Computing the aeroelastic disk vibrations in a hard disk drive |
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| Affiliation: | 1. Hitachi Global Storage Technologies, 5600 Cottle Road, San Jose, CA 95193, USA;2. Computer Mechanics Laboratory, Department of Mechanical Engineering, University of California at Berkeley, Berkeley, CA 94720, USA;1. School of Mechanical Engineering, Xi''an Jiaotong University, Xi''an 710049, PR China;2. State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi''an Jiaotong University, Xi''an 710049, PR China;1. Brunel Innovation Centre, Brunel University, Uxbridge, Middlesex UB8 3PH, UK;2. School of Engineering and Design, Brunel University,Uxbridge, Middlesex UB8 3PH, UK;1. Laboratoire dʼingénierie et matériaux, LIMAT, faculté des sciences Ben MʼSik, université Hassan II Mohammedia Casablanca, Sidi Othman, Casablanca, Morocco;2. Laboratoire dʼétudes des microstructures et de mécanique des matériaux, LEM3, UMR CNRS 7239, université de Lorraine, île du Saulcy, 57045 Metz cedex 01, France;3. Laboratory of Excellence on Design of Alloy Metals for Low-Mass Structures (DAMAS), université de Lorraine, France;4. School of Civil Engineering, Wuhan University, 8 South Road of East Lake, 430072 Wuhan, PR China |
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| Abstract: | The turbulent flow of air caused by the spinning of a single disk inside a typical hard disk drive casing is calculated using large eddy simulation (LES). The pressure acting on the disk is recorded as a function of time and is used to compute the vibrations of the spinning disk using a self-developed hybrid-spectral finite-difference code. This unidirectional fluid–structure interaction problem is computed for two commonly occurring cases: a disk actuated on one side only (Case 1) and a disk actuated on both sides (Case 2). The pressure loading on the disk is characterized in terms of its mean, root-mean-square (r.m.s.) and its spectral content. The mean pressure acting on the disk is asymmetrical in the case where the disk is actuated on one side only, leading to a mean deformation of the disk to one side. The r.m.s. vibrations of Case 2 are higher than those for Case 1 and their spectral distributions are almost identical. Large pressure fluctuations of the flow are found in the wake of the actuator arm and near the region where the shroud expands to accomodate the actuator. The spectral content of the excitation force due to the pressure is mainly in the low kHz frequency range, while higher frequencies are seen at the disk edge. This typically results in the excitation of the first 3–4 modes of the disk; however, (asymmetric) Case 1 displays the excitation of higher modes compared with (symmetric) Case 2. |
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