Design Of Novel Aerostatic Restrictors And Research On The Relevant Static Performance Testing Equipment

This thesis focuses on the aerostatic restrictors, one of the crucial parts ofthe aerostatic systems. Novel restricting methods were studied, the relevant staticperformance testing equipment designed and experiments carried out. Main researchcontents are as follows:Firstly, embedded with the creative compound restricting methods, threegeometries were designed and relevant national patents of invention applied. Inparticular, the mathematical model of theoretical bearing capacity of the axialaerostatic restrictor with parallel multi-microchannel, slot nozzle, and laminar flow(hereinafter referred to as MSLR) was established, the relation between air filmthickness and capacitance discussed, and the inner pressure distribution underdifferent supply gas pressure simulated.Secondly, combined with the design accuracy, the proper parts and loadingmechanism, the appropriative static performance testing equipment was developed,with which the S-type force sensor, the inductive micrometer, and capacitancemicrometer could work simultaneously. Specialized software for the experiments wasprogrammed, which could store the experimental data as well as visualize thetendency and fluctuation in real time.Thirdly, experiments were carried out under different supply gas pressure. Thestatic performances of the MSLR, the Hexagon aerostatic restrictor with double Ushaped groove (hereinafter referred to as U2R), and the Hexagon aerostatic restrictorwith tangent dicyclic groove (hereinafter referred to as∞R) were measured; therelation between the air film thickness and the capacitance of the MSLR was obtained;and the gas supply fluctuation influence on the air film thickness of the MSLR wasgained. Experiments show that the mathematical models are correct within errors, andthe MSLR has the best static performance compared to other restrictors being tested.The maximum air film bearing capacity of the MSLR was708.4N and the maximum air film stiffness was59.236N/μm, when the supply gas pressure was0.5MPa.Finally, the main error sources for the experiments were analyzed, the wholeresearch work summarized, and the next work to comsummate pointed out.