Yang, KJ Choi, YJ Chung, WK 2024-01-21T05:36:57Z 2024-01-21T05:36:57Z 2021-09-03 2005-02 0278-0046 https://pubs.kist.re.kr/handle/201004/136801 There are many control methods to guarantee the robustness of a system. Among them, the disturbance observer (DOB) has been widely used because it is easy to apply and the cost is low due to its simplicity. Generally, an output signal of the system is required to construct a DOB, but for some systems such as magnetic/optical disk drive systems, we cannot measure the position output signal, but only the position error signal (PES). In order to apply a DOB to such systems, we must use an error signal instead of an output signal. We call it the error-based disturbance observer (EDOB) system. In this paper, we analyze the differences between a conventional DOB system and EDOB system, and show the effectiveness of the proposed EDOB through simulations and experiments. Also, this paper proposes criteria to enhance the robustness of an EDOB system, and reveals the disturbance rejection property of the EDOB system. Finally, we propose a new method of a double Q system to improve the track-following performance. This is also verified through experiments for a DVD 12 x optical disk drive system. English IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC FREEDOM DESIGN On the tracking performance improvement of optical disk drive servo systems using error-based disturbance observer Article 10.1109/TIE.2004.841069 1 IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, v.52, no.1, pp.270 - 279 IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS 52 1 270 279 scie scopus 000226755900031 2-s2.0-13944275557 Automation & Control Systems Engineering, Electrical & Electronic Instruments & Instrumentation Automation & Control Systems Engineering Instruments & Instrumentation Article FREEDOM DESIGN digital signal processor (DSP) error-based disturbance observer (EDOB) normalized coprime factorization optical disk drive (ODD) system robustness tracking servo