Simulation Analsys On Air Bearing Surface With Anti-shock Function In Hard Disk Drive Applications

As the fly height (FH) continue to reduce and stronger disturbances duringoperating state are encountered, especially with the emergence of small form factordrives for consumer electronics. It is necessary to take measures to prevent theunexpected thing happened during shock event. Normal drives can not properly functionin such kinds of environments. The main effects of shock are malfunctions during HDDoperating state, losses of important information due to the HDD damage.This thesis focuses on the optimization of ABS design to enhance its mechanicalrobustness and raise its damping ratio, so that improve the anti-shock performance andoperational reliability, prolong the useful life of HDD. First, provides an introduction tohistorical development of HDD, reviews previous work on slider ABS optimization.Second, briefly introduces the structural components of HDD relating slider dynamicfeatures. Third, gives an introduction of a general purpose numerical simulation program,named CML Air Bearing Dynamic Simulator, for studying the dynamics of thehead-disk-suspension assembly of HDD, including deduction of rarefied gas lubricationequation from generalized Reynolds Equation. Fourth, illustrates the shock simulationresults with the shock simulator which is developed based on software CML Air. Finally,gives three ABSs with quite different stiffness and damping, and compares the shockperformance with each other.