Power systems form one of the largest and most complex technical systems. Changes of load parameters may lead to so called bifurcations, resulting in nonlinear phenomena like voltage collapse or interarea oscillations...
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Power systems form one of the largest and most complex technical systems. Changes of load parameters may lead to so called bifurcations, resulting in nonlinear phenomena like voltage collapse or interarea oscillations. Special software tools are able to simulate these systems and to identify bifurcations. This paper presents a systematic approach to determine gain factors of Flexible AC Transmission Devices (FACTS) considering changes of load parameters. This approach is applied to two different power system models.
The problem of model-based condition monitoring of aero gas turbine engines is considered. Genetic algorithms are applied for the dynamic modelling of aero engines by estimating parameters of the linear reduced-order ...
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The problem of model-based condition monitoring of aero gas turbine engines is considered. Genetic algorithms are applied for the dynamic modelling of aero engines by estimating parameters of the linear reduced-order model. The use of genetic algorithms affords flexibility in the choice of performance metrics. Real engine data is used to investigate the performance genetic algorithms and this approach is compared with traditional modelling techniques used in industry.
In this paper, robotic sensor fusion of acceleration and force measurement is considered. We discuss the problem of using accelerometers close to the end-effectors of robotic manipulators and how it may improve the fo...
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ISBN:
(纸本)0780384636
In this paper, robotic sensor fusion of acceleration and force measurement is considered. We discuss the problem of using accelerometers close to the end-effectors of robotic manipulators and how it may improve the force control performance. We introduce a new model-based observer approach to sensor fusion of information from various different sensors. During contact transition, accelerometers and force sensors play a very important role and it can overcome many of the difficulties of uncertain models and unknown environments, which limit the domain of application of currents robots used without external sensory feedback. A model of the robot-grinding tool using the new sensors was obtained by system identification. An impedance control scheme was proposed to verify the improvement. The experiments were carried out on an ABB industrial robot with open controlsystem architecture.
The problem of flight clearance of linear stability requirements in the complete flight envelope is studied. The approach is to use μ-analysis of linear fractional transformations description of the systems dynamics ...
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ISBN:
(纸本)1563476703
The problem of flight clearance of linear stability requirements in the complete flight envelope is studied. The approach is to use μ-analysis of linear fractional transformations description of the systems dynamics augmented with an uncertainty model of the clearance criteria. Two methods to derive the linear fractional transformations are used and compared: the Trends and Bands method and rational approximations. The two approaches are applied to a DAY demonstrator model. The resulting models are analyzed by μ-sensitivities in order to demonstrate how this can be used to reduce the order of the linear fractional transformations description. A number of algorithms to compute upper and lower bounds on n are also compared. Results from applying the clearance criteria to the UAV demonstrator model are given.
Two novel linear matrix inequality (LMI) based procedures to receive a stabilizing robust output feedback gain are presented, one of them being a modification of previous results of OLIVEIRA et al., [5]. The proposed ...
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Two novel linear matrix inequality (LMI) based procedures to receive a stabilizing robust output feedback gain are presented, one of them being a modification of previous results of OLIVEIRA et al., [5]. The proposed robust control law stabilizes the respective uncertain discrete-time system described by a polytopic model with guaranteed cost. The obtained results are compared with other LMI results from literature and illustrated on an example.
In this paper an application of genetic algorithms for on-line multi-objective optimisation is considered. Two different multi-objective evolutionary computational techniques are implemented for optimal selection of g...
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In this paper an application of genetic algorithms for on-line multi-objective optimisation is considered. Two different multi-objective evolutionary computational techniques are implemented for optimal selection of gas turbine engine real-time model structure. The real engine data was used for identification and optimisation of the engine model parameters. The results of genetic algorithm application for engine model on-line optimisation are discussed.
This study is an effort to give a practical solution in the problem of optimizing the structure of the Hierarchical Mixture of Experts model, which is a natural extension of the Associative Gaussian Mixture of Experts...
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ISBN:
(纸本)0780382781
This study is an effort to give a practical solution in the problem of optimizing the structure of the Hierarchical Mixture of Experts model, which is a natural extension of the Associative Gaussian Mixture of Experts system. We present two novel methods for optimizing such structures using Genetic Algorithms. Special concern is taken for reducing the computational time so as to efficiently allow the structure to "grow" while it evolves with the Genetic Algorithm. The main contribution of the paper lies on the efficient, topologically oriented, representations of such architectures so as to be optimized through involving genetic algorithms.
The main characteristic of the walking robots is that they are able to move away on not arranged, horizontal and rough terrain. The movement of the walking robots can be divided in two modes: - under condition of the ...
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The main characteristic of the walking robots is that they are able to move away on not arranged, horizontal and rough terrain. The movement of the walking robots can be divided in two modes: - under condition of the static stability, - under condition of the dynamic stability. The loss of static or quasi-static stability may be produced in two cases, namely: - the vertical projection of the gravity center is out of support polygon, - one or more tangential components of reaction forces from support points are greater than the friction forces. The movement of the walking robot under dynamical stability conditions may be realized when the forward average speed is greater than a certain limit. In the work are analyzed the possibilities of determination of the limit conditions for the stable displacement of the quadrupedal walking robots.
The problem of robust output feedback stabilization is studied. The new robust stability LMI condition including guaranteed cost and the respective simple control design procedure is developed. Though the proposed con...
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Assembly and disassembly tasks are examples of "unfriendly" operations for humans. This paper presents research efforts in order to improve the operations of mobile structures for difficult environments. The...
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