應用於半主動減振系統之磁流體阻尼器的系統鑑別與控制

在精密工業上，外界振動干擾對產品的精度有很大的影響，常見的減振系統大多屬於被動式架構，對於外界動態之振動干擾上，減振效果有其限制，本文旨在研究半主動控制對於平台結構減振效果，利用所設計之擠壓式MR阻尼器，調變阻尼器上之電流來減低激振器所產生的外界干擾以達到半主動減振的效果。首先我們藉由頻譜分析儀擷取所建構之擠壓式MR阻尼器之位移與受力情形，再利用Bi-viscosity model模擬實際擠壓式MR減振器的受力磁滯現象，透過基因演算法最佳化其Bi-viscosity model之系統參數。再者將模型建構於結構數學方程式之中，找出不同振動頻率與振幅大小下的最佳減振效果所相應的電流值。依據不同振動頻率與振幅大小之最佳減振電流值來建立模糊規則庫，並使用模糊控制器於一磁流體減振器之半主動式減振架構上，來調整磁流體減振器之電流大小，最後套用建立之模糊規則於實際結構中，針對不同外界振動干擾做振動之抑制，再與self-tune之方法比較兩者之間的抑制效率。

關鍵字

磁流變液； Bi-viscosity模型；模糊控制器； cRIO

並列摘要

In precision industry, external vibration disturbance will influence the precise machining and manufacturing accuracy. In general, most vibration isolation platform belong to the passive system, in external dynamic interference, passive vibration isolation table has its limitations. This research is aimed to study the isolation effect of MR damping implemented to a precision table. Adjust current of the MR damper to isolate external vibration disturbance that reached semi-active control. First, by using spectrum analyzer to capture the displacement and force on the constructed of squeeze mode MR damper, then use Bi-viscosity model to simulation the extrusion force of MR damper. Through genetic algorithms to optimize the system parameters of Bi-viscosity model. And construct whole system that to identify different vibration frequency and amplitude of the best current table in passive form, for optimal adjustment of current coefficient of fuzzy control rules. Finally this rule table will be constructed in the cRIO to verify the reduce vibration effect for different external vibration disturbance of actual platform, then compare with self-tune control method.

並列關鍵字

MR damper ； Bi-viscosity model ； Fuzzy Controller ； cRIO

參考文獻

[1] J. Rabinow , ”The Magnetic Fluid Clutch,”AIEE Transactions, Vol. 67, 1948, pp.1308-1315.

[4] Z.P. Shulman, V.I. Kordonsky, E.A. Zaltsgendlder, I.V. Prokhorove, “Structure, physical properties and dynamics of megnetorheological suspensions,” Int. J. Multiphase Flow, Vol. 12, No. 6, 1986, pp. 935-955.

[5] J. D. Carlson,” MR fluids and devices in the real world,” International Journal of Modern Physics B, 2005, pp. 56-75.

[6] Haiping Du, Kam Yim Sze, JamesLam, “Semi-active H-infinite control of vehicle suspension with magneto-rheological dampers,” Journal of Sound and Vibration, Vol.283, 2005, pp. 981-996.

[7] A.G. Olabi , A. Grunwald, “Design and application of magneto-rheological fluid,” Materials and Design, Vol. 28, 2007, pp. 2658–2664.

國際替代計量

應用於半主動減振系統之磁流體阻尼器的系統鑑別與控制

未授權

主題瀏覽