Gunter Stein

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A systematic control design methodology is introduced for multi-input/multi-output stable open loop plants with multiple saturations. This new methodology is a substantial improvement over previous heuristic single-input/single-output approaches. The idea is to introduce a supervisor loop so that when the references and/or disturbances are sufficiently(More)
The Panel on Future Directions in Control, Dynamics, and Systems was formed in April 2000 to provide a renewed vision of future challenges and opportunities in the field, along with recommendations to government agencies, universities, and research organizations to ensure continued progress in areas of importance to the industrial and defense base. Its(More)
The paper considers one of the fundamental issues in design and analysis of sampled multidimensional systems that of uncertainty modeling and robust stability analysis. Methods of structured uncertainty analysis (μ-analysis) are extended towards systems with dynamical and non-causal spatial coordinates. The stability is understood in a broad sense and(More)
The field of control provides the principles and methods used to design physical and information systems that maintain desirable performance by sensing and automatically adapting to changes in the environment. Over the last forty years the field has seen huge advances, leveraging technology improvements in sensing and computation with breakthroughs in the(More)
1. INTRODUCTION This paper reports the outcome of an exhaustive analyt-Due to space limitations we cannot possibly provide in ical and numerical investigation of stability and ro-this paper analytical and simulation evidence of all bustness properties of a wide class of adaptive control conclusions outlined in the abstract. Rather, we algorithms in the(More)
-Sufficient conditions are given under which an adaptive control system is robustly stable and achieves a guaranteed robust asymptotic performance level equal to that of the robust controller given perfect parameter information. The conditions are general in several respects. For example, structured non-parametric uncertainty (e.g. block diagonal) is(More)
This work develops control design technology for active shape control of reflective surfaces using large spatially distributed actuator arrays. The potential applications are in astronomy, adaptive optic, beam control, space-based imaging, and other optics and imaging applications. In a very large lightweight active reflector, surface shape (figure) might(More)
The paper considers a family of linear timeinvariant and spatially-invariant (LTSI) systems that are both distributed and localized. The spatial responses of the distributed plant are localized in spatial neighborhoods of each location. The feedback computations are also distributed and the information flow is localized in a spatial neighborhood of each(More)