The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The grounding line (GL) is the location where ice sheet lose contact with the bed rock. Since this line is under the surface ice, it's hard to define the GL. However, the different basal condition besides the GL caused different vertical movement and a flexure is often formed at the GL. This flexure is detectable by optical images. Meanwhile the ocean-induced vertical movement is detectable by repeat...
According to the modern control and optimal estimation theory, a mathematical model of the pilot attention resource allocation is developed This model analyzes the inherent characteristics of pilot input and output links in the pilot-vehicle closed-loop system, and the optimal control model of pilot is established by simplification and mathematical modeling. The control task chosen in this paper concerns...
Since clouds are one of the most important meteorological phenomena related to the hydrological cycle and affect Earth radiation balance and climate changes, cloud analysis is a crucial issue in meteorological research. Most researchers only consider the classification task of cloud images while less attention has been paid to the synthesis one. In addition, all the existing research on cloud identification...
Considering unstable oscillation in the process of rotating machinery caused by changing in load lubrication and gear meshing stiffness in shaft system, the coupled nonlinear dynamic equation of rotating mechanical drive system is established with time-varying stiffness and nonlinear friction force based on Lagrange theory. The average equation of system is solved with the aid of method of multiple...
High accuracy of laser-beam pointing is crucial for reliable operation of Free Space Laser Communication. The tracking accuracy and bandwidth of rejection frequency response are directly determined by the performance of the fine tracking loop of Acquisition, Tracking and Pointing (ATP) system. In this paper, the architecture of the fine tracking system for the designing optical communication terminal...
This paper proposes a fuzzy adaptive controller based on dead-zone compensator for a free-floating space robot (FFSR) in the presence of the unmodeled nonlinear dynamics and additional disturbances. In the micro-gravity space environment, the FFSR lacks a fixed base. As a result, there is high dynamic coupling between the manipulators and the free-floating base, which leads to two inherent difficulties,...
This paper proposes an adaptive controller for a free-floating space robot (FFSR) in the presence of kinematic and dynamic model uncertainties. Because of high dynamical coupling between the actively operated manipulator and the free-floating base, two inherent difficulties exist, such as non-linear parameterization of the dynamic equation and both kinematic and dynamic parameter uncertainties. In...
This paper presents an analysis and implementation of a switching vector control scheme for Permanent Magnet Synchronous Motor (PMSM) drive using a digital signal processor (DSP). Firstly, the field orientated vector control theory of PMSM and Space Vector Pulse Width Modulation ( SVPWM ) method are presented. Then a DSP-based full-digital PMSM servo system is developed with power circuit, control...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.