Mechanism of Self-excited Vibration of a Web Supported by Air-turn Bar and Development of Vibration Suppression Mechanism

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This study deals with a theoretical stability analysis of a self-excited vibration generated in a web wrapped around an air-turn bar. Stability of the web wrapped around an air-turn bar is examined theoretically and experimentally. The instability condition of the system is shown as a function of air flow rate and tensile force. The instability mechanism of the self-excited vibration is discussed based on the theoretical model. Moreover, a semi-active control method to suppress the self-excited vibration of the web is proposed. It is experimentally shown that the self-excited vibration is effectively suppressed by the proposed semi-active control device. The suppression effect is clarified by the experiment.