Abstract: Dynamic performance of hydrostatic rotary table has a greater impact on its comprehensive properties, so in-depth study on the dynamic performance of hydrostatic rotary table has an important role for its optimal design and enhances its overall performance. The nonlinear load –carrying capacity of supporting and preloaded pads which consider surface roughness is calculated according to Christensen’s model. A new multi-dimensional dynamic model for quantitative type hydrostatic rotary table is established. The dynamic equation is solved by Runge-Kutta method to get the dynamic responses, stability time and stability film thickness. The influence of various design parameters are analyzed like: surface roughness, initial film thickness, flow rate of the constant pump and so on. This research shows that the unbalance loading degrade the dynamic performance of hydrostatic rotary table. Thinner oil film and bigger flow rate is good for improving performance of hydrostatic rotary table. Surface roughness may considerably influence the operating characteristics of this rotary table and that the direction of the influence depends upon the type of roughness assumed. Dynamic modeling and analysis conclusions presented will provide a theoretical basis for the optimal design and enhance the comprehensive properties of hydrostatic rotary table.

Key words: dynamic analysis, hydrostatic rotary table, Reynolds equation, surface roughness