In order to avoid exhaustive optimizations in the process of the extraction of fuzzy rules from data, we have developed a method for automated generation of fuzzy rules based on the techniques of machine learning. The...
详细信息
In order to avoid exhaustive optimizations in the process of the extraction of fuzzy rules from data, we have developed a method for automated generation of fuzzy rules based on the techniques of machine learning. The idea behind it is to approximate fuzzy sets with crisp sets and afterwards to apply inductive learning over crisp sets. Experiments which indicate the properties of the method are presented and guidelines for its optimal usage are given. Finally, the method has been applied to the model of a real process.
A simple review of anti-windup, bumpless and conditioned transfer techniques is given in the framework of the PID controller. It will be shown that the most suitable anti-windup strategy for usual applications is the ...
详细信息
A simple review of anti-windup, bumpless and conditioned transfer techniques is given in the framework of the PID controller. It will be shown that the most suitable anti-windup strategy for usual applications is the conditioning technique. The new notion of conditioned transfer is also introduced, and it will be indicated that conditioned transfer is a more suitable solution than bumpless transfer.
This paper discusses the robust detection filter design problem when geometric methods for decoupling the failure modes from modelling uncertainties and exogeneous deterministic disturbances are not available. Fundame...
详细信息
This paper discusses the robust detection filter design problem when geometric methods for decoupling the failure modes from modelling uncertainties and exogeneous deterministic disturbances are not available. Fundamental solutions of the H∞ detection filter problem are reviewed. Two basic design methods related to two basic worst-case modelling approaches which require the solution of one or two Riccati equations, respectively, are compared to each other. Despite different posing of the problems both alternatives may guarantee robustness against modelling uncertainties and external disturbances with respect to a particular failure mode thus improving filter sensitivity to faults.
In batch pulp cooking the heating steam is used only in some phases of the technological procedure. This causes large variations in steam now-rate and imposes high dynamic load at the steam generation plant. In the pa...
详细信息
In batch pulp cooking the heating steam is used only in some phases of the technological procedure. This causes large variations in steam now-rate and imposes high dynamic load at the steam generation plant. In the paper,a system for smooth steam consumption control is presented. It is based on three multiloop microprocessor-based controllers. The designed control structure is simple enough to be implemented as a stand-alone small-sized control system. Also, it provides a low-cost solution by eliminating the need to measure the steam now-rate on each digester. After the installation a reduction of 70% in steam now-rate variance was measured.
In this paper the structural controllability and observability of heat exchanger networks are determined from qualitative information about the heat exchangers and their network topology. The heat exchanger network is...
详细信息
In this paper the structural controllability and observability of heat exchanger networks are determined from qualitative information about the heat exchangers and their network topology. The heat exchanger network is modelled as a time-varying linear system based on first engineering principles where the effect of the flowrate variations is described by unknown time-varying parameters, inlet temperature variations are regarded as disturbances and external heaters/coolers are considered as input variables. Necessary and sufficient conditions for structural controllability and observability of heat exchanger networks are derived, based on an extended Kalman-type rank criterion for linear systems with time-varying parameters. Determining the structural controllability and observability of heat exchanger networks needs only checks for the input and output connectability of the network in both constant and time-varying parameter cases. The results are extended to the more-practical case where bypass ratios are also used as control variables and where more than one time-varying parameter enters into the state-space matrices.
A new pattern recognition procedure is introduced for the automatic detection of K-complexes in EEG sleep polygraphies employing fuzzy logic and neural networks. The developed detection system was implemented in C, su...
详细信息
A new pattern recognition procedure is introduced for the automatic detection of K-complexes in EEG sleep polygraphies employing fuzzy logic and neural networks. The developed detection system was implemented in C, supplying a hardware-independent solution with a very rapid recognition of the K-complexes. With the aid of the determined K-complexes and detected sleep spindles, the respective stage 2 in the sleep polygraphy can be evaluated directly from the EEG signal and visualized. This represents a significant criterion for the objective assessment of a patient's sleep quality.
The robust stability and performance of a binary distillation column model is analysed using a minimal state space representation. The uncertainty modelling of the column is resulted in an LFT form with a four element...
详细信息
The robust stability and performance of a binary distillation column model is analysed using a minimal state space representation. The uncertainty modelling of the column is resulted in an LFT form with a four element diagonal block structure taking into account the dependence between the steady state gains. Robust analysis of the distillation column dynamics is performed and compared using µ - and l 1 -analysis tools. The magnitude of possible overshoots is determined by l 1 -test for robust performance and the dependence of this magnitude on the dominant time constant (i.e. the purity of the separation) is investigated. Futhermore the effect of the mi certainties in the time constants and the singular values on the robust performance is also analysed using l 1 -test. It has been found that the uncertainty in the time constants affects dominantly the robust performance of the open-loop system, i.e. the magnitude of possible overshoots.
A new technique for control system design based on the Optimal Constrained Covariance control (OC 3 ) is presented. A design procedure of control system for dynamic ship positioning is proposed. In the papers publishe...
详细信息
A new technique for control system design based on the Optimal Constrained Covariance control (OC 3 ) is presented. A design procedure of control system for dynamic ship positioning is proposed. In the papers published so far the controller gain matrices were detennined using the classical Linear Quadratic Gaussian (LQG) optimal control technique, the pole-placement technique and characteristic locus design method. The main disadvantage of these techniques is their poor correspondence with the real performance requirements of control system. Using the proposed technique this disadvantage is avoided. The results of computer simulation using OC 3 control are presented.
Passivity based controllers are used in structural control due to their inherent robustness properties. These controllers require sensor/actuator collocation. In this paper, we consider the design of a "squaring ...
详细信息
Passivity based controllers are used in structural control due to their inherent robustness properties. These controllers require sensor/actuator collocation. In this paper, we consider the design of a "squaring down" matrix which renders a system passive by using a linear combination of all collocated and non-collocated sensor/actuator pairs. The design uses experimental transfer functions and does not require the knowledge of the system model. The problem of finding the squaring down matrix is cast as a solution to a set of linear matrix inequalities (LMIs) subject to some additional performance considerations. The design procedure of the squaring down matrix assumes that velocity information is available from the sensors which is not generally the case. We show that the squaring down matrix can be implemented without the use of such velocity information. We provide experimental results gathered from the single link flexible beam setup in the C/sub La/MS laboratory at RPI to show that implementation of passive loops without velocity measurements provides very good results.
Smart materials such as piezoceramics and shape memory alloys (SMAs) exhibit significant hysteresis and in order to estimate the effect on open and closed loop control a suitable model is needed. One promising candida...
详细信息
Smart materials such as piezoceramics and shape memory alloys (SMAs) exhibit significant hysteresis and in order to estimate the effect on open and closed loop control a suitable model is needed. One promising candidate is the Preisach independent domain hysteresis model that is characterized by the congruent minor loop and wiping out properties. Comparable minor loop and decaying oscillation test data for a multi-sheet piezoceramic actuator (made of lead zirconate titanate) attached to a flexible beam are presented and are seen to be very consistent with the two Preisach model properties. The commanded parameter is the sheet transverse electric field while the measured parameter is an approximately colocated strain induced in the beam. Equivalent data for a Nitinol SMA wire muscle, attached to the same beam, are also presented. The input and output parameters are the SMA current and a beam strain respectfully. The minor loop and wiping out evidence is less strong than that of the piezoceramic case, but encouraging. In all experiments the quasi-steady state responses were generated in order to avoid exciting beam flexible modes which would complicate the analysis.
暂无评论