Application of CFD in the design and analysis of a piezoelectric hydraulic pump

Shaju John; Christopher Cadou; Norman M. Wereley

doi:10.1117/12.540413

26 July 2004 Application of CFD in the design and analysis of a piezoelectric hydraulic pump

Shaju John, Christopher Cadou, Norman M. Wereley

Proceedings Volume 5390, Smart Structures and Materials 2004: Smart Structures and Integrated Systems; (2004) https://doi.org/10.1117/12.540413
Event: Smart Structures and Materials, 2004, San Diego, CA, United States

Abstract

Smart materials' ability to deliver large block forces in a small package while operating at high frequencies makes them extremely attractive for converting electrical to mechanical power. This has led to the development of hybrid actuators consisting of co-located smart material actuated pumps and hydraulic cylinders that are connected by a set of fast-acting valves. The overall success of the hybrid concept hinges on the effectiveness of the coupling between the smart material and the fluid. This, in turn, is strongly dependent on the resistance to fluid flow in the device. This paper presents the results of two and three dimensional simulations of fluid flow in a prototpype hybrid actuator being developed for aerospace applications. The steady simulations show that losses in the device result primarily from three dimensional effects and that two dimensional approaches can underestimate losses by approximately a factor of 40. The effects of varying design parameters like the pumping chamber height, discharge port location, and discharge port chamfer are also explored and are found to have significant impacts on performance. Three dimensional, unsteady simulations demonstrate how resistance to fluid flow in the pump reduces the amplitude of the piezo displacement and thus limits the flow rate of the device.

Citation Download Citation

Shaju John, Christopher Cadou, and Norman M. Wereley "Application of CFD in the design and analysis of a piezoelectric hydraulic pump", Proc. SPIE 5390, Smart Structures and Materials 2004: Smart Structures and Integrated Systems, (26 July 2004); https://doi.org/10.1117/12.540413

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