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Electrorheological fluids for aircraft flight control: feasibility of a position servomechanism. Final report

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Technical Report Documentation Page 3. Recipientb Catdog No. 5. Report Date July 1991 6. P.rtonning Organizatlon Coda 8. Perlwming Organization Rapor( No. UMTRI-91-30 10. Work Unit No. (TRAIS) 11. Conbaa or Cymt No. P.O. 1199 13. Typo of Report and Period Covemd Final: 4125190-4/1/91 14. Sponroring Agency Codr I. Report No. UMTRI-91-30 2 Government Acemaion No. 4 Title a d Subtltk Electrorheological Fluids for Aircraft Flight Control: Feasibility of a Position Servomechanism 7. Author(@) Zheng Lou, Robert D. Ervin, Frank E. Filisko 9: Performing OIgrniution Nanw and Addmu The University of Michigan Transportation Research Institute 2901 Baxter Road, Ann Arbor, Michigan 48109 12 Sponsoring Agency Nam ud A d b e u Dynamic Controls, Inc. 7060 Cliffwood Place Dayton, OH 45424 is. Supplemenmy NoPer - la Abrura In this second phase of the study, an electrorheological (ER) position control system has been designed, fabricated and assembled to test the feasibility of ER fluids in a system which is similar to flight-control servos. In a pilot-valve stage of this system, an ER bridge has been shown to be successful in producing a controlled pressure differential up to 250 psi for driving the spool of a power-stage valve. Upon closing the loop around the position of a hydraulic cylinder, the assembled system was able to control the motion of the actuator in slow-speed scenarios Throughout the process of system testing, ER fluid samples were seen to be stable and consistent in performance. Both analysis and experiment showed that although the ER response phenomenon, itself, exhibits a bandwidth in the kilohertz range, the flxed upper bound in ER shear stress reduces the actual bandwidth of an assembled device. With a peak yield shear stress of 0.1 psi, the valve devices assembled here were computed to have a maximum possible bandwidth of 227 Hz. The basic analysis underlying a rather complete numerical simulation was fo

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