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This paper presents a generalized iterative learning control (ILC) design in the frequency domain with experimental validation. The optimal ILC learning function and robustness filter function are simultaneously optimized by solving a linear programming problem using frequency response functions. Moreover, the design realizes an optimal trade-off between robust convergence, converged tracking performance, convergence speed, and input constraints. The proposed ILC method is experimentally validated on a lab scale overhead crane system. The results demonstrate the advantages of the approach as an automation design with optimal solutions, efficient computation, robustness and intuitive tuning for trade-off analyses between multiple ILC specifications.