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• Shi, Jianjun With the advances made in computer technology and efficiency of numerical algorithms over last decade, the MPC strategies have become quite popular among control community. However, application of MPC or GPC to flexible space structure control has not been explored adequately in the literature. The work presented in this thesis primarily focuses on application of GPC to control of nonlinear flexible space structures. This thesis is particularly devoted to the development of various approximate dynamic models, design and assessment of candidate controllers, and extensive numerical simulations for a realistic multibody flexible spacecraft, namely, Jupiter Icy Moons Orbiter (JIMO)---a Prometheus class of spacecraft proposed by NASA for deep space exploratory missions. A stable GPC algorithm is developed for Multi-Input-Multi-Output (MIMO) systems.

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An end-point weighting (penalty) is used in the GPC cost function to guarantee the nominal stability of the closed-loop system. A method is given to compute the desired end-point state from the desired output trajectory. The methodologies based on Fake Algebraic Riccati Equation (FARE) and constrained nonlinear optimization, are developed for synthesis of state weighting matrix. This makes this formulation more practical.

A stable reconfigurable GPC architecture is presented and its effectiveness is demonstrated on both aircraft as well as spacecraft model. A representative in-orbit maneuver is used for assessing the performance of various control strategies using various design models. Different approximate dynamic models used for analysis include linear single body flexible structure, nonlinear single body flexible structure, and nonlinear multibody flexible structure. The control laws evaluated include traditional GPC, feedback linearization-based GPC (FLGPC), reconfigurable GPC, and nonlinear dissipative control.

These various control schemes are evaluated for robust stability and robust performance in the presence of • Elfatih G. HAMDI 2015-06-01 Full Text Available The performance and dynamic stability issues of flight control systems are still considered one of the most challenging design problems even though all of significant advances that have been happened in UAVs in the two last decades. This paper is devoted to design a flight control system to stabilize the attitude of small UAV against additive uncertainties. Toward this objective, structured robust control framework is considered. The design procedure is performed using two control configurations: The single degree of freedom (SDOF controller is considered and then followed by the two degree of freedom (TDOF controller to achieve some advantages.

In SDOF configuration the entire set of all stabilizing controllers are, graphically, computed and then the controller parameter are, arbitrary, selected. A trade-off between designs requirements in SDOF controller determines the use of the TDOF controller. Therefore, the obtained parameters from SDOF controller are taken as initial guess and tuned using TDOF decentralized control to achieve the pre-determined performance specifications, while guarantee pre-determined robust stability. The obtained results clarify the ability of the designed controller to achieve an adequate level of stability and performance properties. • Muhamed Turkanovic 2015-02-01 Full Text Available Today’s databases store information with sensitivity levels that range from public to highly sensitive, hence ensuring confidentiality can be highly important, but also requires costly control. This paper focuses on the inference problem on different database structures. It presents possible treats on privacy with relation to the inference, and control methods for mitigating these treats.

The paper shows that using only access control, without any inference control is inadequate, since these models are unable to protect against indirect data access. Furthermore, it covers new inference problems which rise from the dimensions of new technologies like XML, semantics, etc. 1978-01-01 The novel idea presented is based on the observation that if a structure is controlled by distributed systems of sensors and actuators with limited authority, i.e., if the controller is allowed to modify only moderately the natural modes and frequencies of the structure, then it should be possible to apply root perturbation techniques to predict analytically the behavior of the total system.

Attention is given to the root perturbation formula first derived by Jacobi for infinitesimal perturbations which neglect the induced eigenvector perturbation, a more general form of Jacobi's formula, first-order structural equations and modal state vectors, state-space equations for damper-augmented structures, and modal damping prediction formulas. • Kiriazov, P. [Bulgarian Academy of Sciences, Sofia (Bulgaria). Of Mechanics 1998-10-01 This study is addressed to design problems of controlled mechanical structures (CMS) like robot manipulators and engineering systems with active vibration control that may be subject to arbitrary disturbances. Along with the basic design requirement for strength/load capacity, additional design criteria for CMS are needed to meet the continuously increasing demands for faster response, improved precision and reduced energy consumption.

As a CMS is a functionally directed assembly of mutually influencing components: control, actuator, mechanical, and sensor subsystems, a conceptual framework for their integrated design is required. Parameters of these subsystems influencing the dynamic performance of CMS define a matrix that transfers the control inputs into the controlled outputs (accelerations). This transfer matrix plays the key role in the integrated structure-control design. We consider the design optimization problem for CMS having decentralized control architecture. An integrated design criterion for such systems is proposed which is based on optimal trade-off relations between bounds of model uncertainties and control force limits. Optimizing this criterion leads to CMS with maximum degree of robustness. The approach proposed makes it possible a decomposition of the overall design problem into design problems for the CMS`s components.

The design concepts are applied to the mechanical subsystem of planar linkage systems. Robust decentralized controllers are designed for a two-degree-of-freedom manipulator with elastic joints. (orig.) • Brown, Ari D.; Chuss, David T.; Chervenak, James A.; Henry, Ross M.; Moseley, s. Harvey; Wollack, Edward J.

2010-01-01 We have designed, fabricated, and tested compact radiative control structures, including antireflection coatings and resonant absorbers, for millimeter through submillimeter wave astronomy. The antireflection coatings consist of micromachined single crystal silicon dielectric sub-wavelength honeycombs. The effective dielectric constant of the structures is set by the honeycomb cell geometry. The resonant absorbers consist of pieces of solid single crystal silicon substrate and thin phosphorus implanted regions whose sheet resistance is tailored to maximize absorption by the structure.

We present an implantation model that can be used to predict the ion energy and dose required for obtaining a target implan