Vision-Assisted Vibration Analysis of Inhomogeneous Flexible Cables in Hard Disk Drives

• Published in: IEEE transactions on magnetics Vol. 49; no. 6; pp. 2628 - 2633
• Main Authors: Chen, Ching-Chen, Chang, Jen-Yuan
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.06.2013; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Analytical models; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Finite element analysis; Flexible cable; inhomogeneous; large deformation; Magnetism; Materials science; Mathematical model; Nonhomogeneous media; Other topics in materials science; Physics; Power cables; Shape; Vibration; vibration reduction; Vibrations; Vibrations; Hard discs; Disc drives; vibration reduction; Deformation; inhomogeneous; large deformation; Magnetic properties; Flexible cable
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2013.2252159

Reduction of flexible cable vibrations has been one of the key engineering focuses for magnetic disk drives to meet subnanometer recording precision requirement. Common approach to reduce the vibrations is to adopt additional polyimide-like damping layer on underlying homogeneous flexible cable, adding in homogeneity long the cable's dynamic loop. This paper investigates the effect of inhomogeneous composition along the cable's dynamic loop on the cable's vibration modes. The cable's profiles are obtained by experimental image processing and used in the proposed finite element model. It is found that placement and design of the inhomogeneous composition such as the damping layer for passive vibration control or piezoelectric layer for active vibration control can significantly alter the cable's modal responses, which potentially can be used to reduce transmission of the cable's vibrations onto the rotary actuator.