the paper deals with a study of model predictive control applied to three-phase Permanent Magnet Synchronous Motors (PMSM). these motors are used in drives of robots and machine tools. the construction of their model ...
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the paper deals with a study of model predictive control applied to three-phase Permanent Magnet Synchronous Motors (PMSM). these motors are used in drives of robots and machine tools. the construction of their model is discussed here with respect to a model-based control design. the model is composed via mathematical-physical analysis. the analysis is outlined in the main theoretical points. the predictive control is explained as a promising alternative to standard solution based on vector cascade control. In predictive control design, the quadratic criterion, equations of predictions and specific square-root optimization procedure are explained. the proposed solution is illustrated by several simulation examples and compared with data records of real experiment of vector control.
this paper considers the design of observers for a class of continuous and discrete-time nonlinear systems presented by Takagi-Sugeno (T-S) model with nonlinear subsystems and unmeasurable premise variables. As a resu...
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this paper considers the design of observers for a class of continuous and discrete-time nonlinear systems presented by Takagi-Sugeno (T-S) model with nonlinear subsystems and unmeasurable premise variables. As a result, the proposed T-S structure reduces the number of rules in the Sugeno model by using local nonlinear rules. Moreover, it can represent larger class of nonlinear systems as compared to the measurable premise variable case. the proposed observer guarantees exponential convergence of state estimation error by Lyapunov stability analysis and linear matrix inequality (LMI) formulation. Numerical examples illustrate effectiveness of the proposed method.
Livelong education in electro-mechanical industry is increasingly important as it allows practicing engineers and technicians to gain the knowledge necessary to cope withthe fast development and consequently with hig...
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Livelong education in electro-mechanical industry is increasingly important as it allows practicing engineers and technicians to gain the knowledge necessary to cope withthe fast development and consequently with higher demands on their workplaces. this paper addresses different aspects of development and execution of such industrial training. Concrete solutions and results are presented including: (1) extensive international knowledge needs analysis in electro-mechanical sector, (2) e-learning solutions for industry including learning management systems and application of remote working stations/experiments for practical part of the training and (3) examples of the training modules from robotics developed for industry. Applied solutions and education methodology is evaluated by feedback obtained from the training participants. Based on a gained experience a long-term perspective and possible further development direction of modern industrial education is also addressed.
In this paper, a model reference adaptive system (MRAS) approach is applied for estimating the armature position in electromagnetic actuators. Two different MRAS strategies are carried out. the first applies a Lyapuno...
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In this paper, a model reference adaptive system (MRAS) approach is applied for estimating the armature position in electromagnetic actuators. Two different MRAS strategies are carried out. the first applies a Lyapunov approach in order to derive the adaptation law, the second uses hyperstability theory. the results are compared to a state-of-the-art position estimation method, and the MRAS approach shows better performance, in particular at higher speed. Some problems in regard to the hyperstability approach are analyzed as well, and the next steps towards a robust and practical feasible approach are addressed.
the paper proposes a carrier synchronization procedure for high-order QAM modulated signals that uses a decision-directed extended Kalman filtering (EKF) technique. the proposed method combines the Kalman filter with ...
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the paper proposes a carrier synchronization procedure for high-order QAM modulated signals that uses a decision-directed extended Kalman filtering (EKF) technique. the proposed method combines the Kalman filter with a lock detector to establish the status of the synchronization process, modifying adaptively the Kalman filter parameters. As compared withthe complete EKF filter, the proposed synchronization algorithm simplifies the Kalman measurement model to a single scalar equation reducing significantly the computational complexity of the algorithm. Simulations show that the simplified Kalman algorithm has equivalent synchronization performances withthe complete EKF filter.
In the paper, a variant of the genetic algorithm for finding the location and size of small holes is considered. Both linear and non-linear elliptic boundary value problems are introduced in two domains withthe condi...
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In the paper, a variant of the genetic algorithm for finding the location and size of small holes is considered. Both linear and non-linear elliptic boundary value problems are introduced in two domains withthe conditions of transmission on the common boundary. the expansion of the shape functional for non-linear part and the expansion of Steklov-Poincare operator for linear part are provided in order to determine the form of topological derivative for the coupled model. the value of topological derivative is used for computing the probability density applied later in generating location of holes for genetic algorithm.
Dealing withthe strict analytic modelling of non-homogeneous physical objects (strings, beams etc.) control leads to the trigonometric non-Fourier moment problem. the existence of solution of such a problem is still ...
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Dealing withthe strict analytic modelling of non-homogeneous physical objects (strings, beams etc.) control leads to the trigonometric non-Fourier moment problem. the existence of solution of such a problem is still researched by many authors. the optimization of the solution is yet another problem. In current note, the algorithm for the solution withthe least L 2 -norm is developed. the proposed algorithm allows to change an infinite system of moment equations into the linear one with only a finite number of equations. the idea of the approximating algorithm is based on the concept of quadratically close Hilbert spaces. this concept is the key point of approximation of optimal control. the note is concluded withthe application of the proposed algorithm.
A well-known reactive motion planning technique, the dynamic window approach (DWA) provides an elegant way to navigate safely in the presence of obstacles, also taking the dynamic properties of the robot into account....
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A well-known reactive motion planning technique, the dynamic window approach (DWA) provides an elegant way to navigate safely in the presence of obstacles, also taking the dynamic properties of the robot into account. Most of the DWA-based methods have the same limitation, namely they use an objective function consisting of weighted terms. Different situations require different weights, however, there is no algorithm for choosing them. this paper presents a global dynamic window-based navigation scheme using model predictive control and having no weighted objective function. Former DWA-based methods take dynamic limitations of the robot by acceleration constraints into account. In contrast withthat, the proposed approach utilizes a dynamic motion model of the robot.
the paper deals with a set of the mathematical algorithms for a time parameterization of the motion paths of the machine tools. the key descriptors of the paths follow from CAD documentation, technical drawings or fro...
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the paper deals with a set of the mathematical algorithms for a time parameterization of the motion paths of the machine tools. the key descriptors of the paths follow from CAD documentation, technical drawings or from technological demands. the presented algorithms provide a time mapping of individual path coordinates. the algorithms are based on the kinematical relations and on analytical geometry in space. they work with position, velocity, acceleration and jerk quantities. All algorithms are implemented in a path simulator, which was developed as a user friendly utility windows application. the described mathematical principles are demonstrated by several testing motion paths.
this paper describes how to apply a group of alternative methodologies to the modeling and simulation of a three phase rectifier. the system is a full bridge rectifier with RC load, that consist of diodes that are mod...
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this paper describes how to apply a group of alternative methodologies to the modeling and simulation of a three phase rectifier. the system is a full bridge rectifier with RC load, that consist of diodes that are modeled withthe accurate and close-to-real constituve relation of Shockley. this constitutive relation bring an unvariable topology and a non linear nature to the whole system. the emerging non linearities are handled withthe described methodologies, and a procedure to formulate differential-algebraic equations (DAE) is reviewed. the obtained DAE is numerically solved and simulation results are presented. In order to prove the significance of the modeling and simulation approach, non standard conditions, such as unbalanced sources are included.
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