Modeling the Smpled-data System with a discontinuous Hold for Hard Disk Ramp Loading

This paper deals with modeling of the hard disk ramp loading with a discontinuous controller. The property of the sampled-data system with a discontinuous hold is studied. Further, explicit expression of the discrete-time transfer function of sampled-data systems with a discontinuous hold is provided for a class of continuous time plant. It is shown that with discontinuous hold, the hard disk plant sampled-time model is minimum-phase instead of non-minimum phase if with zero-order hold