High Precision Tracking Control based on Pseudo-Inverse Feedforward Control System for Next-Generation Optical Disks

Abstract

The crossover function for the specific heat of a disordered material is constructed to order E by solving the renormalisation group equations for the m n model (m + 0, n > 1).From this an effective exponent is obtained which provides a local measure of the degree of singularity of the specific heat in the critical region. It is seen that as the critical region is approached from above the critical temperature the effective exponent behaves initially as if no disorder were present. But as the critical temperature is more closely approached the effective exponent crosses over to the value predicted for the disordered material.

Full FPGA Tracking Control System Based on Error-Based Communication Disturbance Observer Considering Time Delay for Optical Disc System

“…In order to confirm the validity of the ECDOB and CDOB, this paper performs the numerical simulation. In the numerical simulation results, the trajectory command y re f (k) of tracking actuator is created by experimental results (8) . In the ECDOB performs its functions regardless of the feedback controller.…”

Double Feedforward Control System Based on Precise Disturbance Modeling for Optical Disk

“…We have already proposed an error prediction tracking control system with an equivalentperfect tracking control (E-PTC) system. [9][10][11] The experimental results of the E-PTC system indicated adequate suppression of the tracking error. However, it is difficult to design the control parameter for actual multi-harmonic disturbances.…”

“…The amplitude and phase of the inverseoperated eccentric disturbance are respectively obtained using Eqs. (10) and (11). SðzÞ is the discretized sensitivity function of the feedback control system.…”

“…Using the pseudoinverse matrix, we have already proposed that it is possible to compose the E-PTC system. [9][10][11] The E-PTC system enables the entire system to be composed of a single sampling frequency. The inverse system of the E-PTC system can be represented in its pre-multi-rate state, as shown in Eqs.…”

Fine Tracking Control System based on Double Equivalent-Perfect Tracking Control System and Error-Based Disturbance Observer for Optical Disk

“…The conventional PTC system realizes a high-precision system; however, the whole system is complicated, and the processing time is long. This problem is solved by using an equivalent-perfect tracking control (E-PTC) as the de-sign method for the feedforward control system, and the good performance of this approach was confirmed experimentally (12) (13) .…”