变刚度印刷滚筒的空挡冲击动态特性研究

针对滚筒从印刷工作面转至空挡面时产生空挡冲击载荷而引起结构 振动的问题，分析了变刚度印刷滚筒空挡冲击的动态特性。先介绍变刚度印 刷滚筒结构的设计理念及其静态挠曲变形情况，再采用有限元方法对普通印 刷滚筒和变刚度印刷滚筒的模态特性、临界转速和空档冲击动态响应进行了 研究。结果表明：变刚度印刷滚筒保持轻量化的同时，其静态挠曲变形相较 于普通印刷滚筒有较大幅度下降，且在自由振动特性、响应位移振幅、振动 平衡位置和振动衰减速度方面更具优势，比普通印刷滚筒的结构更为稳定。

Research on the Neutral Impact Dynamical Characteristics of Variable Stiffness Printing Cylinder

Aimed at the problem of structural vibration caused by the neutral impact load as the cylinder being turned from the printing working surface to the neutral surface, the neutral impact dynamical characteristics of the variable stiffness printing cylinder were analyzed. The structure design concept of variable stiffness printing cylinder and its static deflection deformation were introduced, while the finite element method was used to study the modal characteristics, critical speed and neutral impact dynamic response of regular printing cylinder and variable stiffness printing cylinder. The results showed that the variable stiffness printing cylinder maintained light weight while its static flexural deformation was much lower than that of the ordinary printing cylinder, and it was advantageous in the aspects of free vibration characteristics, maximum amplitude of response displacement, vibration balance position and vibration attenuation speed, and more stable than the structure of regular printing cylinder.