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- W4288804583 abstract "Robust controllers ensure stability in feedback loops designed under uncertainty but at the cost of performance. Model uncertainty in time-invariant systems can be reduced by recently proposed learning-based methods, which improve the performance of robust controllers using data. However, in practice, many systems also exhibit uncertainty in the form of changes over time, e.g., due to weight shifts or wear and tear, leading to decreased performance or instability of the learning-based controller. We propose an event-triggered learning algorithm that decides when to learn in the face of uncertainty in the LQR problem with rare or slow changes. Our key idea is to switch between robust and learned controllers. For learning, we first approximate the optimal length of the learning phase via Monte-Carlo estimations using a probabilistic model. We then design a statistical test for uncertain systems based on the moment-generating function of the LQR cost. The test detects changes in the system under control and triggers re-learning when control performance deteriorates due to system changes. We demonstrate improved performance over a robust controller baseline in a numerical example." @default.
- W4288804583 created "2022-07-30" @default.
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- W4288804583 date "2022-07-28" @default.
- W4288804583 modified "2023-09-29" @default.
- W4288804583 title "Improving the Performance of Robust Control through Event-Triggered Learning" @default.
- W4288804583 doi "https://doi.org/10.48550/arxiv.2207.14252" @default.
- W4288804583 hasPublicationYear "2022" @default.
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