Abstract: The analysis of the dynamics of precision centrifuge principal axis system with the externally pressurized gas bearing is an important issues in securing the precision of accelerometer. A term has been suggested to add to conventional Reynolds equation of orifice compensate externally pressurized gas bearing simplify the calculation. Through the method of the two step partially differentiate equation discretization, namely the optimization of variation functionals and proceed the numerical value resolution of carrying capacity and rigidity with finite element method. A direct resolution is adopted by merging partial differential equations (the equations of Reynolds) de-scribing the externally pressurized gas bearing performance with dynamics mathematical model of externally pressurized gas bearing spindle system, which enormously improves calcu-lation precision and reliability.

Key words: Dynamics, Externally pressurized gas bearing, Precision centrifuge, Spindle, electro-thermal damage, carbon fiber/epoxy composite, glass transition temperature, hydrothermal aging, infrared spectrum