Nonlinear dynamic modeling for smart material electro-hydraulic actuator development

John P. Larson; Marcelo J. Dapino

doi:10.1117/12.2009921

29 March 2013 Nonlinear dynamic modeling for smart material electro-hydraulic actuator development

John P. Larson, Marcelo J. Dapino

Proceedings Volume 8690, Industrial and Commercial Applications of Smart Structures Technologies 2013; 86900I (2013) https://doi.org/10.1117/12.2009921
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2013, San Diego, California, United States

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.

Citation Download Citation

John P. Larson and 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); https://doi.org/10.1117/12.2009921

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