Pub Date : 2004-08-16DOI: 10.1109/APMRC.2004.1521943
C. Duan, G. Guo, T. Chong
A multirate discretization based adaptive feedforward compensation (AFC) scheme is proposed for repeatable runout (RRO) compensation in hard disk drive (HDD) digital servo systems. By discretizing the plant via multirate sampling, we can attain the inverse of the closed-loop transfer function no matter whether the closed-loop system is a minimum phase and causal system or not. The proposed scheme cancels selected RRO components rapidly without amplifying unselected higher harmonics. The scheme is applied to RRO compensation in a spin stand servo system. Simulation and experiment results show that the scheme can attenuate selected RRO harmonics effectively especially around 2 kHz which cannot be achieved by the conventional AFC scheme
{"title":"Robust periodic disturbance compensation via multirate control","authors":"C. Duan, G. Guo, T. Chong","doi":"10.1109/APMRC.2004.1521943","DOIUrl":"https://doi.org/10.1109/APMRC.2004.1521943","url":null,"abstract":"A multirate discretization based adaptive feedforward compensation (AFC) scheme is proposed for repeatable runout (RRO) compensation in hard disk drive (HDD) digital servo systems. By discretizing the plant via multirate sampling, we can attain the inverse of the closed-loop transfer function no matter whether the closed-loop system is a minimum phase and causal system or not. The proposed scheme cancels selected RRO components rapidly without amplifying unselected higher harmonics. The scheme is applied to RRO compensation in a spin stand servo system. Simulation and experiment results show that the scheme can attenuate selected RRO harmonics effectively especially around 2 kHz which cannot be achieved by the conventional AFC scheme","PeriodicalId":445247,"journal":{"name":"APMRC 2004 Asia-Pacific Magnetic Recording Conference, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124061367","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}
Pub Date : 2004-08-16DOI: 10.1109/APMRC.2004.1521965
Dae-Young Lee, Jaeho Lee, Jungho Hwang, S. Choa
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
{"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":null,"pages":null},"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}
Pub Date : 2004-08-16DOI: 10.1109/APMRC.2004.1521976
Yeon-Chul Song, Jun Jeong, Hyun-Seok Yang
In the track following problem of HDD, there are many disturbances such as windage, pivot friction, bias torque from flex cable, RRO, and noise. Especially, the windage is one of the major sources, and its magnitude increases drastically as the disk rotation speed increases. In this paper, a method to attenuate the influence of input torque disturbances is proposed by the use of an accelerometer. The disturbances are estimated from the accelerometer attached at the carriage of VCM actuator, and are feedbacked into the control input in order to attenuate its effect to PES in the multi-rate control framework. Experiment shows that the proposed method effectively decreases the influence of the windage in the low frequency range without increasing the control bandwidth
{"title":"On the improvement of tracking servo performance of HDD using accelerometer","authors":"Yeon-Chul Song, Jun Jeong, Hyun-Seok Yang","doi":"10.1109/APMRC.2004.1521976","DOIUrl":"https://doi.org/10.1109/APMRC.2004.1521976","url":null,"abstract":"In the track following problem of HDD, there are many disturbances such as windage, pivot friction, bias torque from flex cable, RRO, and noise. Especially, the windage is one of the major sources, and its magnitude increases drastically as the disk rotation speed increases. In this paper, a method to attenuate the influence of input torque disturbances is proposed by the use of an accelerometer. The disturbances are estimated from the accelerometer attached at the carriage of VCM actuator, and are feedbacked into the control input in order to attenuate its effect to PES in the multi-rate control framework. Experiment shows that the proposed method effectively decreases the influence of the windage in the low frequency range without increasing the control bandwidth","PeriodicalId":445247,"journal":{"name":"APMRC 2004 Asia-Pacific Magnetic Recording Conference, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130764911","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}
Pub Date : 1900-01-01DOI: 10.1109/APMRC.2004.1521970
Dae-Wee Kong, W. Joo
Laser sheet and digital camera was used for 2-dimensional visualization of the unsteady flow between co-rotating disks in air with a cylindrical enclosure. Geometric parameters are gap height between disks, and gap distance between disk tip and shroud. The lobe-structured boundary between inner region and outer region was detected by inserted particles, and the number of dominant vortices was determined clearly. It is found from flow visualization that the number of vortex cells can be correlated with Reynolds number based on height (H) between disks which is defined as ReH=UdotRH/v ranging from 7.96times10 2 to 1.43times104, and decreases as the disk speed increases. The lobe pattern by vortex cells is changed to a circular pattern for the wide gap than narrow one
{"title":"Visualization of dominant vortices between co-rotating disks in shroud without obstruction","authors":"Dae-Wee Kong, W. Joo","doi":"10.1109/APMRC.2004.1521970","DOIUrl":"https://doi.org/10.1109/APMRC.2004.1521970","url":null,"abstract":"Laser sheet and digital camera was used for 2-dimensional visualization of the unsteady flow between co-rotating disks in air with a cylindrical enclosure. Geometric parameters are gap height between disks, and gap distance between disk tip and shroud. The lobe-structured boundary between inner region and outer region was detected by inserted particles, and the number of dominant vortices was determined clearly. It is found from flow visualization that the number of vortex cells can be correlated with Reynolds number based on height (H) between disks which is defined as ReH=UdotRH/v ranging from 7.96times10 2 to 1.43times104, and decreases as the disk speed increases. The lobe pattern by vortex cells is changed to a circular pattern for the wide gap than narrow one","PeriodicalId":445247,"journal":{"name":"APMRC 2004 Asia-Pacific Magnetic Recording Conference, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117149523","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}
Pub Date : 1900-01-01DOI: 10.1109/APMRC.2004.1521973
H. Cho, C. Won, G. Ryu, D. Rhee, S. Hong
The present study investigates heat transfer and flow characteristics inside co-rotating disks simulated on the 3.5" hard disk drives (HDD). The experiments are conducted for the various operating conditions, such as hub height, rotating Reynolds number and head-arm length. A naphthalene sublimation technique is used to determine the detailed local heat transfer coefficients on the rotating disks. Numerical calculations are performed simultaneously to investigate the flow patterns induced by disk rotation. The results show that the heat transfer on the rotating disk is enhanced according to the increase of the rotating Reynolds number. The head arm inserted in the cavity between the rotating disk and the cover enhances uniformity of the heat/mass transfer on the disk due to the deficit of the momentum
{"title":"Local heat transfer and flow characteristics inside Co-rotating disks in HDD","authors":"H. Cho, C. Won, G. Ryu, D. Rhee, S. Hong","doi":"10.1109/APMRC.2004.1521973","DOIUrl":"https://doi.org/10.1109/APMRC.2004.1521973","url":null,"abstract":"The present study investigates heat transfer and flow characteristics inside co-rotating disks simulated on the 3.5\" hard disk drives (HDD). The experiments are conducted for the various operating conditions, such as hub height, rotating Reynolds number and head-arm length. A naphthalene sublimation technique is used to determine the detailed local heat transfer coefficients on the rotating disks. Numerical calculations are performed simultaneously to investigate the flow patterns induced by disk rotation. The results show that the heat transfer on the rotating disk is enhanced according to the increase of the rotating Reynolds number. The head arm inserted in the cavity between the rotating disk and the cover enhances uniformity of the heat/mass transfer on the disk due to the deficit of the momentum","PeriodicalId":445247,"journal":{"name":"APMRC 2004 Asia-Pacific Magnetic Recording Conference, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123944189","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}
Pub Date : 1900-01-01DOI: 10.1109/APMRC.2004.1521967
Yongsik Kim, K. Chung, Dae-Eun Kim
The reliability problem is crucial in micro-systems. In order to increase the reliability and durability, new lubrication is needed since conventional lubricant cannot be used in the micro-system. In this work, the fundamental tribological characteristics of perfluoropolyether (PFPE) Fomblin Zdol lubricants with different thickness coated on silicon by dip coating method were investigated. The Zdol lubricant was characterized by ellipsometry, contact angle measurement, X-ray photoelectron spectroscopy (XPS), and atomic force microscope (AFM). Especially, characteristics of unbonded Zdol films were compared with that of bonded Zdol films from the view point of stiction and friction. As a result, optimum thickness of unbonded as well as bonded Zdol film was proposed. Also, it was found that the Zdol films with only bonded fraction had lower stiction/friction coefficient than the Zdol film with unbonded and bonded fraction
{"title":"Micro-tribological characteristics of PFPE Zdol lubricant coated on silicon","authors":"Yongsik Kim, K. Chung, Dae-Eun Kim","doi":"10.1109/APMRC.2004.1521967","DOIUrl":"https://doi.org/10.1109/APMRC.2004.1521967","url":null,"abstract":"The reliability problem is crucial in micro-systems. In order to increase the reliability and durability, new lubrication is needed since conventional lubricant cannot be used in the micro-system. In this work, the fundamental tribological characteristics of perfluoropolyether (PFPE) Fomblin Zdol lubricants with different thickness coated on silicon by dip coating method were investigated. The Zdol lubricant was characterized by ellipsometry, contact angle measurement, X-ray photoelectron spectroscopy (XPS), and atomic force microscope (AFM). Especially, characteristics of unbonded Zdol films were compared with that of bonded Zdol films from the view point of stiction and friction. As a result, optimum thickness of unbonded as well as bonded Zdol film was proposed. Also, it was found that the Zdol films with only bonded fraction had lower stiction/friction coefficient than the Zdol film with unbonded and bonded fraction","PeriodicalId":445247,"journal":{"name":"APMRC 2004 Asia-Pacific Magnetic Recording Conference, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123080430","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}
Pub Date : 1900-01-01DOI: 10.1109/APMRC.2004.1521926
Ji-Min Han, Y. Um, JinWoo Yoo, Yoon-Chui Rhim
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.
{"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":null,"pages":null},"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}
Pub Date : 1900-01-01DOI: 10.1109/APMRC.2004.1521972
H. Cho, C. Won, D. Rhee, S. Hong
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
{"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":null,"pages":null},"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}
Pub Date : 1900-01-01DOI: 10.1109/APMRC.2004.1521971
Dae-Wee Kong, W. Joo
The trend in the computer industry to produce smaller disk drives rotating at higher speeds requires an improved understanding of fluid motion in the space between disks. The distribution of pressure disturbance on disks has relation to flow structure. To investigate the flow structure, the circumferential velocity was obtained using hot-wire measurements for the flow between the center pair of four disks of common radius R2 co-rotating at angular velocity Ω in a fixed cylindrical enclosure. Disk radius is about 4 times larger than usual one of HDD to detect detail velocity profile. Hot-wire supporter acts as an obstruction in this case. The effects of rotating speed on large flow oscillation in outer region with hotwire supporter were investigated.
{"title":"The effect of rod obstruction on transition speed of large flow oscillation in co-rotating disks","authors":"Dae-Wee Kong, W. Joo","doi":"10.1109/APMRC.2004.1521971","DOIUrl":"https://doi.org/10.1109/APMRC.2004.1521971","url":null,"abstract":"The trend in the computer industry to produce smaller disk drives rotating at higher speeds requires an improved understanding of fluid motion in the space between disks. The distribution of pressure disturbance on disks has relation to flow structure. To investigate the flow structure, the circumferential velocity was obtained using hot-wire measurements for the flow between the center pair of four disks of common radius R2 co-rotating at angular velocity Ω in a fixed cylindrical enclosure. Disk radius is about 4 times larger than usual one of HDD to detect detail velocity profile. Hot-wire supporter acts as an obstruction in this case. The effects of rotating speed on large flow oscillation in outer region with hotwire supporter were investigated.","PeriodicalId":445247,"journal":{"name":"APMRC 2004 Asia-Pacific Magnetic Recording Conference, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121405807","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}
Pub Date : 1900-01-01DOI: 10.1109/apmrc.2004.1521952
D. Oh, J. Koo, C. Kim, Y. Byun
A development of optimized design process for a high performance actuator is presented in this article. A PES (Position Error Signal) estimator employing both numerical model and experimental data is developed for effective and accurate optimization process. Statistically formulated optimization method presented here delivers not only wide bandwidth actuator design for PES reduction but higher shock proof HDA design. Besides the presented method incorporates volume production parameters so that designers are able to expect design tolerance and cost relations
{"title":"Optimization of wide bandwidth hard disk drive actuator design using statistical methods","authors":"D. Oh, J. Koo, C. Kim, Y. Byun","doi":"10.1109/apmrc.2004.1521952","DOIUrl":"https://doi.org/10.1109/apmrc.2004.1521952","url":null,"abstract":"A development of optimized design process for a high performance actuator is presented in this article. A PES (Position Error Signal) estimator employing both numerical model and experimental data is developed for effective and accurate optimization process. Statistically formulated optimization method presented here delivers not only wide bandwidth actuator design for PES reduction but higher shock proof HDA design. Besides the presented method incorporates volume production parameters so that designers are able to expect design tolerance and cost relations","PeriodicalId":445247,"journal":{"name":"APMRC 2004 Asia-Pacific Magnetic Recording Conference, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133588946","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}
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