Research on Support Structure Design of High Precision Inertial Product Measurement

In order to avoid the influence of interfering torques in high-precision product of inertial (POI) measurement for inertial sensor assembly, a combined air bearing with radial and axial air bearing was designed as non-contact support structure. The theoretical model was established and the CFD simulation was carried out so as to study the support structure’s bearing capacity. Meanwhile, a test device was designed and built to verify the simulation accuracy. Research showed the simulation results were close to the experiment results, and thrust bearing capacity of non-contact support structure was the weakness of POI measurement. So a study of thrust bearing capacity improvement was carried out based on parametric modeling. The results show that increasing the rotor sleeve diameter in the supporting structure helps to improve thrust bearing capacity. After improvement, the thrust bearing capacity can increase by 182.98%, the upper limit of rotational speed can increase by 54.10%, and the measuring accuracy of POI measurement can increase by 42.11%.