APMRC 2004 Asia-Pacific Magnetic Recording Conference, 2004.最新文献_第4页

Robust periodic disturbance compensation via multirate control 基于多速率控制的鲁棒周期性扰动补偿

APMRC 2004 Asia-Pacific Magnetic Recording Conference, 2004. Pub Date : 2004-08-16 DOI: 10.1109/APMRC.2004.1521943

C. Duan, G. Guo, T. Chong

引用次数: 5

Effect of relative humidity, disk acceleration, and dwell time on tribocharge build-up at a slider disk interface 相对湿度、磁盘加速度和停留时间对滑动磁盘界面上摩擦电荷积累的影响

APMRC 2004 Asia-Pacific Magnetic Recording Conference, 2004. Pub Date : 2004-08-16 DOI: 10.1109/APMRC.2004.1521965

Dae-Young Lee, Jaeho Lee, Jungho Hwang, S. Choa

{"title":"Effect of relative humidity, disk acceleration, and dwell time on tribocharge build-up at a slider disk interface","authors":"Dae-Young Lee, Jaeho Lee, Jungho Hwang, S. Choa","doi":"10.1109/APMRC.2004.1521965","DOIUrl":"https://doi.org/10.1109/APMRC.2004.1521965","url":null,"abstract":"High performance disk drives require high spindle speed. The spindle speed of typical hard disk drives has increased in recent years. The increasing disk velocity leads to increasing disk acceleration and slider-disk interaction. The slider-disk interaction in CSS (contact-start-stop) mode is an important source of particle generation and tribocharge. Charge build-up in the slider-disk interface can cause ESD (electrostatic discharge) damage and lubricant decomposition. We measured the tribocurrent/voltage build-up generated at increasing disk acceleration. In addition, we examined the effects of relative humidity and dwell time on the tribocharge build-up. We found that the tribocurrent/voltage was generated during pico-slider/disk interaction and its level was about 3-16 pA and 0.1-0.3 V, respectively. Tribocurrent/voltage build-up was reduced with increasing disk acceleration. Higher humidity conditions (75 -80%) yielded lower levels of tribovoltage/current. Dwell time affected the charge build-up at the slider-disk interface. The degree of tribocharge build-up increased with increasing dwell time","PeriodicalId":445247,"journal":{"name":"APMRC 2004 Asia-Pacific Magnetic Recording Conference, 2004.","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132961191","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

On the improvement of tracking servo performance of HDD using accelerometer 利用加速度计改善硬盘跟踪伺服性能的研究

APMRC 2004 Asia-Pacific Magnetic Recording Conference, 2004. Pub Date : 2004-08-16 DOI: 10.1109/APMRC.2004.1521976

Yeon-Chul Song, Jun Jeong, Hyun-Seok Yang

引用次数: 0

Visualization of dominant vortices between co-rotating disks in shroud without obstruction 无遮挡的翼罩共转盘间优势涡的可视化

APMRC 2004 Asia-Pacific Magnetic Recording Conference, 2004. Pub Date : 1900-01-01 DOI: 10.1109/APMRC.2004.1521970

Dae-Wee Kong, W. Joo

引用次数: 0

Local heat transfer and flow characteristics inside Co-rotating disks in HDD 硬盘同向旋转盘内局部传热与流动特性

APMRC 2004 Asia-Pacific Magnetic Recording Conference, 2004. Pub Date : 1900-01-01 DOI: 10.1109/APMRC.2004.1521973

H. Cho, C. Won, G. Ryu, D. Rhee, S. Hong

引用次数: 0

Micro-tribological characteristics of PFPE Zdol lubricant coated on silicon 硅包覆PFPE Zdol润滑油的微摩擦学特性

APMRC 2004 Asia-Pacific Magnetic Recording Conference, 2004. Pub Date : 1900-01-01 DOI: 10.1109/APMRC.2004.1521967

Yongsik Kim, K. Chung, Dae-Eun Kim

引用次数: 0

Experimental and numerical studies about the effect of airflow on slider vibration with and without a disk damper 气流对带和不带圆盘阻尼器滑块振动影响的实验和数值研究

APMRC 2004 Asia-Pacific Magnetic Recording Conference, 2004. Pub Date : 1900-01-01 DOI: 10.1109/APMRC.2004.1521926

Ji-Min Han, Y. Um, JinWoo Yoo, Yoon-Chui Rhim

{"title":"Experimental and numerical studies about the effect of airflow on slider vibration with and without a disk damper","authors":"Ji-Min Han, Y. Um, JinWoo Yoo, Yoon-Chui Rhim","doi":"10.1109/APMRC.2004.1521926","DOIUrl":"https://doi.org/10.1109/APMRC.2004.1521926","url":null,"abstract":"As the recording density and data transfer rate of a hard disk drive increase, TPI and rotational speed have been increased so that a single actuator alone may not be enough to control TMR budget. High-speed rotation of a disk induces airflow inside HDD cavity and the influence of airflow on HSA has become critical as TPI increases. A disk damper, which is designed to suppress the disk flutter, changes the airflow significantly so that the E-block and slider are open to the flow with relatively large pressure fluctuation. The effect of disk damper shape on the airflow field is studied numerically and experimentally from the aerodynamic point of view. Unsteady airflow in HDD cavity is simulated numerically by using a large eddy simulation method and frequency spectrum of the pressure fluctuation near the slider is obtained. Numerical results are compared with experimental results for three different-shape disk dampers and two types of E-blocks. The relationship is analyzed between the vibration of the slider and the pressure fluctuation of the airflow near the slider. A newly proposed shape of disk damper shows good characteristics on suppressing the vibration of the slider due to the airflow.","PeriodicalId":445247,"journal":{"name":"APMRC 2004 Asia-Pacific Magnetic Recording Conference, 2004.","volume":"13 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":"133125517","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: 2

Local heat transfer characteristics in HDD with ventilation hub 带通风枢纽的硬盘局部换热特性

APMRC 2004 Asia-Pacific Magnetic Recording Conference, 2004. Pub Date : 1900-01-01 DOI: 10.1109/APMRC.2004.1521972

H. Cho, C. Won, D. Rhee, S. Hong

{"title":"Local heat transfer characteristics in HDD with ventilation hub","authors":"H. Cho, C. Won, D. Rhee, S. Hong","doi":"10.1109/APMRC.2004.1521972","DOIUrl":"https://doi.org/10.1109/APMRC.2004.1521972","url":null,"abstract":"The purpose of this study is to investigate heat/mass transfer and flow characteristics inside co-rotating disks with hub having ventilation holes. Naphthalene sublimation technique is employed to determine the local heat/mass transfer coefficients on the rotating disks using the heat and mass transfer analogy. Flow field measurements are conducted using laser Doppler anemometry (LDA) and numerical calculations are performed simultaneously to analyze the flow patterns induced by the disk rotation. The experiments are conducted for the Rossby number of 0.04, 0.1, and 0.35 to evaluate the influence of incoming flows through the holes on the hub. The basic flow structure in a cavity between co-rotating disks consists of three regions; the solid-body rotating inner region, the outer region with unsteady vortices and the shroud boundary layer region. The heat/mass transfer rates on the co-rotating disks are very low near the hub due to the solid-body rotation and increase rapidly in the outer region due to turbulence mixing. The modified hub with the ventilation holes enhances significantly the heat/mass transfer rates on the region near the hub","PeriodicalId":445247,"journal":{"name":"APMRC 2004 Asia-Pacific Magnetic Recording Conference, 2004.","volume":"1 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":"127291691","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

The effect of rod obstruction on transition speed of large flow oscillation in co-rotating disks 杆阻对同转盘大流量振荡过渡速度的影响

APMRC 2004 Asia-Pacific Magnetic Recording Conference, 2004. Pub Date : 1900-01-01 DOI: 10.1109/APMRC.2004.1521971

Dae-Wee Kong, W. Joo

引用次数: 0

Optimization of wide bandwidth hard disk drive actuator design using statistical methods 应用统计方法优化宽带硬盘驱动器驱动器设计

APMRC 2004 Asia-Pacific Magnetic Recording Conference, 2004. Pub Date : 1900-01-01 DOI: 10.1109/apmrc.2004.1521952

D. Oh, J. Koo, C. Kim, Y. Byun

引用次数: 3