Abstract
A support system is the main load-bearing com-ponent of sample table for neutron stress spectrometer and air bearing is an important element of support system. The neutron stress spectrometer sample table was intro-duced, and the scheme for air bearing combination was selected. To study the performance of air bearing eccentric cross gap, finite element models (FEMs) were established based on air motion and Reynolds equations, effects of types of cross gap, air supply pressure and gap parameters on the overturning moment and bearing capacity of air bearing eccentric cross gap were analyzed. Results indicate that the overturning moment of air bearing with eccentric cross gap is large, and the overturning moment of air bearing cross two holes is larger than cross one hole. The width, depth, and height differences of the marble floor gap played important roles in the performance of the air bearing. When gap width is lesser than 1 mm and gap depth is lower than 0.4 mm, bearing capacity and over-turning moment would vary rapidly with the variation of the width and depth. A gap height difference results in the bearing capacity dropping rapidly. The FEM results agree well with experimental results. Further, fingdings of the study could guide the design of the support system and marble floor.DOI: http://dx.doi.org/10.5755/j01.mech.23.2.14019
Highlights
Neutron diffraction is the only direct test method for measuring the stress field in the deep place of the component
The effects of different air supply pressure, gap width, gap depth, and gap height difference on static performance of the bearing are studied according to the two typical models
The simulation results show that bearing capacity and overturning moment of the air bearing are greatly changed under the eccentric cross gap
Summary
Neutron diffraction is the only direct test method for measuring the stress field in the deep place of the component. Poor bearing capacity of common air static pressure bearing and cross-gap performance will limit the application of air bearing in large load bearing, high precision, and so on. Improving the rigidity of air bearing and its cross-gap performance could achieve stable motion and high precision measurement of the neutron stress spectrometer. Chen and Lin [1] adopted resistance network equivalent and other effective methods to analyze the dynamic and static characteristics of rectangular air bearing with X groove, which indicated large bearing capacity and rigidity of air bearing. Belforte et al [4] designed experiments to analyze the air bearing of the center of the annular air hole and the pressure distribution of chamber to derive the calculation formula of the inlet flow rate and throttling coefficient of the air. Research on the air static pressure bearing of the eccentric cross-gap performance is less, and the research of the performance of eccentric cross gap has important engineering application value
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