欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
针对200MW汽轮发电机组轴系，建立了椭圆轴承-转子系统的动力学模型和椭圆轴承油膜力非线性模型．利用固定界面模态综合法将608个自由度的非线性动力学系统降至30个自由度，然后采用Rouge-Kutta法对降维后的模型进行数值求解，得到随转速变化的频响陷线、分岔图和三维谱图，并据此分析系统的稳定性．利用转速变化的频响曲线，分析了偏心距、润滑剂黏度系数和轴承长径比等参数对系统动力特性的影响．数值结果表明：椭圆轴承-转子系统的稳定性区域要大于圆轴承-转子系统的稳定性区域．
英文摘要：
The nonlinear dynamic behavior of elliptic bearing-rotor system was investigated by working on 200 MW steam turbine as an example. The finite element method was employed to establish a dynamical model of the system and a nonlinear model derived from the variational principle was adopted to describe the oil force of elliptic bearings. Then, the nonlinear dynamic system with 608-degree-of-freedom was reduced to a 30-degree-of-freeodm model in terms of the fixed interface mode synthesis method. The Rouge-Kutta method was employed to solve the reduced model numerically, and the frequency-response curve, the bifurcation diagram, and the three dimensional spectral plot obtained were used to analyze the stability of the rotor-bearing system. The effects, on the dynamic behavior of the system, of the eccentricity, the oil viscosity and the length-to-diameter ratio of bearing were discussed in terms of the frequency-response curve. The numerical results show that the stability range of the elliptic bearing-rotor model is larger than that of the circular bearing-rotor system.
位置：
同期刊论文项目
