase of MR damper length, and is not fit to limited installation space of length. The structural design of MR damper is focused to obtain required damping performance under limited dimension (especially the length). The technical originality is to propose a new MR damper configuration with the additional radial gap by double coil in parallel. The proposed MR damper is featured by the additional radial gap due to double coil in parallel. The conventional MR damper with serial double coil inevitably has two non active parts due to its structural features, while the proposed MR damper with parallel double coil has only one non-active part. In addition, the conventional MR damper with serial double coil has four magnetic poles, while the proposed MR damper with parallel double coil has two radial poles in addition to the four magnetic poles. A mathematical model for the proposed MR damper is developed. The conventional MR damper with serial double coil is also considered to compare damping performance with that of the proposed MR damper. The electromagnetic analysis for proposed and conventional MR damper is conducted to validate the principle of the proposed MR damper and obtain the magnetic properties of its magnetic circuit. After numerical comparison of the damping performances for the two MR damper designs, the MR damper with parallel double coil is chosen because of its better performance. The proposed MR damper is fabricated and investigated by means of experiment. According to the measured data, the proposed MR damper can provide much larger controllable damping force and almost twice the equivalent damping of the conventional MR damper.