Two adaptive friction compensation schemes are developed for a high precision turntable system with nonlinear dynamic friction to handle two types of parametric uncertainties in the friction. Both schemes utilize a no...Two adaptive friction compensation schemes are developed for a high precision turntable system with nonlinear dynamic friction to handle two types of parametric uncertainties in the friction. Both schemes utilize a nonlinear observer/filter structure to compensate for uncertainties in corresponding friction parameters associated with the turntable system. Moreover, in the second scheme, adjustable gains are introduced into the dual nonlin- ear filters and they can be tuned to improve the position tracking performance. In both cases, a Lyapunov-like argument is provided for the global asymptotic stability of the closed-loop system. Simulation results demonstrate the effectiveness of the proposed schemes.展开更多
＂Over＂ phenomenon exists in all fields of society, and over thoughts and behaviors not only waste resources, but also destroy the ecological environment.Landscape design is also facing the dilemma of over planning, ...＂Over＂ phenomenon exists in all fields of society, and over thoughts and behaviors not only waste resources, but also destroy the ecological environment.Landscape design is also facing the dilemma of over planning, over design and over construction. Based on the paraphrase and explanation of ＂degree＂, the principle for modest landscape design with the concept of sustainable development was explored through the analysis on the concept of sustainable development, which emphasized the ＂degree＂ standard in landscape design, and the combination of regional features with native features to carry out ecological design, with the aim to facilitate the landscape designers to design the ＂modest＂ landscape with sustainable development.展开更多
文摘Two adaptive friction compensation schemes are developed for a high precision turntable system with nonlinear dynamic friction to handle two types of parametric uncertainties in the friction. Both schemes utilize a nonlinear observer/filter structure to compensate for uncertainties in corresponding friction parameters associated with the turntable system. Moreover, in the second scheme, adjustable gains are introduced into the dual nonlin- ear filters and they can be tuned to improve the position tracking performance. In both cases, a Lyapunov-like argument is provided for the global asymptotic stability of the closed-loop system. Simulation results demonstrate the effectiveness of the proposed schemes.
文摘＂Over＂ phenomenon exists in all fields of society, and over thoughts and behaviors not only waste resources, but also destroy the ecological environment.Landscape design is also facing the dilemma of over planning, over design and over construction. Based on the paraphrase and explanation of ＂degree＂, the principle for modest landscape design with the concept of sustainable development was explored through the analysis on the concept of sustainable development, which emphasized the ＂degree＂ standard in landscape design, and the combination of regional features with native features to carry out ecological design, with the aim to facilitate the landscape designers to design the ＂modest＂ landscape with sustainable development.
