29 March 2013 Nonlinear dynamic modeling for smart material electro-hydraulic actuator development
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Abstract
Smart material electro-hydraulic actuators use hydraulic rectification by one-way check valves to amplify the motion of smart materials, such as magnetostrictives and piezoelectrics, in order to create compact, lightweight actuators. A piston pump driven by a smart material is combined with a hydraulic cylinder to form a self-contained, power-by-wire actuator that can be used in place of a conventional hydraulic system without the need for hydraulic lines and a centralized pump. The performance of an experimental actuator driven by a 12.7 mm diameter, 114 mm length Terfenol-D rod is evaluated over a range of applied input frequencies, loads, and currents. The peak performance achieved is 37 W, moving a 220 N load at a rate of 17 cm/s and producing a blocked pressure of 12.5 MPa. Additional tests are conducted to quantify the dynamic behavior of the one-way reed valves using a scanning laser vibrometer to identify the frequency response of the reeds and the effect of the valve seat and fluid mass loading. A lumped-parameter model is developed for the system that includes valve inertia and fluid response nonlinearities, and the model results are compared with the experimental data.
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John P. Larson, John P. Larson, Marcelo J. Dapino, Marcelo J. Dapino, } "Nonlinear dynamic modeling for smart material electro-hydraulic actuator development", Proc. SPIE 8690, Industrial and Commercial Applications of Smart Structures Technologies 2013, 86900I (29 March 2013); doi: 10.1117/12.2009921; https://doi.org/10.1117/12.2009921
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