Vertical nonlinear vibration analysis of cold rolling mill .
WEBDec 22, 2023 · Assuming that the vertical vibration occurs perpendicular to the sheet and the vibration of the upper and lower rolls is symmetrical about the center plane of the sheet [20, 22], the vertical nonlinear vibration model can be established as shown in Fig. equivalent mass m is concentrated on the theoretical rotation center of the upper work roll.