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
The traditional costumes-Han fu and Kimono,are also the typical representatives of China and Japan.While costume pattern as a kind of traditional culture,is an essential symbol,reflecting ethnic characteristics and pl...The traditional costumes-Han fu and Kimono,are also the typical representatives of China and Japan.While costume pattern as a kind of traditional culture,is an essential symbol,reflecting ethnic characteristics and playing an important part in costumes.Based on the consultation,analysis and arrangement of literature data,this paper studied on costume patterns of the two countries,carrying out their comparison in the forms,the color and the connotation respectively,and summarizing their own characteristics.It is through the study that we will be able to inherit the traditional patterns and put them into innovation in modern clothing design.展开更多
Clothing is the human culture and the historical development of the witness, also the combination of human science and new technology and the art of the perfect embodiment. In the modem fashion design, No color depart...Clothing is the human culture and the historical development of the witness, also the combination of human science and new technology and the art of the perfect embodiment. In the modem fashion design, No color department -- has been like a flag stand at the top of the fashion.. No color clothing brand has a good plasticity and explores the market potential. This is no color system as never eliminate color elements and design inspiration in widespread use in the clothing design by designers.展开更多
This paper considers a single server retrial queue in which a state-dependent service policy is adopted to control the service rate. Customers arrive in the system according to a Poisson process and the service times ...This paper considers a single server retrial queue in which a state-dependent service policy is adopted to control the service rate. Customers arrive in the system according to a Poisson process and the service times and inter-retrial times are all exponentially distributed. If the number of customers in orbit is equal to or less than a certain threshold, the service rate is set in a low value and it also can be switched to a high value once this number exceeds the threshold. The stationary distribution and two performance measures are obtained through the partial generating functions. It is shown that this state-dependent service policy degenerates into a classic retrial queueing system without control policy under some conditions. In order to achieve the social optimal strategies, a new reward-cost function is established and the global numerical solutions, obtained by Canonical Particle Swarm Optimization algorithm, demonstrate that the managers can get more benefits if applying this state-dependent service policy compared with the classic model.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The traditional costumes-Han fu and Kimono,are also the typical representatives of China and Japan.While costume pattern as a kind of traditional culture,is an essential symbol,reflecting ethnic characteristics and playing an important part in costumes.Based on the consultation,analysis and arrangement of literature data,this paper studied on costume patterns of the two countries,carrying out their comparison in the forms,the color and the connotation respectively,and summarizing their own characteristics.It is through the study that we will be able to inherit the traditional patterns and put them into innovation in modern clothing design.
文摘Clothing is the human culture and the historical development of the witness, also the combination of human science and new technology and the art of the perfect embodiment. In the modem fashion design, No color department -- has been like a flag stand at the top of the fashion.. No color clothing brand has a good plasticity and explores the market potential. This is no color system as never eliminate color elements and design inspiration in widespread use in the clothing design by designers.
基金supported by the National Natural Science Foundation of China under Grant Nos.71571014 and 71390334
文摘This paper considers a single server retrial queue in which a state-dependent service policy is adopted to control the service rate. Customers arrive in the system according to a Poisson process and the service times and inter-retrial times are all exponentially distributed. If the number of customers in orbit is equal to or less than a certain threshold, the service rate is set in a low value and it also can be switched to a high value once this number exceeds the threshold. The stationary distribution and two performance measures are obtained through the partial generating functions. It is shown that this state-dependent service policy degenerates into a classic retrial queueing system without control policy under some conditions. In order to achieve the social optimal strategies, a new reward-cost function is established and the global numerical solutions, obtained by Canonical Particle Swarm Optimization algorithm, demonstrate that the managers can get more benefits if applying this state-dependent service policy compared with the classic model.
