Coupling Effects between Airflow and Structural Vibration for Slim-Type Optical Disk Drive
|關鍵字:||薄型光碟機;耦合效應;粗糙度;Slim-Type Disk Drive;Coupling effects;Roughness|
Slim-type optical disk drives is one of indispensable data access device in laptop computers nowadays. Reducing its volume and weight is one of major objectives for the current slim-type disk drive development. With the reduction of its chest volume, disk rotation leads to airflow between the chest and disk such that the coupling between the airflow and structure may cause the disk to vibrate. With the weight decrease, high-speed disk rotation may cause the disk, the read and write pickup head, and even the whole structure to vibrate. Accordingly, it may result in poor condition of data access. This study carries out the finite element method to analyze coupling effects between flow and structure of the slim disk drive. We examine disk deformation by simulating different disk speeds and flow geometries. Moreover, we reduce the vibration of the disk by changing the flow field geometry. This study found that the coupling effects between the airflow and structure of the slim disk drive will enlarge the disk vibration amplitude from 3 to 125 . When the amplitude is within the servo control range of the slim disk drive, it is not a main factor that affects the read/write capability of the drive. However, when the amplitude exceeds the servo control range, the read/write capability degrades. Experimental results show that we can improve slim disk drive read/write performance certainly by reducing the height and enlarging the roughness of the top flow flied. Also from simulate results show that the pressure distribution of the flow varies by reducing the height and enlarging the roughness of the top flow field inside the drive. As a consequence, we decrease the disk amplitude and hence improve read/write performance of the slim disk drive.