二维驱动三维(Logical to Physical,L2P)是三维体验(3D Experience)平台中由二维原理图设计过渡到三维模型设计的重要方法,采用该方法可提高三维设计中船舶设备布置的准确性和效率。结合工程实际,从资源配置和驱动过程2个方面系统阐述L2...二维驱动三维(Logical to Physical,L2P)是三维体验(3D Experience)平台中由二维原理图设计过渡到三维模型设计的重要方法,采用该方法可提高三维设计中船舶设备布置的准确性和效率。结合工程实际,从资源配置和驱动过程2个方面系统阐述L2P的驱动机制,运用该核心技术实现对设备的位置驱动,并通过EKL编程实现基于船舶坐标系的设备精准布置。通过研究,为三维设计中轮机、电气和舾装等设备的布置提供具体的技术路线。展开更多
A nonlinear controller based on an extended second-order disturbance observer is presented to track desired position for an electro-hydraulic single-rod actuator in the presence of both external disturbances and param...A nonlinear controller based on an extended second-order disturbance observer is presented to track desired position for an electro-hydraulic single-rod actuator in the presence of both external disturbances and parameter uncertainties. The proposed extended second-order disturbance observer deals with not only the external perturbations, but also parameter uncertainties which are commonly regarded as lumped disturbances in previous researches. Besides, the outer position tracking loop is designed with cylinder load pressure as output; and the inner pressure control loop provides the hydraulic actuator the characteristic of a force generator. The stability of the closed-loop system is provided based on Lyapunov theory. The performance of the controller is verified through simulations and experiments. The results demonstrate that the proposed nonlinear position tracking controller, together with the extended second-order disturbance observer, gives an excellent tracking performance in the presence of parameter uncertainties and external disturbance.展开更多
文摘二维驱动三维(Logical to Physical,L2P)是三维体验(3D Experience)平台中由二维原理图设计过渡到三维模型设计的重要方法,采用该方法可提高三维设计中船舶设备布置的准确性和效率。结合工程实际,从资源配置和驱动过程2个方面系统阐述L2P的驱动机制,运用该核心技术实现对设备的位置驱动,并通过EKL编程实现基于船舶坐标系的设备精准布置。通过研究,为三维设计中轮机、电气和舾装等设备的布置提供具体的技术路线。
基金Project(51221004)supported by the Science Fund for Creative Research Groups of National Natural Science Foundation of ChinaProject(2012AA041801)supproted by the High-tech Research and Development Program of China
文摘A nonlinear controller based on an extended second-order disturbance observer is presented to track desired position for an electro-hydraulic single-rod actuator in the presence of both external disturbances and parameter uncertainties. The proposed extended second-order disturbance observer deals with not only the external perturbations, but also parameter uncertainties which are commonly regarded as lumped disturbances in previous researches. Besides, the outer position tracking loop is designed with cylinder load pressure as output; and the inner pressure control loop provides the hydraulic actuator the characteristic of a force generator. The stability of the closed-loop system is provided based on Lyapunov theory. The performance of the controller is verified through simulations and experiments. The results demonstrate that the proposed nonlinear position tracking controller, together with the extended second-order disturbance observer, gives an excellent tracking performance in the presence of parameter uncertainties and external disturbance.