循环载荷冲击下滚滑轴承的振动特性

Vibration Characteristics of Rolling-sliding Blend Bearing under the Impact of Cyclic Loading

在深入研究其结构和工作机理的基础上,建立一种新型轴承的振动物理模型,运用振动力学的相关理论,建立其数学模型,通过数学模型,得出其固有振动的特征方程及特征解;由系统的固有振动方程得出伴随矩阵,由伴随矩阵求出其主振型,由主振型得出主质量矩阵,由主质量矩阵得出正则振型矩阵,最后得到该新型轴承系统的稳态响应表达式。通过稳态响应表达式分析系统的振型及振幅,并通过计算和试验分析了影响系统振幅的一些因素。研究结果表明:系统的主振型为内圈在x和y方向上作同为正向或同为负向振动和内圈在x和y方向上作正负相反方向振动两种,新型轴承产生共振的影响因素为内圈质量、滚子个数、内圈旋转位置、滚子的横向刚度、滑块与内外圈之间的油楔刚度,当这些因素以一定方式结合且其值等于激振频率时,系统将产生共振,新型轴承产生振动的振幅在内圈转动过程中无变化、与其滚子个数及滚子横向刚度大小成反比。

Vibration physical model of a new type of bearing is established on the basis of depth study for its structure and working mechanism. The mathematical model is established by vibration mechanics theory. The characteristic equation and characteristic solution of the inherent vibration is obtained by the mathematical model. The adjunctive matrix is obtained by the system＇s inherent vibration equation. The dominant mode of vibration is obtained by the adjunctive matrix. The main mass matrix is obtained by the dominant mode of vibration. The regular modal matrix is obtained by the main mass matrix. The steady-state response expression of the new bearing is obtained. The vibration modes and amplitude of the system are analyzed by steady-state response expression. And some of the factors that affect the system amplitude are analyzed by calculation and experiment. The results show that the system exist the two main modes that are the same vibration in positive or negative ofx and y directions and the opposite direction vibration in positive or negative of x and y directions, and the factors that make the new bearing resonance are inner quality and number of roller and inner rotary position and the stiffness of roller and the stiffness of the oil wedge between that exist between the slider and the rings, and the system will resonance when the factors combine in a certain way and its value is equal to the excitation frequency, and the vibration amplitude of the new bearing is unchanged during the rotation of the inner ring and is inversely proportional to the number of the roller and the roller radial direction stiffness.