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.
Kinetic friction in motion control systems is subject to large uncertainties due to the multiple, and often weakly known, internal and external factors such as roughness, thermal and lubricant state of contacting surfaces, varying normal loads, dwell time, wear, and others. The single modeling of friction behavior, even if comprehensive and accurate enough, appears to be insufficient for accurately...
The positioning control in presence of nonlinearities can exhibit the limit cycles at settling when a simple integral co-action is included into the feedback. On the contrary, the sliding mode feedback allows attaining a robust convergence to the reference in presence of parametric uncertainties and nonlinearities like pre-sliding friction. In order to avoid the control chattering at higher gains,...
In this paper, we address the identification and design of the sensorless torsion control of elastic robotic joints which has been proposed in our previous work. We discuss some practical aspects of the proposed method which should be accounted for a ready-assembled robotic manipulator at hand. The series of identification experiments required for determining the model-based components is designed...
The novel nonlinear state observer for control of pre-sliding friction is proposed. The parameter-varying state-space representation of motion dynamics is derived as a function of the variable pre-sliding distance. The proposed Luenberger-type asymptotic state observer, obtained in the closed analytic form, is analyzed and evaluated by experiments. When augmenting the common PD and PID position feedback...
This paper describe a head positioning controller in HDDs based on a dynamic characteristic of rolling friction. In the control system in HDDs, the head assembly was influenced the effect of several disturbances, e.g, RRO, flutter vibration, force disturbance, and so on. At the force disturbance, it caused by wind force, external shock, tension force of Flexible Printed Circuit, and rolling friction...
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.