Air bearing center cross gap of neutron stress spectrometer sample table support system

doi:10.1007/s11465-016-0405-y

Front. Mech. Eng.

2016, Vol. 11

Issue (4) : 403-411 https://doi.org/10.1007/s11465-016-0405-y

RESEARCH ARTICLE

Air bearing center cross gap of neutron stress spectrometer sample table support system

Yang LI,Yunxin WU(

),Hai GONG,Xiaolei FENG

State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, China; College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China; Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation Center, Central South University, Changsha 410083, China

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Abstract

A support system is the main load-bearing component of sample table for neutron stress spectrometer, and air bearing is an important element of a support system. The neutron stress spectrometer sample table was introduced, and the scheme for air bearing combination was selected. To study the performance of air bearing center cross gap, finite element models (FEMs) were established based on air motion and Reynolds equations, effects of air supply pressure, and gap parameters on the overturning moment and bearing capacity of air bearing center cross gap were analyzed. Results indicate that 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 overturning 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, findings of the study could guide the design of the support system and marble floor.

Keywords neutron stress spectrometer sample table support system air bearing center cross gap simulation experiment

Corresponding Author(s): Yunxin WU

Just Accepted Date: 07 November 2016 Online First Date: 21 November 2016 Issue Date: 29 November 2016

Cite this article:

Yang LI,Yunxin WU,Hai GONG, et al. Air bearing center cross gap of neutron stress spectrometer sample table support system[J]. Front. Mech. Eng., 2016, 11(4): 403-411.

URL:

https://academic.hep.com.cn/fme/EN/10.1007/s11465-016-0405-y
https://academic.hep.com.cn/fme/EN/Y2016/V11/I4/403

Tab.1 Main technical parameters of sample table

Fig.1 Air bearing combination scheme: (a) Schematic drawing of installation of air bearing system; (b) structural drawing of air bearing; (c) dimensional drawing of air bearing

Fig.2 3D models of sample table: (a) Structural drawing; (b) dimensional drawing

Fig.3 Schematic models of cross gap of air bearing: (a) Center cross gap; (b) eccentric cross gap with two holes; (c) eccentric cross gap with one hole

Tab.2 Basic parameters of the simulation model of cross gap of air bearing

Fig.4 Pressure profile of air bearing: (a) Non-cross gap; (b) center cross gap

Tab.3 Bearing properties

Fig.5 Effect of gap width on bearing capacity and air consumption: (a) Varying curve of bearing capacity; (b) varying curve of air consumption

Fig.6 Effect of gap depth on bearing capacity and air consumption: (a) Varying curve of bearing capacity; (b) varying curve of air consumption

Fig.7 Effect of gap height difference on bearing capacity and overturning moment: (a) Varying curve of bearing capacity; (b) varying curve of overturning moment

Fig.8 Air bearing: (a) Dimensional drawing; (b) product picture

Fig.9 Experiment process: (a) Experiment equipment; (b) pressing of supporting block; (c) adjustment of gap width

Tab.4 Bearing capacity varies with gap width and air film thickness

Fig.10 Curve graph of bearing capacity: (a) Varies with the air film thickness; (b) varies with the gap width

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