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Molecular dynamics simulation on radial gas film stiffness ofaerostatic spindle system for ultra-precision machine tool(PDF)


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Molecular dynamics simulation on radial gas film stiffness ofaerostatic spindle system for ultra-precision machine tool
Shao Chuandong1Ding Jianguo1Ni Haohao1Yang Hong2Ding Ying2
1.School of Science,Nanjing University of Science and Technology,Nanjing 210094,China; 2.Institute of Mechanical Manufacturing Technology,China Academy of Engineering Physics,Mianyang 621900,China
molecular dynamics ultra-precision machine tools radial gas film stiffness aerostatic spindle system
In view of the large-span scale problem of the computing model when dynamic analysis for the aerostatic spindle system of an ultra-precision machine tool is conducted by the computational fluid dynamics(CFD),based on the molecular dynamics simulation and similarity theory,the molecular dynamics microscopic model of the aerostatic spindle system for the ultra-precision machine is established by using an open source software LAMMPS and the Reynolds similarity criterion,and it is validated by the example of the reference. The results show that the radial gas film stiffness for the aerostatic spindle system decreases nonlinearly with the increase of the gas film thickness,increases nonlinearly with the increase of the spindle speed,and increases nonlinearly with increase of the inlet pressure in the certain range.


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Last Update: 2018-04-30