Linear Stability Analysis of ultra-thin Gas Lubricated Magnetic Head Slider with Roughness Effect

• Main Authors: Jang-I Lue, 呂建億
• Other Authors: Cheng-I Weng
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/27649531442169237068

碩士 === 國立成功大學 === 機械工程研究所 === 84 === Due to increasing requirement of high recording density it is necessary to maintain a thin spacing of less than 0.05m. For such low spacing, the considerations of rarefied effect and roughness effect become more important. The main purpose of this study is to analyze the dynamic stability oof magnetic head under the action of air-lubricated force between the head and disk. Further , the stability criteria would provide the design of magnetic recording system for better performance. In this study, upon the perturbation of steady state solution , the gererailzed Reynolds equation is linearized due to small variation of film thickness in the frequency domain. The air film is modelled as dynanic coefficients. Then, neutral frequency is obtained from the equation of motion of the slider. For the state problem, this study predicts the static solution for gas- lubricated slider bearings by using optimization technique. Under the requirement of ultra-low flying height and hgher reliability of magnetic recording system, the consideration of roughness effect becomes more importation so that can't omitt arbitrarily. The steady solution shows that the longitudinal roughness possesses a large load capacity than transverse isotropic and smooth case. From the effects of the surface roughness orientation on the critical bearing number、slider mass and moment of inertia, we can see that the transverse roughness is more stable than the others. The results can be included as an aid for design.