Investigation of Near-Field Optical Disks and Air Bearing in Rarefied Gas Flow

• Main Authors: Yuan-Chang Kuo, 郭原彰
• Other Authors: Tzong-Shi Liu
• Format: Others
• Language: en_US
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/57045250300769921788

碩士 === 國立交通大學 === 機械工程系所 === 92 === The lattice Boltzmann method (LBM) is an efficient algorithm for simulating single-phase and multiphase fluid flows and for combining physical complexities. The LBM is especially useful for modeling complicated boundary conditions and multiphase interfaces. Disk rotation causes disk deformation and even wave propagation. The disk equation of motion is expressed by partial differential equations. This study employs a FEMLAB software, based on the finite element method, to solves partial differential equations. A near-field optical disk drive uses near-field optics to read/write disk data with a flying height at about 50nm. However, the flying height is affected by pickup head vibration, disk vibration, and airflow between the flying head and disk. This study adopts LBM to compute pressure distribution for the air bearing between the pickup head and disk. Moreover, this study employs FEMLAB to solve disk equations of motion and obtain disk deformation subject to a point force that accounts for the air bearing force. Computational results are compared with the literature to validate the model.