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A Multirate Repetitive Control for Fractional-Order Servos in Laser-Based Additive Manufacturing
This paper studies repetitive control (RC) algorithms to advance the quality of repetitive energy deposition in laser-based additive …
Dan Wang
,
Xu Chen
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Periodic Wind Disturbance Rejection using Robust Individual Pitch Control
A robust individual pitch control strategy is presented to deal with periodic load disturbances on wind turbines under operating point …
Yuan Yuan
,
Xu Chen
,
Jiong Tang
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Realtime Control-Oriented Modeling and Disturbance Parameterization for Smart and Reliable Powder Bed Fusion Additive Manufacturing
The vision of sustainable mass customization calls for additive manufacturing (AM) processes that are resilient to process variations …
Xu Chen
,
Tianyu Jiang
,
Dan Wang
,
Hui Xiao
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Control of Dual-stage HDDs with Enhanced Repetitive Disturbance Rejection
Nowadays, despite the emerging adoption of the solid state drives, hard disk drives (HDDs) are still used extensively as cost-effective …
Shiying Zhou
,
Xu Chen
,
Minghui Zheng
,
Masayoshi Tomizuka
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DOI
An Inverse-Free Disturbance Observer for Adaptive Narrow-Band Disturbance Rejection With Application to Selective Laser Sintering
Selective laser sintering (SLS) is an additive manufactur- ing (AM) process that builds 3-dimensional (3D) parts by scan- ning a laser …
Tianyu Jiang
,
Hui Xiao
,
Xu Chen
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Multi-band beyond-Nyquist Disturbance Rejection on a Galvanometer Scanner System
In many laser processing applications, galvanometer scanners are integrated to a larger system that creates external disturbances to …
Hui Xiao
,
Xu Chen
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DOI
Disturbance Observer Based Control Design for Wind Turbine Speed Regulation
Disturbance observer based (DOB) control has been implemented in motion control to reject unknown or time-varying disturbances. In this …
Yuan Yuan
,
Xu Chen
,
Jiong Tang
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DOI
Spectral Distribution and Implications of Feedback Regulation beyond Nyquist Frequency
A fundamental challenge in digital and sampled-data control arises when the continuous-time plant is subject to fast disturbances that …
Dan Wang
,
Masayoshi Tomizuka
,
Xu Chen
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DOI
Enhanced Wide-Spectrum Vibration Suppression Based on Adaptive Loop Shaping
In linear feedback control, the attenuation of disturbances at the designer-selected frequencies is subjected to the fundamental …
Liting Sun
,
Xu Chen
,
Masayoshi Tomizuka
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DOI
Extended State Observer with Phase Compensation to Deal with High-frequency Vibrations in Hard Disk Drives
The extended state observer (ESO), as a special case of high-gain observers, can estimate not only the state variables but also unknown …
Minghui Zheng
,
Xu Chen
,
Masayoshi Tomizuka
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DOI
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