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This work investigates the problem of dynamic, intra-query load balancing in parallel database queries across heterogeneous nodes in a way that takes into account the inherent cost of adaptations and thus avoids both over-reacting and deciding when to adapt in a completely heuristic manner. The latter may lead to serious performance degradation in several cases, such as periodic and random imbalances...
In this paper the dynamic optimal toll design problem as a game of the Stackelberg type is investigated, with the road authority as leader and drivers on the road network as followers. The road authority sets dynamic traffic-flow dependent tolls on some links in order to minimize its objective function, while the drivers choose their routes and departure times so as to minimize their own perceived...
This paper presents an H2-norm optimal control scheme for the three main axes of an overhead travelling crane, which guarantees both tracking of desired trajectories for the crane load and an active damping of crane load oscillations. For the model-based feedback control design series expansions are utilised to obtain an approximate solution of the corresponding Hamilton-Jacobi-Bellmann-equation....
For the purpose of generating a standardized environment to test scheduling solvers on scheduling problems and to rank the results in comparison to other solvers, a simulation-based framework for a dynamic resource allocation test bed is proposed and realized. Our focus is on multiple-machine problem formulations, predictable dynamics, event based control and especially their combination. The framework...
In this paper, a phenomenological model of clutch torque transmissibility is proposed. This model applies to clutch engagement during vehicle start-up in both manual and automated-manual configurations. The proposed model can be identified through on board measurements available in most production vehicles. The model is based on the identification of a nonlinear characteristic that relates the transmissibility...
Load frequency control (LFC) issue has been one of the major subjects in electric power system operation and design. Nowadays, it is becoming much more significant in accordance to increasing size, changing structure and complexity of interconnected power systems. In this paper, a new decentralized self-tuning pole placement control technique is proposed as an appropriate strategy for load frequency...
In this paper, the pitch angle control design problem of wind turbine generator is considered. Dynamic characteristics of wind turbine system vary according to the wind speed and also the generator speed. But it is required to maintain the generator speed at the optimal one in spite of such variations. For this purpose, the pitch angle control of wind turbine which includes the robust stability performance...
In this study, an adaptive control scheme is designed for vibration isolation of SDOF structural system using a semi-active MR (magnetorheological) damper. The main goal of using a MR damper system is for structural protection against earthquake excitation and wind loading. A structural system excited by an earthquake and controlled by using MR damper is modeled as a semi-active controlled, seismically...
An approach for statistical and reliability analyses of concrete structures is presented. It describes the virtual simulation used on the way from assessment of experimental results to reliability analysis. The whole approach is based on randomization of nonlinear fracture mechanics finite element analysis of concrete structures. Efficient techniques of both nonlinear numerical analysis of concrete...
In this paper we illustrate the development of ldquoadd-onrdquo control schemes for vehicle applications based on reference governors and specially formulated model predictive controllers. These schemes are normally inactive but become active when necessary to enforce pointwise-in-time constraints on vehicle variables and assist the driver in maintaining control of the vehicle. A specific case study...
This paper presents an LMI (linear matrix inequality) approach to obtain an optimal controller, for a coal-fired power plant. This is an alternative and an extension of the results obtained. The objective considered is a fast tracking of load step changes while keeping the pressure variations constrained. Also a constraint on the control inputs, introducing a new LMI constraint, is taken into account...
Under certain conditions the payload oscillation inherent to all crane systems cannot be described by a single-pendulum but shows a double-pendulum like behavior. In that case anti-sway concepts have to be adapted to the new system. For the here given application case the rope angles of the double-pendulum have to be reconstructed out of gyroscope signals, in order to make the full state information...
A robust Hinfin controller design in an LMI framework has been carried out for a load-frequency control problem of a single-area uncertain power system model. For carrying out this design, the uncertainties have been restructured by considering norm-bounded uncertainty instead of rank-1 uncertainty structure of . The proposed design is simple and can be easily solved to obtain optimal values of the...
This paper presents the control strategy of a fossil-fuel power plant. In previous work, an advanced coordinated controller was synthesized to achieve stability with satisfying performances. This controller was implemented on-site leading to satisfactory results. However, mainly because of modeling uncertainties, the obtained performances could be non-optimal, with the risk of non-satisfaction of...
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