Estimation Method of Unobservable Oscillations in Sampled-Data Positioning Systems

カテゴリ: 論文誌(論文単位)

グループ名: 【D】産業応用部門（英文）

発行日: 2017/05/01

タイトル(英語): Estimation Method of Unobservable Oscillations in Sampled-Data Positioning Systems

著者名: Takenori Atsumi (Department of Mechanical Engineering, Chiba Institute of Technology)

著者名(英語): Takenori Atsumi (Department of Mechanical Engineering, Chiba Institute of Technology)

キーワード: sampled-data control，digital control，motion control，vibration control，hard disk drive

要約(英語): Unobservable oscillations of the controlled variable of sampled-data positioning control systems may degrade the performance and reliability of mechatronic products. For example, a control input in the sampled-data control system can easily excite transient vibrations of mechanical resonances around the sampling frequency. However, these vibrations are difficult to measure in the sampled-data control system. The degree to which these oscillations are unobservable or observable depends on the sampling frequency, oscillation frequency, and the initial phase of the oscillations. This paper shows the relationship between the sampling frequency, oscillation frequency, and the initial phase of the oscillations. As a result, two indexes of an unobservable position are proposed with maximum and root-mean-square amplitudes to estimate the effects of the unobservable oscillations of mechanical resonances in positioning control systems. These indexes show that the sampling frequency and number of samples of measurement data for estimating the unobservable magnitude of oscillations are important parameters that designers must choose carefully. To demonstrate the use of the proposed indexes, unobservable magnitudes of oscillations are analyzed for a head-positioning control system in a hard disk drive.

本誌: IEEJ Journal of Industry Applications Vol.6 No.3 （2017）

本誌掲載ページ: 199-204 p

原稿種別: 論文／英語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejjia/6/3/6_199/_article/-char/ja/