A thin-film magnetorheological fluid damper/lock
A thin-film magnetorheological fluid damper/lock
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DOI：
10.1088/0964-1726/14/2/011
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发表时间：
2005-03
影响因子：
4.1
通讯作者：
Gangbing Song;M. Zeng
中科院分区：
文献类型：
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作者：
Gangbing Song;M. Zeng
本文介绍了一种薄膜磁流变液阻尼器/锁的设计、测试和应用。这种磁流变阻尼器/锁是为形状记忆合金丝驱动的模型自适应风扇喷嘴系统而设计的。磁流变液阻尼器/锁(风扇喷嘴系统共有8个)将锁定风扇喷嘴的开口尺寸，并在系统振动时提供减振。为此，MR阻尼器/锁必须具有以下特性：(1)当电源关闭时，装置处于锁定位置。(2)装置通电时静摩擦力小(小于1磅)。(3)该装置在通电期间滑动时产生较小的动摩擦力。(4)其阻尼系数可调。(5)必须紧凑。为了满足这些要求，采用了一种使用薄磁流变液薄膜的阻尼器/锁的新设计。该装置由五个主要部件组成：两个软钢棒、两堆永磁体、两组磁线、一个软钢滑块和磁流变液。利用永磁体，磁流变液被捕获，装置始终处于锁定位置。当设备通电时，电磁铁的磁通部分抵消并重新定向来自永久磁铁的剩余磁通，然后滑块可以自由移动。在这种设计中，磁流变液减小了气隙，并在断电时增加了锁定力。另一方面，当电磁铁通电时，它也起到了润滑剂的作用，减少了动摩擦力。对磁流变阻尼器/锁进行了大量的试验，得到了其在不同外加电压下的力-位移曲线和力-速度曲线。利用这些试验结果，将磁流变阻尼器/锁应用于模型自适应风扇喷嘴系统，通过反馈控制来执行锁定和减振任务。实验结果表明，这些任务都是成功完成的。
This paper presents the design, testing, and application of a thin-film magnetorheological (MR) fluid damper/lock. This MR damper/lock is designed for the use in a model adaptive fan nozzle system actuated by shape memory alloy wires. The MR damper/lock (a total of eight in the fan nozzle system) will lock the opening size of the fan nozzle and provides damping when the system vibrates. For this purpose, the MR damper/lock has to have the following characteristics: (1) The device is in the locking position when the power is off. (2) The device has a small static friction force (less than 1 lbf) when the power is on. (3) The device generates a small kinetic friction force when it slides during the power-on period. (4) Its damping coefficient can be adjusted. (5) It must be compact. To meet these requirements, a new design of a damper/lock using thin MR fluid film is employed. The device consists of five major components: two soft steel bars, two stacks of permanent magnets, two groups of magnetic wires, a soft steel slider, and MR fluids. Utilizing the permanent magnets, the MR fluid is trapped and the device is always in the locked position. When the device is powered on, the flux of the electromagnets partially cancels and re-directs the rest of the flux from the permanent magnets, and then the slider is free to move. In this design, MR fluid reduces the air gap and increases the locking force when it is powered off. On the other hand, it also functions as a lubricant to reduce the kinetic friction forces when electromagnets are powered on. Extensive tests of the MR damper/lock are conducted to reveal its force–displacement curves and force–velocity curves under different applied voltages. Utilizing these testing results, the MR damper/lock is applied to the model adaptive fan nozzle system to perform both locking and damping tasks with a feedback control. Experimental results show that these tasks are successfully accomplished.