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Frequency Adaptive Control Technique for Periodic Runout and Wobble Cancellation in Optical Disk Drives [PDF]
Journal of Systemics, Cybernetics and Informatics, 2006 Periodic disturbance occurs in various applications on the control of the rotational mechanical systems. For optical disk drives, the spirally shaped tracks are usually not perfectly circular and the assembly of the disk and spindle motor is unavoidably ...
Yee-Pien Yang, Jieng-Jang Liu
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Advances in Mechanical Engineering, 2017 In this article, the problem of asymptotic attenuation and rejection is investigated for a class of cascade systems with general periodic disturbances via a non-linear disturbance observer and H ∞ control. First, a novel disturbance observer is developed
Linlin Hou, Haibin Sun, Chuanguang Sun
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Roll Eccentricity Detection and Application Based on SFT and Regional DFT
Sensors, 2023 Roll eccentricity disturbance is a high-frequency periodic change signal caused by the irregular shape of the roll and roll bearing, which is difficult to identify and affects the periodic deviation of the exit thickness of the strip.
Kexin Yang, Gang Zheng, Zhe Yang
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Advances in Mechanical Engineering, 2022 The periodic and impact excitations caused by drum winding and interface misalignment of steel guides always result in hoisting instability in mine shafts.
Yu Zhu, Tong Xu, Chi Ma, Jiannan Yao
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Detection of periodic disturbances in LOFAR calibration solutions
2021 Signal Processing Symposium (SPSympo), 2021 The Earth’s ionosphere is a highly variable medium on a wide range of spatio-temporal scales. The responsiveness of plasma to the geomagnetic field and its changes gives rise to anisotropy, which may introduce wave-like characteristics while scanning the ionosphere with a line-of-sight towards a radio source.
Katarzyna Beser +3 more
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Long time behaviour of viscous scalar conservation laws
, 2008 This paper is concerned with the stability of stationary solutions of the conservation law $\partial_t u + \mathrm{div}_y A(y,u) -\Delta_y u=0$, where the flux $A$ is periodic with respect to its first variable.
Dalibard, Anne-Laure
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Detection of 3-Minute Oscillations in Full-Disk Ly$\alpha$ Emission During A Solar Flare [PDF]
, 2017 In this Letter we report the detection of chromospheric 3-minute oscillations in disk-integrated EUV irradiance observations during a solar flare. A wavelet analysis of detrended Lyman-alpha (from GOES/EUVS) and Lyman continuum (from SDO/EVE) emission ...
Dennis, Brian R. +4 more
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Shuiwen dizhi gongcheng dizhi, 2023 The borehole heat exchanger (BHE) is a key component using shallow geothermal energy in ground source heat pump systems (GSHPS), and reasonable pipe spacing design has a great impact on the heat transfer performance and economy of the GSHPs.
Jiashu LI +3 more
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State-dependent periodic adaptive disturbance compensation
IET Control Theory & Applications, 2007 The state-dependent nonlinear external disturbance compensation problem is considered. No prior information about the disturbance is assumed except the periodicity of the disturbance with respect to a state variable, which is termed a 'state-dependent periodic disturbance.' The key idea of the proposed new adaptive compensation method is to make use of
H.-S. Ahn, Y.Q. Chen
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Scientific Reports, 2017 Cooperation is fundamental to the survival of many bacterial species. Previous studies have shown that spatial structure can both promote and suppress cooperation.
Cortney E. Wilson +6 more
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