The design and analysis of feedback controllers for digital displacement machines requires a control oriented model. The displacement throughput of a full stroke operated machine is altered on a stroke-by-stroke basis at fixed rotation angles. In the case of a fixed speed operation, it may be treated as a Discrete Linear Time Invariant control problem with synchronous sampling rate. To make synchronous linear control theory applicable for a variable speed digital displacement machine, a method based on event-driven control is presented. Using this method, the time domain differential equations are converted into the spatial (position) domain to obtain a constant sampling rate and thus allowing for use of classical control theory. The method is applied to a down scaled digital fluid power motor, where the motor speed is controlled at varying references under varying pressure and load torque conditions. The controller synthesis is carried out as a discrete optimal deterministic problem with full state feedback. Based on a linear analysis of the feedback control system, stability is proven in a pre-specified operation region. Simulation of a non-linear evaluation model with the controller implemented shows great performance, both with respect to tracking and disturbance rejection.
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ASME/BATH 2017 Symposium on Fluid Power and Motion Control
October 16–19, 2017
Sarasota, Forida, USA
Conference Sponsors:
- Fluid Power Systems and Technology Division
ISBN:
978-0-7918-5833-2
PROCEEDINGS PAPER
Event-Driven Control of a Speed Varying Digital Displacement Machine
Niels H. Pedersen,
Niels H. Pedersen
Aalborg University, Aalborg East, Denmark
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Per Johansen,
Per Johansen
Aalborg University, Aalborg East, Denmark
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Torben O. Andersen
Torben O. Andersen
Aalborg University, Aalborg East, Denmark
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Niels H. Pedersen
Aalborg University, Aalborg East, Denmark
Per Johansen
Aalborg University, Aalborg East, Denmark
Torben O. Andersen
Aalborg University, Aalborg East, Denmark
Paper No:
FPMC2017-4260, V001T01A029; 10 pages
Published Online:
December 4, 2017
Citation
Pedersen, NH, Johansen, P, & Andersen, TO. "Event-Driven Control of a Speed Varying Digital Displacement Machine." Proceedings of the ASME/BATH 2017 Symposium on Fluid Power and Motion Control. ASME/BATH 2017 Symposium on Fluid Power and Motion Control. Sarasota, Forida, USA. October 16–19, 2017. V001T01A029. ASME. https://doi.org/10.1115/FPMC2017-4260
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