정보저장기기용 초정밀 회전체의 회전유동 가진 해석 및 유체베어링 설계 = Parametric design of fluid dynamic bearing and rotational flow analysis for data storage devices

다국어 초록 (Multilingual Abstract)

As functional requirement of massive digital information storage devices are on a trend for the higher data transfer rate and lower cost, many different technical efforts are being tested and implemented in the industry.
High speed rotating airflow inside a HDD chamber causes sub-micron scale disk vibration that could generate significant TMR problems in most of current HDD products. Many publications are presented for the reduction of airflow excitation. One of the most effective methods widely adopted in high-end HDD products is Squeeze Air Bearing Plate (SABP). However, because of its tight assembly clearance between the damper and disk, this method could not be easily implemented in volume production. This article presents a disk damper design that is modified to be feasible for volume production by virtue of a new airflow modeling method
On the other side FDB(Fluid Dynamic Bearing) is one of the major breakthroughs in rotor design in terms of TMR budget. Although FDB analysis based on Reynolds' equation is well established and popularly being used for FDB design especially for the estimation of bearing stiffness, there are obvious limitations in the approach due to the inherent assumptions. A generalized analysis tool employing the full Navier-Stokes equation and the energy balance is to be beneficial for detailed FDB design. In this publication, an efficient geometry modeling method is presented that provides fully integrated inputs for general FVM/FDM codes. By virtue of the flexibility of the presented method, many different detailed FDB design and analysis are carried over with ease.

목차 (Table of Contents)

• 목차 = iv
• List of Table = vi
• List of Figures = vii
• 1. 서론 = 1
• 1.1 연구배경 = 1
• 1.2 연구 목적 = 4
• 1.2.1 유체유동 해석 기법 확립 = 4
• 1.2.2 하드디스크 내부 유체유동 해석 = 4
• 1.2.3 FDB Modeling의 자동화 기법확립 = 5
• 1.2.4 FDB 동특성 계수 해석 = 5
• 2. 유체 유동 해석 기법 확립 = 5
• 2.1 해석 대상의 형상 단순화 = 6
• 2.1.1 디스크 회전체 단순화 = 6
• 2.1.2 Cover, Base 형상 단순화 = 7
• 2.2 유동유체해석 = 7
• 2.2.1 해석 방법 = 7
• 2.2.2 비교대상 선정 = 14
• 2.3 Geometry set up 및 해석 = 14
• 2.3.1 Cover & Base Gap Effect = 14
• 2.3.2 Shroud Effect = 15
• 2.3.3 Damper Effect = 15
• 2.3.4 Full Base Damper Effect = 16
• 2.4 해석결과 = 16
• 2.4.1 Cover & Base Gap Effect = 16
• 2.4.2 Shroud Effect = 17
• 2.4.3 Damper Effect = 18
• 2.4.4 Full Base Damper Effect = 18
• 3. FDB Moeling의 자동화 기법확립 = 19
• 3.1 해석 대상의 형상 분석 = 20
• 3.1.1 FDB Modeling의 자동화 (Radial Bearing) = 20
• 3.1.2 FDB Modeling의 자동화(Axail Bearing) = 22
• 3.2 유동유체 해석 = 22
• 3.2.1 해석 방법 = 22
• 3.2.2 비교대상 선정 = 23
• 3.3 해석 및 결과 = 23
• 3.3.1 Radial Bearing = 23
• 3.3.2 Axial Bearing = 23
• 3.4 FDB 동특성 계수 해석 = 24
• 3.4.1 해석 방법 = 24
• 3.4.2 해석 = 28
• 3.4.3 해석결과 = 28
• 4. 결론 = 29
• ABSTRACT = 83