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- W1603622892 abstract "Iterative learning control (ILC) is a technique for determining feedforward signals for systems that execute a task repeatedly. One approach towards designing ILC algorithms is to pose it as an optimization problem. Traditionally, norm optimal iterative learning control (NOILC) algorithms use l 2 -norm-type cost functions. However, many applications require optimizing non-smooth cost functions, e.g., in trajectory tracking where it is desirable to minimize the peak tracking error, i.e., its l ∞ -norm. In this paper, we explore the performance of a class of non-smooth cost functions along with constraints which can be recast into the constrained optimal ILC (COILC) framework. For linear systems with constraints (linear in the feedforward input) and certain cost functions (such as l 2 , l ∞ norms of tracking error and control effort), this optimization problem can be formulated as a quadratic program (QP) or a linear program (LP). These COILC problems can then be solved with a modified interior-point-type method. In this manuscript, we derive ILC algorithms for linear systems (and linear constraints) with (1) a pure l ∞ norm cost, (2) a mixed l 2 – l ∞ norm cost. We compare the results to the traditional l 2 norm (NOILC) in simulation and experiment to illustrate the effect of the choice of the cost function on the design of the optimized feedforward control effort and hence the optimal error profile." @default.
- W1603622892 created "2016-06-24" @default.
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- W1603622892 date "2015-07-01" @default.
- W1603622892 modified "2023-09-23" @default.
- W1603622892 title "Constrained optimal iterative learning control for mixed-norm cost functions" @default.
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- W1603622892 doi "https://doi.org/10.1109/acc.2015.7172099" @default.
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