Vibrations of offset printing presses are serious problem, which cause many difficulties while printing and impair quality of the prints. The biggest problem lies in construction of printing unit. It mainly consists o...Vibrations of offset printing presses are serious problem, which cause many difficulties while printing and impair quality of the prints. The biggest problem lies in construction of printing unit. It mainly consists of three cylinders, but two of them are in a direct contact generate undesired vibrations. Construction of the cylinders makes that stiffness of the unit varies periodically while printing. In this paper model of offset printing unit is presented. The model is described by the system of two parametric differential equations. Computer simulations of the behaviour of the printing unit have been performed. Conditions in which parametric resonance appears are also appointed here.展开更多
The Shanghai Cotton Spinning Weaving Dveing and Printing United Corporation is an economic entity organized by 51 enterprises under three corporations controlled by the Shanghai Textile Bureau for the production of na...The Shanghai Cotton Spinning Weaving Dveing and Printing United Corporation is an economic entity organized by 51 enterprises under three corporations controlled by the Shanghai Textile Bureau for the production of namebrand products as its mainstay, dyeing, printing and foreign trade. With 1.2 million ring spindles,展开更多
文摘Vibrations of offset printing presses are serious problem, which cause many difficulties while printing and impair quality of the prints. The biggest problem lies in construction of printing unit. It mainly consists of three cylinders, but two of them are in a direct contact generate undesired vibrations. Construction of the cylinders makes that stiffness of the unit varies periodically while printing. In this paper model of offset printing unit is presented. The model is described by the system of two parametric differential equations. Computer simulations of the behaviour of the printing unit have been performed. Conditions in which parametric resonance appears are also appointed here.
文摘The Shanghai Cotton Spinning Weaving Dveing and Printing United Corporation is an economic entity organized by 51 enterprises under three corporations controlled by the Shanghai Textile Bureau for the production of namebrand products as its mainstay, dyeing, printing and foreign trade. With 1.2 million ring spindles,
