# Research Developments of Aerostatic Thrust Bearings: A Review
## 4 Advances in Dynamic Performance
### Parametric Research and Optimization
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Year** & **Focus** & **Evaluation** & **Methodology** & **Bearing Type** & **Restrictor** & **Major Conclusions** \\
**Author** & **Parameters** & **Index** & **Methods** & **Type** & **Type** & **Major Conclusions** \\ \hline
2012 & \begin{tabular}{c} Office diameter, \\ gap height, \\ supply pressure, \\ perturbation \\ amount, L/B \\ ratio \\ \end{tabular} & Dynamic stiffness & Experiments and damping, & \begin{tabular}{c} \\ and damping, \\ load capacity \\ \end{tabular} & \begin{tabular}{c} Experiments and \\ FEM model \\ \end{tabular} & \begin{tabular}{c} Rectangular \\ thrust bearing \\ \end{tabular} & \
\begin{tabular}{c} Annual \\ orifices \\ \end{tabular} &
\begin{tabular}{c} Provided guidelines to \\ manufacture more \\ stable inherently \\ compensated air \\ bearings, a novel \\ bearing manufacturing \\ technology \\ \end{tabular} \\ \hline
2012 & \begin{tabular}{c} Air film thickness, \\ the inclination \\ angle of the sheet \\ \end{tabular} & \begin{tabular}{c} Deformation \\ behavior and the \\ orbit of the \\ flying height \\ \end{tabular} & \begin{tabular}{c} Experiments and \\ numerical model \\ \end{tabular} & \begin{tabular}{c} Aerostatic \\ guideways \\ \end{tabular} & \
\begin{tabular}{c} Porous \\ restricttor \\ \end{tabular} &
\begin{tabular}{c} Investigated the \\ deformation behavior \\ and the orbit of the \\ flying height \\ \end{tabular} \\ \hline
2014 & / & Stability criteria & \begin{tabular}{c} Experiments and \\ numerical model \\ \end{tabular} & \begin{tabular}{c} Circular thrust \\ bearing \\ \end{tabular} & \
\begin{tabular}{c} Office \\ restriction \\ \end{tabular} &
\begin{tabular}{c} Analyzed the \\ generation mechanism \\ and stability \\ discriminant of air \\ hammer, and proposed \\ preventive methods \\ \end{tabular} \\ \hline
2014 & \begin{tabular}{c} Type of pressure- \\ equalizing \\ groove \\ \end{tabular} & \begin{tabular}{c} Bearing capacity \\ and static \\ stiffness \\ \end{tabular} & CFD simulation & \begin{tabular}{c} Annular \\ bearing \\ \end{tabular} & \
\begin{tabular}{c} Annular \\ orifices \\ \end{tabular} &
\begin{tabular}{c} The airflow field \\ resistance was reduced \\ \end{tabular} \\ \hline
2014 & \begin{tabular}{c} Gas fluctuation \\ [PERSON] [6] \\ \end{tabular} & \begin{tabular}{c} Pressure \\ configurations \\ \end{tabular} & \begin{tabular}{c} Experiments and \\ FEM model \\ \end{tabular} & \begin{tabular}{c} Rectangular \\ thrust bearing \\ \end{tabular} & \
\begin{tabular}{c} Office \\ Restrictor \\ \end{tabular} &
\begin{tabular}{c} Diagnosed the basic \\ frequency of the \\ guideway system \\ according to the \\ vibration signals \\ \end{tabular} \\ \hline
2015 & \begin{tabular}{c} Office chamber \\ configurations \\ \end{tabular} & \begin{tabular}{c} Pressure \\ distributions, gas \\ vortices, and the \\ turbulent \\ intensity \\ \end{tabular} & \begin{tabular}{c} Experiments and \\ CFD simulation \\ \end{tabular} & \begin{tabular}{c} Annular \\ bearing \\ \end{tabular} & \
\begin{tabular}{c} Office \\ Restrictor \\ \end{tabular} &
\begin{tabular}{c} Influences of six orifice \\ chamber shapes on \\ performance \\ characteristics of ATBs \\ \end{tabular} \\ \hline
2017 & \begin{tabular}{c} Air film thickness \\ Colombo, F. [78] \\ \end{tabular} & \begin{tabular}{c} Dynamic stiffness \\ \end{tabular} & \begin{tabular}{c} Lumped \\ parameters model \\ \end{tabular} & \begin{tabular}{c} Rectangular \\ thrust bearing \\ \end{tabular} & \
\begin{tabular}{c} Annular \\ orifices \\ \end{tabular} &
\begin{tabular}{c} Develed and \\ validated a lumped \\ parameters model to \\ simulate the bearing in \\ dynamic conditions \\ \end{tabular} \\ \hline
2017 & \begin{tabular}{c} Film thickness, \\ supply holes, \\ frequency \\ \end{tabular} & \begin{tabular}{c} Pressure \\ distributions, \\ equivalent \\ acceleration \\ \end{tabular} & CFD simulation & Circular pad & \
\begin{tabular}{c} Annular \\ orifices \\ \end{tabular} &
\begin{tabular}{c} Numerically revealed \\ the mechanism of \\ vortex forming, and \\ verified the rationality \\ of using the maximum \\ Mach number to \\ represent the \\ dynamic stability \\ \end{tabular} \\ \hline
2018 & \begin{tabular}{c} Pressure \\ fluctuation \\ \end{tabular} & Vibration signals & Experiments & \begin{tabular}{c} Aerostatic \\ slider \\ \end{tabular} & \
\begin{tabular}{c} Office \\ Restrictor \\ \end{tabular} &
\begin{tabular}{c} Provided a basis for the \\ identification of slider \\ errors \\ \end{tabular} \\ \hline
2018 & \begin{tabular}{c} Office position \\ and the supply \\ pressure \\ \end{tabular} & \begin{tabular}{c} Dynamic stiffness \\ and damping \\ \end{tabular} & \begin{tabular}{c} Experiments and \\ numerical model \\ \end{tabular} & \begin{tabular}{c} Rectangular \\ pad \\ \end{tabular} & \
\begin{tabular}{c} Annular \\ orifices \\ \end{tabular} &
\begin{tabular}{c} Envemematically \\ numerical model, \\ investigated the \\ performance of \\ rectangular \\ aerostatic pads \\ \end{tabular} \\ \hline
2019 & \begin{tabular}{c} Structure, supply \\ pressure, film \\ thickness \\ \end{tabular} & Straightness & \begin{tabular}{c} Experiments and \\ FDM model \\ \end{tabular} & \begin{tabular}{c} Aerostatic \\ slider \\ \end{tabular} & \
\begin{tabular}{c} Office \\ Restrictor \\ \end{tabular} &
\begin{tabular}{c} Orifice \\ two-, three-, and \\ four- orifice gas bearings \\ \end{tabular} \\ \hline \hline \end{tabular}
\end{table}