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.
Spatial queries including similarity search and similarity joins are useful in many areas, such as multimedia retrieval, data integration, and so on. However, they are not supported well by commercial DBMSs. This may be due to the complex data types involved and the needs for flexible similarity criteria seen in real applications. In this paper, we propose a versatile and efficient disk-based index...
Lightweight stages are becoming the new trend in industrial high performance motion systems. They are generally less stiff than the traditional designs and more pronounced resonant dynamics usually appear in low frequency region. Control design methods to deal with these flexible modes effectively are known as the Beyond Rigid Body (BRB) control. In high performance tracking control, such as wafer...
Linear direct feed drives are widely used in high performance equipment and machine tools, but the abrupt counter force to the machine frame from the secondary part of the linear motor induces possible residue vibration. The jerk decoupling cartridge (JDC) provides a buffer to reduce such an impact. However, no existing JDC design considers the factors of closed-loop control together with mechanical...
Jerk derivative feedforward control is proposed and used in recent literatures. However, such feedforward control scheme is restricted to the minimum-phase system which has constrained static gains in the flexible modes. This paper presents a novel form of feedforward controller for a wider class of flexible motion systems, even to be non-minimum phase, as long as the summation of DC gains of flexible...
A new nonlinear variable structure guidance law considering missile dynamics of autopilot against the space maneuver target is presented. Considering the target maneuverability as a disturbance with boundary, this guidance law constructs the switching surface by adding a nonlinear function which is confirmed by feedback optimization theory at the linear switching surface based on the proportional...
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.