The descriptions of innovative methods for preliminary data processing in a system for measuring of radial clearances, including the difference method for average extreme codes detection of blade-to-blade gaps, the di...
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ISBN:
(纸本)9781728167008
The descriptions of innovative methods for preliminary data processing in a system for measuring of radial clearances, including the difference method for average extreme codes detection of blade-to-blade gaps, the difference method for extreme codes detection at the output of measuring circuit during one period of impeller rotation that is not dependent on temperature effect on the sensor, and the method for averaging of difference of extreme codes over several periods of impeller rotation, are considered. Methods provide processing speed and measurement accuracy increase. The quantitative estimates of methods speed and accuracy confirming their efficiency and application in gas-turbine engines diagnostic systems are given.
Designs and implementation of the controls of complex sequential systems, such as a production system, may have some difficulties since they require complicated and troublesome procedures. Among the problems of design...
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Designs and implementation of the controls of complex sequential systems, such as a production system, may have some difficulties since they require complicated and troublesome procedures. Among the problems of design are how to express the given specification and how to realize the control system from the expression are the most important problems. A graphical method is proposed using the ″mark flow graph″ for the representation of complex sequential controlsystems which contain concurrent actions. The mark flow graph can be applied effectively not only to design of hierarchy controlsystems but also to realize them directly. A description is given of the principles and characteristics of the mark flow graph and its application to the design of complex sequential controlsystems.
In the analysis of complexsystems (information systems, networks, etc.) it is necessary to detect anomalies of their states. For numerical data there are technics of profiles, regressions, etc. At supervision of non-...
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ISBN:
(纸本)9781467388184
In the analysis of complexsystems (information systems, networks, etc.) it is necessary to detect anomalies of their states. For numerical data there are technics of profiles, regressions, etc. At supervision of non-numerical data arises problems of determination of anomalies, and also problems of identification of anomalies. Rather universal model of the analysis of anomalies is given in the paper. Conditions when detection of anomalies in the conditions of the analysis of the simplified model of real system allows to identify anomalies in the real system are received.
This paper discusses the problems of constructing a basis for two-dimensional stochastic functions, which are samples of random numbers with a given distribution law. The algorithm for constructing an approximation mo...
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ISBN:
(纸本)9781728167008
This paper discusses the problems of constructing a basis for two-dimensional stochastic functions, which are samples of random numbers with a given distribution law. The algorithm for constructing an approximation model with the use of this basis is described. The general algorithm for two-dimensional signal recovery using the stochastic basis by the least squares method with a given weight function is given. The approach to solving the problem of recovery of blurred images with a known point scattering function by constructing an inverse filter model is proposed. The approbation of the algorithms was performed on model examples and in the processing of real images obtained by remote sensing of the Earth. To quantify the quality of the recovery, we used a relative root mean square measurement of the difference between the reference and reconstructed images.
The problem of constructing a model for the development of the transport complex as a subsystem of a large-scale socio-economic system for forecasting and scenario modeling is considered. Based on the proposed model, ...
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Rapid prototyping of complexsystems and their control strategies is an important approach in system modeling, especially in early design stages. Naturally, these systems can be seen as a network of concurrently runni...
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ISBN:
(纸本)0780336461
Rapid prototyping of complexsystems and their control strategies is an important approach in system modeling, especially in early design stages. Naturally, these systems can be seen as a network of concurrently running communicating objects. A practical application field are flexible manufacturing systems (FMS) used in computer integrated manufacturing (CIM). A FMS consists of concurrently working machines which are connected by a computerized material handling system. This leads to well-known problems like scheduling and resource allocation where the usefulness of the fuzzy logic approach has been shown. Concurrent objects as a modeling paradigm enable the designer to describe the system's structure and behavior naturally on a high abstraction level. In this contribution we argue that control strategies based on complex hierarchical fuzzy rule bases fit nicely in the concurrent object based modeling view and, consequently, in a consistent design approach. Moreover, we introduce a suitable programming language (DFKI Oz), extended by a fuzzy library, which supports the described modeling approach. Validation of our approach is described by modeling a complex FMS in the field of car production.
Improvement of control system performance is important today. Modern microprocessor hardware allows to implement and put into practice complexcontrol algorithms. In many cases it is necessary to know and periodically...
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ISBN:
(纸本)9781728167008
Improvement of control system performance is important today. Modern microprocessor hardware allows to implement and put into practice complexcontrol algorithms. In many cases it is necessary to know and periodically renew the control process model. The model is usually obtained during the working process, so the way of obtaining the model must not influence the process significantly. When a control system is designed, it is important in many cases to obtain a high quality of the transient process when the system setpoint is changed. This paper considers this problem for the controlsystems for thermal processes which often have transport delay. Their properties can be also changed significantly over time. This paper considers a single loop control system equipped with a auto-tuning module, which can renew the process model and tune the controller. This module is based on a fast auto-tuning algorithm, so the influence on the process is small. Several variants of the control system for the case of setpoint changes are considered: a system with a Smith predictor and a PM-controller, a system with a command unit and a PM-controller and a hybrid system with a maximal rapid response algorithm and a PM-controller and a system with a PM-controller and a command unit. All the systems are considered taking into consideration operating limitations such as the limitations of the control action range.
Recent advances in the theory of fuzzy modeling and a number of successful real-world applications show that fuzzy models can be efficiently applied to complex nonlinear systems untractable with standard linear method...
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ISBN:
(纸本)0780324625
Recent advances in the theory of fuzzy modeling and a number of successful real-world applications show that fuzzy models can be efficiently applied to complex nonlinear systems untractable with standard linear methods. Besides the capability of modeling nonlinear systems, there are other properties that make fuzzy models interesting not only theoretically but also for the industrial practice. This paper attempts to overview various approaches to fuzzy modelling, seen from the control engineering perspective. Special attention is focused on the construction of fuzzy models from numerical data and the possibility of incorporating a priori knowledge about the system and some open problems are highlighted.
The article presents the structure of the intellectual system, which allows to estimate the ratio of the thickness of the residual refractory layer and the repair layers. The system is based on the information model o...
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ISBN:
(纸本)9781728167008
The article presents the structure of the intellectual system, which allows to estimate the ratio of the thickness of the residual refractory layer and the repair layers. The system is based on the information model of the steelmaking process. The criterion is the safe operation of the converter lining. The intellectual system is based on information support, including a database of technological process parameters, a knowledge base of safe criteria for the converter process, a database of laser scanning results, a database of hot repair type selection rules, a database of rules for displaying information about scan analysis results. Information support is configured for various modes of operation of the control object by changing the ranges of the corresponding parameters. This ensures the adaptation of the system to various modifications of the control object. Testing of the intellectual system confirmed its operability and the possibility of using the operator as an adviser for making decisions on the operation of the refractory lining of steel-making converters in metallurgical enterprises.
The paper deals with methods for comparison of digitized copies of business documents. This task arises when comparing two copies of documents signed by two parties in order to find possible modifications made by one ...
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ISBN:
(纸本)9781728167008
The paper deals with methods for comparison of digitized copies of business documents. This task arises when comparing two copies of documents signed by two parties in order to find possible modifications made by one party. For example, this task is quite actual in the banking sector when concluding contracts in paper form. The comparison method of two digitized images based on the combination of several ways of comparing the words images that are descriptors of text feature points is proposed. The proposed method is well proven on own dataset (Russian). The results show the high quality and reliability of differences search in two samples of the same document.
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