With Liouville-Green transform, the asymptotic method to solve second homogeneous linearity equation was improved.
结合Liouville-Green变换,改进了求解变系数二阶线性齐次方程的渐近法。
Reagarding the inertia force of rotor as the force acting on the shaft, the effect of thermal expansion upon the natural transversal vibration frequencies of rotor system is studied by a new nonlinear asymptotic method.
把转子的惯性力看成作用在轴上的外力,采用新的非线性渐近法研究热膨胀对转子系统固有横振频率的影响。