2016
DOI: 10.1299/jamdsm.2016jamdsm0061
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Analysis of open-loop characteristics on SISO sampled-data positioning control system

Abstract: In the sampled-data positioning control system of mechatronic products, it is hard to analyze the effect of mechanical resonances above the Nyquist frequency after the control systems were assembled. However, unexpected variations of mechanical characteristics often happen in actual mechatronic systems. To solve such a problem, this paper proposed two analysis methods with measurable open-loop characteristics in single-input/single-output (SISO) sampled-data positioning control systems. These methods use frequ… Show more

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Cited by 6 publications
(4 citation statements)
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“…This means that the control system for the magnetic head position is a sampled-data control system which should control not only sampled position but also intersampling position. Therefore, we have to evaluate performances of the control system by using continuous-time signals instead of measurable discrete-time signals (Atsumi and Messner, 2013;Atsumi and Messner, 2014;Atsumi, 2016;Atsumi, 2017a). Atsumi, Journal of Advanced Mechanical Design, Systems, and Manufacturing, Vol.12, No.1 (2018) 2.1.…”
Section: Magnetic Head Positioning System In Hddsmentioning
confidence: 99%
See 1 more Smart Citation
“…This means that the control system for the magnetic head position is a sampled-data control system which should control not only sampled position but also intersampling position. Therefore, we have to evaluate performances of the control system by using continuous-time signals instead of measurable discrete-time signals (Atsumi and Messner, 2013;Atsumi and Messner, 2014;Atsumi, 2016;Atsumi, 2017a). Atsumi, Journal of Advanced Mechanical Design, Systems, and Manufacturing, Vol.12, No.1 (2018) 2.1.…”
Section: Magnetic Head Positioning System In Hddsmentioning
confidence: 99%
“…24, dot-dashed lines indicate the results without the flying-height control, solid lines indicate the results with the feedforward control only for the flying-height control, and dashed lines indicate that results with the proposed TDOF control for the flying-height control. Note that these figures and table showed the results of continuous-time signals y cFH that include intersampling oscillations for the sampled-data control system (Atsumi and Messner, 2012;Atsumi and Messner, 2013;Atsumi and Messner, 2014;Atsumi, 2016). From these simulation results, we can see that, when the control system doesn't have plant perturbations, the flyingheight fluctuations with the feedforward and the TDOF controls are almost same because the feedforward control can compensate for almost all of the flying-height fluctuations in discrete-time signal y dFH and the feedback controller doesn't need to work for the flying-height fluctuations.…”
Section: Performance Evaluation Against Plant Perturbationsmentioning
confidence: 99%
“…The HDD is comprised of disks, a spindle motor, magnetic heads, and a voice coil motor (VCM). In the magnetic-head positioning control systems of the HDD, the control input is an input command value to a VCM driver, and the observed output is the magnetic-head position (Atsumi, 2016b). Note that we can use many second-order filters for the magnetic-head position control system (Atsumi et al, 2007).…”
Section: Improving H ∞ Controller Using Rcbode Plotmentioning
confidence: 99%
“…magnetic-head-position signal is generated from embedded information in servo sectors located at regular intervals on the disks. The magnetic-head-position signal therefore is only available as a discrete-time signal at a sampling time determined by the rotation rate of the spindle and the number of servo sectors (Atsumi and Messner, 2012a;Atsumi and Messner, 2013;Atsumi and Messner, 2014;Atsumi, 2016a;Atsumi, 2017a;Atsumi, 2017b). Figure 2 shows a magnetic head which includes thermal actuators for the TFC and TPC systems.…”
Section: Magnetic-head-positioning System In Hddsmentioning
confidence: 99%