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arXiv · 2103.16802

Optimal sensor and actuator placement for feedback control of vortex shedding

Bo Jin·Simon J. Illingworth·Richard D. Sandberg
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Abstract

We consider linear feedback control of the two-dimensional flow past a cylinder at low Reynolds numbers, with a particular focus on the optimal placement of a single sensor and a single actuator. To accommodate the high dimensionality of the flow we compute its leading resolvent forcing and response modes to enable the design of H2-optimal estimators and controllers. We then investigate three control problems: i) optimal estimation (OE) in which we measure the flow at a single location and estimate the entire flow; ii) full-state information control (FIC) in which we measure the entire flow but actuate at only one location; and iii) the overall feedback control problem in which a single sensor is available for measurement and a single actuator is available for control. We characterize the performance of these control arrangements over a range of sensor and actuator placements and discuss implications for effective feedback control when using a single sensor and a single actuator. The optimal sensor and actuator placements found for the OE and FIC problems are also compared to those found for the overall feedback control problem over a range of Reynolds numbers. This comparison reveals the key factors and conflicting trade-offs that limit feedback control performance.

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Bo Jin, Simon J. Illingworth, Richard D. Sandberg. 2021-03-31. Optimal sensor and actuator placement for feedback control of vortex shedding. https://doi.org/10.1017/jfm.2021.948

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