Automatica

This paper concerns a particular property of the basic instrumental variable (IV) estimator that is useful for multiple-input multiple-output (MIMO) modeling problems where it is not obvious how to partition the available signals between the sets of inputs and outputs. In general, a repartitioning of the input and output signals will result in a different model compared to the original input–outp…

This paper studies breakpoints in root loci with polynomial gain parameterization, which are critical for understanding the stability and performance of control systems with complex gain dependencies. Unlike affine root loci, polynomially parameterized root loci require a more nuanced approach due to irregular branch distributions near breakpoints. Using tools from algebraic geometry, such as Pui…

This paper addresses the static output-feedback (SOF) control problem for discrete-time systems subject simultaneously to input saturation, non-vanishing disturbances, and uncertainties described in a polytopic form. Level sets of the Lyapunov function are used to characterize the estimation of the domain of admissible initial states for the system and also to determine a region where the states …