三油楔轴承结构参数对转子系统临界转速的影响

Influences of Structure Parameters of Three-lobe Bearing on Critical Speed of Bearing-Rotor System

以三油楔固定瓦滑动轴承(不同心)-弹性Jeffcott转子系统为研究对象。在计及滑动轴承各向异性特点的基础上,通过编程计算,求解了滑动轴承的刚度系数和轴承-转子系统的水平临界转速和垂直临界转速。获得了轴承结构参数——宽径比、最小间隙比和预载荷系数对系统临界转速的影响规律。结果表明:改变轴承结构参数对系统临界转速产生影响,尤其对水平临界转速影响较大;增大宽径比、减小最小间隙比和预载荷系数可以增大系统的水平临界转速;增大宽径比和最小间隙比,垂直临界转速先减小后增大;增大预载荷系数,垂直临界转速增大。

Taking three - fixing - lobe bearings which are not concentric supporting elastic Jeffcott rotor as the research subject, based on considering the anisotropy characteristic of journal bearing, stiffness coefficients of journal bearing and horizontal （vertical） critical speed were solved by programming and calculating. The influences of bearing parameters, such as length -to -diameter ratio,minimum clearance ratio and preload coaffilcient on the critical speeds of the system were obtained. The results show that the critical speeds of the system are influenced by changing the structure parameters of journal bearing, especially about horizontal critical speed; increasing length- to -diameter ratio and decreasing minimum clearance ratio and preload coefficient, horizontal critical speed is increased; increasing length - to - diameter ratio and minimum clearance ratio, vertical critical speed is first decreased and then increased; increasing preload coefficient, vertical critical speed is increased.