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拉杆转子由于加工和装配工艺误差会引入几何与接触非线性特征,针对非线性模型描述不全面、不精确的问题,结合转子动力学方法和有限元方法,首先建立转子动态平衡方程,将包含有多种接触变形因素的刚度项以未知函数来表示;提出参数化建模的方法,对转子细观结构进行参数化表达,以螺栓预紧不均匀和轮盘质量偏心夹角作为非线性接入因子和刚度函数的自变量,建立参数空间;通过有限元方法对参数空间下的转子模型进行仿真分析,建立起从细观结构特征到宏观非线性刚度特性的映射关系,得到了稳定工作状态下,拉杆转子在参数空间上的宏观位移特性以及宏观非线性刚度特性,拟合出刚度函数,建立了既体现细观结构影响,又可用于动态分析的宏观非线性动力学模型。
Due to the machining and assembly process error, the rod-rod rotor will introduce the geometric and contact non-linear characteristics. In view of the incomplete and inaccurate description of the nonlinear model, the rotor dynamic equation and the finite element method are first established. The stiffness terms of various contact deformation factors are expressed by unknown functions. A parametric modeling method is proposed to parametrize the rotor meso-structure. Taking the non-uniform bolt pre-tightening and eccentric eccentricity of the roulette as nonlinear access Factor and stiffness function, and establish the parameter space. The finite element method is used to simulate the rotor model in the parameter space, and the mapping relationship from the meso-structure characteristics to the macro-nonlinear stiffness characteristics is established. Under stable working condition , The macro-displacement characteristics of rod-rotor in parameter space and the macroscopic non-linear stiffness characteristics, the stiffness function is fitted and a macroscopic nonlinear dynamic model is established, which can not only reflect the influence of meso-structure but also dynamic analysis.