Young-Hun Lim

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This numerical study presents a detailed optimal control design based on the general finite element approach for the integrated design of a structure and its control system. Linear quadratic (LQ) theory with output feedback is considered on the basis of the state space model of the system. Three-dimensional finite elements are used to model the smart(More)
This paper studies the consensus problems under saturation constraints in interconnection states, both the componentwise and the norm bounded constraints. By utilizing the edge Laplacian and the state saturation, the networked linear systems under interconnection constraints are described by the node and constrained edge dynamics. Sufficient conditions are(More)
The finite-element method of analysis is unrestricted by size considerations and is well suited for the study of very small structures such as MEMS devices embedded in structures. This paper presents the numerical approach and results for a silicon-based micro-flow sensor for pulsed-flow sensing. The new approach presented here is the treatment of transient(More)
This paper proposes three coordination laws for optimal energy generation and distribution in energy network, which is composed of physical flow layer and cyber communication layer. The physical energy flows through the physical layer; but all the energies are coordinated to generate and flow by distributed coordination algorithms on the basis of(More)
In this paper, we consider a formation keeping problem for a satellite formation flying system. The relative motion dynamics is designed with polytopic uncertainties by considering elliptical reference orbit, noncoplarnar formation and unknown angular rate, angular acceleration within some boundary. We propose a composite nonlinear feedback control law(More)
This paper studies a load transportation problem using two and three quadcopters for outdoor applications. We construct a transportation controller, that consists of a formation controller to track a desired trajectory and a load sharing controller to share the load effects, in a distributed way. Specifically, based on the displacement-based formation and(More)
In this paper, we provide a stability analysis for linear systems which have simultaneous saturations in the states and their rates (dynamics). The stability analysis is conducted via a formulation based on the polytopic representations of two saturation functions, state and rate saturation functions. Sufficient conditions to guarantee local and global(More)