Objective To analysis the causes of valve prosthesis-patient mismatch (PPM) after mitral valve replacement in Chinese patients. Methods Consecutive 100 patients for elective mitral valve replacement from January 2009 ...Objective To analysis the causes of valve prosthesis-patient mismatch (PPM) after mitral valve replacement in Chinese patients. Methods Consecutive 100 patients for elective mitral valve replacement from January 2009 to June 2009 were enrolled and followed for this study. There were 37 males and 63 females.展开更多
This paper presents an adaptive saturated integral sliding mode controller(ASISMC)integrated with an adaptive extended state observer(AESO)to address the challenges of nonlinear time-varying characteristics,parameter ...This paper presents an adaptive saturated integral sliding mode controller(ASISMC)integrated with an adaptive extended state observer(AESO)to address the challenges of nonlinear time-varying characteristics,parameter uncertainties,and external disturbances in valve positioner systems(VPS).To begin with,the VPS dynamic model is established by combining the valve positioner model,the control valve model,and the Euler-Lagrange model,where the uncertain parameters are estimated using the adaptive laws.Moreover,a tracking differentiator(TD)is implemented to ensure smooth and continuous signal processing.The AESO with structural self-regulation capability is also developed to estimate system perturbations and uncertainties effectively.Meanwhile,the proposed ASISMC is designed using adaptive laws based on the backstepping technique,further enhanced by setting saturation constraints on the integral sliding film surface.Finally,experimental validation confirms the superiority of the proposed approach over existing methods in improving control precision,response velocity,and disturbance rejection capability.展开更多
Pneumatic control valve is a throttling depending on the local resistance change to achieve components, is usually made up of actuator and control valve, pneumatic control valve of the automatic process of offshore oi...Pneumatic control valve is a throttling depending on the local resistance change to achieve components, is usually made up of actuator and control valve, pneumatic control valve of the automatic process of offshore oil platform during the specific choice, needs to focus on analysis of pneumatic control valve stroke, pneumatic control valve structure and combining with the Marine climate environment of material aspects, such as selection of effects.展开更多
文摘Objective To analysis the causes of valve prosthesis-patient mismatch (PPM) after mitral valve replacement in Chinese patients. Methods Consecutive 100 patients for elective mitral valve replacement from January 2009 to June 2009 were enrolled and followed for this study. There were 37 males and 63 females.
基金supported by the National Key Research and Development Program of China(Grant No.2022YFF0708902)the Ningbo Key Technology Research and Development Program(Grant No.2023Z018)+1 种基金the Liupanshan Laboratory Basic Research Program(Grant No.LPS-2024-KY-D-JC-0008)the Youth Fund of National Natural Science Foundation of China(Grant No.52205043)。
文摘This paper presents an adaptive saturated integral sliding mode controller(ASISMC)integrated with an adaptive extended state observer(AESO)to address the challenges of nonlinear time-varying characteristics,parameter uncertainties,and external disturbances in valve positioner systems(VPS).To begin with,the VPS dynamic model is established by combining the valve positioner model,the control valve model,and the Euler-Lagrange model,where the uncertain parameters are estimated using the adaptive laws.Moreover,a tracking differentiator(TD)is implemented to ensure smooth and continuous signal processing.The AESO with structural self-regulation capability is also developed to estimate system perturbations and uncertainties effectively.Meanwhile,the proposed ASISMC is designed using adaptive laws based on the backstepping technique,further enhanced by setting saturation constraints on the integral sliding film surface.Finally,experimental validation confirms the superiority of the proposed approach over existing methods in improving control precision,response velocity,and disturbance rejection capability.
文摘Pneumatic control valve is a throttling depending on the local resistance change to achieve components, is usually made up of actuator and control valve, pneumatic control valve of the automatic process of offshore oil platform during the specific choice, needs to focus on analysis of pneumatic control valve stroke, pneumatic control valve structure and combining with the Marine climate environment of material aspects, such as selection of effects.
