Abstract
With areal recording density of hard disk drives(HDD) historically growing at an average of 60-l00 % annually, it is becoming increasingly more difficult to maintain the precise positioning required of the ever-smaller GMR heads to read and write data. Any unexpeced vibration will cause the data writte to a wrong data track Consequently, the dynamic behaviors of HDD spindle systems and their potential influences on track misregistration are always key issues in disk drive design. This paper studies dynamic performance of HDD spindle systems using a computer simulation approach, which uses the combined multi-body system technology and finite element based component mode synthesis method. The elastic component natural frequencies and modal shape vectors are obtained using a finite element analysis. Their modal shape vectors are then incorporated into the goveming equations of motion for HDD spindle systems. An implicit numerical integration method is used to solve the dynamic equations. Two typical HDD spindle systems were investigated numerically and verified experimentally.
