刷式密封接触动力学特性研究

Research on Structural Dynamic Characteristics of Brush Seals

对刷式密封的结构动力学特性进行了分析,从弹性理论出发,考虑轴颈和密封环之间的非线性摩擦力作用,建立了密封环与转子相互作用的非线性动力学方程,推出了密封环对转子的非线性支承刚度的近似表达式,这一支承刚度的导出为研究转子—密封—轴承系统的非线性动力学行为奠定了基础。最后用数值仿真方法验证了本文推导出的表达式的正确性。

In order to formulate a simple and exact expression for studying rotorbearingsealing system,the structural dynamic characteristics of brush seals were analyzed.On the basis of the elastic theory,this paper establishes the nonlinear dynamic equations describing the actions between the ring seal and the rotor,in which nonlinear friction between the ring seal and the rotor was considered.Then an approximate expression of the nonlinear supporting stiffness was derived,which provides the mathematical model and method for the study of nonlinear dynamics of rotorbearingsealing system.Finally the correctness of the expression was proved by using numerical simulation.