The Experts below are selected from a list of 372 Experts worldwide ranked by ideXlab platform
Yangquan Chen - One of the best experts on this subject based on the ideXlab platform.
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Pre-filtering and head-dependent adaptive feed-forward compensation for translation vibration in Hard-Disc-Drive
Mechatronics, 2015Co-Authors: Ying Luo, Li Zhou, Yangquan ChenAbstract:Abstract This paper suggests a head-dependent adaptive feed-forward (AFF) control scheme with pre-filtering for vibration compensation in single input single output Hard-Disc-Drive (HDD) servo system. First, an AFF algorithm is designed and implemented for the translation vibration compensation in the servo system. In order to improve the vibration compensation performance significantly, a pre-filtering process is added in the AFF scheme. Meanwhile, a head-dependent AFF control strategy is proposed and implemented to accommodate the dynamics variations in HDD servo system. This head-dependent AFF control scheme improves the vibration compensation performance in consistency. The proposed head-dependent AFF control scheme with pre-filtering is validated by the Drive level experiments with significant performance improvement for vibration compensation in high density HDD servo system.
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disturbance observer design with bode s ideal cut off filter in Hard Disc Drive servo system
Mechatronics, 2013Co-Authors: Tao Zhang, Changik Kang, Yangquan ChenAbstract:In order to improve the disturbance compensation performance under vibrations in Hard-Disc-Drive servo system, Bode’s ideal cut-off (BICO) filter is applied for the disturbance observer (DOB) design. New DOB is designed with BICO low pass filter (LPF) substituting the normal LPF in the original DOB design. With this BICO LPF, the new DOB can achieve strengthened attenuation of error sensitivity in disturbance frequency range to obtain better disturbance compensation performance while maintaining the robust specifications. This benefit comes from the less phase loss property of the BICO filter. Meanwhile, the BICO filter with the property of sharp roll-off magnitude is applied for the disturbance frequency range detection filter design. Using this BICO identification filter, multiple-DOB control can be used for the disturbance compensation based on the switching according to the disturbance detection. Industrial Drive level experimental results are included to validate the proposed new DOB scheme under vibration.
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pre filtering and head dependent adaptive feed forward compensation for linear vibration in Hard Disc Drive
Advances in Computing and Communications, 2012Co-Authors: Ying Luo, Li Zhou, Tao Zhang, Bongjin Lee, Changik Kang, Yangquan ChenAbstract:This paper suggests a pre-filtering and head-dependent adaptive feed-forward (AFF) control scheme for vibration compensation in Hard-Disc-Drive (HDD) servo system. First, an AFF algorithm is designed and implemented for the linear vibration compensation in the servo system. In order to improve the vibration compensation performance significantly, a pre-filtering process is added in the AFF scheme. Meanwhile, a head-dependent AFF control strategy is proposed and implemented to accommodate the dynamics variations in HDD servo system. This head-dependent AFF control scheme improves the vibration compensation performance in consistency. The proposed pre-filtering and head-dependent AFF control scheme is validated by the Drive level experiments with significant performance improvement for vibration compensation in high density HDD servo system.
Ying Luo - One of the best experts on this subject based on the ideXlab platform.
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Pre-filtering and head-dependent adaptive feed-forward compensation for translation vibration in Hard-Disc-Drive
Mechatronics, 2015Co-Authors: Ying Luo, Li Zhou, Yangquan ChenAbstract:Abstract This paper suggests a head-dependent adaptive feed-forward (AFF) control scheme with pre-filtering for vibration compensation in single input single output Hard-Disc-Drive (HDD) servo system. First, an AFF algorithm is designed and implemented for the translation vibration compensation in the servo system. In order to improve the vibration compensation performance significantly, a pre-filtering process is added in the AFF scheme. Meanwhile, a head-dependent AFF control strategy is proposed and implemented to accommodate the dynamics variations in HDD servo system. This head-dependent AFF control scheme improves the vibration compensation performance in consistency. The proposed head-dependent AFF control scheme with pre-filtering is validated by the Drive level experiments with significant performance improvement for vibration compensation in high density HDD servo system.
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pre filtering and head dependent adaptive feed forward compensation for linear vibration in Hard Disc Drive
Advances in Computing and Communications, 2012Co-Authors: Ying Luo, Li Zhou, Tao Zhang, Bongjin Lee, Changik Kang, Yangquan ChenAbstract:This paper suggests a pre-filtering and head-dependent adaptive feed-forward (AFF) control scheme for vibration compensation in Hard-Disc-Drive (HDD) servo system. First, an AFF algorithm is designed and implemented for the linear vibration compensation in the servo system. In order to improve the vibration compensation performance significantly, a pre-filtering process is added in the AFF scheme. Meanwhile, a head-dependent AFF control strategy is proposed and implemented to accommodate the dynamics variations in HDD servo system. This head-dependent AFF control scheme improves the vibration compensation performance in consistency. The proposed pre-filtering and head-dependent AFF control scheme is validated by the Drive level experiments with significant performance improvement for vibration compensation in high density HDD servo system.
Richard Whittington - One of the best experts on this subject based on the ideXlab platform.
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Playing by the Rules: Institutional Foundations of Success and Failure in the Taiwanese IT Industry Shih-Chang Hung
2011Co-Authors: National Tsing, Hua University, Richard WhittingtonAbstract:This paper examines the different growth trajectories of the personal importance of coherent and relatively stable national institu-computer, Hard Disc Drive, and software sectors in Taiwan since the 1980s. tional arrangements for economic performance. Within the Taking an institutionalist perspective, we emphasize the importance of science policy field, researchers have similarly pointed to the institutionalized rules of the game in shaping economic behavior within institutionalization of technologies into self-reinforcing “tra-social systems. We explain success and failure in the three sectors according jectories, ” “paradigms, ” or “dominant designs ” (Dosi, 1984; to different degrees of fit between the rules of the Taiwanese national Sahal, 1985; Utterback and Suárez, 1993). Both literatures system of production and the rules of the respective technology systems. highlight the importance for success of being able to play by Implications for business and government policy are drawn out. J BUSN the institutionalized “rules of the game ” within a particula
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playing by the rules institutional foundations of success and failure in the taiwanese it industry
Journal of Business Research, 2000Co-Authors: Shihchang Hung, Richard WhittingtonAbstract:This paper examines the different growth trajectories of the personal computer, Hard Disc Drive, and software sectors in Taiwan since the 1980s. Taking an institutionalist perspective, we emphasize the importance of institutionalized rules of the game in shaping economic behavior within social systems. We explain success and failure in the three sectors according to different degrees of fit between the rules of the Taiwanese national system of production and the rules of the respective technology systems. Implications for business and government policy are drawn out.
D B Bogy - One of the best experts on this subject based on the ideXlab platform.
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Hard Disc Drive air bearing design modified direct algorithm and its application to slider air bearing surface optimization
Tribology International, 2004Co-Authors: Hong Zhu, D B BogyAbstract:Hard disk Drives continue to increase in areal data density. This requires air bearing sliders with lower and lower flying heights (FH). Also the uniformity of the FH and the flatness of the roll profile with radius become more critical as the FH gets lower. By using modern optimization techniques, it is possible to optimize slider air bearing surface (ABS) designs according to multiple design goals. In this paper, we Discuss two modifications to the DIRECT algorithm: one to handle tolerance and one to deal with hidden constraints. Some numerical experiments were carried out using these modifications and the modified DIRECT algorithm was applied to slider ABS optimization. The results show that these two modifications can improve the efficiency of the DIRECT algorithm and they also provide more flexibility in slider ABS optimization.
Li Zhou - One of the best experts on this subject based on the ideXlab platform.
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Pre-filtering and head-dependent adaptive feed-forward compensation for translation vibration in Hard-Disc-Drive
Mechatronics, 2015Co-Authors: Ying Luo, Li Zhou, Yangquan ChenAbstract:Abstract This paper suggests a head-dependent adaptive feed-forward (AFF) control scheme with pre-filtering for vibration compensation in single input single output Hard-Disc-Drive (HDD) servo system. First, an AFF algorithm is designed and implemented for the translation vibration compensation in the servo system. In order to improve the vibration compensation performance significantly, a pre-filtering process is added in the AFF scheme. Meanwhile, a head-dependent AFF control strategy is proposed and implemented to accommodate the dynamics variations in HDD servo system. This head-dependent AFF control scheme improves the vibration compensation performance in consistency. The proposed head-dependent AFF control scheme with pre-filtering is validated by the Drive level experiments with significant performance improvement for vibration compensation in high density HDD servo system.
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pre filtering and head dependent adaptive feed forward compensation for linear vibration in Hard Disc Drive
Advances in Computing and Communications, 2012Co-Authors: Ying Luo, Li Zhou, Tao Zhang, Bongjin Lee, Changik Kang, Yangquan ChenAbstract:This paper suggests a pre-filtering and head-dependent adaptive feed-forward (AFF) control scheme for vibration compensation in Hard-Disc-Drive (HDD) servo system. First, an AFF algorithm is designed and implemented for the linear vibration compensation in the servo system. In order to improve the vibration compensation performance significantly, a pre-filtering process is added in the AFF scheme. Meanwhile, a head-dependent AFF control strategy is proposed and implemented to accommodate the dynamics variations in HDD servo system. This head-dependent AFF control scheme improves the vibration compensation performance in consistency. The proposed pre-filtering and head-dependent AFF control scheme is validated by the Drive level experiments with significant performance improvement for vibration compensation in high density HDD servo system.
