COMPARATIVE FINITE DIFFERENCE AND FINITE ELEMENT ANALYSIS OF THE DYNAMIC CHARACTERISTICS OF A LOAD-BEAM-LUMPED-MASS UNIT

摘要

The dynamics of a load-beam-iumped-mass unit (LBLMU) in a disk drive is modeled using physically motivated simplifications. Models are developed for sway, bending and torsion modes of vibration assuming mode decoupling. A finite-difference scheme (FDS) is employed to discretize the governing equations for the three modes. The models are verified by comparing the modal results of simplified models with the results of full 3D finite element models (FEMs) for beams with rectangular and U-shaped cross sections. Then, the models are used to predict the natural frequencies of a LBLMU. It is revealed that the simplified models capture well the dynamic characteristics of a LBLMU while requiring much smaller computational resources.