The dynamics of hydraulic systems are highly nonlinear and the system may be subjected to non-smooth and discontinuous nonlinearities due to directional change of valve opening, friction, etc. Aside from the nonlinear...The dynamics of hydraulic systems are highly nonlinear and the system may be subjected to non-smooth and discontinuous nonlinearities due to directional change of valve opening, friction, etc. Aside from the nonlinear nature of hydraulic dynamics, hydraulic servo systems also have large extent of model uncertainties. To address these challenging issues, a robust state-feedback controller is designed by employing backstepping design technique such that the system output tracks a given signal arbitrarily well, and all signals in the closed-loop system remain bounded. Moreover, a relevant disturbance attenuation inequality is satisfied by the closed-loop signals. Compared with previously proposed robust controllers, this paper's robust controller based on backstepping recursive design method is easier to design, and is more suitable for implementation.展开更多
Along the line of the classical generalized linear model,the classical generalized linear model is improved in this article by assuming the partial coefficients of the regressors to be arbitrary functions of the point...Along the line of the classical generalized linear model,the classical generalized linear model is improved in this article by assuming the partial coefficients of the regressors to be arbitrary functions of the points in some metric space.This new type of regression model is called in this article semiparametric vary coefficient generalized linear model and the back fitting approach is suggested to fit the proposed model,and the smoothing parameter therein are studied.The proposed model not only have higher flexibility and adaptability,but also is suitable for analysis spatial data and therefore has extensive application backgrounds.展开更多
文摘The dynamics of hydraulic systems are highly nonlinear and the system may be subjected to non-smooth and discontinuous nonlinearities due to directional change of valve opening, friction, etc. Aside from the nonlinear nature of hydraulic dynamics, hydraulic servo systems also have large extent of model uncertainties. To address these challenging issues, a robust state-feedback controller is designed by employing backstepping design technique such that the system output tracks a given signal arbitrarily well, and all signals in the closed-loop system remain bounded. Moreover, a relevant disturbance attenuation inequality is satisfied by the closed-loop signals. Compared with previously proposed robust controllers, this paper's robust controller based on backstepping recursive design method is easier to design, and is more suitable for implementation.
文摘Along the line of the classical generalized linear model,the classical generalized linear model is improved in this article by assuming the partial coefficients of the regressors to be arbitrary functions of the points in some metric space.This new type of regression model is called in this article semiparametric vary coefficient generalized linear model and the back fitting approach is suggested to fit the proposed model,and the smoothing parameter therein are studied.The proposed model not only have higher flexibility and adaptability,but also is suitable for analysis spatial data and therefore has extensive application backgrounds.
