This article presents an analysis of how pulses in the long two-conductor coupled lines with conductor screened interact mutually. The interaction of pulses appears in those places of the line, where there is a change...
详细信息
This article presents an analysis of how pulses in the long two-conductor coupled lines with conductor screened interact mutually. The interaction of pulses appears in those places of the line, where there is a change of wave impedance causing a change in reflection coefficient for pulses moving along the line. An exemplary analysis is performed for a homogenous lossless line at its starting and terminal points. The results of analysis are analytical expressions describing quantitative interactions of pulses. The expressions are verified both by computer simulation and by measurements of the real line. There has been performed the analysis of influence of the resistances with which the terminal points of the line are loaded onto the amplitude value of the pulses registered at the starting point of the line. The new method and the new system of measurements of pulses have been proposed that minimize the interaction of pulses at the starting point of the line, disadvantageous for the process of fault location by using pulse method.
The paper presents regulation characteristics that fulfill the requirements of highest possible efficiency and strongly reduced torque ripple level. For switched reluctance motors it is not so simple and obvious, beca...
详细信息
The paper presents regulation characteristics that fulfill the requirements of highest possible efficiency and strongly reduced torque ripple level. For switched reluctance motors it is not so simple and obvious, because the regulation characteristics depend on three variables: phase voltage, switch-on and switch-off angles. For this reason in a steady state the same operation point (Tl, ω) of the mechanical characteristic is attainable for quite different values of those control parameters. So there is a field for quasi-optimal operation and the choice of the coresponding control parameters is the main subject of this work. The paper presents also the method to determine these quasi-optimal control characteristics from simple tests or from computations based on presented simple mathematical model.
The new LMI based method for robust stability analysis for linear uncertain system with PID controller is proposed. The general constrained structure of controller matrix is considered appropriate for both output feed...
详细信息
The new LMI based method for robust stability analysis for linear uncertain system with PID controller is proposed. The general constrained structure of controller matrix is considered appropriate for both output feedback and decentralized control and the respective guaranteed cost control design scheme is presented. The sufficient robust stability condition is developed for extended quadratic performance index including first derivative of the state vector to damp oscillations. The obtained stability condition is formulated for parameter-dependent Lyapunov function.
This paper considers the design of robust servo system for accurate tracking of complex referent signals in the presence of internal and external disturbances. Discrete-time sliding mode tracking controller is employe...
详细信息
This paper considers the design of robust servo system for accurate tracking of complex referent signals in the presence of internal and external disturbances. Discrete-time sliding mode tracking controller is employed in servo-system design. In order to improve tracking accuracy, application of active disturbance estimator is suggested. The same sliding mode controller, designed for reference tracking of nominal system, is identically implemented in the control subsystem within the estimator. The overall servo-system exhibits high tracking accuracy under action of parameter uncertainties and external disturbances. Experimental results confirm the effectiveness of the proposed servo-system structure
Fuzzy model identification of a system can be performed either by subjective or objective methods. Subjective methods assume the describing of system operation in statements of type If...Then... and their summarizatio...
详细信息
Fuzzy model identification of a system can be performed either by subjective or objective methods. Subjective methods assume the describing of system operation in statements of type If...Then... and their summarization in a fuzzy relation. The objective methods are performed in an experimental approach. The second class is a common one and assumes fuzzy model identification without an expert. This presumes an estimation algorithm for the fuzzy relation of a system based on an input-output data set. The paper presents an approach for identification of fuzzy relation based on square prediction error minimization and the results achieved through simulation on the Box-Jenkins data set
The constrained control of triple integrator based on the modes decomposition is introduced in this paper. The design combines the well known time optimal control with the linear pole assignment control, i.e. the cont...
详细信息
The constrained control of triple integrator based on the modes decomposition is introduced in this paper. The design combines the well known time optimal control with the linear pole assignment control, i.e. the control consist of n phases similar to the time optimal control, however the transients between these phases are "smooth" and the dynamics of the transients is given by the closed loop poles
The models of biological or technical applications are generally represented by nonlinear systems. Moreover these systems contain uncertain or unknown parameters. These uncertainties are reasons for some numerical and...
详细信息
The models of biological or technical applications are generally represented by nonlinear systems. Moreover these systems contain uncertain or unknown parameters. These uncertainties are reasons for some numerical and analytical problems in finding guaranteed bounds for the solution of the state space representation. Unfortunately several industrial applications are demanding exactly these guaranteed bounds in order to fulfill regulations set by the state authorities. To get an idea of the solution of systems with uncertainties the numerical integration of the systems differential equations has to be done with random selected values of the unknown parameters. This computation is done several times, in some circumstances more than thousand times, to cover the interval of the uncertain parameters. This approach is well known as the Monte-Carlo method, but this stochastic approach cannot deliver guaranteed bounds. Thus, we developed a novel method to find guaranteed bounds, which is using linear Lyapunov-like functions to solve this problem. In this scope, we improved this method to get the best bounds, which the approach with linear Lyapunov-like functions can provide. The results can be used as an initial interval for further methods based on interval arithmetic. We achieve guaranteed and finite simulation bounds as a result of our approach. The idea is to find an auxiliary function, which helps to bind the state variables. An example from an industrial application and its simulation results conclude the paper
The main objective of this paper is to develop a simulator for powered wheelchair which permits to implement different control and motion planning strategies in order to study their performance and to compare them. In...
详细信息
The main objective of this paper is to develop a simulator for powered wheelchair which permits to implement different control and motion planning strategies in order to study their performance and to compare them. In simulation the wheelchair can easily be integrated in any desired environment and the algorithm under test can be implemented and tested in this virtual environment. The paper presents firstly a brief description of a general powered wheelchair, then a control algorithm for a powered wheelchair is discussed based on the position of the wheelchair rather than its velocities. A general algorithm for motion planning and obstacle avoidance is briefly talked. This algorithm calculates the next desired position based on the actual and desired final position of the wheelchair and the obstacle position, motion direction and velocity. The next desired position is then fed to the control unit which executes the command. Some simulation results will be finally presented based on existing techniques like the virtual force field technique and the vector field histogram method
The paper deals with the frequency domain robust decentralized controller design technique for continuous-time uncertain systems given as a set of transfer function matrices. By applying the independent designs to ind...
详细信息
Robots are complex mechatronics systems where several electric drives are employed to control the movement of articulated structures. In industrial environments they must perform tasks with rapidity and accuracy in or...
详细信息
暂无评论