EFFICIENT HYBRID ACTUATION USING SOLID-STATE ACTUATORS
Sponsor: DARPA/NASA
Duration: -12/31/00
Page Last Updated: 1/1/01
Objective:
Develop energy efficient hybrid actuators consisting of piezoelectric materials and hydraulic energy storage elements.
Specific tasks are:
- Develop a benchtop demonstration of the piezohydraulic system.
- Model the piezohydraulic system and correlate the model with experimental results.
- Build and test efficient electronics.
Results:
- A benchtop demonstration has been designed and tested. Blocked force of 105 N and a free velocity of 180 um/sec was measured. Primary limitation in system performance is the speed of the solenoid valves.
- A lumped parameter model of the complete piezohydraulic system was developed. The bandwidth and time response of the system was correlated with the model.
- Two generations of current-controlled power electronics were designed and tested.
Relevant Publications:
Journal Publications:
- Nasser, K,, Leo, D.J., 2001, "Efficiency of frequency-rectified piezohydraulic and piezopneumatic actuation," to appear, Journal of Intelligent Material Systems and Structures.
Conference Publications:
- Nasser, K., Vujic, N., Leo, D.J., and Cudney, H.H., 2001, "Modeling and testing of a piezohydraulic actuation system," to appear, SPIE Smart Materials and Structures Conference.
- Nasser, K,, Leo, D.J., 2000, "Efficiency of frequency-rectified piezohydraulic and piezopneumatic actuation," Proceedings of the Adaptive Structures and Materials Symposium, ASME vol. AD-60, pp. 485- 498.
- Nasser, K., Leo, D.J., and Cudney, H.H., 2000, "Compact piezohydraulic actuation system," to appear in the Proceedings of the SPIE, Newport Beach, CA, SPIE Paper Number 3991-41.