This paper presents an adaptive friction compensation method based on LuGre model for large diameter electric-hydraulic proportional valves in which the valve core contains friction.A mathematic model of the electric-...This paper presents an adaptive friction compensation method based on LuGre model for large diameter electric-hydraulic proportional valves in which the valve core contains friction.A mathematic model of the electric-hydraulic proportional valve is established,and the friction characteristics are described based on the LuGre model.The global asymptotic stability of the control system with the adaptive friction compensation controller is guaranteed over Lyapunov theorem.The adaptive compensation of the friction on LuGre friction model is verified by simulation and experiment.The steady-state error is about [-4.23 × 10^(-5)m,5.91 × 10^(-5)m]and[-2.5 × 10^(-4)m,2.6 ×10^(-4) m] on simulation and experiment,the position tracking accuracy is higher,and the lag time of the main valve through the dead zone is shorter.The result proves that the adaptive friction compensation method can effectively compensate for the negative effects of nonlinear friction.展开更多
Recently many researches suggest that CEO compensation is not only related to performance. And this relation is non-linear. This paper analyzes CEO compensation, salary and stockholding value with BP neutral network w...Recently many researches suggest that CEO compensation is not only related to performance. And this relation is non-linear. This paper analyzes CEO compensation, salary and stockholding value with BP neutral network with the data from listed companies during 2003--2005 in China. The results are： 1） The fitness of network outputs are 91.09%, 97：23% and 78.44% respectively; 2） The accurate of forecast improves 92.72%, 92.08% and 53.89% respectively comparing with the results of multi-regression model.展开更多
基金Supported by the National Key Basic Research Program of China(No.2014CB046405)Key Projects in the National Science&Technology Pillar Program during the Twelfth Five-year Plan of China(No.2014BAF02B00,2011BAF09B04)
文摘This paper presents an adaptive friction compensation method based on LuGre model for large diameter electric-hydraulic proportional valves in which the valve core contains friction.A mathematic model of the electric-hydraulic proportional valve is established,and the friction characteristics are described based on the LuGre model.The global asymptotic stability of the control system with the adaptive friction compensation controller is guaranteed over Lyapunov theorem.The adaptive compensation of the friction on LuGre friction model is verified by simulation and experiment.The steady-state error is about [-4.23 × 10^(-5)m,5.91 × 10^(-5)m]and[-2.5 × 10^(-4)m,2.6 ×10^(-4) m] on simulation and experiment,the position tracking accuracy is higher,and the lag time of the main valve through the dead zone is shorter.The result proves that the adaptive friction compensation method can effectively compensate for the negative effects of nonlinear friction.
基金This project is supported by National Natural Science Foundation of China （70671058）
文摘Recently many researches suggest that CEO compensation is not only related to performance. And this relation is non-linear. This paper analyzes CEO compensation, salary and stockholding value with BP neutral network with the data from listed companies during 2003--2005 in China. The results are： 1） The fitness of network outputs are 91.09%, 97：23% and 78.44% respectively; 2） The accurate of forecast improves 92.72%, 92.08% and 53.89% respectively comparing with the results of multi-regression model.
