摘要
以球面螺旋槽动静压气体轴承为研究对象,建立以轴心瞬时位置和瞬时变位速度为参数,球面螺旋槽动静压气体轴承的非线性动态润滑分析计算数学模型.采用导数积分法和有限差分法相结合,数值计算出三维气膜的瞬态扰动压力分布、气膜刚度和阻尼系数.研究转速、偏心率及供气压力对气膜动态特性系数的影响规律.研究结果表明:随着供气压力、转速以及偏心率的增大,气膜刚度和阻尼系数均有不同程度的变化.建立球面螺旋槽动静压气体轴承转子系统稳定性预测模型,根据劳斯稳定性判据预测轴承的稳定性,并将稳定性与主动控制轴承运行时的刚度和阻尼相关联,为遏制轴承失稳提供理论基础.
In order to research the spherical spiral groove hybrid gas bearings,the nonlinear dynamic lubrication analysis mathematical model of spherical spiral groove hybrid gas bearings was established,based on the parameters of axis instantaneous position and instantaneous displacement speed.The transient perturbation pressure distribution of three-dimensional gas film,stiffness and damping coefficients were numerically computed were solved by using the combination of derivative integration and finite difference method.The influence law of speed,eccentricity ratio and supply pressure on the dynamic characteristics of gas film was researched.The results show that the influence of bearing＆#39;s supply pressure,speed and eccentricity ratio on the stiffness and damping coefficient of gas film was significant.The prediction model to estimate stability of rotor-bearing system was established,helping to predict the stability of bearings by applying Routh-Hurwitz stability criterion.The research provides the theoretical foundation for controlling actively the bearing running stiffness and damping and stemming the instability of gas film.
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2017年第6期1400-1411,共12页
Journal of Aerospace Power
基金
国家自然科学基金(51475142)
河南省教育厅科技攻关项目(13A460251)
河南省高校科技创新团队支持计划(13IRTSTHN025)
关键词
稳定性
动态特性系数
雷诺方程
有限差分法
球面气体轴承
stability
dynamic characteristic coefficients
Reynolds equation
finite difference method
spherical gas bearings
