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Active correction of mass imbalance for a precise rotor 精密转子质量不平衡的主动校正
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 1900-01-01 DOI: 10.1109/APMRC.2009.4925392
J. K. Lee, Y. Ihn, J. Koo, D. Oh, Ho Sung Lee
{"title":"Active correction of mass imbalance for a precise rotor","authors":"J. K. Lee, Y. Ihn, J. Koo, D. Oh, Ho Sung Lee","doi":"10.1109/APMRC.2009.4925392","DOIUrl":"https://doi.org/10.1109/APMRC.2009.4925392","url":null,"abstract":"An active mass imbalance correction method for a precision rotor that is formulated iteratively is introduced. Since mass imbalance of a precise rotor has been one of the critical volume production issues for a long time especially in the data storage industry, various imbalance correction methods are developed and successfully implemented. Nevertheless, volume manufacturing tolerance of the mass imbalance has ever been tightened up as the data storage density has been increased. Recognizing the limitation of the practicality of fine-tuned rotor balance for volume production, development of an adaptive dynamic rotor balance scheme is of great worth. In the present work an application of frequency based control method popularly used for repeatable runout compensation to the mass imbalance reduction enables reliable accurate balancing of precise rotor.","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131807340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Mechanical performance study of pattern media based head-disk systems 基于模式介质的磁碟系统力学性能研究
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 1900-01-01 DOI: 10.1109/apmrc.2009.4925366
S. Shen, Bo Liu, Shengkai Yu, H. Du
{"title":"Mechanical performance study of pattern media based head-disk systems","authors":"S. Shen, Bo Liu, Shengkai Yu, H. Du","doi":"10.1109/apmrc.2009.4925366","DOIUrl":"https://doi.org/10.1109/apmrc.2009.4925366","url":null,"abstract":"In the pursuit of areal recording densities towards 10 Tb/in2, patterned media technology as well as the technology to reduce magnetic spacing between the slider and disk have attracted great attention. As a result, contact stresses can be encountered at the head-disk interface (HDI). Detailed knowledge of the stress distribution due to inelastic deformation at asperity microcontacts is therefore of great importance. An elastic-plastic contact analysis for the HDI that is based on a finite element model and two typical pattern media cases is presented in this work. Simulation results for the contact pressure at asperity microcontacts and subsurface von Mises equivalent stress are interpreted in terms of two typical pattern media cases.","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115516410","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Position error predictions of a hard disk drive undergoing a large seeking motion with shock excitations 在激波激励下进行大寻道运动的硬盘驱动器位置误差预测
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 1900-01-01 DOI: 10.1109/apmrc.2009.4925372
Tsung-Liang Wu, I. Shen
{"title":"Position error predictions of a hard disk drive undergoing a large seeking motion with shock excitations","authors":"Tsung-Liang Wu, I. Shen","doi":"10.1109/apmrc.2009.4925372","DOIUrl":"https://doi.org/10.1109/apmrc.2009.4925372","url":null,"abstract":"In this digest, we present a numerical simulation to predict position errors of a hard disk drive undergoing a long seeking-and-settling process while experiencing a shock excitation. The seeking-and-settling process consists of four segments: acceleration, coasting, deceleration, and settling. A 2-ms shock excitation is applied to each segment of the seeking-and-settling process respectively to evaluate the severity of the shock excitations to position errors. Simulation results lead to two significant conclusions. First, shock excitations occurring near the end of the seeking-and-settling process are more detrimental causing larger position errors. Second, the ability to rapidly reduce the position errors relies on performance and properties of fluid-dynamic spindle motors.","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"123 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115588943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Smoothing position error signal corrupted by impulse disturbance 平滑受脉冲干扰的位置误差信号
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 1900-01-01 DOI: 10.1109/apmrc.2009.4925391
C. Du, Z. Ye, T. Gao, L. Xie, J. Zhang, Y. Wang
{"title":"Smoothing position error signal corrupted by impulse disturbance","authors":"C. Du, Z. Ye, T. Gao, L. Xie, J. Zhang, Y. Wang","doi":"10.1109/apmrc.2009.4925391","DOIUrl":"https://doi.org/10.1109/apmrc.2009.4925391","url":null,"abstract":"This paper proposes a filtering method to filter out impulses in the position error signal (PES) due to corrupt servo pattern or demodulation timing in hard disk drives. The impulse disturbance, leading to a sudden change in PES; may be distributed separately or consecutively. A nonlinear switched filtering method is used to smooth the PES before feeding into servo controller. With the nonlinear switched filter, the PES is significantly reduced without degrading the stability and bandwidth of the servo loop under certain conditions.","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117090085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Spreading properties of monolayer lubricant films: Effect of bonded molecules 单层润滑膜的涂膜性能:键合分子的影响
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 1900-01-01 DOI: 10.1109/apmrc.2009.4925422
S. Itoh, K. Takahashi, K. Fukuzawa, H. Zhang
{"title":"Spreading properties of monolayer lubricant films: Effect of bonded molecules","authors":"S. Itoh, K. Takahashi, K. Fukuzawa, H. Zhang","doi":"10.1109/apmrc.2009.4925422","DOIUrl":"https://doi.org/10.1109/apmrc.2009.4925422","url":null,"abstract":"Monolayer lubricant films applied to head disk interface of hard disk drives consist of bonded and mobile molecules. We measured the diffusion coefficient of mobile molecules which spread through the spaces that were not covered with bonded molecules, and revealed its dependence on the coverage and the conformation of bonded molecules.","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125033424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Conformation of ultra-thin PFPE lubricant with different structure on magnetic disks - direct observation and MD simulation - 不同结构的超薄PFPE润滑油在磁盘上的构象——直接观察与MD模拟
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 1900-01-01 DOI: 10.1109/apmrc.2009.4925421
H. Tani, K. Sakamoto, N. Tagawa
{"title":"Conformation of ultra-thin PFPE lubricant with different structure on magnetic disks - direct observation and MD simulation -","authors":"H. Tani, K. Sakamoto, N. Tagawa","doi":"10.1109/apmrc.2009.4925421","DOIUrl":"https://doi.org/10.1109/apmrc.2009.4925421","url":null,"abstract":"Three kinds of PFPE lubricants (Z-tetraol, TA-30, D-4OH) with different molecular structures were coated on the magnetic disks, then we confirmed the film conformation of these lubricants on the disks by the AFM with the fluoride coated probe. The film conformations of these lubricant films were different. Z-tetraol showed highest film thickness and lower coverage in these lubricants. TA-30 showed double layers structure and highest coverage. D-4OH showed monolayer and higher coverage than Z-tetraol. These observed results agreed with the molecular dynamics simulation results. In this simulation, TA-30 showed highest coverage and lowest thickness, because TA-30 molecule did not form the random coil shape, and it adsorbed rigidly on the disk surface. Z-tetraol adsorbed as the random coil shape. D-4OH adsorbed as the spiral shape.","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127625001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Perspectives of magnetic recording system at 10 Tb/in2 10tb /in2磁记录系统的展望
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 1900-01-01 DOI: 10.1109/apmrc.2009.4925387
Zhi-Min Yuan, Bo Liu, T. Zhou, C. Goh, C. Ong, Li Wang
{"title":"Perspectives of magnetic recording system at 10 Tb/in2","authors":"Zhi-Min Yuan, Bo Liu, T. Zhou, C. Goh, C. Ong, Li Wang","doi":"10.1109/apmrc.2009.4925387","DOIUrl":"https://doi.org/10.1109/apmrc.2009.4925387","url":null,"abstract":"Due to the superparamagnetism, the configuration of magnetic recording system has to be changed in order to enhance the writing capability or to reduce the number of grains per bit. The next target of magnetic recording research is to enable HDD technologies at the areal density of 10 Tb/in2. This work studies the feasibility and the requirement to implement the magnetic recording system at 10 Tb/in2. From the analysis of two possible approaches: the energy assisted magnetic recording (EAMR) on granular media and the bit patterned media (BPM) with EAMR, the simulation based virtual design of magnetic recording system at 10 Tb/in2 is proposed.","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"48 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132624186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 15
A numerical study of the operational shock response in a hard disk drive using the discrete stiffness method 用离散刚度法对硬盘驱动器的工作冲击响应进行了数值研究
2009 Asia-Pacific Magnetic Recording Conference Pub Date : 1900-01-01 DOI: 10.1109/APMRC.2009.4925408
Hao Zheng, Hui Li, F. Talke
{"title":"A numerical study of the operational shock response in a hard disk drive using the discrete stiffness method","authors":"Hao Zheng, Hui Li, F. Talke","doi":"10.1109/APMRC.2009.4925408","DOIUrl":"https://doi.org/10.1109/APMRC.2009.4925408","url":null,"abstract":"The flying stability of hard disk drives (HDDs) during operational shock has become increasingly more important as the flying height of the head/disk interface has been reduced to the sub-10 nm flying height regime. In this paper, the dynamic response of a femto slider due to operational shock is investigated. The air bearing is modeled with six linear springs using the “discrete stiffness method”.","PeriodicalId":376463,"journal":{"name":"2009 Asia-Pacific Magnetic Recording Conference","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128497264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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