The use of ER (electrorheological) fluid) within an aerospace system is outlined. The advantages of ER fluid-based systems are given followed by design considerations which include those related to the non-linear behavior of an ER fluid subjected to oscillatory shear. A control strategy is outlined for the use of a smart LG (landing gear) oleo incorporating ER fluids. The issues associated with airworthiness requirements and ER fluid devices are also considered. For airworthiness approval a smart oleo based LG system must primarily be shown to be safe and as such has to be fault tolerant. A major failure for this application would be if the control strategy failed and the oleo damping coefficient was consistently too low; a backup system is therefore incorporated into the design and other potential modes of failure considered. A semi-active control strategy applied to a variable damping coefficient LG oleo has specific requirements, partly due to the fact that for the take-off and landing phases of flight they are different. A semi-active control strategy is outlined based on the requirements for the alteration of damping coefficient according to the phase of aircraft flight. The strategy is the focus of current work to estimate the effectiveness of semi-active vibration control as applied to an undercarriage.
The application of a smart landing gear oleo incorporating Electrorheological fluid
Journal of Intelligent Material Systems and Structures ; 9 , 8 ; 592-600
1998
9 Seiten, 10 Bilder, 5 Quellen
Article (Journal)
English
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