Abstract
An analytical enforced angular displacement function to control angle and angular velocity of a 1DOF rotational oscillator in arbitral operating time, called rotational vibration manipulation function (RVMF), is applied to design discrete target trajectory of a swing arm in HDD for suppression residual vibration of a magnetic head at desired angles. While the enforced angular displacement is a linear combination of basis functions with parameter α_p , arm trajectory can be chosen. In this study we show some simulations with trajectories of two or non-dwell rotation. Moreover, hence RVMF is the function of current and aimed angles and angular velocities of the target oscillator, it can be modified to realize sampled-data feedback control of the oscillator. The proposed sampled-data control can be utilized to manipulate the magnetic head of HDD device under short seeking mode either for short-distance track or long-distance one for high speed and high precision positioning.
