润滑与密封
潤滑與密封
윤활여밀봉
LUBRICATION ENGINEERING
2015年
1期
9-15
,共7页
气体润滑%稀薄流域%稀薄效应%磁头磁盘系统
氣體潤滑%稀薄流域%稀薄效應%磁頭磁盤繫統
기체윤활%희박류역%희박효응%자두자반계통
gas lubrication%rarefied region%rarefied effect%head-disk system
磁头与磁盘的特征高度目前已经下降到纳米量级，在此微小间隙下，气体表现出明显的稀薄效应特征。建立适用于纳米间隙下的控制方程，并根据方程特点采用特殊处理方法成功对控制方程进行数值求解，采用数值分析和实验方法分析表面结构变化对稀薄流域和磁头飞行姿态的影响。研究结果表明：在纳米级气膜润滑间隙下，采用逆 Knud-sen 数来划分稀薄流域比仅从特征膜厚高度方面考虑更合理；负压型磁头的主要工作区间在滑流区和过渡区，且过渡流域所占比例要明显高于滑流区域。稀薄效应最大的区域不是在气膜厚度最薄的磁头尾部，而是在压力突然下降且气膜较薄的阶梯过渡区域；磁头 U 型气垫、尾端两侧浅台阶和中间台阶结构变化会影响气流流向，从而影响压力分布，使得稀薄流域也跟随发生变化。
磁頭與磁盤的特徵高度目前已經下降到納米量級，在此微小間隙下，氣體錶現齣明顯的稀薄效應特徵。建立適用于納米間隙下的控製方程，併根據方程特點採用特殊處理方法成功對控製方程進行數值求解，採用數值分析和實驗方法分析錶麵結構變化對稀薄流域和磁頭飛行姿態的影響。研究結果錶明：在納米級氣膜潤滑間隙下，採用逆 Knud-sen 數來劃分稀薄流域比僅從特徵膜厚高度方麵攷慮更閤理；負壓型磁頭的主要工作區間在滑流區和過渡區，且過渡流域所佔比例要明顯高于滑流區域。稀薄效應最大的區域不是在氣膜厚度最薄的磁頭尾部，而是在壓力突然下降且氣膜較薄的階梯過渡區域；磁頭 U 型氣墊、尾耑兩側淺檯階和中間檯階結構變化會影響氣流流嚮，從而影響壓力分佈，使得稀薄流域也跟隨髮生變化。
자두여자반적특정고도목전이경하강도납미량급，재차미소간극하，기체표현출명현적희박효응특정。건립괄용우납미간극하적공제방정，병근거방정특점채용특수처리방법성공대공제방정진행수치구해，채용수치분석화실험방법분석표면결구변화대희박류역화자두비행자태적영향。연구결과표명：재납미급기막윤활간극하，채용역 Knud-sen 수래화분희박류역비부종특정막후고도방면고필경합리；부압형자두적주요공작구간재활류구화과도구，차과도류역소점비례요명현고우활류구역。희박효응최대적구역불시재기막후도최박적자두미부，이시재압력돌연하강차기막교박적계제과도구역；자두 U 형기점、미단량측천태계화중간태계결구변화회영향기류류향，종이영향압력분포，사득희박류역야근수발생변화。
The characteristic height of the magnetic head has down to the nanoscale,and the gas shows obviously rare-fied effect characteristics at this micro gaps.The control equation introducing the rarefied effect was established and solved successfully using numerical method based on special treatment scheme.The effect of the surface structure on the gas film rarefied region and flying attitude was analyzed by numerical analysis and experimental tests.The results show that:the gas flow regime divided depending on the inverse Knudsen number is more reasonable than that only from the view of film thickness;negative slider mainly works in the slip-flow and transition regions and the area proportion of transition regions is significantly higher than that of the slip regions;the maximum rarefied effect occurs at the side edges where the flying height is thinner and the pressure is lower but not in the minimum flying height on the rear;the variations of the U-shaped slider,both trailing sides slider and the trailing intermediate slider of the magnetic head makes the air flow changes,which directly affects the pressure distribution and rarefied regions of the gas film.
