In light of the high nonlinearity of LuGre friction model, a novel method based on ant colony algorithm(ACA) for identifying the friction parameters of flight simulation servo system is proposed. ACA is a parallelized...In light of the high nonlinearity of LuGre friction model, a novel method based on ant colony algorithm(ACA) for identifying the friction parameters of flight simulation servo system is proposed. ACA is a parallelized bionic optimization algorithm inspired from the behavior of real ants, and a kind of positive feedback mechanism is adopted in ACA. On the basis of brief introduction of LuGre friction model, a method for identifying the static LuGre friction parameters and the dynamic LuGre friction parameters using ACA is derived. Finally, this new friction parameter identification scheme is applied to a electric-driven flight simulation servo system with high precision. Simulation and application results verify the feasibility and the effectiveness of the scheme. It provides a new way to identify the friction parameters of LuGre model.展开更多
As two kinds of management modes of highway tramc control, lane-control, and speed-control produce different effect under different conditions. In this paper, traffic flow cellular automaton models for four-lane highw...As two kinds of management modes of highway tramc control, lane-control, and speed-control produce different effect under different conditions. In this paper, traffic flow cellular automaton models for four-lane highway system with two opposing directions under the above two modes are established considering car and truck mixed running. Through computer numerical simulating, the fundamental diagrams with different parameters are obtained, and after the analysis of density-flux diagrams, the variation discipline of flux with traffic density under different control models is gained. The results indicate that, compared with lane-control, utilization ratio of road can be further improved with speed-control when the truck number increases. The research result is of great significance for reasonable providing theoretical guidance for highway traffic control.展开更多
A method and results of identification of wear debris using their morphological features are presented. The color images of wear debris were used as initial data. Each particle was characterized by a set of numerical ...A method and results of identification of wear debris using their morphological features are presented. The color images of wear debris were used as initial data. Each particle was characterized by a set of numerical parameters combined by its shape, color and surface texture features through a computer vision system. Those features were used as input vector of artificial neural network for wear debris identification. A radius basis function (RBF) network based model suitable for wear debris recognition was established, and its algorithm was presented in detail. Compared with traditional recognition methods, the RBF network model is faster in convergence, and higher in accuracy.展开更多
Meaning of the concept of＂makom＂ is hard to define with some frames and borders. Thus, German researcher Yu. Elzner provided more than 20 meanings of this word translated from Arabic. Music experts have decided in f...Meaning of the concept of＂makom＂ is hard to define with some frames and borders. Thus, German researcher Yu. Elzner provided more than 20 meanings of this word translated from Arabic. Music experts have decided in favor of the definition of word makom as ＂mode and genre＂. Establishment of makom as a genre had taken place approximately from 12th to 18th centuries. However, evolution of a mode system, had occurred much earlier. Makom art of Uzbekistan is a heritage, which had been formed over the long period. However, it has not yet reached its completion, it still keeps living and being filled with a new emotional mood, new image contents. Swift development of computer technology and communication means creates opportunities both for researchers and for performers to improve the phenomenon of the makom arts. Organization of various contests and festivals in Uzbekistan, makom performers＇ participation in foreign forums represents great incentives for showing the western interest in this arts and its integration into the global music science.展开更多
文摘In light of the high nonlinearity of LuGre friction model, a novel method based on ant colony algorithm(ACA) for identifying the friction parameters of flight simulation servo system is proposed. ACA is a parallelized bionic optimization algorithm inspired from the behavior of real ants, and a kind of positive feedback mechanism is adopted in ACA. On the basis of brief introduction of LuGre friction model, a method for identifying the static LuGre friction parameters and the dynamic LuGre friction parameters using ACA is derived. Finally, this new friction parameter identification scheme is applied to a electric-driven flight simulation servo system with high precision. Simulation and application results verify the feasibility and the effectiveness of the scheme. It provides a new way to identify the friction parameters of LuGre model.
文摘As two kinds of management modes of highway tramc control, lane-control, and speed-control produce different effect under different conditions. In this paper, traffic flow cellular automaton models for four-lane highway system with two opposing directions under the above two modes are established considering car and truck mixed running. Through computer numerical simulating, the fundamental diagrams with different parameters are obtained, and after the analysis of density-flux diagrams, the variation discipline of flux with traffic density under different control models is gained. The results indicate that, compared with lane-control, utilization ratio of road can be further improved with speed-control when the truck number increases. The research result is of great significance for reasonable providing theoretical guidance for highway traffic control.
文摘A method and results of identification of wear debris using their morphological features are presented. The color images of wear debris were used as initial data. Each particle was characterized by a set of numerical parameters combined by its shape, color and surface texture features through a computer vision system. Those features were used as input vector of artificial neural network for wear debris identification. A radius basis function (RBF) network based model suitable for wear debris recognition was established, and its algorithm was presented in detail. Compared with traditional recognition methods, the RBF network model is faster in convergence, and higher in accuracy.
文摘Meaning of the concept of＂makom＂ is hard to define with some frames and borders. Thus, German researcher Yu. Elzner provided more than 20 meanings of this word translated from Arabic. Music experts have decided in favor of the definition of word makom as ＂mode and genre＂. Establishment of makom as a genre had taken place approximately from 12th to 18th centuries. However, evolution of a mode system, had occurred much earlier. Makom art of Uzbekistan is a heritage, which had been formed over the long period. However, it has not yet reached its completion, it still keeps living and being filled with a new emotional mood, new image contents. Swift development of computer technology and communication means creates opportunities both for researchers and for performers to improve the phenomenon of the makom arts. Organization of various contests and festivals in Uzbekistan, makom performers＇ participation in foreign forums represents great incentives for showing the western interest in this arts and its integration into the global music science.
