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An Electrorheologically Controlled Semi-Active Landing Gear
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English
Abstract
This study is to explore the application of electrorheology (ER) to the real-time control of damping forces that are transmitted through the nose landing gear for an F-106B aircraft. The main part of the landing gear is a strut that consists of a pneumatic spring and an ER controlled damper that is situated on the strut centerline and applies a force directly opposing the vertical displacement of the nose wheel. The damping element rotates in response to strut displacement, employing a co-axial arrangement of stator and rotor plates connected to the opposing electrodes in the control circuit. The vertical displacement is converted into rotation of the damper through a screw-nut mechanism. The ER fluid between the electrodes is thus engaged in shear along circumferential lines of action. This design results in a fast time response and a high ratio of strut forces achieved under ER- vs. zero-field control. Compact size and simplicity in fabrication are also attained. The analysis shows that when using an ER fluid of a yield stress of 7 kPa, the energy absorption efficiency of the landing gear can reach almost 100% at various sink rates.
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Citation
Lou, Z., Ervin, R., Filisko, F., and Winkler, C., "An Electrorheologically Controlled Semi-Active Landing Gear," SAE Technical Paper 931403, 1993, https://doi.org/10.4271/931403.Also In
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