Generally, tracking control for optical disk system is accomplished by the feedback control designed by using PID control, repetitive control and so on. However, it is difficult to reduce the tracking error on condition of high disk rotation speed. In the near future, the disk rotation speed of the optical disk system becomes higher than 10000[rpm]. Therefore, the tracking servo system for opti...

The conventional hydraulic valve-controlled systems have high response but low energyefficiency. Hydraulic pump-controlled servo systems have high energy efficiency. However, the conventional pump-controlled systems, which are altered by displacement via variable displacement pumps, have lower response. This paper aims to investigate the force control performance of the high response electro-hy...

In this paper, a biologically inspired motion detector (Reichardt-Model) is introduced into visual servo control to ensure stability of the system with high gain and timedelay in its feedback. As a consequence of the specific velocity dependence of the Reichardt-Model, the stability margin of the visual servo control is increased and high overall gains, thus, better performance are achievable. ...

In this paper, an adaptive piecewise linear control scheme is proposed for improving the performance and response time of servo mechanical control systems. It is a gain stabilized control technique. No large phase lead compensations or pole zero cancellations are needed for performance improvement. Large gain is used for large tracking error to get fast response. Small gain is used between larg...

As capacity demands for magnetic tape storage systems grow, servo actuator design for tracking data on high density tape media presents new modeling and control design challenges. In this paper a frequency weighted subspace identification algorithm is presented for control relevant model estimation of a tape servo actuator. Common to other subspace identification methods, the proposed algorithm...

The hard disk drive storage industry is driven to increase data storage density, with increasing tracks per inch (TPI) and bits per inch (BPI) on the recording media. In the development of higher density recording, high-speed testing of magnetic heads and media in engineering and manufacturing environments has traditionally focused on spinstands and disk head testers. This paper describes a hig...

The design process of hydraulic drives requires a lot of knowledge and experience although many computer tools are available that aid in various aspects of the design. One of these aspects is the selection of a suitable control strategy and its parameterisation. While being a significant key for the performance of servo-hydraulic drives it is nevertheless often neglected because of lack of know...

This paper presents the position tracking performance of an electro-hydraulic hydraulic servo (EHS) system using sliding mode control (SMC) with proportional-integral-derivative (PID) sliding surface. In modelling process, a mathematical model of the EHS system is developed by considering its nonlinearities as represented by a Lu-Gre friction model. The control strategy is derived from the deve...

This paper investigates the problem of compensating miss-distance delay in opto-electronic platform tracking servo system. According to the characteristic of LOS (light-of-sight) motion, we setup the Markovian process model and compensate this unknown time-varying delay by feed-forward forecasting controller based on robust H∞ control. Finally, simulation based on double closed-loop PI (Proport...

To achieve high quality and productivity, it is important to know what is the maximum feed rate while meeting the required part accuracy. Laser interferometers and telescoping ballbars have been used for the positioning and circular contouring measurement. However, a conventional laser is limited by the line-of-sight, and cannot tolerate large lateral deviations. A telescoping ballbar is limite...