A method for calculating all periodic solutions and their domains of attraction for flexible systems under nonlinear feedback control is presented. The systems considered consist of mechanical systems with flexible modes and a relay type controller coupled with a linear control law, operating in a feedback configuration that includes a time delay. The proposed approach includes three steps. First, limit cycle frequencies and periodic fixed points are computed exactly, using a block diagonal state-space modal representation of the plant dynamics. Then the relay switching surface is chosen as the Poincare mapping surface and is discretized using the cell mapping method. Finally, the region of attraction for each limit cycle is computed using the cell mapping algorithm and employing an error based convergence criterion. An example consisting of a model of a flexible system, a relay with hysteresis, a linear control law, and a pure time delay is used to demonstrate the proposed approach.
- Dynamic Systems and Control Division
Periodic Solutions for Flexible Structures Under Relay Feedback Control With Time Delay
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Borre, M, & Flashner, H. "Periodic Solutions for Flexible Structures Under Relay Feedback Control With Time Delay." Proceedings of the ASME 2012 5th Annual Dynamic Systems and Control Conference joint with the JSME 2012 11th Motion and Vibration Conference. Volume 2: Legged Locomotion; Mechatronic Systems; Mechatronics; Mechatronics for Aquatic Environments; MEMS Control; Model Predictive Control; Modeling and Model-Based Control of Advanced IC Engines; Modeling and Simulation; Multi-Agent and Cooperative Systems; Musculoskeletal Dynamic Systems; Nano Systems; Nonlinear Systems; Nonlinear Systems and Control; Optimal Control; Pattern Recognition and Intelligent Systems; Power and Renewable Energy Systems; Powertrain Systems. Fort Lauderdale, Florida, USA. October 17–19, 2012. pp. 607-616. ASME. https://doi.org/10.1115/DSCC2012-MOVIC2012-8849
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