Air Flow Induced Vibration Of TheHead Carriage Arm In A Simulated Hard DiskDrive Using A Large Eddy Simulation
Air Flow Induced Vibration Of TheHead Carriage Arm In A Simulated Hard DiskDrive Using A Large Eddy Simulation
复制标题
使用大涡模拟模拟硬盘驱动器中的气流引起的磁头托架臂振动
DOI：
10.2495/afm080421
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
Z. Qide
中科院分区：
文献类型：
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作者：
K. Sundaravadivelu;Z. Qide
采用大涡模拟（LES）方法对模拟硬盘驱动器（HDD）中简化磁头托架臂（HCA）的气流诱导振动进行了研究。采用动态Smagorinsky-Lily亚尺度模型对3.5英寸硬盘模型中两块同向旋转磁盘间的湍流流动特性进行了数值模拟。假设HCA在两个不同位置的两个磁盘之间飞行，即，内（ID）和中间（MD）盘直径，同时盘以10000 rpm旋转。预测的气流特性被发现是在良好的协议与测量。在HCA前缘附近形成一个大的湍流涡流，这反过来又放大了作用在HCA上的非定常气动力。由此产生的气动力被用作结构分析的输入，以预测气流引起的HCA振动。当HCA位于ID处时，面内和面外振动的幅度分别为0.26nm和4.8nm。在HCA位于MD的情况下，它们分别为0.35nm和11nm。因此，推断在该模拟HDD模型研究中，面外振动比其对应的面内振动更强。这又可能影响磁头的飞行高度。数值预测与观测结果进行了验证，发现是在更好的协议。
Air-flow induced vibration of the simplified head carriage arm (HCA) in a simulated hard disk drive (HDD) is carried out using the large eddy simulation (LES). The dynamic Smagorinsky-Lily sub-scale model is employed to predict the turbulent air flow characteristics between two co-rotating magnetic disks of a simplified 3.5inch HDD model. The HCA is assumed to fly in between the two disks at two different positions viz., inner (ID) and middle (MD) disk diameters, while the disks are rotating at 10000 rpm. Predicted airflow characteristics are found to be in good agreement with the measurements. A large turbulent eddy is formed near the leading edge of the HCA, which in turn amplifies the unsteady aerodynamic forces acting on the HCA. The resulting aerodynamic forces are used as input for the structural analysis to predict the air flow induced HCA vibrations. The magnitudes of the in-plane and the out of plane vibrations when the HCA is positioned at ID are found to be 0.26nm and 4.8 nm respectively. In the case of HCA positioned at MD they are found to be 0.35nm and 11 nm respectively. Therefore it is inferred that in this simulated HDD model study the out-of-plane vibration is stronger than its corresponding in-plane vibration. This may in turn affect the flying height of the magnetic head. The numerical predictions are verified with observations and found to be in better agreement.