ABSTRACT
Vibration is regarded as a branch of dynamics, since forces and masses are taken into account in vibration analysis. The magnetic recording system and Stewart platform are examples to be presented next to help in fixing the ideas more firmly. The Stewart platform is widely used as space born structures, as well as a high precision pointing device and vibration isolator. The Stewart platform has been widely used in active vibration control. The spectral density, or power spectral density is one of the most useful functions in vibration testing. To have a disk drive with a high storage capacity, the head positioning error with respect to the target track center needs to be as small as possible. The error is mainly due to, torque disturbances from spindle motor, actuator pivot friction, airflow-induced non-repeatable disk, suspension and slider vibrations, mechanical resonance vibration, and head sensing and electronic noises, media noise, and quantization noises.
