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Proceedings Paper

Performance of a piezohydraulic actuation system with active valves
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Paper Abstract

The concept of piezohydraulic actuation is to transfer the reciprocal small stroke displacement of piezoceramics into one directional movement by frequency rectification through the media of hydraulic fluid. Our work in piezohydraulic actuation is focused on the development of systems that incorporate active valves for flow control. We present experimental results demonstrating the importance of fluid compressibility and valve timing in the optimization of the output power of the actuation system. An efficiency analysis is also presented. Results show the effective bulk modulus of the fluid is approximately linearly dependent on pressure. A linear bulk modulus to pressure model for the working fluid is developed and the data is compared to experimental results. An array of different timing tests are run on the inlet and outlet valves and the results show that their timing is crucial to the performance of the system. Also shown is that the optimal timing conditions change slightly under different loads. To analyze the power and efficiency, the system is considered as two sub-systems, the piezoceramics sub-system and the hydraulic component sub-system. The power and efficiency of each sub-system is measured and analyzed under different loads. As load increases, the results show that the efficiency of the piezoceramics decreases while the efficiency of the hydraulic components increases.

Paper Details

Date Published: 15 July 2002
PDF: 15 pages
Proc. SPIE 4701, Smart Structures and Materials 2002: Smart Structures and Integrated Systems, (15 July 2002); doi: 10.1117/12.474690
Show Author Affiliations
Honghui Tan, Virginia Polytechnic Institute and State Univ. (United States)
William Hurst, Virginia Polytechnic Institute and State Univ. (United States)
Donald J. Leo, Virginia Polytechnic Institute and State Univ. (United States)


Published in SPIE Proceedings Vol. 4701:
Smart Structures and Materials 2002: Smart Structures and Integrated Systems
L. Porter Davis, Editor(s)

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