The purpose of this paper is to study the effect law of roundness error on the properties of gas foil conical bearing (GFCB), and the performance of bearings with different non-circular sleeve shapes are calculated.,For the bump-type GFCB, the nonlinear bump foil stiffness model and 1-D beam top foil stiffness model are built. On this basis, the finite element method and finite difference method are used to solve the Reynolds equation and the film thickness equation coupled, and the static and dynamic properties of GFCB are calculated. The effect law of sleeve roundness error on the static performance under different conditions is obtained. Moreover, the dynamic stiffness and damping characteristics under different errors are also studied.,The roundness error will decrease the load capacity and friction torque of GFCB, and increase the attitude angle. The error effect is more dramatic when there is larger eccentric, small nominal clearance, larger error value and more error lobes, and the static performance exhibits a periodic change in the circumferential direction. The roundness error can also decrease the direct stiffness and cross-coupled damping of GFCB, while the cross-coupled stiffness increases largely, which will reduce the bearing stability.,The roundness error adversely affects the static and dynamic characteristics of GFCB, which should be concerned by bearing designers, researchers and academicians.,The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-01-2020-0019/

中文翻译：

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圆度误差对新型气箔圆锥轴承性能的影响

本文的目的是研究圆度误差对气箔圆锥轴承（GFCB）性能的影响规律，并计算不同非圆形套筒形状的轴承的性能。,对于凸块型GFCB，建立了非线性凹凸箔刚度模型和一维梁顶箔刚度模型。在此基础上，采用有限元法和有限差分法求解雷诺方程和耦合的膜厚方程，计算GFCB的静态和动态性能。得到了不同工况下套筒圆度误差对静态性能的影响规律。此外，还研究了不同误差下的动态刚度和阻尼特性。圆度误差会降低GFCB的承载能力和摩擦力矩，并增加姿态角。偏心越大、公称游隙越小、误差值越大、误差瓣越多，误差效应越显着，静态性能在圆周方向上呈现周期性变化。圆度误差还会降低GFCB的直接刚度和交叉耦合阻尼，而交叉耦合刚度大幅增加，会降低轴承稳定性。,圆度误差对GFCB的静动态特性产生不利影响，应受到轴承设计者、研究人员和院士的关注。本文的同行评审历史可在：https://publons.com/publon/10.1108/ILT-01-2020-0019/ 静态性能在圆周方向呈现周期性变化。圆度误差还会降低GFCB的直接刚度和交叉耦合阻尼，而交叉耦合刚度大幅增加，会降低轴承稳定性。,圆度误差对GFCB的静动态特性产生不利影响，应轴承设计者、研究人员和院士的关注。本文的同行评审历史可在：https://publons.com/publon/10.1108/ILT-01-2020-0019/ 静态性能在圆周方向呈现周期性变化。圆度误差还会降低GFCB的直接刚度和交叉耦合阻尼，而交叉耦合刚度大幅增加，会降低轴承稳定性。,圆度误差对GFCB的静动态特性产生不利影响，应受到轴承设计者、研究人员和院士的关注。本文的同行评审历史可在：https://publons.com/publon/10.1108/ILT-01-2020-0019/