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점탄성 댐핑 물질을 이용한 하드 디스크 드라이브의 NRRO저감
장건희,홍선주,한재혁,김동균 한국소음진동공학회 1999 소음 진동 Vol.9 No.6
This research investigates the characteristicsw of NRRO in a 2.5' HDD by using FEM, modal testing and runout analysis, and reduces NRRO using visco-elastic damping material. Most frequency components of NRRO are generated by the defects of ball and rotating race, and they can be determined by the kinematic analysis of ball bearing. It also proposes the novel design of a spindle motor that can reduce NRRO effectively by inserting the visco-elastic damping material to one of the transmission path of NRRO, i.e., where the strain energy is highly concentrate. By this technique, NRRO is reduced by 27%. 27%.
볼 베어링에 의해 발생하는 HDD 회전축계 NRRO의 온도 상승에 따른 변화
김동균(Kim, D.K.),장건희(Jang, G.H.) 한국소음진동공학회 2004 한국소음진동공학회 논문집 Vol.14 No.9
This research investigates the non-repeatable runout (NRRO) of a HDD spindle system at elevated temperature by analyzing the characteristics of a ball bearing and the natural vibration characteristics of a HDD spindle system due to the effect of elevated temperature. It shows that the elevated temperature results in the increase of the contact angle and the decrease of the deformation of the ball bearing in a HDD spindle system. The variation of bearing frequencies, which are dependent on the cosine function of contact angle, is almost negligible at elevated temperature. However, the decrease of bearing deformation at elevated temperature reduces the stiffness of the ball bearing and the natural frequencies of a HDD spindle system consequently. The latter has a significant effect on the amplitude and the frequency distribution of NRRO at elevated temperature.
초고밀도 디스크 드라이브를 위한 반 진공 작동 환경에서 서보 트랙 기록 방법에 의한 RRO 저감에 대한 연구
한윤식,강심우 한국소음진동공학회 2004 한국소음진동공학회 논문집 Vol.14 No.11
In high-capacity disk drives with ever-growing track density, the allowable level of position error signal(PES) is becoming smaller and smaller. In order to achieve the high TPI(track per inch) disk drive, it is necessary to improve the writing accuracy during the servo track writing(STW) Process through the reduction of track mis-registration sources. Among the main contributors of the non-repeatable runout(NRRO) PES, the disk vibration and the head-stack assembly vibration is considered to be one of the most significant factors. Also the most contributors of repeatable runout(RRO) come from the contributors of NRRO which is written-in at the time of STW process. In this paper, the effect of NRRO on servo written-in RRO is Investigated by experimentally, and the experimental result shows that the written-in RRO can be effectively reduced through a STW process under low dense medium condition such as semi-vacuum.