Title :
Adaptive optimal valve control for a resonance fluid actuator
Author :
Koveos, Yannis ; Tzes, Anthony
Author_Institution :
Electr. & Comput. Eng., Univ. of Patras, Rio, Greece
Abstract :
In this article, an optimal control scheme for a piezo- hydraulic actuator exploiting resonance effects is presented. The proposed actuator relies its operation on the significant pressure built up in a fluid pipe during resonance. The actuator´s piston houses a valve which rectifies the wave´s motion into direct mechanical motion. The discretization of the partial differential equation from the compressible Navier - Stokes equations that captures the fluid - wave propagation leads to a state space description suitable for the development of control algorithms. The valve and piezo dynamics can be embedded in this model for examining the overall performance of the actuator. An optimal controller is designed to maximize the differential pressure across the piston leading to a bang-bang type of control input. The phase and pulse width of the control effort are adjusted based on an adaptive scheme using the gradient of the cost function. Simulation studies are offered for verifying the actuator´s principle of operation. In comparison to a passive valve configuration this scheme offers a significant improvement measured by the generated blocking forces.
Keywords :
Navier-Stokes equations; adaptive control; bang-bang control; differential equations; hydraulic actuators; optimal control; pistons; state-space methods; valves; Navier Stokes equations; actuators piston houses; adaptive optimal valve control; bang-bang control; control algorithms development; differential equation; direct mechanical motion; fluid wave propagation; piezo hydraulic actuator; resonance fluid actuator; state space description; waves motion; Adaptive control; Differential equations; Hydraulic actuators; Optimal control; Partial differential equations; Pistons; Pressure control; Programmable control; Resonance; Valves; Resonance Fluid Actuator; optimal valve control; piezo — hydraulic actuation;
Conference_Titel :
Industrial Electronics, 2009. IECON '09. 35th Annual Conference of IEEE
Conference_Location :
Porto
Print_ISBN :
978-1-4244-4648-3
Electronic_ISBN :
1553-572X
DOI :
10.1109/IECON.2009.5414723