Abstract
The aim of this research is to study the application of electrorheological fluid damper in reducing vibration of an optical-disk drive. Electrorheological fluid is an intelligent material that can change stiffness and damping by varying the electric field. Therefore, this property is employed to design an active damper to be applied to an optical-disk drive. In this thesis, the viscoelastic theory is utilized to explain dynamic behavior of rubber and electrorheological fluid. In addition, the storage modulus and loss modulus are measured by dynamic experiment and are employed to the analysis of vibrational behavior for an optical-disk drive. Moreover, the residual vibration that is generated by the unbalanced mass during high-speed rotation of the optical-disk drive supported with electrorheological fluid damper is measured. Comparing the experimental results to the theoretical ones, some phenomena are observed and disscussed.