title: Coaxial stability of nano-bearings constructed by double-walled carbon nanotubes.
abstract: How to effectively control the coaxial stability of nano-bearings has an important influence on improving the quality of nano-bearings. Some relevant problems are studied in this paper. Firstly, we investigate basic non-coaxial modes in double-wall carbon nanotubes (DWCNTs). On the basis of analysis for these non-coaxial modes, a planar continuum model is established according to the principle of homogenization. By means of this model, a dynamic parameter λ(*) characterizing the coaxial stability of nano-bearings is determined. λ(*) is the explicit function of the angular velocity and interlayer spacing of DWCNTs. In terms of λ(*), a criterion used to judge the coaxial stability of nano-bearings is given. Through discussing the influence of the angular velocity and interlayer spacing on the dynamic parameter λ(*), some important conclusions are drawn.
authors.affiliation: College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, People's Republic of China.
authors.forename: Zaixing
authors.initials: Z
authors.lastname: Huang