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김정주,전정일,변용규,노광춘,정정주,전태건,Kim, Chung-Joo,Chun, Jeong-Il,Byun, Yong-Kyu,Ro, Kwang-Choon,Chung, Chung-Choo,Jeong, Tae-Gun 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.11
As track density needs to increase to the order of 10, 000 tpi, the suspension has become a critical component in hard disk drives. One of the main obstacles to attain high track density is the structural resonances of the suspension in lateral direction. We investigate the suspension dynamics through the experimental modal analysis and the finite element method. An LDV (Laser Doppler Vibrometer) is employed to measure the response of the suspension which is excited by a shaker and an inpulse hammer for the free condition and the loaded condition, respectively. After comparing the experimental and numerical results, we study how the initial geometry of the bend region affects the suspension dynamics. It is found that the natural frequency of the sway mode decreases as the bend ratio and the bend angle increase. The shape of torsional mode changes as the mass of a slider increases, resulting in a local decrease in the natural frequency.
평면 실리콘 헤드를 사용한 하드 디스크 드라이브 시스템의 Average Bit Error Rate 시뮬레이션
서정욱(Jungwook Seo),조순철(Soonchul Jo),김용수(Young-Su Kim),노광춘(Chun-Kwang Ro) 한국자기학회 1998 韓國磁氣學會誌 Vol.8 No.6
The average bit error rate (ABER) for a hard disk drive (HDD) system using planar silicon heads was calculated. To calculate the ABER, the head field distribution using 3 dimensional finite element method and error rate response surface (ERRS) were obtained. Then the ABER was simulated by convolving the calculated ERRS with track misregistration(TMR). For the average bit error rate of 10^(-6) and the track pitch of 3.7 ㎛, the allowable TMR was 0.36 ㎛, about 9.7 % of the track pitch.